Nexperia USA Inc. TLVH431NAQDBZRR

Overview

TLVH431NAQDBZR from Nexperia is an A-grade adjustable precision shunt regulator in SOT23 package, featuring 1.0 % reference voltage tolerance (1228–1252 mV at 10 mA), 0.1 Ω typical dynamic cathode-anode impedance, and operation across –40 °C to 125 °C. It sets output voltage from 1.24 V to 14 V via two external resistors and serves as a stable voltage reference or current sink in isolated SMPS feedback paths.

For engineers reviewing the TLVH431NAQDBZR datasheet, TLVH431NAQDBZR pinout, TLVH431NAQDBZR application, or TLVH431NAQDBZR equivalent, key selection criteria include reference accuracy over temperature, low output impedance for loop stability, cathode current range (0.08–70 mA), and SOT23 thermal performance on FR4 PCBs.

Technical Context

The TLVH431NAQDBZR implements a bandgap-based reference core with active error amplifier and output stage, enabling sharp turn-on and precise regulation without external compensation in most configurations. Its functional diagram shows REF, K (cathode), and A (anode) terminals forming a 3-terminal shunt topology that replaces Zener diodes in precision applications.

It operates as a two-node controlled current sink: reference voltage at REF sets cathode current IK via external resistor divider, while dynamic impedance remains ≤0.15 Ω below 1 kHz. Thermal stability is specified across –40 °C to +125 °C with ΔVref ≤ ±2.2 mV over full range for A-grade devices.

Key Specifications

Pinout & Package

SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.1 mm footprint, 0.95 mm height, with standard pinning (REF–K–A).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431NAQDBZR, TLVH431ACDBZR trades thermal range for lower cost in benign environments, while TLVH431NIDBZR offers broader availability and lower unit price at the expense of reference accuracy-making the NAQDBZR optimal for high-precision, high-temp industrial feedback loops.

Availability

TLVH431NAQDBZR is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current sinking, and adjustable linear regulation requiring stable component supply across extended temperature ranges.

Supply support for TLVH431NAQDBZR 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

Nexperia is a global semiconductor expert delivering high-performance logic, discrete, and MOSFET solutions with focus on efficiency, reliability, and miniaturization.

TLVH431NAQDBZR belongs to the TLVH431N family of adjustable shunt regulators designed specifically for precision voltage referencing and current regulation in space-constrained industrial and communications power systems.

FAQ

What is the maximum cathode-anode voltage for TLVH431NAQDBZR?

The absolute maximum cathode-anode voltage (VKA) is 14 V per IEC 60134 limiting values. Operation above this risks permanent damage. The recommended operating range is Vref to 14 V, with typical applications setting VKA between 2.5 V and 12 V to maintain regulation stability and thermal safety.

How does the 1.0 % reference tolerance impact output voltage accuracy in a feedback divider?

With a two-resistor divider, total output error includes Vref tolerance, resistor ratio error, and temperature drift. At 25 °C, ±1.0 % Vref contributes directly to output error; for a 5 V output, this yields ±50 mV baseline uncertainty before resistor tolerances. Using 0.1 % resistors and low-TCR materials keeps total error under ±0.5 % over temperature.

Can TLVH431NAQDBZR drive an optocoupler LED directly in an isolated SMPS?

Yes. With IK ranging from 0.08 mA to 70 mA and typical CTR-compatible current levels (2–10 mA), it directly biases common optocouplers like PC817 or SFH615A. Layout best practices-short traces, local 100 nF bypass, and thermal anchoring of the anode pad-ensure stability and longevity.

What thermal derating applies when mounting TLVH431NAQDBZR on a standard FR4 PCB?

On standard FR4 (single-sided copper, tin-plated), Rth(j-a) is 360 K/W. At 25 °C ambient, max power dissipation is 350 mW. Above 25 °C, power must be linearly derated: e.g., at 75 °C ambient, max dissipation drops to ~200 mW. Use larger copper pours or ceramic substrates for higher power.