# LM285MX

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

LM285MX 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; leave unconnected or tie to ground per board layout. |
| 2 | − | power_in | Cathode / negative terminal; ground-side return path for the shunt reference current; connect to circuit ground. |
| 3 | NC | unconnected | No internal connection; leave unconnected or tie to ground per board layout. |
| 4 | NC | unconnected | No internal connection; leave unconnected or tie to ground per board layout. |
| 5 | NC | unconnected | No internal connection; leave unconnected or tie to ground per board layout. |
| 6 | FB | input | Feedback / adjust pin; output voltage set by external resistor divider connected here; feedback current 13 nA typ, 35 nA max (25 °C, LM285). |
| 7 | NC | unconnected | No internal connection; leave unconnected or tie to ground per board layout. |
| 8 | + | power_out | Anode / positive terminal; regulated reference voltage output, adjustable 1.24 V to 5.30 V at 10 μA to 20 mA operating current, 1 Ω dynamic impedance typ. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reverse Current |  |  |  | 30 | mA |  | 3 |
| Forward Current |  |  |  | 10 | mA |  | 3 |
| Operating Temperature Range (LM285 Series) |  | -40 |  | 85 | °C | LM285 series, per Absolute Maximum Ratings | 3 |
| ESD Susceptibility |  |  |  | 2 | kV | Human body model, 100 pF through 1.5 kΩ | 3 |
| Storage Temperature |  | -55 |  | 150 | °C |  | 3 |
| Soldering, SOIC vapor phase |  |  |  | 215 | °C | Vapor phase, 60 sec | 3 |
| Soldering, SOIC infrared |  |  |  | 220 | °C | Infrared, 15 sec | 3 |
| Maximum junction temperature, LM285 elevated operation | TJ(max) |  |  | 125 | °C | Elevated temperature operation (Table 1) | 3 |
| Thermal resistance junction to ambient, SOIC | θJA |  | 165 |  | °C/W | Over operating free-air temperature range | 3 |
| Average Temperature Coefficient, all others (not X or Y suffix) |  |  |  | 150 | ppm/°C | Footnote 4: max deviation from TMIN to TMAX divided by TMAX − TMIN | 4 |

## CAD (KiCad official)

- Symbol: `LM285MX`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `lm285mx-etched.step` / `lm285mx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm285mx.step` / `lm285mx.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-adj) (27 pp, sha256 `0dc47d98ca08aa27`, retrieved 2026-10-21, 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-datasheet.pdf)