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LM2931CMX
Public Made by Adomby adom
Texas Instruments Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOIC-8. 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
markdownLM2931CMX
Texas Instruments · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOIC-8
LM2931CMX from Texas Instruments, in a SOIC-8. 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 | OUT | power_out | Regulated output of the adjustable LM2931; output voltage is set from 3V to 24V by an external resistor divider (R1/R2) connected between OUT and the ADJ pin. |
| 2 | GND | power_in | Ground pin, internally connected to pins 3, 6 and 7; the regulator ground-lead current equals the specified quiescent current (0.4 mA typ, 1 mA max at IO=10mA). |
| 3 | GND | power_in | Ground pin, internally connected to pins 2, 6 and 7; the regulator ground-lead current equals the specified quiescent current (0.4 mA typ, 1 mA max at IO=10mA). |
| 4 | ADJ | input | Adjust/feedback pin; an internal reference of 1.20V typ (1.08V-1.32V) is maintained between OUT and this pin, with an input bias current of about 1µA used together with R1 (27k recommended) and R2 to program VOUT. |
| 5 | ON/OFF | input | TTL-compatible shutdown control input; the regulator is ON when this pin is pulled below the on-threshold (2.0V typ, 1.2V max) and OFF when above the off-threshold (2.2V typ, 3.25V min), drawing up to 50µA max threshold current. |
| 6 | GND | power_in | Ground pin, internally connected to pins 2, 3 and 7; the regulator ground-lead current equals the specified quiescent current (0.4 mA typ, 1 mA max at IO=10mA). |
| 7 | GND | power_in | Ground pin, internally connected to pins 2, 3 and 6; the regulator ground-lead current equals the specified quiescent current (0.4 mA typ, 1 mA max at IO=10mA). |
| 8 | IN | power_in | Unregulated input supply pin; rated operating range up to 26V, with automatic shutdown protection against 60V load-dump overvoltage and -50V reverse-transient/-30V DC reverse-battery conditions. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
CAD (KiCad official)
- Symbol:
LM2931CMX - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files:
lm2931cmx-etched.step/lm2931cmx-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm2931cmx.step/lm2931cmx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (35 pp, sha256
45c959192188b8f1, retrieved 2026-09-24, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-sonnet-5(text+vision), consensusclaude-opus-4-8(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).