Nexperia USA Inc. TLVH431NAMQDBZR-QR

Overview

TLVH431NAMQDBZR-Q from Nexperia is an A-grade (±1.0 %) adjustable precision shunt regulator in SOT23 package with mirrored pinning (K-REF-A), operating from −40 °C to +125 °C, delivering 1.24 V reference voltage and supporting output programming up to 14 V via two external resistors; used for isolated feedback in automotive SMPS designs.

For engineers reviewing the TLVH431NAMQDBZR-Q datasheet, TLVH431NAMQDBZR-Q pinout, TLVH431NAMQDBZR-Q application, or TLVH431NAMQDBZR-Q equivalent, this page delivers verified thermal stability data, cathode-anode impedance (0.10 Ω typ), sink current range (0.08–70 mA), AEC-Q100 Grade 1 qualification, and mirrored SOT23 pin mapping.

Technical Context

The TLVH431NAMQDBZR-Q implements a three-terminal shunt regulation architecture where the REF terminal senses voltage across an external resistor divider, triggering cathode conduction when input exceeds Vref × (1 + R1/R2) + Iref × R1. Its active output stage delivers sharp turn-on and low dynamic impedance (0.10–0.15 Ω).

Designed for automotive environments, it maintains ±1.0 % reference accuracy over −40 °C to +125 °C, exhibits <0.24 μA reference current variation across temperature, and supports stable operation with load capacitance up to 80 nF-verified per Figure 20 test conditions at Tamb = 25 °C and VKA = Vref.

Key Specifications

Pinout & Package

SOT23 plastic surface-mounted package (TO-236AB), 3-lead, mirrored pinning configuration (K-REF-A) as defined in Table 3 for all part numbers ending in MQDBZR-Q.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431NAQDBZR-Q, the TLVH431NAMQDBZR-Q offers identical electrical specs but mirrored pinout for optimized cathode routing; versus TL431ACDR, it delivers 55 % lower dynamic impedance and 60 % smaller footprint-critical for compact automotive power stages.

Availability

TLVH431NAMQDBZR-Q is available at Aetrix Electronics and suitable for automotive SMPS feedback, precision current sinking, on-board voltage regulation, and programmable overvoltage clamping requiring stable component supply across extended temperature ranges.

Supply support for TLVH431NAMQDBZR-Q 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 focused on high-volume, high-reliability discrete and analog components, headquartered in Nijmegen, Netherlands, with manufacturing in Asia and Europe.

The TLVH431N-Q family targets automotive and industrial power management, delivering AEC-Q100-qualified shunt regulation with enhanced thermal stability and low-impedance performance for next-generation SMPS and safety-critical bias circuits.

FAQ

What is the pin configuration of TLVH431NAMQDBZR-Q?

This device uses mirrored SOT23 pinning: Pin 1 = K (cathode), Pin 2 = REF (reference), Pin 3 = A (anode). This differs from standard TLVH431 variants (REF-K-A) and must be accounted for in PCB layout and schematic symbol creation to avoid functional failure.

Does TLVH431NAMQDBZR-Q require an external capacitor for stability?

Yes-stability depends on load capacitance and ESR. Per Figure 20, stable operation requires ≥10 nF and ≤80 nF capacitance placed adjacent to the device, with ESR < 1 Ω. Instability manifests as oscillation in feedback loops, especially in isolated SMPS applications above 100 kHz switching frequency.

How does the A-grade tolerance affect system-level accuracy?

The ±1.0 % reference voltage tolerance directly limits total output regulation error in shunt-based feedback. When combined with 0.5 % resistor divider tolerance, worst-case error remains within ±1.5 %-sufficient for automotive 5 V or 3.3 V rails without trimming, unlike standard-grade (±1.5 %) variants which push error beyond 2 %.

Can TLVH431NAMQDBZR-Q replace a Zener diode in high-precision applications?

Yes-its active topology provides sharper knee voltage, lower dynamic impedance (0.10 Ω vs. >10 Ω for Zeners), and tighter temperature drift (±10 mV over −40 °C to +125 °C vs. ±50 mV for 5.1 V Zener). It also draws negligible reference current (sub-μA), eliminating loading errors common with Zener bias networks.