component
AP2121AK-2.5TRE1
Public Made by Adomby adom
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.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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Contents
README
markdownAP2121AK-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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ap2121ak-2-5tre1.step/ap2121ak-2-5tre1.glbare 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, primaryclaude-sonnet-5-5(text), consensusclaude-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).