# TLV431BFTA

**Diodes Incorporated** · Voltage Reference · SOT-23

TLV431BFTA from Diodes Incorporated, 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 | REF | input | Reference (feedback) input. High-impedance sense pin of the internal error amplifier; compared against the internal 1.24V bandgap VREF. The external R1/R2 divider from CATHODE to ANODE ties into this pin to program VKA = VREF x (1 + R1/R2). Typical input bias current 0.15 uA (0.5 uA max). |
| 2 | ANODE | power_in | Anode (return / ground) terminal. Common negative rail of the internal shunt element; all internal voltages are referenced to this pin. In a standard shunt-regulator topology this connects to system GND. |
| 3 | CATHODE | power_out | Cathode (regulated) terminal. Drain of the internal shunt output transistor; sinks current from VIN through the external series resistor R3 to maintain VKA at the programmed setpoint. Absolute max VKA = 20V, continuous IKA = -20 to +20 mA, minimum cathode current for regulation approximately 55 uA typ (80 uA max). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-23 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `TLV431BFTAAFTA`
- `TLV431BFTA`
- `TLV431BFTATFTA`
- `TLV431BFTAAE5TA`
- `TLV431BFTABE5TA`
- `TLV431BFTAAH6TA`
- `TLV431BFTABH6TA`

## CAD (KiCad official)

- Symbol: `TLV431BFTA`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `tlv431bfta-etched.step` / `tlv431bfta-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tlv431bfta.step` / `tlv431bfta.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/assets/Datasheets/TLV431BFTA.pdf) (17 pp, sha256 `bfc6983112ce20da`, 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/tlv431bfta-datasheet.pdf)