# LM385M3X-1.2

**Texas Instruments** · Voltage Reference · SOT-23

LM385M3X-1.2 from Texas Instruments, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | + | passive | Cathode (positive terminal) of the band-gap reference diode. Reverse-biased across an external current-limiting resistor; regulates to ~1.235 V with 10 µA-20 mA reverse current. |
| 2 | - | passive | Anode (negative / ground-side terminal) of the band-gap reference diode. |
| 3 | DAP | passive | Die Attach Pad. Per the connection diagram note, pin 3 should be connected to pin 2 (Anode) or left floating; it is not a functional signal terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `LM385M3X-1.2`
- `LM385M3X-1.2M`
- `LM385M3X-1.2LP`
- `LM385M3X-1.2LPR`
- `LM385M3X-1.2LPX`
- `LM385M3X-1.2LPRX`
- `LM385M3X-1.2H`

## CAD (KiCad official)

- Symbol: `LM385M3X-1.2`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `lm385m3x-1-2-etched.step` / `lm385m3x-1-2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm385m3x-1-2.step` / `lm385m3x-1-2.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm385m3x-1.2.pdf) (28 pp, sha256 `733089279fec1712`, retrieved 2026-08-17, tier: manufacturer)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/lm385m3x-1-2-datasheet.pdf)