Nexperia USA Inc. TLVH431NAIDBZRR

Overview

TLVH431NAIDBZR from Nexperia is an A-grade (1.0 % reference voltage tolerance), adjustable precision shunt regulator in SOT23 package, with 1.24 V reference voltage, 0.1 Ω typical dynamic cathode-anode impedance, and -40 °C to +85 °C operating temperature range. It functions as a programmable voltage reference or current sink in feedback paths of isolated DC-DC converters and precision current-limiting circuits.

For engineers reviewing the TLVH431NAIDBZR datasheet, TLVH431NAIDBZR pinout, TLVH431NAIDBZR application, or TLVH431NAIDBZR equivalent, key selection criteria include reference accuracy at extended temperature, low output impedance for stable regulation, cathode current capability up to 70 mA, and SOT23 footprint compatibility with space-constrained power management designs.

Technical Context

The TLVH431NAIDBZR implements a three-terminal shunt topology where the REF pin senses voltage across external resistive dividers, triggering cathode current conduction when the sensed voltage exceeds 1.24 V. Its internal amplifier drives a bipolar output stage with sharp turn-on characteristics, replacing Zener diodes in high-stability applications.

It operates over -40 °C to +85 °C with 1.0 % initial Vref tolerance (1228–1252 mV at 10 mA, 25 °C), exhibits ≤0.15 Ω dynamic impedance below 1 kHz, and maintains <0.30 μA reference current across its full temperature range - enabling low-power biasing and minimal divider loading.

Key Specifications

Pinout & Package

SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.1 mm × 1.0 mm body, standard pinning configuration (REF–K–A).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431NAIDBZR, TLVH431NIDBZR trades 0.5 % reference accuracy for lower unit cost in commercial-temperature applications, while TLVH431NAQDBZR extends thermal capability to +125 °C at identical accuracy - demanding higher thermal resistance management in PCB layout.

Availability

TLVH431NAIDBZR is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current limiting, and on-board voltage reference applications requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for TLVH431NAIDBZR 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 leading semiconductor manufacturer specializing in high-performance, reliable discrete and analog components for industrial, consumer, and communications markets.

TLVH431NAIDBZR belongs to the TLVH431N family of adjustable precision shunt regulators, designed specifically for stable, low-noise voltage reference and current-sink functions in space-constrained power management systems.

FAQ

What is the minimum cathode current required for regulation?

The TLVH431NAIDBZR requires a minimum cathode current (I_K(min)) of 55 μA to maintain regulation, verified at V_KA = V_ref. Below this, the device exits active regulation and behaves as an open circuit between cathode and anode. This value is stable across -40 °C to +85 °C and enables use in ultra-low-power bias networks.

Can TLVH431NAIDBZR replace a Zener diode directly?

Yes - TLVH431NAIDBZR replaces Zener diodes in shunt regulation roles with superior performance: it offers programmable output (1.24–14 V), ±1.0 % reference accuracy vs. typical ±5 % Zener tolerance, and 0.1 Ω dynamic impedance vs. >10 Ω for most Zeners. No additional components are needed beyond the two external resistors.

How does the mirrored pinning variant differ?

TLVH431NAIDBZR uses standard SOT23 pinning (Pin 1 = REF, Pin 2 = K, Pin 3 = A). Mirrored variants (e.g., TLVH431NAMQDBZR) swap REF and K pins (Pin 1 = K, Pin 2 = REF). Using a mirrored part in a standard-layout PCB causes functional failure - pinout must match the schematic and footprint exactly.

Is TLVH431NAIDBZR automotive-qualified?

No - TLVH431NAIDBZR is not automotive-qualified. Per Nexperia's revision history (Rev. 3, Oct 2024), the TLVH431N family is explicitly designated non-automotive. For automotive applications, Nexperia offers separate -Q qualified variants (e.g., TLVH431NQDBZR) with AEC-Q101 testing and extended temperature validation.