Nexperia USA Inc. TLVH431NMQDBZR-QR

Overview

TLVH431NMQDBZR-Q from Nexperia is a three-terminal adjustable precision shunt regulator with mirrored pinning (K-REF-A), 1.24 V reference voltage, ±1.5 % initial tolerance, and -40 °C to +125 °C operating range. It delivers 0.1 Ω typical dynamic impedance, supports 0.08 mA to 70 mA sink current, and is AEC-Q100 Grade 1 qualified for automotive feedback loops.

For engineers reviewing the TLVH431NMQDBZR-Q datasheet, TLVH431NMQDBZR-Q pinout, TLVH431NMQDBZR-Q application, or TLVH431NMQDBZR-Q equivalent, key selection factors include its mirrored SOT23 pinout, 125 °C max ambient rating, low output noise, and compatibility with isolated SMPS feedback networks requiring stable shunt regulation under thermal stress.

Technical Context

This device operates as a programmable shunt reference where output voltage is set by two external resistors between cathode and reference terminals, enabling precise regulation from 1.24 V to 14 V. Its internal bandgap reference and active output stage deliver sharp turn-on characteristics and low temperature drift.

The TLVH431NMQDBZR-Q uses mirrored pinning (Pin 1 = K, Pin 2 = REF, Pin 3 = A), distinguishing it from normal-pinned variants. It maintains 0.15 Ω max dynamic cathode-anode impedance below 1 kHz and exhibits ≤10 mV reference voltage variation over its full -40 °C to +125 °C operating range.

Key Specifications

Pinout & Package

SOT23 plastic surface-mounted package (TO-236AB), 3-lead, 1.3 mm × 2.9 mm × 1.0 mm body, with mirrored pin configuration specific to MQDBZR suffix variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431NMQDBZR-Q, TLVH431NQDBZR-Q offers identical performance but requires layout adaptation for normal pinning, while TLVH431NAQDBZR-Q trades higher accuracy for increased cost-making the MQ variant optimal for cost-sensitive, thermally demanding automotive shunt regulation where mirrored pinout eases routing.

Availability

TLVH431NMQDBZR-Q is available at Aetrix Electronics and suitable for automotive power supplies, industrial sensor interfaces, and precision current-sink circuits requiring stable component supply across extended temperature ranges.

Supply support for TLVH431NMQDBZR-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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, miniaturization, and automotive-grade robustness.

The TLVH431N-Q family targets automotive and industrial shunt regulation, designed specifically to replace Zener diodes with superior thermal stability, tighter tolerance, and AEC-Q100 compliance.

FAQ

What does the 'MQ' in TLVH431NMQDBZR-Q indicate?

The 'MQ' suffix denotes mirrored pinning (K-REF-A) in the SOT23 package, differentiating it from normal-pinned variants like TLVH431NQDBZR-Q (REF-K-A). This configuration places the cathode at Pin 1 to simplify PCB routing in compact automotive modules where anode grounding dominates layout topology.

Can TLVH431NMQDBZR-Q be used in place of a Zener diode?

Yes-it functions as a precision, programmable replacement for Zener diodes with advantages including adjustable output (1.24 V–14 V), ±1.5 % reference tolerance, 0.1 Ω dynamic impedance, and AEC-Q100 Grade 1 qualification. Unlike Zeners, it requires only two external resistors and delivers stable regulation across −40 °C to +125 °C without significant voltage drift.

What is the minimum cathode current needed for regulation?

The device requires ≥55 μA cathode current (IK(min)) to maintain regulation at Vref. This value is confirmed in Table 10 under "IK(min) minimum cathode current" and ensures reliable turn-on even with high-value feedback resistors-critical for low-power sensor interface designs.

How does the mirrored pinout affect PCB layout compared to standard TLVH431N variants?

Mirrored pinout swaps REF and K positions (Pin 1 = K, Pin 2 = REF), allowing direct cathode connection to high-current nodes without crossing traces. This reduces parasitic inductance in SMPS feedback paths and avoids vias near the reference node-improving noise immunity and stability in automotive-grade power supplies.