# TL432U

**CBI** · Voltage Reference · SOT-89

TL432U from CBI, in a SOT-89. 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 | REFERENCE | input | Reference input terminal, with a reference input current range of 6 μA as stated in the absolute maximum ratings. |
| 2 | ANODE | passive | Anode terminal of the shunt reference; the datasheet gives no separate electrical limit for this pin. |
| 3 | CATHODE | passive | Cathode terminal, rated for a cathode voltage of 18 V and a continuous cathode current range of 100 mA in the absolute maximum ratings. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | CBI |
| Package | SOT-89 |
| 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 input voltage | Vref | 1.2214 |  | 1.2586 | V | VKA=VREF, IKA=10mA | 2 |
| Deviation of reference voltage over full temperature range | Vref(DEV) |  |  | 16 | mV | VKA=VREF, IKA=10mA, 0℃≤Ta≤70℃ | 2 |
| Ratio of change in reference input voltage to the change in cathode voltage | ΔVref/ΔVKA |  |  | 2.4 | mV/V | IKA=10mA, ΔVKA=1.25V~15V | 2 |
| Deviation of reference input current over full temperature range | Iref(DEV) |  |  | 0.6 | μA | IKA=10mA, R1=10kΩ, R2=∞, 0℃≤Ta≤70℃ | 2 |
| Minimum cathode current for regulation | IKA(min) | 0.1 |  |  | mA |  | 2 |
| Off-state cathode current | Ioff |  |  | 0.5 | μA | VKA=15V, VREF=0 | 2 |
| Dynamic impedance | ZKA |  |  | 0.5 | Ω | VKA=VREF, IKA=0.1~20mA, f≤1.0kHz | 2 |
| Cathode Voltage | VKA |  |  | 18 | V |  | 1 |
| Cathode Current Range (continuous) | IKA |  |  | 100 | mA |  | 1 |
| Reference Input Current Range | Iref |  |  | 6 | μA |  | 1 |
| Power Dissipation | PD |  |  | 350 | mW |  | 1 |
| Thermal Resistance from Junction to Ambient | RθJA |  |  | 357 | ℃/W |  | 1 |
| Operating Temperature | Topr |  |  | 70 | ℃ |  | 1 |
| Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | Tstg | -65 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `TL432U`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `tl432u-etched.step` / `tl432u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tl432u.step` / `tl432u.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [CBI datasheet](docs/tl432u-datasheet.pdf) (5 pp, sha256 `0ae298b3a6333be9`, retrieved 2026-10-27, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `off` (skipped (clean text read)), 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/tl432u-datasheet.pdf)