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AP2121AK-2.5TRE1

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Diodes Incorporated Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentpower management (pmic)ap2121ak-2.5tre1factory-2.0.0extractor-text

Verified AP2121AK-2.5TRE1

by Ray · last 13 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

13 Nov 2026RayPublished by the parts factory: tier mfr, 5 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • •array (skip): not an array of element pairs
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: AP2121AK-2.5TRE1 · SOT-23-5 · 5 pins
  • ✓copper: 5 copper pads, none touching another net
  • ✓datasheet: all 5 pin names found in the 28-page datasheet
  • ✓distributor: lcsc C5564072, digikey 31-AP2121AK-2.5TRE1TR-ND, mouser 621-AP2121AK-2.5TRE1
  • ✓family: SOT-23-5
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-m5kc9jl0/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • ✓package_fit: height and body within the datasheet's package drawing (datasheet p.23)
  • ✓pads: 5 pins = 5 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 5 pins agree
  • ✓symbol_text: no pin names collide
  • ✓viewers: viewers/footprint.html 19 kB, viewers/symbol.html 8 kB
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ ap2121ak-2-5tre1.kicad_sym✓ ap2121ak-2-5tre1.kicad_mod✓ ap2121ak-2-5tre1.step
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AP2121AK-2.5TRE1

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

AP2121AK-2.5TRE1 from Diodes Incorporated, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model). Symbol and footprint from KiCad-official CAD; the 3D model is generated from the datasheet's package dimensions.

Pinout

Pin Name Type Function
1 VIN power_in Input voltage supply, operating range 2V to 6V (6.5V absolute maximum), requiring a 1µF input capacitor.
2 GND power_in Ground reference pin for the regulator.
3 CE input Active-high enable input with built-in pull-down resistor (typ 5MΩ); logic high (≥1.5V) enables the output and logic low (≤0.25V) shuts down.
4 NC unconnected No connection.
5 VOUT power_out Regulated 2.5V output (±2%) delivering at least 200mA, requiring more than 1µF output capacitance with ESR from 0.01Ω to 100Ω.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-23-5
Category Power Management (PMIC)
Pins 5

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Output Voltage VOUT 2.45 2.5 2.55 V VIN = 3.5V, 1mA ≤ IOUT ≤ 30mA 8
Input Voltage VIN 6 V 8
Output Current IOUT 200 mA VIN-VOUT = 1V 8
Load Regulation VRLOAD 12 40 mV VIN = 3.5V, 1mA ≤ IOUT ≤ 80mA 8
Line Regulation VRLINE 4 16 mV 3V ≤ VIN ≤ 6V, IOUT = 30mA 8
Dropout Voltage VDROP 20 40 mV IOUT = 10mA 8
Dropout Voltage VDROP 150 300 mV IOUT = 100mA 8
Dropout Voltage VDROP 200 400 mV IOUT = 150mA 8
Dropout Voltage VDROP 250 500 mV IOUT = 200mA 8
Quiescent Current IQ 25 50 µA VIN = 3.5V, IOUT = 0mA 8
Standby Current ISTD 0.1 1 µA VIN = 3.5V, VCE in OFF mode 8
CE High Voltage 1.5 V CE input voltage "High" 8
CE Low Voltage 0.25 V CE input voltage "Low" 8
CE Pull-Down Resistance RPD 2.5 5 10 MΩ 8
Recommended Input Voltage VIN 2 6 V 3
Operating Ambient Temperature Range TA -40 85 °C 3
Input Voltage VIN 6.5 V 3
Enable Input Voltage VCE -0.3 V -0.3 to VIN +0.3 V 3
Output Current IOUT 300 mA 3
Junction Temperature TJ 150 °C 3
Storage Temperature Range TSTG -65 150 °C 3
Lead Temperature TLEAD 260 °C Soldering, 10sec 3
ESD Human Body Model ESD 2000 V 3
ESD Machine Model ESD 200 V 3
Thermal Resistance Junction to Ambient θJA 250 °C/W SOT-23-5 3
Thermal Resistance Junction to Case θJC 74 °C/W SOT-23-5 8
Power Supply Rejection Ratio PSRR 70 dB Ripple 0.5Vp-p, f = 1kHz, VIN = 3.5V 8
Output Voltage Temperature Coefficient ΔVOUT/ΔT 250 µV/°C IOUT = 30mA (printed ±250) 8
Output Voltage Temperature Coefficient (ΔVOUT/VOUT)/ΔT 100 ppm/°C IOUT = 30mA (printed ±100) 8
Short Current Limit ILIMIT 50 mA VOUT = 0V 8
RMS Output Noise VNOISE 30 µVrms TA = +25°C, 10Hz ≤ f ≤ 100kHz 8

CAD (land: KiCad; 3D: generated from the datasheet)

  • Symbol: AP2121AK-2.5TRE1
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5, generated on the KiCad land (body 1.6 x 2.91 mm, terminals on the pads, 1.45 mm tall, datasheet A, max). KiCad's stock model for this land is taller than the datasheet allows, so the model is generated from the datasheet drawing; the dimensions come from the datasheet drawing where it was read and are defaults otherwise (see provenance.model_3d_generated), not the manufacturer's CAD (STEP)
  • 3D model files: ap2121ak-2-5tre1-etched.step / ap2121ak-2-5tre1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ap2121ak-2-5tre1.step / ap2121ak-2-5tre1.glb are the bare package body.

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (28 pp, sha256 41e2a9b4a27eea83, retrieved 2026-11-13, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-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: land: KiCad official libraries (CC-BY-SA 4.0); 3D: generated from the datasheet's package dimensions (provenance.model_3d_generated).

Datasheet PDF