Texas Instruments TL432BQPK

Overview

TL432BQPK from Texas Instruments is a precision programmable shunt voltage reference in SOT-89 package, featuring 0.5% initial reference voltage tolerance at 25°C, −40°C to +125°C operating temperature range, and 0.2Ω typical dynamic impedance. It delivers stable 2.483–2.507V reference output with ≤34mV total deviation over temperature and supports sink-current regulation from 1mA to 100mA in industrial power supply feedback loops.

For engineers reviewing the TL432BQPK datasheet, TL432BQPK pinout, TL432BQPK application, or TL432BQPK equivalent, this page provides verified electrical specifications, thermal performance data, automotive-grade temperature stability metrics, and real-world implementation guidance for closed-loop voltage regulation in high-reliability power systems.

Technical Context

The TL432BQPK implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference cell, and NPN output stage. Its REF pin senses voltage relative to ANODE, enabling precise feedback control via external resistor dividers across cathode and anode terminals.

Unlike TL431 variants, TL432BQPK uses a distinct pinout (REF–ANODE–CATHODE–ANODE) optimized for SOT-89 thermal performance and layout compatibility in space-constrained power rails. It shares identical electrical specs with TL431BQ but requires PCB redesign due to non-pin-compatible terminal mapping.

Key Specifications

Pinout & Package

SOT-89 package with 3.0mm × 4.5mm body, 1.8mm height, and exposed thermal pad for enhanced heat dissipation in high-current regulation scenarios.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt reference applications.

Compared with TL431BQDBVR, TL432BQPK offers superior thermal performance and higher current capability in SOT-89, while TLVH431BQDBVR serves fundamentally different low-voltage use cases-neither is pin-compatible, but both provide Q-temp reliability for automotive-qualified designs.

Availability

TL432BQPK is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL432BQPK includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision voltage references and power management ICs.

The TL43x family was engineered for high-stability shunt regulation in safety-critical power systems, targeting automotive, industrial, and computing applications where reference accuracy and thermal robustness are non-negotiable.

FAQ

What is the exact pin configuration of TL432BQPK?

The TL432BQPK uses a 4-pin SOT-89 package with pins arranged as REF (1), ANODE (2), CATHODE (3), and ANODE (4). Pins 2 and 4 are internally connected to the substrate and serve as common return paths-both must be tied to system ground or left unconnected per layout requirements. This differs from TL431's pinout and requires dedicated PCB footprint design.

How does TL432BQPK differ from TL431BQPK?

TL432BQPK and TL431BQPK share identical electrical specifications-including 0.5% reference tolerance, −40°C to +125°C operation, and 0.2Ω dynamic impedance-but TL432BQPK features a modified pinout (REF–ANODE–CATHODE–ANODE) optimized for thermal performance in SOT-89. TL431BQPK uses REF–CATHODE–ANODE mapping, making them functionally equivalent but not pin-compatible.

What is the maximum power dissipation capability of TL432BQPK?

TL432BQPK has a junction-to-ambient thermal resistance (RθJA) of 52°C/W in SOT-89 package. At 85°C ambient, it can safely dissipate up to 1.25W (calculated as (150°C − 85°C)/52°C/W) before reaching its 150°C maximum junction temperature-sufficient for 100mA sink current at 12.5V cathode-anode differential.

Can TL432BQPK replace a Zener diode in existing designs?

Yes, TL432BQPK can directly replace Zener diodes in voltage regulation and overvoltage protection circuits. Its sharp turn-on characteristic, 0.5% accuracy, and adjustable 2.5–36V output eliminate Zener tolerance stacking and temperature drift issues-though external resistor divider design and PCB layout must follow TI's stability guidelines to prevent oscillation.

Is TL432BQPK qualified for automotive applications?

Yes, TL432BQPK carries Q-temp qualification (−40°C to +125°C operating range) and meets AEC-Q100 stress test requirements for automotive use. It is deployed in engine control units, battery management systems, and ADAS power supplies where reference stability under thermal cycling and vibration is critical-TI provides PPAP documentation upon request.