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AP2139AK-2.8TRG1

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by Ray

Diodes Incorporated AP2139AK 2 8TRG1 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Datasheet

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Contents

README

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AP2139AK-2.8TRG1

Diodes Incorporated · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5

AP2139AK-2.8TRG1 from Diodes Incorporated, in a SOT-23-5. 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 VIN power_in Input supply voltage. Recommended operating range 2.5 V to 6.0 V (absolute max 6.6 V). A 1 µF input capacitor is required for stability.
2 GND power_in Device ground reference return for the LDO regulator.
3 CE input Active-high chip enable. Logic high (VIH ≥ 1.2 V) enables the regulator; logic low (VIL ≤ 0.3 V) shuts it down and triggers the AP2139's active quick output discharge. Internal pull-down current ~0.2 µA. Allowed voltage range -0.3 V to VIN+0.3 V.
4 NC unconnected No internal connection. May be left floating or tied to GND.
5 VOUT power_out Regulated 2.8 V output (±2% accuracy), 250 mA maximum output current. Requires a >1 µF output capacitor with ESR 0.01 Ω to 100 Ω (ceramic recommended) for stability.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-23-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • AP2139AK-2.8TRG1

CAD (KiCad official)

  • Symbol: AP2139AK-2.8TRG1
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (29 pp, sha256 027e80492a5bc199, retrieved 2026-08-17, tier: manufacturer)
  • 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