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78D09AL-TN3-R

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

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78D09AL-TN3-R

UTC(Unisonic Tech) · Linear Voltage Regulators (LDO) · TO-252

78D09AL-TN3-R from UTC(Unisonic Tech), in a TO-252. 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 pin, absolute maximum 35 V, with 11.5~24 V specified for 9 V output regulation on the 78D09A.
2 GND power_in Ground pin, common reference for input and output.
3 OUTPUT power_out Regulated 9 V output (8.64~9.36 V) supplying up to 1 A with 1.8 A typical peak current and short-circuit current limiting.

Key specifications

Parameter Value
Manufacturer UTC(Unisonic Tech)
Package TO-252
Category Power Management ICs
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 ΔVOUT 90 mV IOUT=5mA~1.0A 6
Load Regulation ΔVOUT 45 mV IOUT=0.25A~0.75A 6
Line Regulation ΔVOUT 90 mV VIN=11.5~25V 6
Quiescent Current IQ 8 mA IOUT≤1.0A 6
Quiescent Current Change ΔIQ 1 mA VIN=11.5~24V 6
Quiescent Current Change ΔIQ 0.5 mA IOUT=5mA~1.0A 6
Ripple Rejection RR 53 72 dB VIN=12.5~22.5V, f=120Hz 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
Dropout Voltage VD 2 V 6
Input Voltage VIN 35 V 4
Output Current IOUT 1 A 4
Power Dissipation PD 10 W TC=25°C, TO-251/TO-252 4
Junction Temperature TJ 150 °C 4
Operating Temperature TOPR -40 85 °C 4
Storage Temperature TSTG -55 150 °C 4
Thermal Resistance Junction to Ambient θJA 112 °C/W TO-251/TO-252 4
Thermal Resistance Junction to Case θJC 12.5 °C/W TO-251/TO-252 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: 78D09AL-TN3-R
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: TO-252 (KiCad packages3D, STEP)
  • 3D model files: 78d09al-tn3-r-etched.step / 78d09al-tn3-r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); 78d09al-tn3-r.step / 78d09al-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 5a45f24e9c4ccbc8, retrieved 2026-10-22, 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