# LM285BYZ

**Texas Instruments** · Voltage Reference · TO-92-3

LM285BYZ from Texas Instruments, in a TO-92-3. 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 | - | power_in | Anode (negative) terminal of the shunt reference, the ground return, with reverse current of 10µA to 20mA operating and 30mA absolute maximum. |
| 2 | + | passive | Positive (cathode) terminal of the shunt reference that sets VOUT adjustable from 1.24V to 5.30V, with 30mA maximum reverse current. |
| 3 | FB | input | Feedback input that sets the output voltage via an external divider, with feedback current of 13nA typical for the LM285BY. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TO-92-3 |
| 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 (tested limits, BY grade) | VREF | 1.215 | 1.24 | 1.265 | V | IR = 100μA | 4 |
| Reference Voltage Change with Current (tested, BY) |  |  |  | 1 | mV | IMIN < IR < 1mA | 4 |
| Reference Voltage Change with Current (tested, BY) |  |  |  | 10 | mV | 1mA < IR < 20mA | 4 |
| Reference Voltage Change with Output Voltage (tested, BY) |  |  |  | 3 | mV | IR = 100μA | 4 |
| Minimum Operating Current (tested, BY) |  |  |  | 9 | μA | VOUT = VREF | 4 |
| Minimum Operating Current (tested, BY) |  |  |  | 45 | μA | VOUT = 5.3V | 4 |
| Feedback Current (tested, BY) |  |  |  | 20 | nA |  | 4 |
| Average Temperature Coefficient (Y suffix) |  |  |  | 50 | ppm/°c | Y Suffix; TMIN to TMAX per note (4) | 4 |
| Dynamic Output Impedance |  |  | 0.3 | 0.4 | Ω | IR = 100μA, f = 100Hz, IAC = 0.1 IR, VOUT = VREF | 4 |
| Dynamic Output Impedance |  |  | 0.7 | 1 | Ω | IR = 100μA, f = 100Hz, IAC = 0.1 IR, VOUT = 5.3V | 4 |
| Reverse Current |  |  |  | 30 | mA |  | 3 |
| Forward Current |  |  |  | 10 | mA |  | 3 |
| ESD Susceptibility |  |  |  | 2 | kV | Human body model, 100 pF through 1.5 kΩ | 3 |
| Storage Temperature |  | -55 |  | 150 | °C |  | 3 |
| Soldering Temperature (TO-92 package) |  |  |  | 260 | °C | TO-92 package, 10 sec. | 3 |
| Operating Temperature Range (LM285 Series) |  | -40 |  | 85 | °C | LM285 Series | 3 |
| Operating Current |  | 10 |  |  | μA | Features: operating current range | 1 |
| Operating Current |  |  |  | 20 | mA | Features: operating current range | 1 |
| Adjustable Output Voltage Range | VOUT | 1.24 |  | 5.3 | V | Features: adjustable range | 1 |
| Maximum Junction Temperature (LM285, elevated temperature operation) | TJ(max) |  |  | 125 | °C | Table 1, elevated temperature operation | 3 |
| Thermal Resistance Junction to Ambient (TO-92, 0.4in leads) | θJA |  | 180 |  | °C/W | 0.4in leads | 3 |
| Thermal Resistance Junction to Ambient (TO-92, 0.125in leads) | θJA |  | 170 |  | °C/W | 0.125in leads | 3 |

## CAD (KiCad official)

- Symbol: `LM285BYZ`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92-3 (KiCad packages3D, STEP)
- 3D model files: `lm285byz-etched.step` / `lm285byz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm285byz.step` / `lm285byz.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/lm285byz-datasheet.pdf)