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Product Information
This 5V 3mm COB LED strip light delivers continuous, dot-free linear illumination across an ultra-narrow 3mm printed circuit board. Engineered with 400 chips per meter and consuming 6W per meter, this flexible ribbon is tailored for micro-illumination tasks where wide PCB boards cannot physically fit. As a specialized item in our micro thin 3mm LED strip catalog, it runs on low-voltage DC 5V, making it fully compatible with USB ports, power banks, and portable battery packs. White color options deliver high color fidelity with a color rendering index exceeding Ra 90. Because 5V circuits encounter voltage drop across longer runs, single-ended power feed is designed for segments around 1 meter.
Key Product Features
Ultra-Narrow 3mm PCB Profile
At only 3mm wide, this miniature circuit board slides into narrow channels, gaps, scale models, and small DIY enclosures where standard strips cannot fit.
High-Density Dotless Illumination
With 400 LEDs packed per meter under a uniform coating, this COB design provides smooth, hotspot-free linear output without diffuser covers.
Micro 10mm Cut Intervals
Marked black lines every 10mm (0.39 inches) allow precise tailoring for miniature craftwork, scale architectural models, and drone frames.
True Ra > 90 Color Accuracy
White light variants deliver true-to-life color rendering with Ra greater than 90, preventing color distortion in display cases and miniature modeling.
Safe 5V DC Operating Voltage
The low 5V DC input pairs seamlessly with DC 5V LED strip lights setups, microcontrollers, lithium battery packs, and USB power sources.
Wide Color Palette Availability
Available in warm white 3000K, neutral white 4000K, cool white 6500K, as well as saturated red, green, blue, yellow, pink, and ice blue.
Technical Performance and Circuit Design
- Continuous chip-on-board packaging produces a 180-degree beam angle with zero visible diode spotting even at zero clearance from surfaces.
- Precision cut marks spaced at 10mm allow exact dimension fitting for compact electronic enclosures and hobbyist projects.
- Operates on regulated 5V DC; pairs directly with a compact 5V plastic shell power adapter for benchtop and small display projects.
- For multi-segment installations requiring dedicated driver capacity, connect runs using an industrial-grade 5V Mean Well power supply.
- Due to physical copper trace limitations on a 3mm width, DC 5V suffers noticeable voltage drop over long continuous runs; segments should receive direct power feeds every 1 meter.
Product Specifications
| Parameter | Details |
|---|---|
| Product Model (SKU) | FSLCOB-5V-400W3 |
| Operating Voltage | DC 5V |
| Power Consumption | 6W per meter (approx. 30W per 5m spool) |
| PCB Width | 3mm (0.12 in) |
| LED Density | 400 LEDs/m (2000 LEDs per 5m spool) |
| LED Technology | Chip-on-Board (COB) linear phosphor |
| Color Rendering Index (CRI) | Ra > 90 (for white CCT options) |
| Available Color Temperatures | 3000K, 4000K, 6500K |
| Available Monochromatic Colors | Red, Green, Blue, Yellow, Pink, Ice Blue |
| Cut Interval | 10mm (0.39 in) |
| Spool Length | 5 meters (16.4 feet) |
| Beam Angle | 180 degrees |
| Ingress Protection Rating | IP20, IP67 |
| Operating Temperature | -20 deg C to +45 deg C |
| Recommended Max Single-End Run | 1.0 meter (due to 5V DC line resistance) |
Application Scenarios
How to Install & Use This LED Strip
- Measure your installation area and cut the LED strip strictly along the marked cutting lines spaced every 10mm.
- Connect the lead wires to a regulated 5V DC power source or 5V PWM dimmer and verify lighting operation.
⚠ Precautions
- Do not power the entire 5m spool from one end; severe voltage drop will cause noticeable dimming past 1 meter.
- Even when feeding power to both ends of a full 5m spool, the center section will exhibit visible voltage sag due to the narrow 3mm copper trace resistance; cut the LED strip into targeted lengths and feed power separately.
What's in the Box
- ✓1 x 5-meter (16.4ft) spool of 3mm COB LED Strip Light (DC 5V, 400 LEDs/m)
- ✓2 x Pre-attached 2-wire power lead (red/black) on the spool reel
Frequently Asked Questions
Q: how to connect cob led strip
A: Because the PCB is only 3mm wide, standard clip-on solderless connectors are generally too wide. We recommend direct soldering of 22-24 AWG wires to the copper solder pads on the cut lines for a secure electrical connection.
Q: Why does a 5m reel experience voltage drop even with dual-ended power?
A: Because the copper PCB is only 3mm wide, electrical resistance along the traces is higher than on standard 8mm or 10mm strips. Powering both ends of a full 5m run still leaves the 2.5m midpoint noticeably dimmer, which is why we recommend cutting the strip and feeding power to segments of approximately 1 meter.
Q: Can I run this strip directly from a 5V USB port or power bank?
A: Yes. At 6W per meter, a 1-meter segment draws approximately 1.2A at 5V DC, which falls comfortably within the output range of standard 5V 2A USB power banks and wall chargers.
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Downloads
Files for FSLCOB-5V-400W3Images
These images were taken with Canon EOS 5D Mark IV and the studio light source is provided by Ra 98's full spectrum LED strip to realistically reproduce the colors of the item itself. All copyrights are created by the superlightingled team, please feel free to browse and download if you are a registered user!
LED Strip Light Guide
Common questions about this type of product, answered against this model’s own options. For full figures see the specification above or the spec sheet for this model.
