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LM2931AD50R

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by Ray

STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentpower management (pmic)lm2931ad50r
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Contents

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LM2931AD50R

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOIC-8

LM2931AD50R from STMicroelectronics, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VOUT power_out Regulated 5.0 V output. Typical 5.0 V (min 4.75 V, max 5.25 V) at IO = 100 mA over the full VI = 6 to 26 V and TJ = -40 to 125 °C range. Requires a ≥100 µF output capacitor for stability.
2 GND power_in Device ground / reference return.
3 GND power_in Device ground / reference return (tied internally to the other GND pins; multiple GND pins aid heat sinking on SO-8).
4 NC unconnected Not connected on the fixed-output version (LM2931AD50R). This pin serves as the ADJ feedback input only on the adjustable (LM2931D-R) variant; leave floating on this part.
5 INHIBIT input Active-high shutdown / inhibit logic input. Regulator is enabled when VINH < 1.2 V (VIL) and disabled when VINH > 3.25 V (VIH). Inhibit input current IINH ≈ 22 µA typ (50 µA max) at VINH = 2.5 V. Absolute maximum inhibit input voltage is 40 V.
6 GND power_in Device ground / reference return (tied internally to the other GND pins).
7 GND power_in Device ground / reference return (tied internally to the other GND pins).
8 VIN power_in Unregulated supply input. Recommended operating range 6 V to 26 V (max operating 26 V min); tolerates transient input up to 60 V (T < 100 ms) and reverse polarity down to -15 V DC / -50 V transient. Decouple with a 0.1 µF input capacitor. Absolute maximum DC input voltage 40 V.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOIC-8
Category Power Management (PMIC)
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • LM2931AD50R
  • LM2931AD33R
  • LM2931D-R
  • LM2931ADT50R
  • LM2931ADT50RY
  • LM2931ADT33RY
  • LM2931AZ50R

CAD (KiCad official)

  • Symbol: LM2931AD50R
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (24 pp, sha256 07bd8d19d77c6060, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF