component
LM3405AXMY
Public Made by Adomby adom
Texas Instruments LED Drivers, MSOP-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
markdownLM3405AXMY
Texas Instruments · LED Drivers · MSOP-8-EP
LM3405AXMY from Texas Instruments, in a MSOP-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 | FB | input | Feedback pin; connect to LED string cathode and external resistor to ground to set LED current. |
| 2 | GND | power_in | Signal and power ground pin; place feedback network resistor as close as possible to this pin. |
| 3 | NC | unconnected | No connection. |
| 4 | BOOST | output | Boost voltage output to drive NMOS switch; connect bootstrap capacitor between BOOST and SW pins. |
| 5 | SW | output | Switch pin; connect to inductor, catch diode, and bootstrap capacitor. |
| 6 | VIN | power_in | Input supply voltage from 3 V to 22 V; connect bypass capacitor locally to ground. |
| 7 | GND | power_in | Signal and power ground pin; place feedback network resistor as close as possible to this pin. |
| 8 | EN/DIM | input | Enable/dim control input; logic high enables operation, toggling controls LED brightness; do not allow to float or exceed VIN + 0.3 V. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | MSOP-8-EP |
| Category | LED Drivers |
| Pins | 9 |
CAD (KiCad official)
- Symbol:
LM3405AXMY - Footprint:
Package_SO:MSOP-8-1EP_3x3mm_P0.65mm_EP1.5x1.8mm - 3D model: MSOP-8-EP (KiCad packages3D, STEP)
- 3D model files:
lm3405axmy-etched.step/lm3405axmy-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm3405axmy.step/lm3405axmy.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (37 pp, sha256
6ffca81b353b1a67, retrieved 2026-10-07, 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).