component
LP3943ISQ
Public Made by Adomby adom
Texas Instruments LED Drivers, WQFN-24-EP(4x4). 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
markdownLP3943ISQ
Texas Instruments · LED Drivers · WQFN-24-EP(4x4)
LP3943ISQ from Texas Instruments, in a WQFN-24-EP(4x4). 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 | LED0 | output | Output of LED0 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 2 | LED1 | output | Output of LED1 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 3 | LED2 | output | Output of LED2 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 4 | LED3 | output | Output of LED3 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 5 | LED4 | output | Output of LED4 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 6 | LED5 | output | Output of LED5 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 7 | LED6 | output | Output of LED6 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 8 | LED7 | output | Output of LED7 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 9 | GND | power_in | Ground connection; internally tied to exposed thermal pad for mechanical and thermal performance. |
| 10 | LED8 | output | Output of LED8 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 11 | LED9 | output | Output of LED9 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 12 | LED10 | output | Output of LED10 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 13 | LED11 | output | Output of LED11 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 14 | LED12 | output | Output of LED12 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 15 | LED13 | output | Output of LED13 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 16 | LED14 | output | Output of LED14 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 17 | LED15 | output | Output of LED15 Driver; open-drain low-side switch with maximum 25mA sink current per pin. |
| 18 | RST | input | Active-low reset input; minimum 10ns pulse width resets device to default state. |
| 19 | SCL | input | I2C interface clock line input with maximum frequency 400kHz and input voltage range -0.5V to 5.5V. |
| 20 | SDA | bidirectional | I2C interface serial data line, open-drain bidirectional with output voltage 0 to 0.2VDD and sink current 3-6.5mA. |
| 21 | VDD | power_in | Power supply input with recommended operating range 2.3V to 5.5V and quiescent current 350-550µA. |
| 22 | A0 | input | I2C slave address selection input 0; input voltage range -0.5V to 5.5V. |
| 23 | A1 | input | I2C slave address selection input 1; input voltage range -0.5V to 5.5V. |
| 24 | A2 | input | I2C slave address selection input 2; input voltage range -0.5V to 5.5V. |
| 25 | Exposed Pad | power_in | Thermal pad internally tied to GND; must be soldered to printed circuit board for thermal and mechanical performance. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WQFN-24-EP(4x4) |
| Category | LED Drivers |
| Pins | 25 |
CAD (KiCad official)
- Symbol:
LP3943ISQ - Footprint:
Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm - 3D model: WQFN-24-EP(4x4) (KiCad packages3D, STEP)
- 3D model files:
lp3943isq-etched.step/lp3943isq-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lp3943isq.step/lp3943isq.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (26 pp, sha256
d6d0a0999dfdfaff, retrieved 2026-10-01, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).