# TLV431BQLPR

**Texas Instruments** · Voltage Reference · TO-92-3

TLV431BQLPR from Texas Instruments, in a TO-92-3. 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 | CATHODE | bidirectional | Shunt current/voltage input; recommended cathode current is 0.1 mA to 15 mA, and absolute maximum continuous cathode current is -20 mA to 20 mA. |
| 2 | ANODE | power_in | Common pin, normally connected to ground; all cathode voltage ratings are referenced to the anode terminal. |
| 3 | REF | input | Threshold input relative to the common anode, set by the external divider; reference current is limited to -0.05 mA to 3 mA absolute maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TO-92-3 |
| 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 | 1.221 |  | 1.265 | V | VKA = VREF, IK=10mA, TA = full range (see Figure 6-1), TLV431BQ | 7 |
| Reference voltage | VREF | 1.234 | 1.24 | 1.246 | V | VKA = VREF, IK=10mA, TA = 25°C | 7 |
| VREF deviation over full temperature range | VREF(dev) |  | 11 | 31 | mV | VKA = VREF, IK = 10mA (see Figure 6-1), TLV431BQ | 7 |
| Ratio of VREF change to cathode voltage change |  |  | -1.5 | -2.7 | mV/V | VKA = VREF to 6V, IK = 10mA (see Figure 6-2) | 7 |
| Reference terminal current | Iref |  | 0.1 | 0.5 | µA | IK = 10mA, R1 = 10kΩ, R2 = open (see Figure 6-2) | 7 |
| Iref deviation over full temperature range | Iref(dev) |  | 0.15 | 0.5 | µA | IK = 10mA, R1 = 10kΩ, R2 = open (see Figure 6-2), TLV431BQ | 7 |
| Minimum cathode current for regulation | IK(min) |  | 55 | 100 | µA | VKA = VREF (see Figure 6-1) | 7 |
| Off-state cathode current | IK(off) |  | 0.001 | 0.1 | µA | VREF = 0, VKA = 6V (see Figure 6-3) | 7 |
| Dynamic impedance | /zKA/ |  | 0.25 | 0.4 | Ω | VKA = VREF, f ≤ 1kHz, IK = 0.1mA to 15mA (see Figure 6-1) | 7 |
| Cathode voltage | VKA |  |  | 7 | V | Voltage with respect to anode terminal | 4 |
| Continuous cathode current | IK | -20 |  | 20 | mA |  | 4 |
| Reference current | Iref | -0.05 |  | 3 | mA |  | 4 |
| Operating virtual junction temperature |  |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Cathode voltage | VKA |  |  | 6 | V | Minimum is VREF (1.24 V) | 4 |
| Cathode current | IK | 0.1 |  | 15 | mA |  | 4 |
| Operating free-air temperature | TA | -40 |  | 125 | °C | TLV431_Q | 4 |
| Junction-to-ambient thermal resistance | RθJA |  | 140 |  | °C/W | LP (TO-92, 3) package | 4 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 55 |  | °C/W | LP (TO-92, 3) package | 4 |

## CAD (KiCad official)

- Symbol: `TLV431BQLPR`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92-3 (KiCad packages3D, STEP)
- 3D model files: `tlv431bqlpr-etched.step` / `tlv431bqlpr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tlv431bqlpr.step` / `tlv431bqlpr.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/tlv431b.pdf) (58 pp, sha256 `6999c7cde8d7d768`, 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/tlv431bqlpr-datasheet.pdf)