# REF2940AIDBZT

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

REF2940AIDBZT from Texas Instruments, in a SOT-23. 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 voltage; VIN must be at least VREF + 0.05 V and at most 5.5 V. |
| 2 | OUT | power_out | Reference output voltage, 4.096 V for the REF2940. |
| 3 | GND | power_in | Ground reference pin for the reference. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23 |
| 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 | VOUT | 4.014 | 4.096 | 4.178 | V |  | 5 |
| Initial accuracy |  |  |  | 2 | % |  | 5 |
| Output voltage noise f = 0.1 Hz to 10 Hz |  |  | 45 |  | µVPP | f = 0.1 Hz to 10 Hz | 5 |
| Voltage noise f = 10 Hz to 10 kHz |  |  | 128 |  | µVrms | f = 10 Hz to 10 kHz | 5 |
| Line regulation |  |  | 160 | 410 | µV/V | VREF + 50 mV ≤ VIN ≤ 5.5 V | 5 |
| Output voltage temperature drift | dVOUT/dT |  | 35 | 100 | ppm/°C | -40°C ≤ TA ≤ 125°C | 5 |
| Output current | ILOAD |  |  | 25 | mA |  | 5 |
| Long-term stability 0 to 1000 H |  |  | 24 |  | ppm | 0 to 1000 H | 5 |
| Long-term stability 1000 to 2000 H |  |  | 15 |  | ppm | 1000 to 2000 H | 5 |
| Load regulation | dVOUT/dILOAD |  | 3 | 100 | µV/mA | 0 mA < ILOAD < 25 mA, VIN = VREF + 500 mV | 5 |
| Thermal hysteresis | dT |  | 25 | 100 | ppm |  | 6 |
| Dropout voltage | VIN, VOUT |  | 1 | 50 | mV |  | 6 |
| Short-circuit current | ISC |  | 45 |  | mA |  | 6 |
| Turnon settling time |  |  | 120 |  | µs | to 0.1% at VIN = 5 V with CL = 0 | 6 |
| Supply voltage | VS |  |  | 5.5 | V | IL = 0 | 6 |
| Supply voltage over temperature | VS |  |  | 5.5 | V | -40°C ≤ TA ≤ 125°C | 6 |
| Quiescent current | IQ |  | 42 | 50 | µA |  | 6 |
| Quiescent current over temperature | IQ |  |  | 59 | µA | -40°C ≤ TA ≤ 125°C | 6 |
| Specified temperature range | TA | -40 |  | 125 | °C |  | 6 |
| Input voltage | VIN |  |  | 5.5 | V |  | 4 |
| Load current | ILOAD |  |  | 25 | mA |  | 4 |
| Operating temperature | TA | -40 |  | 125 | °C |  | 4 |
| Supply voltage V+ to V- |  |  |  | 7 | V |  | 4 |
| Lead temperature |  |  |  | 300 | °C | soldering, 10 s | 4 |
| Operating temperature |  | -40 |  | 125 | °C |  | 4 |
| Junction temperature |  |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Human-body model ESD | V(ESD) | -4000 |  | 4000 | V | HBM, per ANSI/ESDA/JEDEC JS-001 | 4 |
| Charged-device model ESD | V(ESD) | -1500 |  | 1500 | V | CDM, per JEDEC JESD22-C101 | 4 |
| Junction-to-ambient thermal resistance | RθJA |  | 297.3 |  | °C/W | DBZ (SOT-23) thermal information table | 4 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 128.5 |  | °C/W | DBZ (SOT-23) thermal information table | 4 |
| Junction-to-board thermal resistance | RθJB |  | 91.7 |  | °C/W | DBZ (SOT-23) thermal information table | 4 |
| Thermal resistance for SOT-23 surface-mount | RθJC |  | 110 |  | °C/W |  | 6 |
| Thermal resistance junction-to-ambient | RθJA |  | 336 |  | °C/W |  | 6 |

## CAD (KiCad official)

- Symbol: `REF2940AIDBZT`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ref2940aidbzt-etched.step` / `ref2940aidbzt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ref2940aidbzt.step` / `ref2940aidbzt.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/lit/ds/symlink/ref2940.pdf) (27 pp, sha256 `8ea634de078f1bc7`, retrieved 2026-11-05, tier: manufacturer)
- **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/ref2940aidbzt-datasheet.pdf)