component
LM3404MRX
Public Made by Adomby adom
Texas Instruments LED Drivers, SOP-8-EP. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLM3404MRX
Texas Instruments · LED Drivers · SOP-8-EP
LM3404MRX from Texas Instruments, in a SOP-8-EP. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | SW | output | Switch pin connected to output inductor and Schottky diode. |
| 2 | BOOT | output | MOSFET drive bootstrap pin; connect 10-nF ceramic capacitor from this pin to SW. |
| 3 | DIM | input | PWM dimming input pin; logic-level PWM signal enables/disables power MOSFET and controls LED array light output. |
| 4 | GND | power_in | Ground pin connected to system ground. |
| 5 | CS | input | Current sense feedback pin; set LED array current by connecting resistor from this pin to ground. |
| 6 | RON | input | On-time control pin; resistor from this pin to VIN sets regulator controlled on-time. |
| 7 | VCC | power_out | Output of internal 7-V linear regulator; bypass to ground with minimum 0.1-µF ceramic capacitor (X5R or X7R dielectric). |
| 8 | VIN | power_in | Input voltage pin with nominal operating range 6 V to 42 V (LM3404) or 6 V to 75 V (LM3404HV). |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOP-8-EP |
| Category | LED Drivers |
| Pins | 9 |
CAD (KiCad official)
- Symbol:
LM3404MRX - Footprint:
Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm - 3D model: SOP-8-EP (KiCad packages3D, STEP)
- 3D model files:
lm3404mrx-etched.step/lm3404mrx-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm3404mrx.step/lm3404mrx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (47 pp, sha256
c30b6b258c57c07a, retrieved 2026-10-03, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).