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AP2121AK-3.2TRG1

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

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AP2121AK-3.2TRG1

Diodes Incorporated · Linear Voltage Regulators (LDO) · SOT-23-5

AP2121AK-3.2TRG1 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, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VIN power_in Input voltage pin, operating range 2V to 6V (6.5V absolute maximum), requiring a 1µF input capacitor.
2 GND power_in Ground pin.
3 CE input Active-high enable input with built-in pull-down resistor (5MΩ typical); logic high (≥1.5V) enables the output and logic low (≤0.25V) shuts down the regulator.
4 NC unconnected No connection.
5 VOUT power_out Regulated 3.2V output (±2%), more than 200mA output current, requires at least 1µF output capacitance with ESR 0.01Ω to 100Ω.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-23-5
Category Power Management
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 3.136 3.2 3.264 V VIN = 4.2V, 1mA ≤ IOUT ≤ 30mA 12
Output Current IOUT 200 mA VIN-VOUT = 1V 12
Input Voltage VIN 6 V 12
Load Regulation VRLOAD 12 40 mV VIN = 4.2V, 1mA ≤ IOUT ≤ 80mA 12
Line Regulation VRLINE 4 16 mV 3.7V ≤ VIN ≤ 6V, IOUT = 30mA 12
Dropout Voltage VDROP 20 40 mV IOUT = 10mA 12
Dropout Voltage VDROP 150 300 mV IOUT = 100mA 12
Dropout Voltage VDROP 200 400 mV IOUT = 150mA 12
Dropout Voltage VDROP 250 500 mV IOUT = 200mA 12
Quiescent Current IQ 25 50 µA VIN = 4.2V, IOUT = 0mA 12
Standby Current ISTD 0.1 1 µA VIN = 4.2V, VCE in OFF mode 12
CE High Voltage 1.5 V CE input voltage "High" 12
CE Low Voltage 0.25 V CE input voltage "Low" 12
CE Pull-Down Resistance RPD 2.5 5 10 MΩ 12
Input Voltage (operating) 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 12
Power Supply Rejection Ratio PSRR 70 dB Ripple 0.5Vp-p, f = 1kHz, VIN = 4.2V 12
Output Voltage Temperature Coefficient ∆VOUT/∆T 320 µV/oC IOUT = 30mA (printed ±320) 12
Output Voltage Temperature Coefficient (∆VOUT/VOUT)/∆T 100 ppm/oC IOUT = 30mA (printed ±100) 12
Short Current Limit ILIMIT 50 mA VOUT = 0V 12
RMS Output Noise VNOISE 30 µVrms TA = +25oC, 10Hz ≤ f ≤ 100kHz 12

CAD (KiCad official)

  • Symbol: AP2121AK-3.2TRG1
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: ap2121ak-3-2trg1-etched.step / ap2121ak-3-2trg1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ap2121ak-3-2trg1.step / ap2121ak-3-2trg1.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 2026-10-23, 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: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF