# TLVH431QDBZT

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

TLVH431QDBZT 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 | REF | input | Threshold input referenced to the common anode; it sets the output voltage, with VREF of 1.24V (typical) fixing the regulation point. |
| 2 | CATHODE | bidirectional | Shunt current/voltage terminal, which carries the regulated cathode current (0.1 mA to 70 mA continuous, per the recommended operating conditions). |
| 3 | ANODE | power_in | Common pin, normally connected to ground, and the reference for the cathode voltage and absolute maximum ratings. |

## 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 |
|---|---|---|---|---|---|---|---|
| Reference voltage | VREF | 1.222 | 1.24 | 1.258 | V | VKA = VREF, IK = 10mA, TA = 25°C | 6 |
| Reference voltage over full temperature range (Q grade) | VREF | 1.194 |  | 1.286 | V | VKA = VREF, IK = 10mA, TA = full range, See Figure 6-1 | 6 |
| VREF deviation over full temperature range (Q grade) | VREF(dev) |  | 11 | 31 | mV | VKA = VREF, IK = 10mA, See Figure 6-1, full range -40°C to +125°C | 6 |
| Ratio of VREF change to cathode voltage change | VREF/VKA |  | -1.5 | -2.7 | mV/V | IK = 10mA, VK = VREF to 18V, See Figure 6-2 | 6 |
| Reference terminal current | Iref |  | 0.1 | 0.5 | μA | IK = 10mA, R1 = 10kΩ, R2 = open, See Figure 6-2 | 6 |
| Iref deviation over full temperature range (Q grade) | Iref(dev) |  | 0.15 | 0.5 | μA | IK = 10mA, R1 = 10kΩ, R2 = open, See Figure 6-2, full range | 6 |
| Minimum cathode current for regulation | IK(min) |  | 60 | 100 | μA | VKA = VREF, See Figure 6-1 | 6 |
| Off-state cathode current | IK(off) |  | 0.02 | 0.1 | μA | VREF = 0, VKA = 18V, See Figure 6-3 | 6 |
| Dynamic impedance | /zKA/ |  | 0.25 | 0.4 | Ω | VKA = VREF, f ≤ 1kHz, IK = 0.1mA to 70mA, See Figure 6-1 | 6 |
| Cathode voltage (absolute maximum) | VKA |  |  | 20 | V | Voltage with respect to anode | 5 |
| Cathode current (absolute maximum) | IK | -25 |  | 80 | mA |  | 5 |
| Reference current (absolute maximum) | Iref | -0.05 |  | 3 | mA |  | 5 |
| Operating virtual junction temperature (absolute maximum) | TJ |  |  | 150 | °C |  | 5 |
| Storage temperature (absolute maximum) | Tstg | -65 |  | 150 | °C |  | 5 |
| Cathode voltage (recommended operating) | VKA |  |  | 18 | V | Minimum is VREF (not numeric) | 5 |
| Cathode current continuous (recommended operating) | IK | 0.1 |  | 70 | mA | Continuous | 5 |
| Operating free-air temperature (Q grade) | TA | -40 |  | 125 | °C | TLVH43x_Q | 5 |
| Junction-to-ambient thermal resistance (DBZ) | RθJA |  | 206 |  | °C/W | DBZ (SOT-23, 3 pins) | 5 |
| Junction-to-case (top) thermal resistance (DBZ) | RθJC(top) |  | 76 |  | °C/W | DBZ (SOT-23, 3 pins) | 5 |

## CAD (KiCad official)

- Symbol: `TLVH431QDBZT`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `tlvh431qdbzt-etched.step` / `tlvh431qdbzt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tlvh431qdbzt.step` / `tlvh431qdbzt.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/tlvh431.pdf) (58 pp, sha256 `e30d628cb6475d48`, 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/tlvh431qdbzt-datasheet.pdf)