# REF02BU

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

REF02BU 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 floating. |
| 2 | VIN | power_in | Supply input, specified for 8V to 40V with absolute maximum input voltage of +40V. |
| 3 | Temp | output | Temperature voltage output, typically 630mV with a 2.1mV/°C temperature coefficient; it is insensitive to capacitive loading but shifts 7mV per µA of load current. |
| 4 | GND | power_in | Ground reference for the supply, output and trim network. |
| 5 | Trim | input | Output adjustment input; a 10kΩ potentiometer from VOUT to ground with its wiper here gives an output adjustment range of ±6%, with minimal effect on temperature coefficient. |
| 6 | VOUT | power_out | Precision 5V reference output, 4.990V to 5.010V for REF02B at 0mA load, short-circuit protected. |
| 7 | NC | unconnected | No internal connection; leave floating. |
| 8 | NC | unconnected | No internal connection; leave floating. |

## 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 |
|---|---|---|---|---|---|---|---|
| Output voltage (ILOAD = 0mA) |  | 4.99 | 5 | 5.01 | V | ILOAD = 0mA | 2 |
| Change with Temperature (∆VOT), –40°C to +85°C | ∆VOT |  | 0.05 | 0.13 | % | –40°C to +85°C | 2 |
| Output voltage drift (TCVO), –40°C to +85°C | TCVO | -10 | 4 | 10 | ppm/°C | –40°C to +85°C | 2 |
| Long-term stability, first 1000h |  | -100 |  | 100 | ppm | 2000h Test, first 1000h | 2 |
| Long-term stability, second 1000h |  | -50 |  | 50 | ppm | 2000h Test, second 1000h | 2 |
| Output adjustment range |  | -6 |  | 6 | % | RPOT = 10kΩ | 2 |
| Output voltage noise |  |  | 4 | 10 | µVPP | 0.1Hz to 10Hz | 2 |
| Line regulation |  |  | 0.006 | 0.01 | %/V | VIN = 8V to 33V | 2 |
| Line regulation, –40°C to +85°C |  |  | 0.008 | 0.012 | %/V | –40°C to +85°C, VIN = 8.5V to 33V | 2 |
| Load regulation |  |  | 0.005 | 0.008 | %/mA | IL = 0mA to +10mA | 2 |
| Load regulation, –40°C to +85°C |  |  | 0.007 | 0.01 | %/mA | –40°C to +85°C, IL = 0mA to +10mA | 2 |
| Quiescent current |  |  | 1 | 1.4 | mA | No Load | 2 |
| Load current (source) |  | 10 | 21 |  | mA |  | 2 |
| Load current (sink) |  | -0.3 | -0.5 |  | mA |  | 2 |
| Power dissipation |  |  | 15 | 21 | mW | No Load | 2 |
| Temperature range specification |  | -40 |  | 85 | °C |  | 2 |
| Input voltage |  |  |  | 40 | V |  | 3 |
| Operating temperature (P, U) |  | -40 |  | 85 | °C |  | 3 |
| Input supply voltage range (wide supply range) |  | 8 |  | 40 | V |  | 1 |
| Storage temperature range (P, U) |  | -65 |  | 125 | °C |  | 3 |
| Junction temperature |  | -65 |  | 150 | °C |  | 3 |
| Lead temperature |  |  |  | 300 | °C | Soldering, 60s | 3 |
| Junction-to-ambient thermal resistance (θJA) | θJA |  | 80 |  | °C/W | U package (SO-8) | 3 |

## CAD (KiCad official)

- Symbol: `REF02BU`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `ref02bu-etched.step` / `ref02bu-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ref02bu.step` / `ref02bu.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/ref02) (16 pp, sha256 `38c5d699f22a6003`, retrieved 2026-10-11, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/ref02bu-datasheet.pdf)