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78D09AG-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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78D09AG-TN3-R

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

78D09AG-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 voltage, absolute maximum 35 V, with 11.5~24 V specified for the 78D09A regulation range.
2 GND power_in Ground reference pin shared by input and output.
3 OUTPUT power_out Regulated 9 V output (8.64~9.36 V) supplying up to 1 A.

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~1.0A 6
Output Voltage VOUT 8.55 9.45 V VIN =11.524V, IOUT =5mA1.0A 6
Load Regulation VOUT 90 mV IOUT =5mA~1.0A 6
Load Regulation VOUT 45 mV IOUT =0.25A~0.75A 6
Line Regulation VOUT 90 mV VIN =11.5~25V 6
Quiescent Current IQ 8 mA IOUT≤1.0A 6
Quiescent Current Change IQ 1 mA VIN =11.5~24V 6
Quiescent Current Change IQ 0.5 mA IOUT =5mA~1.0A 6
Dropout Voltage VD 2 V 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
Output Noise Voltage eN 58 V 10Hz≤f≤100kHz 6
Peak Output Current IPEAK 1.8 A 6
Short-Circuit Current ISC 250 mA VIN =35V 6
Input Voltage VIN 35 V 4
Output Current IOUT 1 A 4
Power Dissipation (TO-251/TO-252) PD 10 W TC=25°C 4
Junction Temperature TJ 150 °C 4
Operating Temperature TOPR -40 85 °C 4
Storage Temperature TSTG -55 150 °C 4
Junction to Ambient (TO-251/TO-252) θJA 112 °C/W 4
Junction to Case (TO-251/TO-252) θJC 12.5 °C/W 4

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part Material Colour / plating Datasheet says Page
contacts copper 2. The maximum steady state usable output current are dependent on input voltage, heat sinking, lead length of the package and copper pattern of PCB. The data are showed as electrical characteristics 4

CAD (KiCad official)

  • Symbol: 78D09AG-TN3-R
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)
  • 3D model files: 78d09ag-tn3-r-etched.step / 78d09ag-tn3-r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 78d09ag-tn3-r.step / 78d09ag-tn3-r.glb are the bare package body.

Provenance

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

  • Datasheet: UTC Unisonic Tech datasheet (10 pp, sha256 b1172883ffec46ec, retrieved 2026-10-18, 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