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78D09LL-TN3-R
Public Made by Adomby adom
UTC Unisonic Tech Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-252. 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
markdown78D09LL-TN3-R
UTC Unisonic Tech · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252
78D09LL-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 supply pin; the datasheet gives an absolute maximum input voltage VIN of 35 V and recommends a bypass capacitor placed as close as possible to the regulator. |
| 2 | GND | power_in | Common ground (reference) pin of the regulator, shared between input and output return paths. |
| 3 | OUTPUT | power_out | Regulated 9 V output pin for the 78D09L variant, with VOUT of 8.64 V to 9.36 V at IOUT = 5 mA to 0.5 A and output current up to 0.5 A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | TO-252 |
| 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 | 5 |
| Output Voltage | VOUT | 8.55 | 9.45 | V | VIN =11.5 |
5 | |
| Load Regulation | ∆VOUT | 180 | mV | IOUT=5mA~0.5A | 5 | ||
| Load Regulation | ∆VOUT | 90 | mV | IOUT=5mA~200mA | 5 | ||
| Line Regulation | ∆VOUT | 180 | mV | VIN =11.5~25V | 5 | ||
| Quiescent Current | IQ | 8 | mA | IOUT=0.5A | 5 | ||
| Quiescent Current Change | ∆IQ | 1 | mA | VIN=11.5~24V | 5 | ||
| Quiescent Current Change | ∆IQ | 0.5 | mA | IOUT=5mA~0.5A | 5 | ||
| Ripple Rejection | RR | 53 | 72 | dB | VIN=12.5~22.5V,f=120Hz | 5 | |
| Absolute Maximum Junction Temperature | TJ | -20 | 150 | °C | 4 | ||
| Storage Temperature | TSTG | -65 | 150 | °C | 4 | ||
| Input Voltage | VIN | 35 | V | 4 | |||
| Output Current | IOUT | 0.5 | A | 4 | |||
| Power Dissipation (TO-251/TO-252) | PD | 10 | W | TC=25°C | 4 | ||
| Output Noise Voltage | eN | 58 | μV | 10Hz≤f≤100kHz | 5 | ||
| Peak Output Current | IPEAK | 1.2 | A | 5 | |||
| Short-Circuit Current | ISC | 250 | mA | VIN=VOUT+19V | 5 | ||
| Dropout Voltage | VD | 2 | V | 5 | |||
| Thermal Resistance Junction to Case (TO-251/TO-252) | θJC | 12.5 | °C/W | Junction to Case | 4 |
CAD (KiCad official)
- Symbol:
78D09LL-TN3-R - Footprint:
Package_TO_SOT_SMD:TO-252-2 - 3D model: TO-252 (KiCad packages3D, STEP)
- 3D model files:
78d09ll-tn3-r-etched.step/78d09ll-tn3-r-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);78d09ll-tn3-r.step/78d09ll-tn3-r.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UTC Unisonic Tech datasheet (8 pp, sha256
7387ebc2bfcc2697, retrieved 2026-10-17, 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).