# REF3120AQDBZRQ1

**Texas Instruments** · Voltage Reference · SOT-23-3

REF3120AQDBZRQ1 from Texas Instruments, in a SOT-23-3. 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 | IN | power_in | Input supply pin; the datasheet's recommended input range is VREF + 0.05 V to 5.5 V, and the absolute maximum supply voltage is 7 V. |
| 2 | OUT | power_out | Voltage reference output, rated for ±10 mA output current (source and sink) with a short-circuit current of 50 mA source and 40 mA sink, and the datasheet states no output capacitor is required. |
| 3 | GND | power_in | Ground reference pin for the reference. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-3 |
| 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 |
|---|---|---|---|---|---|---|---|
| Output voltage (REF3120, 2.048 V) | VOUT | 2.0439 | 2.048 | 2.0521 | V | TA = 25°C, ILOAD = 0mA, VIN = 5V | 5 |
| Initial accuracy |  | -0.2 |  | 0.2 | % | TA = 25°C, ILOAD = 0mA, VIN = 5V | 5 |
| Output voltage noise, 0.1 Hz to 10 Hz |  |  | 27 |  | μVPP | f = 0.1Hz to 10Hz | 5 |
| Output voltage noise, 10 Hz to 10 kHz |  |  | 39 |  | μVRMS | f = 10Hz to 10kHz | 5 |
| Output voltage temperature drift, 0°C to 70°C | dVOUT/dT |  | 5 | 15 | ppm/°C | TA = 0°C to 70°C | 5 |
| Output voltage temperature drift, -40°C to +125°C | dVOUT/dT |  | 10 | 20 | ppm/°C | TA = –40°C to +125°C | 5 |
| Line regulation |  |  | 20 | 65 | ppm/V | VREF + 0.05 ≤ VIN ≤ 5.5 V | 5 |
| Load regulation, sourcing | dVOUT/dILOAD |  | 10 | 30 | µV/mA | 0mA < ILOAD < 10mA, VIN = VREF + 250mV | 5 |
| Load regulation, sinking | dVOUT/dILOAD |  | 20 | 50 | µV/mA | -10mA < ILOAD < 0mA, VIN = VREF + 100mV | 5 |
| Thermal hysteresis, first cycle | dT |  | 100 |  | ppm | First cycle | 5 |
| Thermal hysteresis, additional cycles | dT |  | 25 |  | ppm | Additional cycles | 5 |
| Long-term stability |  |  | 70 |  | ppm | 0 to 1000 hours | 5 |
| Dropout voltage (VIN - VOUT) | VIN - VOUT |  | 5 | 50 | mV | TA = –40°C to +125°C | 5 |
| Output current | ILOAD | -10 |  | 10 | mA |  | 5 |
| Short-circuit current, sourcing | ISC |  | 50 |  | mA | Sourcing | 5 |
| Short-circuit current, sinking | ISC |  | 40 |  | mA | Sinking | 5 |
| Turn-on settling time |  |  | 400 |  | µs | VIN = +5V, CL = 0μF, to 0.1% accuracy | 5 |
| Supply voltage (VS) | VS |  |  | 5.5 | V | ILOAD = 0, TA = –40°C to +125°C; minimum printed as VREF + 0.05 | 5 |
| Quiescent current at 25°C | IQ |  | 100 | 115 | µA | ILOAD = 0, TA = 25°C | 6 |
| Quiescent current over temperature | IQ |  | 115 | 135 | µA | ILOAD = 0, TA = –40°C to +125°C | 6 |
| Supply voltage, V+ to V- | V+ - V- |  |  | 7 | V |  | 4 |
| Operating temperature (absolute maximum) |  | -55 |  | 135 | °C | Natural ventilation | 4 |
| Junction temperature |  |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| ESD, human body model (HBM) | V(ESD) | -2000 |  | 2000 | V | ANSI/ESDA/JEDEC JS-001 | 4 |
| ESD, charged device model (CDM) | V(ESD) | -1000 |  | 1000 | V | JEDEC JESD22-C101 | 4 |
| Input voltage VIN | VIN |  |  | 5.5 | V | Minimum printed as VREF + 0.05 | 4 |
| Load current | ILOAD |  |  | 25 | mA |  | 4 |
| Operating temperature | TA | -40 |  | 125 | °C |  | 4 |
| Junction-to-ambient thermal resistance (DBZ) | RθJA |  | 292.9 |  | °C/W | DBZ (SOT-23), 3 pins | 4 |
| Junction-to-case (top) thermal resistance (DBZ) | RθJC(top) |  | 124.4 |  | °C/W | DBZ (SOT-23), 3 pins | 4 |
| Junction-to-board thermal resistance (DBZ) | RθJB |  | 89 |  | °C/W | DBZ (SOT-23), 3 pins | 4 |
| Junction-to-top characterization parameter (DBZ) | ψJT |  | 11.4 |  | °C/W | DBZ (SOT-23), 3 pins | 4 |
| Junction-to-board characterization parameter (DBZ) | ψJB |  | 87.6 |  | °C/W | DBZ (SOT-23), 3 pins | 4 |

## CAD (KiCad official)

- Symbol: `REF3120AQDBZRQ1`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `ref3120aqdbzrq1-etched.step` / `ref3120aqdbzrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ref3120aqdbzrq1.step` / `ref3120aqdbzrq1.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/ref31-q1) (27 pp, sha256 `03980e8e34baffa1`, retrieved 2026-10-11, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/ref3120aqdbzrq1-datasheet.pdf)