Texas Instruments TLVH432ACPKG3

Overview

TLVH432ACPKG3 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-89-3 package, providing 1.24 V reference voltage with ±1% initial tolerance 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.

For engineers reviewing the TLVH432ACPKG3 datasheet, TLVH432ACPKG3 pinout, TLVH432ACPKG3 application, or TLVH432ACPKG3 equivalent, key selection considerations include its 1.24 V reference accuracy, ultra-low 0.25 Ω dynamic impedance, SOT-89 pinout compatibility with secondary-side regulation circuits, and thermal stability across automotive-grade temperature ranges.

Technical Context

The TLVH432ACPKG3 implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal architecture enables closed-loop regulation via resistive divider feedback from cathode to reference pin, or open-loop comparator operation with direct input on the reference terminal.

Unlike the TLVH431, the TLVH432ACPKG3 uses reversed pinout (CATHODE–REF–ANODE) in SOT-89, enabling direct drop-in replacement in designs requiring inverted terminal sequence for PCB layout optimization or optocoupler interface routing. It maintains identical electrical specs-including 1.24 V VREF, 0.25 Ω typical zKA, and 100 μA IK(min)-across all grades and packages.

Key Specifications

Pinout & Package

SOT-89-3 package: 4.50 mm × 2.50 mm body, 1.0 mm nominal height, gull-wing leads, tape-and-reel packaging.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH432ACPKG3, TLVH432ACPW offers 40% smaller footprint but demands new layout, while TLVH431ACPK shares the same package yet requires pin-swapped routing - making TLVH432ACPKG3 optimal for new designs needing SOT-89 with cathode-first terminal order.

Availability

TLVH432ACPKG3 is available at Aetrix Electronics and suitable for isolated SMPS feedback, voltage monitoring, precision ADC references, and low-leakage clamping applications requiring stable component supply across automotive, industrial, and telecom end equipment.

Supply support for TLVH432ACPKG3 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 delivering analog and embedded processing solutions, with leadership in precision analog, power management, and signal chain technologies.

The TLVH432ACPKG3 belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy feedback and monitoring in isolated power supplies, battery management, and industrial sensing systems.

FAQ

What is the reference voltage tolerance of TLVH432ACPKG3 at 25°C?

The TLVH432ACPKG3 has a reference voltage tolerance of ±1% at 25°C, corresponding to the 'A' grade designation. This means V_REF is guaranteed between 1.228 V and 1.252 V under nominal conditions, enabling predictable voltage setting in feedback networks without calibration.

Does TLVH432ACPKG3 require an output capacitor for stability?

No, TLVH432ACPKG3 is internally compensated and remains stable without an output capacitor between cathode and anode. However, if a capacitor is added for noise filtering, Figures 5-15 through 5-17 in the datasheet provide phase-margin guidance for selecting values up to 10 nF depending on cathode voltage and load conditions.

How does the pinout of TLVH432ACPKG3 differ from TLVH431ACPK?

TLVH432ACPKG3 uses CATHODE–REF–ANODE pinout (Pin 1–2–3) in SOT-89, whereas TLVH431ACPK uses REF–ANODE–CATHODE. This reversal allows direct cathode connection to high-side rails in flyback designs, but prevents drop-in replacement without PCB trace changes.

What is the minimum cathode current required for regulation in TLVH432ACPKG3?

The TLVH432ACPKG3 requires a minimum cathode current of 100 μA to maintain regulation, as specified in the recommended operating conditions. Below this level, gain drops significantly and reference accuracy degrades - critical for low-power monitoring circuits where IK may approach this limit.

Can TLVH432ACPKG3 be used as a comparator?

Yes, TLVH432ACPKG3 operates as a high-gain comparator in open-loop configuration. With proper cathode current (>100 μA), it compares voltage at the REF pin to its internal 1.24 V reference and drives the CATHODE pin low when REF exceeds V_REF, eliminating need for external reference in level-detection circuits.