Texas Instruments TL432BQDBVRG4

Overview

TL432BQDBVRG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 0.5% initial tolerance at 25°C, 2.483–2.507 V reference voltage, and operation across –40°C to 125°C. It delivers 0.2 Ω typical dynamic impedance, supports 1–100 mA sink current, and serves as a Zener diode replacement in secondary-side regulation of automotive-grade flyback SMPSs.

For engineers reviewing the TL432BQDBVRG4 datasheet, TL432BQDBVRG4 pinout, TL432BQDBVRG4 application, or TL432BQDBVRG4 equivalent, key selection criteria include its Q-grade temperature range, B-grade accuracy, SOT-23-3 footprint, cathode-anode-reference terminal configuration, and compatibility with adjustable voltage/current referencing circuits requiring high thermal stability.

Technical Context

The TL432BQDBVRG4 implements a three-terminal adjustable shunt regulator architecture with an internal precision reference amplifier and NPN output stage. Its sharp turn-on characteristic and low 0.2 Ω dynamic impedance enable stable regulation under varying load and line conditions.

Unlike the TL431, the TL432BQDBVRG4 uses a distinct pinout (CATHODE–REF–ANODE) in the SOT-23-3 package and is qualified for automotive applications per AEC-Q100 with full-spec operation from –40°C to 125°C. It maintains ≤34 mV total reference voltage deviation over that range and draws only 2–4 µA reference input current.

Key Specifications

Pinout & Package

SOT-23-3 package (2.90 mm × 1.30 mm body), surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431BQDBVRG4, TL432BQDBVRG4 offers identical performance in a pinout-optimized package for new designs, while TL432BIYFPR trades temperature range and accuracy for cost reduction in non-automotive applications.

Availability

TL432BQDBVRG4 is available at Aetrix Electronics and suitable for automotive power conversion, industrial voltage monitoring, and precision current sourcing requiring stable component supply across extended temperature ranges.

Supply support for TL432BQDBVRG4 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and automotive-qualified components.

The TL43x family was designed specifically for high-stability shunt reference applications in power supplies, voltage monitors, and feedback control systems where accuracy, temperature resilience, and reliability are critical.

FAQ

What is the pin configuration of TL432BQDBVRG4?

The TL432BQDBVRG4 uses a SOT-23-3 package with pin 1 = CATHODE, pin 2 = REF, and pin 3 = ANODE. This differs from the TL431's REF–CATHODE–ANODE order and must be accounted for during PCB layout. The device requires no external components to operate as a basic shunt reference, though resistive dividers are used to set output voltage.

How does TL432BQDBVRG4 differ from TL431BQDBVRG4?

The TL432BQDBVRG4 and TL431BQDBVRG4 share identical electrical specifications, temperature rating (–40°C to 125°C), and accuracy (0.5% B grade), but feature opposite pinouts in the SOT-23-3 package. TL432BQDBVRG4 is CATHODE–REF–ANODE; TL431BQDBVRG4 is REF–CATHODE–ANODE. They are not pin-compatible and require separate footprints.

What is the maximum cathode voltage rating for TL432BQDBVRG4?

The absolute maximum cathode-to-anode voltage (VKA) for TL432BQDBVRG4 is 37 V, with recommended operating range from Vref (≈2.5 V) up to 36 V. Exceeding 37 V risks permanent damage. The device regulates by sinking current from the cathode to anode, making VKA the key voltage stress parameter in shunt configurations.

Can TL432BQDBVRG4 be used in place of a Zener diode?

Yes, TL432BQDBVRG4 is explicitly designed as a high-performance Zener diode replacement. With 0.5% initial tolerance, ≤34 mV total temperature drift, and 0.2 Ω dynamic impedance, it outperforms most discrete Zeners in accuracy, stability, and noise-especially in automotive or industrial environments where thermal variation is significant.

What is the reference input current (Iref) specification for TL432BQDBVRG4?

The reference input current (Iref) for TL432BQDBVRG4 is 2–4 µA at 25°C, with a maximum deviation of 2.5 µA over the full –40°C to 125°C range. This ultra-low bias current enables high-value resistor dividers without introducing significant error or self-heating effects, supporting precision feedback networks in space-constrained layouts.