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78D09L-TN3-R

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UTC Unisonic Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-252-2(DPAK). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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78D09L-TN3-R

UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252-2(DPAK)

78D09L-TN3-R from UTC Unisonic Tech, in a TO-252-2(DPAK). 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 INPUT power_in Unregulated input supply; absolute maximum input voltage is 35 V, and the 78D09 output regulation is specified for VIN of 11.5 V to 24 V.
2 GND power_in Ground reference pin for the regulator, designated GND in the datasheet pin code.
3 OUTPUT power_out Regulated 9 V output (8.64 V to 9.36 V over 5 mA to 0.5 A load); output current is up to 0.5 A, with 1.2 A peak output current stated.

Key specifications

Parameter Value
Manufacturer UTC Unisonic Tech
Package TO-252-2(DPAK)
Category Power Management (PMIC)
Pins 3

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 8.64 9 9.36 V IOUT=5mA~0.5A 6
Output Voltage VOUT 8.55 9.45 V VIN=11.524V, IOUT=5mA0.5A 6
Load Regulation ∆VOUT 90 mV IOUT=5mA~0.5A 6
Load Regulation ∆VOUT 45 mV IOUT=5mA~200mA 6
Line Regulation ∆VOUT 90 mV VIN=11.5~25V 6
Quiescent Current IQ 8 mA IOUT=0.5A 6
Quiescent Current Change ∆IQ 1 mA VIN=11.5~24V 6
Quiescent Current Change ∆IQ 0.5 mA IOUT=5mA~0.5A 6
Output Noise Voltage eN 58 μV 10Hz≤f≤100kHz 6
Ripple Rejection RR 56 72 dB VIN=12.5~22.5V, f=120Hz 6
Temperature coefficient of VOUT ∆VOUT/∆T -1.1 mV/°C IOUT=5mA 6
Peak Output Current IPEAK 1.2 A 6
Short-Circuit Current ISC 250 mA VIN=VOUT+19V 6
Dropout Voltage VD 2 V 6
Input Voltage VIN 35 V 4
Output Current IOUT 0.5 A 4
Power Dissipation (TC=25°C) PD 10 W TC=25°C 4
Operating Junction Temperature TJ -20 150 °C 4
Storage Temperature TSTG -65 150 °C 4
Junction to Case (TO-251/TO-252) θJC 12.5 °C/W TO-251/TO-252 4

CAD (KiCad official)

  • Symbol: 78D09L-TN3-R
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)
  • 3D model files: 78d09l-tn3-r-etched.step / 78d09l-tn3-r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 78d09l-tn3-r.step / 78d09l-tn3-r.glb are the bare package body.

Provenance

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

  • Datasheet: UTC Unisonic Tech datasheet (9 pp, sha256 d4475e10472bbb50, retrieved 2026-10-19, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-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