3.6mm vs 3.9mm Endoscope Camera Modules: Which Diameter Fits Your OEM Device?

Quick Answer

The difference between 3.6mm and 3.9mm may look small, but in compact endoscope devices, 0.3mm can affect mechanical clearance, shell design and product choice.

Choose 3.6mm when the device has a tighter entry channel and the smaller outer diameter creates real mechanical value.

Choose 3.9mm when the device has enough space and the project benefits from a wider range of configurations such as different sensors, AV or USB output, Type-C, integrated or separated design, waterproof structures or higher-resolution options.

The correct decision is therefore not:

“Which diameter is better?”

It is:

“Does reducing the camera from 3.9mm to 3.6mm solve a real mechanical problem?”

Current Product Flexibility

3.6mm product directions include:

• GC030A;

• OV9734;

• OH01A10 720P60;

• integrated and separated structures;

• USB / Type-C-related options.

3.9mm product directions are broader and include:

• OV6922 AV;

• GC030A;

• OV9734;

• OH01A10 720P60;

• OV02C10 2MP;

• Type-C;

• integrated;

• separated;

• long-shell;

• waterproof;

• dimming-related designs.

3.6mm vs 3.9mm

When 3.6mm Is the Better Choice

Use 3.6mm when:

• the insertion channel is close to the mechanical limit;

• saving 0.3mm improves assembly clearance;

• the selected sensor and resolution already meet the device requirement;

• additional shell or optical options are not required.

When 3.9mm Is the Better Choice

Use 3.9mm when:

• the extra 0.3mm does not create a mechanical problem;

• the project needs more sensor or structure options;

• AV output is required;

• Type-C, Steel Shell, waterproof or integrated configurations are being evaluated;

• higher image-detail options are needed.

Do Not Compare Diameter Alone

Also compare:

• finished head size;

• camera-head length;

• FOV;

• working distance;

• LEDs;

• cable;

• shell;

• connector;

• host;

• resolution;

• frame rate.

A 3.6mm bare module can still become larger after enclosure or protective structures are added.

RFQ Checklist

Provide:

• maximum finished camera diameter;

• maximum front-section length;

• target resolution;

• frame rate;

• working distance;

• FOV;

• interface;

• shell/protection;

• LED requirement;

• cable length.

FAQ

Is 3.6mm significantly smaller than 3.9mm?

Mechanically, 0.3mm can be important in very narrow channels, but it may have little value if the device already has sufficient space.

Does 3.9mm provide more product choices?

In the current product range, 3.9mm supports a broader combination of sensors, interfaces and structures.

Can both diameters support USB?

Yes, both product directions include USB configurations.

Can both support 60fps?

OH01A10 720P60 directions are available in both diameter ranges.

Is 3.9mm better for industrial inspection?

Not automatically. The final access diameter, viewing direction, shell and environment determine the better option.

Can I customize the connector or cable?

Connector and cable configurations can be evaluated according to the project.

CTA

Send your maximum probe diameter, camera-head length, image requirement and interface so SincereFull can help compare the 3.6mm and 3.9mm product directions.