# LM317K-TQ2-R

**UTC(Unisonic Tech)** · Linear Voltage Regulators (LDO) · TO-263-2

LM317K-TQ2-R from UTC(Unisonic Tech), in a TO-263-2. 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 | ADJ | passive | Adjust pin sets the output voltage through the external divider, with adjustable pin current of 50 µA typical and 100 µA maximum, and CADJ is connected between this pin and ground for ripple rejection. |
| 2 | VOUT | power_out | Regulated output, adjustable from 1.3 V to 37 V, supplying output current in excess of 1 A. |
| 3 | VIN | power_in | Unregulated input supply, with the input-to-output voltage difference limited to 40 V absolute maximum and regulation specified for 3 V ≤ VIN-VOUT ≤ 40 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UTC(Unisonic Tech) |
| Package | TO-263-2 |
| 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 |
|---|---|---|---|---|---|---|---|
| Line Regulation | VOUT/VOUT |  | 0.01 | 0.04 | %/V | 3V≦VIN-VOUT≦40V | 3 |
| Line Regulation |  |  | 5 | 25 | mV | VOUT≦5V | 3 |
| Load Regulation | VOUT |  | 0.1 | 0.5 | % | 10mA≦IOUT≦1A, VOUT≧5V | 3 |
| Adjustable Pin Current | IADJ |  | 50 | 100 | μA |  | 3 |
| Adjustable Pin Current Change | IADJ |  | 0.2 | 5 | μA | 3V≦VIN-VOUT≦40V, 10mA≦IOUT≦1A, PD≦20W | 3 |
| Reference Voltage | VREF | 1.2 | 1.25 | 1.3 | V | 3V≦VIN-VOUT≦40V, 10mA≦IOUT≦1A, PD≦20W | 3 |
| Minimum Load Current for Regulation | IL(MIN) |  | 3.5 | 10 | mA | VIN-VOUT=40V | 3 |
| Maximum Output Current | IO(MAX) |  | 0.2 | 0.3 | A | VIN-VOUT=40V, PD≦20W | 3 |
| Ripple Rejection | RR | 66 | 80 |  | dB | VOUT=10V,f=120HZ CADJ=10μF | 3 |
| Input - Output Voltage Difference | VIN-VOUT |  |  | 40 | V |  | 3 |
| Junction Temperature | TJ |  |  | 125 | C |  | 3 |
| Operating Temperature | TOPR | -40 |  | 85 | C |  | 3 |
| Storage Temperature | TSTG | -40 |  | 150 | C |  | 3 |
| Junction-to-Ambient Thermal Resistance | θJA |  | 65 |  | C/W | TO-263/TO-263-3 package | 3 |
| Junction-to-Case Thermal Resistance | θJC |  | 5 |  | C/W | TO-263 package | 3 |

## CAD (KiCad official)

- Symbol: `LM317K-TQ2-R`
- Footprint: `Package_TO_SOT_SMD:TO-263-2`
- 3D model: TO-263-2 (KiCad packages3D, STEP)
- 3D model files: `lm317k-tq2-r-etched.step` / `lm317k-tq2-r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm317k-tq2-r.step` / `lm317k-tq2-r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UTC(Unisonic Tech) datasheet](docs/lm317k-tq2-r-datasheet.pdf) (5 pp, sha256 `14286ff814b58d10`, retrieved 2026-11-05, tier: manufacturer)
- **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](docs/lm317k-tq2-r-datasheet.pdf)