# 78L15L-T92-B

**UTC(Unisonic Tech)** · Linear Voltage Regulators (LDO) · TO-92-2.54mm

78L15L-T92-B from UTC(Unisonic Tech), in a TO-92-2.54mm. 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 | OUTPUT | power_out | Regulated 15V output (78L15, 14.40-15.60V at TJ=25°C) delivering up to 100mA, with a recommended 0.1μF bypass capacitor. |
| 2 | GND | power_in | Ground reference pin for input and output. |
| 3 | INPUT | power_in | Unregulated input voltage, absolute maximum 35V for 10-18V output versions, with a recommended 0.33μF bypass capacitor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UTC(Unisonic Tech) |
| Package | TO-92-2.54mm |
| 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 | 14.4 | 15 | 15.6 | V | TJ=25°C | 5 |
| Output Voltage | VOUT | 14.25 |  | 15.75 | V | 17.5V≤VIN≤30V,IOUT=1mA-40mA | 5 |
| Load Regulation | ΔVOUT |  | 25 | 150 | mV | TJ=25°C, IOUT=1mA-100mA | 5 |
| Load Regulation | ΔVOUT |  | 15 | 75 | mV | TJ=25°C, IOUT=1mA-40mA | 5 |
| Line Regulation | ΔVOUT |  | 25 | 150 | mV | 17.5V≤VIN≤30V,TJ=25°C | 5 |
| Line Regulation | ΔVOUT |  | 15 | 75 | mV | 20V≤VIN≤30V,TJ=25°C | 5 |
| Quiescent Current | IQ | 2.2 |  | 6.5 | mA | VIN=23V,IOUT=0mA,TJ=25°C | 5 |
| Quiescent Current Change | ΔIQ |  |  | 1.5 | mA | 20V≤VIN≤30V | 5 |
| Quiescent Current Change | ΔIQ |  |  | 0.1 | mA | 1mA≤VIN≤40mA | 5 |
| Ripple Rejection | RR | 34 | 63 |  | dB | 18.5V≤VIN≤28.5V,f=120Hz, TJ=25°C | 5 |
| Output Noise Voltage | eN |  | 90 |  | μV | 10Hz≤f≤100kHz | 5 |
| Temperature Coefficient of VOUT | ΔVO/ΔT |  | -1.3 |  | mV/°C | IOUT=5mA | 5 |
| Dropout Voltage | VD |  | 1.7 |  | V | TJ=25°C | 5 |
| Input Voltage | VIN |  |  | 35 | V | VOUT=10~18V | 3 |
| Output Current | IOUT |  |  | 100 | mA |  | 3 |
| Power Dissipation | PD |  |  | 625 | mW | TO-92/TO-92NL | 3 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 3 |
| Operating Temperature | TOPR | -40 |  | 85 | °C |  | 3 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 3 |

## 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 |  | Note 1. The Maximum steady state usable output current is dependent on input voltage, heat sinking, lead length of the package and copper pattern of PCB. | 5 |

## CAD (KiCad official)

- Symbol: `78L15L-T92-B`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92-2.54mm (KiCad packages3D, STEP)
- 3D model files: `78l15l-t92-b-etched.step` / `78l15l-t92-b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `78l15l-t92-b.step` / `78l15l-t92-b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UTC(Unisonic Tech) datasheet](docs/78l15l-t92-b-datasheet.pdf) (8 pp, sha256 `019cf0ff8e450efc`, retrieved 2026-10-31, 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](docs/78l15l-t92-b-datasheet.pdf)