# LM285MX-1.2

**Texas Instruments** · Voltage Reference · SOIC-8

LM285MX-1.2 from Texas Instruments, in a SOIC-8. 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 | NC | unconnected | No internal connection; not connected to the die per the SOIC connection diagram. |
| 2 | NC | unconnected | No internal connection; not connected to the die per the SOIC connection diagram. |
| 3 | NC | unconnected | No internal connection; not connected to the die per the SOIC connection diagram. |
| 4 | - | passive | Negative (anode) terminal of the 2-terminal band-gap voltage reference diode, the low side of the reverse-breakdown voltage measured to pin 8. |
| 5 | NC | unconnected | No internal connection; not connected to the die per the SOIC connection diagram. |
| 6 | NC | unconnected | No internal connection; not connected to the die per the SOIC connection diagram. |
| 7 | NC | unconnected | No internal connection; not connected to the die per the SOIC connection diagram. |
| 8 | + | passive | Positive (cathode) terminal of the 2-terminal band-gap voltage reference diode; operated in reverse breakdown over 10μA to 20mA with a nominal 1.235V (1.223V-1.247V) drop to pin 4. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM285MX-1.2`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `lm285mx-1-2-etched.step` / `lm285mx-1-2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm285mx-1-2.step` / `lm285mx-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/cn/lit/gpn/lm385-1.2-n) (30 pp, sha256 `f069722c4b8202b3`, retrieved 2026-09-29, tier: lcsc)
- **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/lm285mx-1-2-datasheet.pdf)