Nexperia USA Inc. TLVH431NCDBZRR

Overview

TLVH431NCDBZRR from Nexperia is a three-terminal adjustable precision shunt regulator with 1.5 % reference voltage tolerance, 1.24 V to 14 V programmable output range set by two external resistors, and 0.1 Ω typical dynamic cathode-anode impedance - used in isolated feedback loops of switch-mode power supplies operating from 0 °C to 70 °C ambient.

For engineers reviewing the TLVH431NCDBZRR datasheet, TLVH431NCDBZRR pinout, TLVH431NCDBZRR application, or TLVH431NCDBZRR equivalent, key selection criteria include reference voltage accuracy over temperature, minimum cathode current (55 μA), sink current capability (70 mA), and SOT23 package thermal derating on FR4 PCBs.

Technical Context

The TLVH431NCDBZRR implements a bandgap-based reference core with active output circuitry delivering sharp turn-on characteristics and low output noise. Its functional diagram shows REF, K (cathode), and A (anode) terminals forming a 3-terminal shunt topology where regulation occurs via current sinking through the cathode when the REF node exceeds 1.24 V.

It operates as a voltage-controlled current sink: when VKA ≥ Vref, the device draws IK from cathode to anode to maintain VREF at 1.24 V ±15 mV across 0 °C to 70 °C. Dynamic impedance remains ≤0.15 Ω below 1 kHz, enabling stable operation with load capacitances down to 10 nF under specified conditions.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431ACDBZR, TLVH431NCDBZRR trades 0.5 % reference accuracy for lower unit cost while retaining identical thermal performance and layout compatibility; versus TL431CDBZR, it delivers superior accuracy and lower impedance at the expense of temperature range and maximum current rating.

Availability

TLVH431NCDBZRR is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current sinking, and adjustable linear regulation requiring stable component supply across commercial temperature ranges.

Supply support for TLVH431NCDBZRR 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 specializing in high-performance logic, analog, and discrete components, with manufacturing rooted in process technology and reliability engineering.

The TLVH431N family targets precision voltage regulation in space-constrained power management systems, emphasizing low impedance, tight tolerance, and robust thermal behavior in SOT23 packaging.

FAQ

What is the minimum cathode current required for regulation?

The TLVH431NCDBZRR requires a minimum cathode current (IK(min)) of 55 μA to maintain regulation at Vref. This value is guaranteed across 0 °C to 70 °C ambient and defines the lowest usable current in ultra-low-power feedback circuits - for example, in battery-backed SMPS standby modes where divider resistor values must be selected to ensure this threshold is met.

Can TLVH431NCDBZRR replace a Zener diode in existing designs?

Yes - the TLVH431NCDBZRR replaces Zener diodes in shunt regulation applications with superior performance: its 1.24 V reference is more precise than typical Zeners, its 0.1 Ω dynamic impedance yields lower output variation under load, and its sharp turn-on eliminates soft knee behavior. Layout changes are minimal since both use SOT23 packages and three-terminal topologies, but resistor divider values must be recalculated for 1.24 V reference.

How does thermal derating affect maximum power dissipation?

On a standard FR4 PCB, TLVH431NCDBZRR's maximum power dissipation drops from 350 mW at 25 °C to zero at 125 °C due to its 360 K/W junction-to-ambient thermal resistance. For continuous 70 mA sink operation at 12 V differential, power dissipation reaches 840 mW - exceeding rated limits; thus, either reduce voltage drop, add copper pour, or limit duty cycle to stay within safe junction temperature (≤150 °C).

What is the impact of reference current (Iref) on output accuracy?

The TLVH431NCDBZRR draws up to 0.30 μA into the REF pin, which flows through the upper divider resistor (R1) and introduces a voltage error equal to Iref × R1. For a 10 kΩ R1, this adds up to 3 mV offset - 0.24 % of 1.24 V. To minimize error, use lower R1 values or compensate in the divider ratio; Iref variation over temperature (±1.0 μA) further contributes to drift in high-accuracy applications.