Texas Instruments TLVH432BIDBZTG4

Overview

TLVH432BIDBZTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, featuring 1.24 V reference voltage (±0.5% at 25°C), 100 μA to 70 mA cathode current range, and operation from –40°C to +125°C. It functions as an error amplifier or comparator with integrated reference in isolated flyback SMPS feedback loops and voltage monitoring circuits.

For engineers reviewing the TLVH432BIDBZTG4 datasheet, TLVH432BIDBZTG4 pinout, TLVH432BIDBZTG4 application, or TLVH432BIDBZTG4 equivalent, key selection criteria include reference accuracy grade (B), SOT-23-3 pin configuration (REF–CATHODE–ANODE), thermal stability over industrial/automotive temperature ranges, and compatibility with optocoupler-based secondary-side regulation.

Technical Context

The TLVH432BIDBZTG4 implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal architecture delivers sharp turn-on characteristics and 0.25 Ω typical dynamic impedance, enabling stable regulation without external compensation capacitors across its 1.24 V to 18 V output voltage range set by two external resistors.

Unlike the TLVH431, the TLVH432BIDBZTG4 uses a distinct SOT-23-3 pinout (Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE) optimized for compact PCB layouts in space-constrained power management systems. It maintains identical electrical specifications-including 0.5% initial VREF tolerance, 100 μA minimum cathode current, and ±20 mV VREF deviation over –40°C to +125°C-as its B-grade counterpart in other packages.

Key Specifications

Pinout & Package

SOT-23-3 package (2.92 mm × 1.30 mm body size) with gull-wing leads; RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH432BIDBVTG4 and TLVH431BIDBZTG4, the TLVH432BIDBZTG4 offers optimal space efficiency in SOT-23-3 while maintaining B-grade accuracy and full automotive temperature range-making it preferred for new designs prioritizing miniaturization and thermal robustness without pinout complexity.

Availability

TLVH432BIDBZTG4 is available at Aetrix Electronics and suitable for isolated power supplies, precision data acquisition systems, and automotive voltage monitoring requiring stable component supply across extended temperature ranges.

Supply support for TLVH432BIDBZTG4 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 power management solutions.

The TLVH432BIDBZTG4 belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy feedback and reference applications in isolated power supplies, data converters, and system supervision circuits.

FAQ

What is the pin configuration of TLVH432BIDBZTG4?

The TLVH432BIDBZTG4 uses a 3-pin SOT-23 package with Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. This differs from the TLVH431 family's REF–ANODE–CATHODE order and is optimized for compact feedback loop routing in flyback converters. Always verify pinout against TI's SLVS555N datasheet Figure 4-5 before PCB layout.

What does the 'B' grade signify in TLVH432BIDBZTG4?

The 'B' grade in TLVH432BIDBZTG4 indicates ±0.5% reference voltage tolerance at 25°C, tighter than A-grade (±1%) or standard grade (±1.5%). This grade is specified across the full –40°C to +125°C operating range with ≤±20 mV total VREF deviation, making TLVH432BIDBZTG4 suitable for high-accuracy applications like precision ADC references and automotive power rail monitors.

Can TLVH432BIDBZTG4 replace a Zener diode directly?

Yes, TLVH432BIDBZTG4 can directly replace Zener diodes in most shunt regulation roles, offering superior performance: 0.5% initial tolerance versus typical Zener ±5%, 0.02–0.1 μA off-state current versus Zener leakage in μA–mA range, and 0.25 Ω dynamic impedance versus Zener's 10–100 Ω. However, it requires minimum 100 μA cathode current to regulate and cannot operate below 1.24 V cathode-to-anode voltage.

How does TLVH432BIDBZTG4 achieve stability without an output capacitor?

TLVH432BIDBZTG4 integrates internal frequency compensation that ensures phase margin >45° across its operating range, eliminating the need for external cathode-to-anode capacitors in most applications. Stability is maintained up to 10 nF capacitive load per TI's Figure 5-15–5-17; larger loads may require series resistance or careful layout to avoid oscillation, especially in high-noise environments.

Is TLVH432BIDBZTG4 suitable for automotive applications?

Yes, TLVH432BIDBZTG4 is qualified for automotive applications with its Q-grade temperature range (–40°C to +125°C), AEC-Q100 stress testing compliance, and guaranteed performance across that full range. Its 0.5% reference accuracy, low drift, and robust ESD rating (±2000 V HBM) make TLVH432BIDBZTG4 appropriate for engine control units, ADAS power supervision, and infotainment system voltage references.