# REF3112AIDBZR

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

REF3112AIDBZR 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 | IN | power_in | Input supply voltage. Operating range VREF + 0.05 V to 5.5 V (minimum supply for REF3112 is 1.8 V). Absolute maximum supply V+ to V- is 7 V. |
| 2 | OUT | output | Reference output voltage (1.25 V nominal for REF3112, initial accuracy ±0.2%). Can source or sink up to ±10 mA; no output capacitor required and stable with any capacitive load. |
| 3 | GND | power_in | Ground return for the reference. Quiescent current is 115 µA max. |

## Key specifications

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

## Ordering variants

Same part, different packaging or reel option.

- `REF3112AIDBZR`
- `REF3112AIDBZT`

## 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 (REF3112 row) | VOUT | 1.2475 | 1.25 | 1.2525 | V |  | 4 |
| Initial accuracy |  | -0.2 |  | 0.2 | % |  | 4 |
| Output voltage temperature drift | dVOUT/dT |  | 5 | 15 | ppm/°C | TA = 0°C to 70°C. | 5 |
| Output voltage temperature drift | dVOUT/dT |  | 10 | 20 | ppm/°C | TA = –40°C to +125°C. | 5 |
| Line regulation |  |  | 20 | 65 | ppm/V | VREF + 0.05(1) ≤ VIN ≤ 5.5V | 5 |
| Load regulation, sourcing | dVOUT/dILOAD |  | 10 | 30 | µV/mA | Sourcing 0mA < ILOAD < 10mA, VIN = VREF + 250mV(1) | 5 |
| Load regulation, sinking | dVOUT/dILOAD |  | 20 | 50 | µV/mA | Sinking –10mA < ILOAD < 0mA, VIN = VREF + 100mV(1) | 5 |
| Dropout voltage | VIN – VOUT |  | 5 | 50 | mV | TA = –40°C to +125°C. | 5 |
| Output current | ILOAD | -10 |  | 10 | mA |  | 5 |
| Quiescent current | IQ |  | 100 | 115 | µA | ILOAD = 0, TA = 25°C | 5 |
| Quiescent current | IQ |  | 115 | 135 | µA | ILOAD = 0, TA = –40°C to +125°C | 5 |
| Input voltage | VIN | 1.8 |  | 5.5 | V |  | 4 |
| Load current | ILOAD |  |  | 25 | mA |  | 4 |
| Operating temperature (recommended) | TA | -40 |  | 125 | °C |  | 4 |
| Supply voltage, V+ to V– |  |  |  | 7 | V |  | 4 |
| Operating temperature (absolute maximum) |  | -55 |  | 135 | °C |  | 4 |
| Junction temperature |  |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Junction-to-ambient thermal resistance | RθJA |  | 292.9 |  | °C/W |  | 4 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 124.4 |  | °C/W |  | 4 |
| Junction-to-board thermal resistance | RθJB |  | 89 |  | °C/W |  | 4 |
| Junction-to-top characterization parameter | ψJT |  | 11.4 |  | °C/W |  | 4 |
| Junction-to-board characterization parameter | ψJB |  | 87.6 |  | °C/W |  | 4 |

## CAD (KiCad official)

- Symbol: `REF3112AIDBZR`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ref3112aidbzr-etched.step` / `ref3112aidbzr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ref3112aidbzr.step` / `ref3112aidbzr.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`ref3112aidbzr.step`](ref3112aidbzr.step) | 59 KB | You want the bare part, or you mark your own boards. |
| [`ref3112aidbzr-etched.step`](ref3112aidbzr-etched.step) | 1.9 MB | You want the part with `REF3112AIDBZR` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 502 faces against 69 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/ref3112aidbzr.pdf) (28 pp, sha256 `c8d0e0159b24942b`, 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/ref3112aidbzr-datasheet.pdf)