1. What is the SF-SJN345 D4.5?
The SF-SJN345 D4.5 is an integrated USB endoscope camera module designed for basic close-range visual inspection.
It uses the BF20A6 sensor and supports YUV 640×480@30fps output.
2. What is the main positioning of this model?
It is best positioned as a compact USB imaging module for basic close-range observation.
It is suitable when the user needs practical visual confirmation rather than high-resolution image analysis.
3. What is the camera diameter?
The catalog lists D4.5.
Customers should distinguish the module diameter from the final complete probe diameter after housing and mechanical integration.
4. What sensor does this model use?
The catalog lists the BF20A6 sensor.
5. What is the pixel class?
The module is listed as 0.3MP.
6. What is the maximum output?
The module supports 640×480@30fps.
7. What image format does it support?
The catalog lists YUV output.
MJPEG is not listed for this model.
8. Is 640×480 enough for an inspection device?
It depends on the inspection task.
It may be enough for:
Blockage checking
Component position confirmation
Foreign-object observation
Basic cavity viewing
Obvious surface condition checking
It may not be enough for fine defects, measurement, AI recognition or high-resolution documentation.
9. Is 0.3MP too low for modern inspection devices?
Not automatically.
The correct imaging level depends on what the user must see.
For basic visual confirmation, a lower-resolution module can still be suitable.
For small defect analysis or high-detail recording, a higher-resolution module should be considered.
10. Does the module support 30fps?
Yes.
The listed output is 640×480@30fps.
11. Is this model suitable for smooth high-speed inspection?
It is designed for basic 30fps visualization.
Customers with high-speed motion or high-frame-rate requirements should evaluate another module.
12. Is this an integrated or separate-type module?
The catalog lists it as an ALL integrated-type module.
It should be evaluated differently from a separate-type camera head and remote main board structure.
13. Does this model have built-in LEDs?
Yes.
The catalog lists 6pcs LEDs.
14. What LED package size is used?
The current catalog confirms 6 LEDs but does not clearly specify the LED package size for this model.
Customers who need exact LED structural details should confirm them during project evaluation.
15. Can the LED brightness be adjusted?
No.
The catalog marks dimming as No.
16. When is fixed LED brightness acceptable?
It may be suitable when:
Working distance is stable
The target is not highly reflective
The lighting environment is consistent
The user does not need brightness adjustment
17. When may fixed LED brightness cause problems?
Potential issues may occur with:
Polished metal
Wet surfaces
Glossy plastic
Curved reflective objects
Strongly reflective internal walls
Customers should test the real target material.
18. What is the FOV?
The catalog lists a 72° FOV.
19. Is 72° considered a wide-angle view?
It is more focused than many 100° to 140° endoscope camera modules.
It can be useful when the application needs local target observation rather than maximum surrounding scene coverage.
20. What is the advantage of a more focused FOV?
A more focused FOV can help the target occupy a larger portion of the image than with an extremely wide-angle view, depending on working distance and optical configuration.
The final result should be confirmed by real-scene testing.
21. Is 72° suitable for cavity navigation?
It may be suitable in some devices, but customers who need maximum surrounding context for navigation may prefer a wider-FOV module.
The decision depends on cavity size and operator workflow.
22. What is the focusing range?
The catalog lists 20–60mm.
23. Is it suitable for viewing closer than 20mm?
The listed focusing range begins at 20mm.
If the real target is normally closer than this, another optical configuration or camera module should be evaluated.
24. Is it suitable for viewing beyond 60mm?
The listed range ends at 60mm.
If the application normally requires longer-distance viewing, another module may be more suitable.
25. What should I do before selecting a sample?
Measure:
Minimum working distance
Typical working distance
Maximum working distance
Target size
Smallest feature that must be visible
These factors help determine whether the module fits the task.
26. What lens material does it use?
The catalog lists a plastic lens.
27. What is the front length?
The current catalog does not specify the front length for this model.
Customers who need exact mechanical dimensions should confirm them before final device design.
28. Does this model support IP67?
The current catalog does not provide a confirmed IP67 specification for this model.
Customers should not position it as an IP67 module unless separate project documentation confirms that requirement.
29. Can it be used in wet environments?
Waterproof use should not be assumed from the current catalog information.
Customers with wet-environment requirements should either confirm an appropriate sealed design or evaluate a model with confirmed IP67 support.
30. What is the standard cable length?
The current catalog does not specify a standard cable length for this model.
Cable requirements should be confirmed during project communication.
31. What is the maximum cable length?
The current catalog does not specify a maximum cable length.
Customers with long-cable requirements should provide the target length before sample evaluation.
32. What is the main board size?
The current catalog does not specify a main board size for this model.
Mechanical integration data should be confirmed before final housing design.
33. What is the front connector?
The current catalog does not specify the front connector.
Customers who need exact wiring or connector information should confirm it before product integration.
34. What connection type is listed on the host side?
The catalog lists Type-A.
Actual host compatibility should still be tested with the intended system.
35. Can it connect directly to a computer?
It is a USB module with Type-A connection listed, but compatibility should still be tested with the actual host system and software environment.
Connector form alone should not be treated as a universal compatibility guarantee.
36. Can it connect directly to a Type-C phone?
The catalog lists Type-A, not Type-C.
Phone integration should not be assumed and depends on host USB support, adapters, software and the complete system architecture.
37. Is this a finished endoscope device?
No.
It is a camera module for OEM integration.
Customers still need to evaluate housing, cable, mechanical protection, host compatibility and environmental requirements.
38. Is this model suitable for industrial inspection?
It can be evaluated for basic industrial visual inspection tasks such as:
Equipment cavity observation
Machinery internal checking
Component position confirmation
Maintenance inspection
Foreign-object checking
The image requirement should be confirmed according to the real task.
39. Is it suitable for automotive maintenance?
It can be evaluated for basic automotive service inspection where the D4.5 diameter, 20–60mm working distance and image detail match the target.
Reflective metal surfaces should be tested with the fixed LED lighting.
40. Is it suitable for pipe inspection?
It may be evaluated for basic dry tube or cavity observation.
Customers requiring waterproof use or longer observation distance should evaluate these requirements separately.
41. Is this model suitable for medical diagnostic imaging?
It should not be positioned as a high-detail diagnostic imaging module.
Its confirmed specifications are better suited to basic visual observation.
Medical device projects require application-specific image evaluation and complete-device compliance planning.
42. Is it suitable for AI inspection?
It should not automatically be selected for AI inspection based on basic visual performance.
AI suitability depends on target size, image detail, lighting consistency and algorithm requirements.
For many AI inspection tasks, a higher-resolution and more controlled imaging platform may be required.
43. Can it detect small cracks?
That depends on crack size, working distance, contrast, lighting and required confidence.
Customers should not assume fine-crack capability from the current 640×480 specification.
A higher-detail camera module may be more appropriate.
44. What is the most important selection factor for this model?
The most important factors are:
Whether 640×480 provides enough information
Whether the target stays within 20–60mm
Whether 72° FOV matches the inspection area
Whether fixed LED lighting is acceptable
Whether the USB host environment is suitable
45. What should customers test after receiving a sample?
Test:
Image clarity at real working distance
Visibility of the actual target
LED brightness
Surface reflection
72° FOV coverage
30fps live viewing
Host compatibility
Mechanical fit
Environmental requirements
46. What is the most common mistake when choosing this model?
The most common mistake is judging the model only by its 0.3MP resolution.
Customers should instead determine whether the image can answer the actual inspection question.
A second common mistake is ignoring the 20–60mm working distance.
47. When should I choose a higher-resolution module?
Choose a higher-resolution model when the application needs:
Small defect visibility
Fine surface detail
Zooming
High-resolution documentation
OCR
AI recognition
Measurement
Detailed medical visualization
48. When is this model the better choice?
It can be the better choice when:
The task is basic visual confirmation
The target is relatively large
The viewing distance is 20–60mm
A 72° FOV is appropriate
Built-in fixed lighting is acceptable
The product uses a compatible USB integration path
49. Can SincereFull evaluate another model if this one does not fit?
Yes.
Alternative module selection can be evaluated according to:
Diameter
Resolution
Working distance
FOV
Lighting
Waterproof requirement
Interface
Cable requirements
Mechanical structure
The final recommendation should be based on the complete device requirement.
50. What information should I provide before requesting a quotation?
Please provide:
Application scenario
What the user needs to see
Smallest target feature
Required diameter
Actual working distance
Target material
FOV requirement
Lighting condition
Waterproof requirement
Host system
Connection requirement
Sample quantity
Estimated production volume
Mechanical constraints
51. How do I know whether SF-SJN345 D4.5 is right for my project?
Choose this model when the project needs:
D4.5 camera diameter
USB output
BF20A6 sensor platform
640×480@30fps YUV image
Built-in 6pcs LEDs
72° FOV
20–60mm working distance
Integrated camera structure
Basic close-range visual inspection
Choose another model when the project requires higher resolution, wider FOV, very close focus, longer viewing distance, dimming or confirmed waterproof support.
Key Takeaway
The SF-SJN345 D4.5 is a compact USB endoscope camera module for straightforward close-range visual inspection.
Its suitability should be judged by one practical question:
Can the operator clearly see the information needed to make the required inspection decision?
Before sample approval, customers should verify actual working distance, target size, 72° FOV, LED reflection, host compatibility and environmental requirements in the real device environment.
