# TL432BQDBZRQ1

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

TL432BQDBZRQ1 from Texas Instruments, in a SOT-23-3. 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 input pin; applies threshold voltage relative to ANODE with reference input current range of -50 µA to 10 mA. |
| 2 | CATHODE | bidirectional | Shunt regulator output/cathode pin; operating voltage from VREF (≈2.5V) to 36 V with continuous current range of -100 mA to 150 mA. |
| 3 | ANODE | power_in | Common pin (ground reference); typically connected to ground or die substrate; all voltages measured relative to this pin. |

## 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 | 2483 | 2495 | 2507 | mV | VKA = VREF, IKA = 10 mA, see Figure 20 | 5 |
| Deviation of reference voltage over full temperature | VI(DEV) |  | 14 | 34 | mV | VKA = VREF, IKA = 10 mA, TA = –40°C to 125°C, see Figure 20 | 5 |
| Ratio of change in reference voltage to change in cathode voltage (10 V to VREF) | ΔVREF/ΔVKA |  | -1.4 | -2.7 | mV/V | IKA = 10 mA, see Figure 21; ΔVKA = 10 V – VREF | 5 |
| Ratio of change in reference voltage to change in cathode voltage (36 V to 10 V) | ΔVREF/ΔVKA |  | -1 | -2 | mV/V | IKA = 10 mA, see Figure 21; ΔVKA = 36 V – 10 V | 5 |
| Reference current | IREF |  | 2 | 4 | µA | IKA = 10 mA, R1 = 10 kΩ, R2 = ∞, see Figure 21 | 5 |
| Deviation of reference current over full temperature | II(DEV) |  | 0.8 | 2.5 | µA | IKA = 10 mA, R1 = 10 kΩ, R2 = ∞, TA = –40°C to 125°C, see Figure 21 | 5 |
| Minimum cathode current for regulation | IMIN |  | 0.4 | 0.7 | mA | VKA = VREF, see Figure 20 | 5 |
| OFF-state cathode current | IOFF |  | 0.1 | 0.5 | µA | VKA = 36 V, VREF = 0, see Figure 22 | 5 |
| Dynamic impedance | /ZKA/ |  | 0.2 | 0.5 | Ω | IKA = 1 mA to 100 mA, VKA = VREF, f ≤ 1 kHz, see Figure 20 | 5 |
| Cathode voltage (recommended) | VKA |  |  | 36 | V |  | 4 |
| Cathode current (recommended) | IKA | 1 |  | 100 | mA |  | 4 |
| Operating free-air temperature | TA | -40 |  | 125 | °C |  | 4 |
| Cathode voltage | VKA |  |  | 37 | V | Voltage with respect to ANODE pin | 4 |
| Continuous cathode current | IKA | -100 |  | 150 | mA |  | 4 |
| Reference input current, low | IREF | -50 |  |  | µA |  | 4 |
| Reference input current, high | IREF |  |  | 10 | mA |  | 4 |
| Operating junction temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Junction-to-ambient thermal resistance (DBZ) | RθJA |  | 334.7 |  | °C/W |  | 4 |
| Junction-to-case (top) thermal resistance (DBZ) | RθJC(top) |  | 113.5 |  | °C/W |  | 4 |
| Junction-to-board thermal resistance (DBZ) | RθJB |  | 67.6 |  | °C/W |  | 4 |
| Junction-to-top characterization parameter (DBZ) | ψJT |  | 6.7 |  | °C/W |  | 4 |
| Junction-to-board characterization parameter (DBZ) | ψJB |  | 65.9 |  | °C/W |  | 4 |

## CAD (KiCad official)

- Symbol: `TL432BQDBZRQ1`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `tl432bqdbzrq1-etched.step` / `tl432bqdbzrq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl432bqdbzrq1.step` / `tl432bqdbzrq1.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/tl432-q1) (31 pp, sha256 `6e78e952a7d3e8bc`, retrieved 2026-09-21, 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 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/tl432bqdbzrq1-datasheet.pdf)