Compact Camera Modules Built for Space Constrained Products
Why Compact Camera Modules Are Specified by Footprint First
In a space constrained product, the camera is rarely chosen on image quality first. It is chosen based on whether it fits. A compact camera module has to satisfy a board outline, an assembled height, a connector position, and a lens opening that were all fixed before the imaging requirement was settled, which is why a small form factor camera is normally specified 0from the mechanical drawing backwards rather than from the sensor forwards.
Vadzo Imaging builds compact camera modules on a single 38 x 38 mm board outline across the whole sensor range, from 2MP to 20MP, reducible to 32 x 32 mm where the enclosure demands it. Most modules deliver 1080p up to 60fps and full sensor resolution at 30fps, with the Falcon-822CRS reaching 4K at 30fps and the Bolt-2020CRH reaching up to 240fps at reduced resolution. A compact camera module for OEM integration therefore starts from a known footprint instead of a fresh mechanical problem for every sensor.
One Footprint Across the Sensor Range
38 x 38 mm as the Standard Board Outline
Every module in the Merlin, Bolt and Falcon ranges uses the same 38 x 38 mm camera module footprint. That matters more than it first appears. A design team can evaluate a 2MP global shutter part and ship a 20MP autofocus part in the same mechanical envelope, because the camera module size does not change with the sensor. Mounting holes, connector position, and optical center stay where the mechanical engineer put them, so a small camera module selected during prototyping does not force a bracket change at production.
Reducing to 32 x 32 mm
Where 38 x 38 mm is still too large, the board can be reduced to 32 x 32 mm as a customization. That takes the module to roughly 71 percent of its original board area without changing the sensor or the interface, which is often enough to clear a handheld enclosure or a sealed housing that a standard board will not fit. A mini camera module at 32 x 32 mm keeps the same imaging behavior as the 38 x 38 mm version, so optical and image quality validation already completed remains valid.
Why a Fixed Footprint Simplifies Mechanical Design
A miniature camera module range where every part has a different board outline forces a mechanical redesign each time the imaging requirement changes. A fixed outline removes that, and with it the most common late failure in a camera integration, which is discovering that the sensor upgrades the software team wants will not fit the bracket the mechanical team already tooled. A board level camera module on a consistent outline lets the mechanical and imaging decisions move independently.
Optics in a Compact Camera Module
S-Mount M12 as the Standard Holder
Every module in the range uses an S-mount lens holder, threaded M12 x 0.5. The barrel diameter and thread pitch keep the assembly small while still allowing a wide choice of focal lengths, so an M12 lens camera module can be fitted with a wide-angle optic for an aerial payload or a narrow field optic for precision measurement without changing the holder. That is why S-mount remains the default in space-constrained designs over the larger C-mount and CS-mount formats. Modules ship with a fixed focus lens fitted and factory calibrated unless a different optic is specified.
Lens Height and Total Track Length
Total track length, the distance from the front lens surface to the sensor plane, sets the minimum internal depth the enclosure has to provide. It is frequently the binding constraint rather than board area, because a low-profile camera module with a tall lens is no longer low-profile once assembled. Shorter focal lengths generally give shorter total track length, so field of view and enclosure depth are linked decisions that should be taken together rather than in sequence.
Autofocus and Optical Image Stabilization
Most modules in the range are fixed focus, which is mechanically simpler, more robust to vibration, and lower in cost wherever working distance is known and constant. Three modules add active focus. The Bolt-2020CRH and Falcon-2020CRH use an M12 VCM lens holder for integrated autofocus across variable working distances, and the Falcon-2020CRH exposes focus, exposure timing, gain, and dynamic ROI through the VISPA ARC SDK for software-controlled focus. The Bolt-1335CRO combines autofocus with optical image stabilization, which suits platforms that move while capturing. An autofocus camera module adds actuator height and power draw, so it is specified where working distance genuinely varies rather than by default.
Interfaces for Compact Camera Modules
Compact MIPI Camera for Board-Level Integration
A compact MIPI camera connects straight to the processor on the carrier board, which makes it the smallest and lowest power option available. A MIPI CSI-2 camera module carries no USB controller or Ethernet PHY, so board area and current draw are both lower than a cabled equivalent, and there is no bridge board or USB enumeration overhead in the video path. The Bolt-2020CRH outputs uncompressed data over four MIPI lanes with sub-10ms latency, and the Bolt-821CRS is available in both four-lane and two-lane configurations. The constraint is reach: MIPI CSI-2 was designed for short connections, and signal integrity degrades as cable length grows, so runs beyond a few tens of centimeters need a repeater or a different interface.
Compact USB Camera for Cabled Products
A compact USB camera enumerates as a standard UVC video device and needs no driver work on Windows, Linux, or Android. That makes a USB camera module the fastest route from evaluation to a working prototype, and the right answer wherever the camera is a separate assembly joined by a cable. The cost , compared to MIPI, is a higher component count on the board and a higher current draw, since the USB controller must be powered whether the camera is streaming or not.
Board-to-Board Connectors and Flex Cable
How the module joins the host affects assembled height as much as the board outline does. A board-to-board connector stacks the camera directly onto the host PCB with no cable at all, giving the shortest signal path and the smallest assembled volume, at the cost of fixing the camera position relative to the host. A flex cable camera module lets the sensor board sit at an angle or a distance from the host, which is what makes tight enclosures and non-planar mounting practical. Connector type, cable length, and cable orientation are all specified per project.
Merlin Compact Camera Modules, USB 2.0
The Merlin range covers compact USB camera options over USB 2.0 Micro-B for cost-sensitive designs streaming 1080p and 720p. The Merlin-290CRS and Merlin-291CRS use Sony IMX290 and IMX291 sensors, which are the low light parts in this range.
Bolt Compact Camera Modules, MIPI CSI-2
The Bolt range is the compact MIPI camera family, intended for board-level integration where footprint and power are the binding constraints. It is the widest of the three ranges, covering 2MP to 20MP with global shutter, monochrome, HDR, autofocus, and optical image stabilization options on the same 38 x 38 mm outline.
Camera Module | Sensor | Resolution | Shutter | Buy Now |
|---|---|---|---|---|
Bolt-234CGS | onsemi AR0234 | 2MP | Global | |
Bolt-234MGS | onsemi AR0234 | 2MP | Global | |
Bolt-235CGS | onsemi AR0235 | 2.3MP | Global | |
Bolt-246CRS | onsemi AR0246 | 2MP | Rolling | |
Bolt-521CRS | onsemi AR0521 | 5MP | Rolling | |
Bolt-522CRS | onsemi AR0522 | 5MP | Rolling | |
Bolt-544CRS | onsemi AR0544 | 5MP | Rolling | |
Bolt-821CRS | onsemi AR0821 | 8MP | Rolling | |
Bolt-822CRS | onsemi AR0822 | 8MP | Rolling | |
Bolt-830MRS | onsemi AR0830 | 8MP | Rolling | |
Bolt-900MGS | Sony IMX900 | 3MP | Global | |
Bolt-1335CRS | onsemi AR1335 | 13MP | Rolling | |
Bolt-1335MRS | onsemi AR1335 | 13MP | Rolling | |
Bolt-1335CRO | onsemi AR1335 | 13MP | Rolling | |
Bolt-2020CRS | onsemi AR2020 | 20MP | Rolling | |
Bolt-2020CRH | onsemi AR2020 | 20MP | Rolling |
Falcon Compact Camera Modules, USB 3.2 Gen 1
The Falcon range covers compact USB camera options over USB 3.2 Gen 1, where the available bandwidth supports higher-resolution and higher-frame-rate output than USB 2.0 allows, on the same 38 x 38 mm board. Every Falcon module is a UVC device, so no driver work is required on the host.
Camera Module | Sensor | Resolution | Shutter | Buy Now |
|---|---|---|---|---|
Falcon-235MGS | onsemi AR0235 | 2.3MP | Global | |
Falcon-235CGS | onsemi AR0235 | 2.3MP | Global | |
Falcon-234MGS | onsemi AR0234 | 2MP | Global | |
Falcon-246CRS | onsemi AR0246 | 2MP | Rolling | |
Falcon-521CRS | onsemi AR0521 | 5MP | Rolling | |
Falcon-522CRS | onsemi AR0522 | 5MP | Rolling | |
Falcon-544CRS | onsemi AR0544 | 5MP | Rolling | |
Falcon-544MRS | onsemi AR0544 | 5MP | Rolling | |
Falcon-568MGS | Sony IMX568 | 5.1MP | Global | |
Falcon-821CRS | onsemi AR0821 | 8MP | Rolling | |
Falcon-822CRS | onsemi AR0822 | 8MP | Rolling | |
Falcon-1335CRS | onsemi AR1335 | 13MP | Rolling | |
Falcon-1335MRS | onsemi AR1335 | 13MP | Rolling | |
Falcon-2020CRH | onsemi AR2020 | 20MP | Rolling | |
Falcon-2020MRS | onsemi AR2020 | 20MP | Rolling |
Wake-on-Motion and Low Power Operation
Compact usually means battery-powered, and in a battery-powered product the dominant power cost is not capture but idle. A camera that streams continuously so the host can evaluate and discard frames spends most of its energy on nothing. Wake-on-Motion moves that decision into the sensor: the sensor monitors the scene in a super low power state and wakes the host only when pixel level motion crosses a configurable threshold.
Six modules in the range carry it. The Bolt-246CRS and Falcon-246CRS on the onsemi AR0246, the Bolt-544CRS on the AR0544, the Bolt-822CRS and Falcon-822CRS on the AR0822, and the Bolt-2020CRH on the AR2020. For a wearable camera module, a smart doorbell, a remote traffic node, or any solar- or battery-powered installation, removing idle draw is what determines the interval between maintenance visits. It is the single most consequential feature in this range for space-constrained products, because a smaller enclosure also means a smaller battery.
Sensor Options in a Compact Footprint
Because the footprint is constant, sensor choice can follow the scene rather than the mechanical envelope.
Global Shutter in a Small Module
A global shutter camera module exposes every row of the sensor simultaneously, which removes the skew a rolling shutter produces on a moving subject. In a compact product, this matters more than usual, because handheld and vehicle-mounted devices move even when the subject does not. The global shutter options are the Bolt-234CGS, Bolt-234MGS, Bolt-235CGS, Bolt-900MGS, Falcon-235MGS, Falcon-235CGS, Falcon-234MGS and Falcon-568MGS.
Monochrome Options
Removing the color filter array raises effective sensitivity and simplifies processing wherever color carries no information, which covers most measurement, positioning, and presence detection work. The monochrome parts are the Bolt-234MGS, Bolt-830MRS, Bolt-900MGS, Bolt-1335MRS, Falcon-235MGS, Falcon-234MGS, Falcon-544MRS, Falcon-568MGS, Falcon-1335MRS and Falcon-2020MRS.
HDR and Dynamic Range
An HDR camera module holds bright and dark regions in the same frame, which matters in compact products that cannot control their own lighting. The implementations differ by sensor, and the figures are worth comparing rather than treating them as equivalent. The Bolt-246CRS and Falcon-246CRS provide on-sensor eHDR at 120 dB with Adaptive Local Tone Mapping, plus line-interleaved HDR and enhanced dynamic range modes. The Bolt-821CRS and Falcon-821CRS provide embedded HDR above 140 dB with eHDR reconstruction and flexible exposure ratio control, the widest dynamic range in the range. The Bolt-822CRS and Falcon-822CRS provide line-interleaved HDR and enhanced dynamic range with intelligent linearization that limits motion artefacts and LED flicker, which is what makes them suitable for vehicle and outdoor use. The Bolt-2020CRH provides in-sensor line-interleaved HDR up to 100 dB without motion artefacts, and 73 dB enhanced dynamic range in single-exposure mode where multi-frame HDR is unnecessary.
Low-Light and NIR Sensitivity
A low-light camera module in this range is built on the Sony IMX290 or IMX291 in the Merlin-290CRS and Merlin-291CRS, where backside illumination and larger pixels recover usable detail under limited illumination. The Bolt-544CRS on the onsemi AR0544 also delivers strong low-light color sensitivity from 1.4-micron pixels while drawing very little power. Where illumination is supplied rather than ambient, the Bolt-2020CRH adds enhanced near-infrared sensitivity at 850 nm and 940 nm, which allows a high-resolution camera module to work with invisible IR illumination in darkness.
Thermal Management in a Sealed Enclosure
A smaller module in sealed housing has less surface area to shed heat through, and a compact camera module sitting behind a window in direct sun accumulates more heat. Sensor noise rises with temperature, so a module that meets its image specification on an open bench can miss it inside the product. Thermal behavior should be validated in the actual enclosure rather than on the evaluation board, and where the host runs inference alongside the camera, the combined load needs to be budgeted together. A board-to-board mounting arrangement conducts heat into the host PCB, which helps or hurts depending on what else that board is doing. Wake-on-Motion reduces average thermal load as well as average power, since a sensor in super low power mode generates very little heat.
Host Platform and Driver Support
A compact camera module only earns its place if the host can talk to it immediately. Falcon and Merlin modules are UVC devices and need no driver work on Windows, Linux, or Android. Bolt modules ship with a native Linux V4L2 driver and ready-to-use device tree overlays, validated on Raspberry Pi 4 and 5, the NVIDIA Jetson Orin series including Orin Nano, Orin NX, and Orin AGX, NXP i.MX8M Plus and Rockchip platforms, with no proprietary SDK or binary blob required. Integration documentation and sample code cover resolution switching, Wake-on-Motion configuration, and auto exposure control. For platforms outside the validated list, driver porting is supported. Driver availability should be confirmed against the exact kernel version a project has frozen, since a nominally supported platform may not be supported on that specific kernel.
Applications for Compact Camera Modules
Handheld and Wearable Devices
A handheld device camera has to survive being moved while it captures, which points to a global shutter, and it has to fit an enclosure sized for a hand rather than a rack. A wearable camera module adds a power constraint on top, since battery capacity scales with available space, making the MIPI options and Wake-on-Motion parts preferable to a continuously streaming cabled module. The Bolt-246CRS and Falcon-246CRS are specified for wearable and facial recognition use for that reason.
Medical and Endoscope Imaging
A medical camera module is constrained by sterilization, biocompatibility, and enclosure volume in addition to image quality. An endoscope camera module represents the extreme end of that requirement, where module diameter rather than board area is the limit and specialized packaging is needed. For benchtop diagnostic and laboratory instruments, the 32 x 32 mm option is usually sufficient, and the Bolt-544CRS is used in diagnostic and lab automation work where steady auto exposure handles reflections from wet tissue or glass slides. The Falcon-2020CRH is specified for digital pathology and microscopy, where software-controlled focus through the VISPA ARC SDK matters more than fixed calibration.
Drones and Mobile Robotics
A drone camera module is specified on mass and power before anything else, and it operates on a platform that vibrates and moves continuously. That normally points to a global shutter and fixed focus, but where a UAV has to hold focus across changing ground distance, the Bolt-1335CRO adds autofocus with optical image stabilization. Wake-on-Motion lets a module sleep during transit and wake only over the target area. Autonomous guided vehicles and mobile robots share the motion requirement with more thermal and power headroom available.
Access Control and Kiosk Terminals
Access control readers and kiosk terminals need a small module behind a fixed window, often facing a doorway or a bright background, which is where an HDR sensor earns its cost. Working distance is fixed in these installations, so fixed focus is appropriate, and autofocus adds size and cost for no benefit. Wake-on-Motion allows a kiosk to bring its display and host out of standby only when a user approaches.
Customizing a Compact Camera Module
Reducing the board from 38 x 38 mm to 32 x 32 mm is the most common customization on a compact camera module for OEM integration, but it is rarely the only one. Lens selection and field of view, IR cut or IR pass filter choice, NIR-optimized optics, lens holder height, connector type, cable length and orientation, and ISP tuning for the target scene are all specified per project. A VCM lens holder can be added for software-controlled focus where a fixed-focus part would otherwise be used. Because Vadzo Imaging designs the boards and firmware rather than reselling finished modules, the mechanical outline and the imaging behavior can both be changed with the sensor core unchanged, which is what allows a module to be matched to an existing enclosure rather than an enclosure redesigned around a module.
Choosing a Compact Camera Module: Size, Optics, and Interface
Five questions in this order will narrow the range quickly.
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Does the 38 x 38 mm fit, or is the 32 x 32 mm reduction required? This is the first filter, and it is mechanical rather than optical.
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What total track length can the enclosure depth accommodate? Lens height frequently constrains the design more than board area, and it determines the available field of view.
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Does the camera sit on the host PCB or at the end of a cable? Board-level integration points at MIPI
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Is the product battery powered? If so, Wake-on-Motion and an MIPI interface will do more for runtime than any other choice on the list.
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Does anything move during exposure? If the subject or the product moves, a global shutter is required regardless of resolution, and if working distance also varies, autofocus is needed on top.
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Frequently Asked Questions
1.What is a compact camera module?
A compact camera module is a small camera board designed to be built into a space-constrained product rather than used as a standalone camera. It combines an image sensor, a lens holder, and an interface on a single board sized to fit inside a host enclosure. A small form factor camera is specified by board outline, assembled height, and connector position alongside its image specification, because in a compact product the mechanical constraints are usually fixed before the imaging requirements are.
2.How small can a compact camera module be?
Vadzo compact camera modules use a standard 38 x 38 mm camera module footprint across the entire sensor range, from 2MP to 20MP, and can be reduced to 32 x 32 mm as a customization. That reduction takes the board to roughly 71 percent of its original area without changing the sensor or the interface. Because camera module size is constant across the range, a high-resolution camera module occupies the same board area as a 2MP part.
3.What is the difference between a compact camera module and a standard camera module?
A standard camera module is specified primarily based on imaging capability, with mechanical format following suit. A compact form factor camera reverses this order: board outline, assembled height, connector position, and lens opening are viewed as hard limits, and the sensor is chosen based on what fits. Compact modules also employ S-mount optics rather than bigger C-mount formats and provide board-to-board or flex cable connections rather than cabled assemblies.
4.Which interface is best for a compact camera module?
A MIPI CSI-2 camera module is the smallest and lowest power option because it connects directly to the processor with no USB controller on the board and no bridge conversion in the video path, but it requires board-level integration with a V4L2 driver and device tree overlay, and it is limited to short cable runs. A USB camera module needs no driver work and supports cable runs of a few meters, at the cost of more board area and higher current draw. For battery-powered board-level designs, MIPI is usually correct.
5.Can a compact camera module have auto-focus or a global shutter?
Both, though not on the same module in this range. Global shutter camera module options include the Bolt-234CGS, Bolt-235CGS, Bolt-900MGS, Falcon-235CGS, Falcon-234MGS, and Falcon-568MGS. Autofocus is available on the Bolt-2020CRH and Falcon-2020CRH through an M12 VCM lens holder, and on the Bolt-1335CRO with optical image stabilization added. An autofocus camera module adds actuator height and power draw, so it is specified where working distance varies during operation and avoided where working distance is fixed. A VCM holder can also be added to a fixed-focus part as a customization.
6.What lens formats are used in compact camera modules?
S-mount, threaded M12 x 0.5, is the standard format across the whole range. An M12 lens camera module keeps barrel diameter and assembled height small while still offering a wide choice of focal lengths, which is why S-mount is preferred over C-mount and CS-mount in compact designs. The figure to check against the enclosure is total track length, the distance from the front lens surface to the sensor plane, since that sets the minimum internal depth the product has to provide. Wide-angle, narrow-field, and NIR-optimized optics are all available.
7.How do I choose a compact camera module for OEM integration?
Start with the mechanical envelope. Confirm whether 38 x 38 mm fits or the 32 x 32 mm reduction is needed, then check the total track length of the intended lens against the available enclosure depth. Decide whether the module mounts on the host PCB, which points at MIPI, or sits at the end of a cable, which points at USB. If the product runs on a battery, prioritize Wake-on-Motion. Then select the sensor: global shutter if anything moves during exposure, monochrome where color carries no information, HDR where lighting cannot be controlled, and autofocus only where working distance varies. Validate thermal behavior inside the real enclosure rather than on the evaluation board.