# LD1085V

**STMicroelectronics** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-220

LD1085V from STMicroelectronics, in a TO-220. 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/GND | passive | Adjust pin on the adjustable LD1085V (reference voltage 1.25 V, adjust pin current 55 µA typ. and 120 µA max.), which is the ground pin on fixed-voltage versions. |
| 2 | OUTPUT | power_out | Regulated output delivering up to 3 A, with typical dropout of 1.3 V at 3 A and a 10 µF minimum output capacitor needed for stability. |
| 3 | INPUT | power_in | Unregulated input voltage, absolute maximum 30 V DC, with a 10 µF input capacitor used in the datasheet test conditions. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | TO-220 |
| 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 |
|---|---|---|---|---|---|---|---|
| Reference voltage | Vref | 1.237 | 1.25 | 1.263 | V | IO = 10 mA, TJ = 25°C | 11 |
| Reference voltage | Vref | 1.225 | 1.25 | 1.275 | V | IO = 10 mA to 3 A, VI = 2.85 to 30 V | 11 |
| Line regulation | ΔVO |  | 0.015 | 0.2 | % | IO = 10 mA, VI = 2.85 to 16.5 V, TJ = 25°C | 11 |
| Line regulation | ΔVO |  | 0.035 | 0.2 | % | IO = 10 mA, VI = 2.85 to 16.5 V | 11 |
| Load regulation | ΔVO |  | 0.1 | 0.3 | % | IO = 10 mA to 3 A, TJ = 25°C | 11 |
| Load regulation | ΔVO |  | 0.2 | 0.4 | % | IO = 0 to 3 A | 11 |
| Dropout voltage | Vd |  | 1.3 | 1.5 | V | IO = 3 A | 11 |
| Minimum load current | IO(min) |  | 3 | 10 | mA | VI = 30 V | 11 |
| Short-circuit current | Isc |  | 5.5 | 6.5 | A | VI - VO = 5 V | 11 |
| Short-circuit current | Isc |  | 0.5 | 0.7 | A | VI - VO = 25 V | 11 |
| Thermal regulation |  |  | 0.003 | 0.015 | %/W | TA = 25°C, 30ms pulse | 11 |
| Supply voltage rejection | SVR |  | 60 | 72 | dB | f = 120 Hz, CO = 25 µF, CADJ = 25 µF, IO = 3 A, VI = 6.25 ± 3 V | 11 |
| Adjust pin current | IADJ |  | 55 | 120 | µA | VI = 4.25 V, IO = 10 mA | 11 |
| Adjust pin current change | ΔIADJ |  | 0.2 | 5 | µA | IO = 10 mA to 3 A, VI = 2.85 to 16.5 V | 11 |
| Input voltage DC | VI |  |  | 30 | V |  | 5 |
| Storage temperature range | TSTG | -55 |  | 150 | °C |  | 5 |
| Operating junction temperature range | TOP | -40 |  | 125 | °C |  | 5 |
| Thermal resistance junction-case (TO-220) | RthJC |  | 3 |  | °C/W |  | 5 |
| Thermal resistance junction-ambient (TO-220) | RthJA |  | 50 |  | °C/W |  | 5 |

## CAD (KiCad official)

- Symbol: `LD1085V`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220 (KiCad packages3D, STEP)
- 3D model files: `ld1085v-etched.step` / `ld1085v-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ld1085v.step` / `ld1085v.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588945627787378688) (27 pp, sha256 `8b24eef0a5bb342a`, retrieved 2026-10-11, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/ld1085v-datasheet.pdf)