component
AP2121AK-2.8TRE1
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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README
markdownAP2121AK-2.8TRE1
Diodes Incorporated · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5
AP2121AK-2.8TRE1 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 supply pin; the datasheet recommends VIN from 2 V to 6 V, with an absolute maximum rating of 6.5 V. |
| 2 | GND | power_in | Ground reference pin for the regulator. |
| 3 | CE | input | Active-high enable input: logic high (at least 1.5 V) enables the output and logic low (at most 0.25 V) puts the regulator in shutdown; the AK-suffix part has an internal 2.5 to 10 MΩ pull-down resistor, and the enable voltage must not exceed VIN + 0.3 V per the absolute maximum ratings. |
| 4 | NC | unconnected | No internal connection; leave this pin unconnected. |
| 5 | VOUT | power_out | Regulated output voltage; the 2.8 V version is specified at 2.744 V to 2.856 V for 1 mA to 30 mA load, with at least 200 mA output current available at VIN-VOUT = 1 V. |
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 | 2.744 | 2.8 | 2.856 | V | VIN = 3.8V, 1mA ≤ IOUT ≤ 30mA | 9 |
| Input Voltage | VIN | 6 | V | 9 | |||
| Output Current | IOUT | 200 | mA | VIN-VOUT = 1V | 9 | ||
| Load Regulation | VRLOAD | 12 | 40 | mV | VIN = 3.8V, 1mA ≤ IOUT ≤ 80mA | 9 | |
| Line Regulation | VRLINE | 4 | 16 | mV | 3.3V ≤ VIN ≤ 6V, IOUT = 30mA | 9 | |
| Dropout Voltage | VDROP | 20 | 40 | mV | IOUT = 10mA | 9 | |
| Dropout Voltage | VDROP | 150 | 300 | mV | IOUT = 100mA | 9 | |
| Dropout Voltage | VDROP | 200 | 400 | mV | IOUT = 150mA | 9 | |
| Dropout Voltage | VDROP | 250 | 500 | mV | IOUT = 200mA | 9 | |
| Quiescent Current | IQ | 25 | 50 | µA | VIN = 3.8V, IOUT = 0mA | 9 | |
| Standby Current | ISTD | 0.1 | 1 | µA | VIN = 3.8V, VCE in OFF mode | 9 | |
| CE High Voltage | 1.5 | V | CE input voltage "High" | 9 | |||
| CE Low Voltage | 0.25 | V | CE input voltage "Low" | 9 | |||
| CE Pull-Down Resistance | RPD | 2.5 | 5 | 10 | MΩ | 9 | |
| Input Voltage (recommended operating) | VIN | 2 | 6 | V | 3 | ||
| Operating Ambient Temperature Range | TA | -40 | 85 | °C | 3 | ||
| Input Voltage (absolute maximum) | VIN | 6.5 | V | 3 | |||
| Enable Input Voltage | VCE | -0.3 | V | 3 | |||
| Output Current (absolute maximum) | IOUT | 300 | mA | 3 | |||
| Junction Temperature | TJ | 150 | °C | 3 | |||
| Storage Temperature Range | TSTG | -65 | 150 | °C | 3 | ||
| Lead Temperature (Soldering) | TLEAD | 260 | °C | Soldering, 10sec | 3 | ||
| ESD (Human Body Model) | ESD | 2000 | V | Human Body Model | 3 | ||
| ESD (Machine Model) | ESD | 200 | V | Machine Model | 3 | ||
| Power Supply Rejection Ratio | PSRR | 70 | dB | Ripple 0.5Vp-p, f = 1kHz; VIN = 3.8V | 9 | ||
| Output Voltage Temperature Coefficient | ∆VOUT/∆T | 280 | µV/oC | IOUT = 30mA | 9 | ||
| Output Voltage Temperature Coefficient (ppm) | (∆VOUT/VOUT)/∆T | 100 | ppm/oC | 9 | |||
| Short Current Limit | ILIMIT | 50 | mA | VOUT = 0V | 9 | ||
| RMS Output Noise | VNOISE | 30 | µVrms | TA = +25oC, 10Hz ≤ f ≤ 100kHz | 9 | ||
| Thermal Resistance (Junction to Ambient), SOT-23-5 | θJA | 250 | °C/W | 3 | |||
| Thermal Resistance (Junction to Case), SOT-23-5 | θJC | 74 | °C/W | 9 |
CAD (KiCad official)
- Symbol:
AP2121AK-2.8TRE1 - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files:
ap2121ak-2-8tre1-etched.step/ap2121ak-2-8tre1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ap2121ak-2-8tre1.step/ap2121ak-2-8tre1.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 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-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: KiCad official libraries (CC-BY-SA 4.0).