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AP2127K-4.2TRG1

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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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AP2127K-4.2TRG1

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

AP2127K-4.2TRG1 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 Power input; recommended operating input voltage 2.5V to 6V (absolute maximum 6.5V), decoupled with a 1µF ceramic capacitor to GND placed close to the device.
2 GND power_in Ground.
3 Shutdown input Enable input; high level at least 1.5V enables, low level at most 0.5V shuts down the output (with 60Ω typical auto-discharge MOSFET), and has an internal 3MΩ typical pull-down resistance.
4 NC/ADJ unconnected No connection on fixed-voltage versions such as the 4.2V AP2127K-4.2; on the adjustable version it is the VOUT feedback input for the resistor divider.
5 VOUT power_out Regulated power output (4.2V fixed for this part, ±2% accuracy, up to 300mA), requiring a 1µF or larger ceramic output capacitor.

Key specifications

Parameter Value
Manufacturer Diodes Incorporated
Package SOT-23-5
Category Power Management ICs
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 98 102 % of VOUT VIN = VOUT +1V, 1mA ≤ IOUT ≤ 300mA 5
Input Voltage VIN 2.5 6 V 5
Maximum Output Current IOUT(MAX) 300 400 mA VIN - VOUT = 1V, VOUT = 0.98 x VOUT 5
Load Regulation ΔVOUT 4 10 mV VIN - VOUT = 1V, 1mA ≤ IOUT ≤ 300mA 5
Line Regulation ΔVOUT 0.5 5 mV VOUT + 0.5V ≤ VIN ≤ 6V, IOUT = 30mA 5
Dropout Voltage VDROP 170 300 mV VOUT = 2.5V, 2.8V, 3.0V, 3.3V, 4.2V, IOUT = 300mA 5
Quiescent Current IQ 60 90 µA VIN = VOUT +1V, IOUT = 0mA 5
Standby Current ISTD 0.1 1 µA VIN = VOUT +1V, VSHUTDOWN in off mode 5
Shutdown High Voltage 1.5 V Shutdown Input Voltage High 5
Shutdown Low Voltage 0.5 V Shutdown Input Voltage Low 5
Input Voltage VIN 2.5 6 V @TA = +25°C 4
Operating Ambient Temperature Range TA -40 85 °C @TA = +25°C 4
Input Voltage VIN 6.5 V @TA = +25°C 4
Output Current IOUT 450 mA @TA = +25°C 4
Junction Temperature TJ 150 °C @TA = +25°C 4
Storage Temperature Range TSTG -65 150 °C 4
Lead Temperature TLEAD 260 °C Soldering, 10sec 4
ESD Human Body Model ESD 6000 V 4
ESD Machine Model ESD 200 V 4
Thermal Resistance Junction to Ambient θJA 250 °C/W SOT-23-5 4
Thermal Resistance Junction to Case θJC 150 °C/W SOT-23-5 5
Reference Voltage VREF 0.784 0.8 0.816 V VIN = VOUT +1V, 1mA ≤ IOUT ≤ 300mA 5
Output Voltage Temperature Coefficient ΔVOUT/VOUT/ΔT 100 ppm/°C IOUT = 30mA, -40°C ≤ TA ≤ +85°C (printed ±100) 5
Short Current Limit ISHORT 50 mA VOUT = 0V 5
Soft Start Time tSS 50 µs 5
Power Supply Rejection PSRR 68 dB AP2127-1.0V to 4.2V, Ripple 1VP-P, VIN = VOUT +1V, f = 1kHz 5
Discharge MOSFET RDS(ON) RDS(ON) 60 Ω Shutdown Input Voltage Low 5
Thermal Shutdown 165 °C 5

CAD (KiCad official)

  • Symbol: AP2127K-4.2TRG1
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: SOT-23-5 (KiCad packages3D, STEP)
  • 3D model files: ap2127k-4-2trg1-etched.step / ap2127k-4-2trg1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ap2127k-4-2trg1.step / ap2127k-4-2trg1.glb are the bare package body.

Provenance

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

  • Datasheet: Diodes Incorporated datasheet (24 pp, sha256 d48c96ac985d348a, 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