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L4940D2T12-TR

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by Ray

STMicroelectronics Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-263-2. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentpower management (pmic)l4940d2t12-tr
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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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L4940D2T12-TR

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-263-2

L4940D2T12-TR from STMicroelectronics, in a TO-263-2. 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 INPUT power_in Unregulated positive input supply. Recommended input range for the 12 V version is approximately 13.8 V to 17 V (V_I max = 30 V absolute maximum). A 0.1 uF ceramic decoupling capacitor to GND is required close to this pin for stability.
2 GND power_in Device ground / return. Electrically common with the exposed metal tab of the D2PAK package, which also serves as the primary thermal path to the PCB (R_thJC = 3 C/W, R_thJA = 62.5 C/W for D2PAK).
3 OUTPUT power_out Regulated +12 V output, 1.5 A max (internally current-limited to ~2 A short-circuit). Typical V_O = 12 V (11.5 V min / 12.5 V max over full I_O = 5 mA to 1.5 A). Requires a minimum 22 uF output capacitor to GND for loop stability.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package TO-263-2
Category Power Management (PMIC)
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • L4940D2T12-TR
  • L4940D2T12-TRD2T5-TR
  • L4940D2T12-TRV5
  • L4940D2T12-TRV85

CAD (KiCad official)

  • Symbol: L4940D2T12-TR
  • Footprint: Package_TO_SOT_SMD:TO-263-2
  • 3D model: TO-263-2 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: STMicroelectronics datasheet (25 pp, sha256 82b4fdbd2bcc1df9, 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