Nexperia USA Inc. TLVH431NMQDBZRR

Overview

TLVH431NMQDBZR from Nexperia is a three-terminal adjustable precision shunt regulator with mirrored pinning in SOT23 package, 1.24 V reference voltage (±1.5 % tolerance), -40 °C to +125 °C operating range, and 0.1 Ω typical dynamic cathode-anode impedance - used for isolated feedback loops in SMPS and precision current sinking.

For engineers reviewing the TLVH431NMQDBZR datasheet, TLVH431NMQDBZR pinout, TLVH431NMQDBZR application, or TLVH431NMQDBZR equivalent, this page delivers verified electrical parameters, mirrored SOT23 terminal mapping, thermal derating curves, stability boundary data for load capacitance, and real-world use cases in regulated power supplies and current-limiting circuits.

Technical Context

The TLVH431NMQDBZR implements a bandgap-based reference amplifier driving an NPN output stage, enabling sharp turn-on and low-output-impedance regulation across 1.24 V to 14 V via external resistor dividers. Its mirrored pinning (Pin 1 = K, Pin 2 = REF, Pin 3 = A) distinguishes it from standard-pin variants and ensures correct PCB layout in space-constrained feedback paths.

It operates with sink current from 80 µA to 70 mA, maintains <0.3 µA reference current at 25 °C, and exhibits <2.7 mV/V cathode-anode voltage sensitivity - critical for stable operation under varying input conditions in isolated DC-DC converters.

Key Specifications

Pinout & Package

SOT23 plastic surface-mounted package (3 leads), 1.9 mm × 1.1 mm × 1.0 mm body, 0.95 mm pitch; mirrored pinning configuration specific to MQDBZR suffix.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431NMQDBZR, TLVH431NQDBZR requires layout adaptation but offers identical regulation behavior, while TLVH431NAQDBZR trades tighter initial tolerance for higher cost - making MQDBZR optimal for cost-sensitive, space-constrained isolated feedback designs where mirrored pinning saves routing layers.

Availability

TLVH431NMQDBZR is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current sinking, on-board voltage regulation, and overcurrent limiting requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.

Supply support for TLVH431NMQDBZR 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 logic, discrete, and power MOSFET solutions - delivering robust, scalable components for industrial, automotive, and consumer applications.

TLVH431NMQDBZR belongs to Nexperia's precision shunt regulator product line, designed specifically for cost-effective, thermally stable voltage and current regulation in space-constrained power management circuits.

FAQ

What is the pin configuration difference between TLVH431NMQDBZR and TLVH431NQDBZR?

TLVH431NMQDBZR uses mirrored pinning: Pin 1 = Cathode (K), Pin 2 = Reference (REF), Pin 3 = Anode (A). TLVH431NQDBZR uses standard pinning: Pin 1 = REF, Pin 2 = K, Pin 3 = A. This distinction is critical for PCB layout - incorrect placement causes open-loop failure in feedback circuits.

Can TLVH431NMQDBZR replace a Zener diode in a 5 V shunt regulator?

Yes - with two external resistors (e.g., R1 = 3.01 kΩ, R2 = 1 kΩ), it sets 5.00 V output with ±1.5 % accuracy and superior thermal stability versus standard Zeners. Its 0.1 Ω dynamic impedance also provides better load regulation and lower noise than typical 5.1 V Zeners.

What is the minimum cathode current required for regulation?

The TLVH431NMQDBZR requires ≥55 µA cathode current (IK(min)) to maintain regulation at V_KA = V_ref. Below this, the device exits active regulation - so feedback divider networks must deliver sufficient current, especially at low temperatures where I_ref rises slightly.

How does load capacitance affect stability in TLVH431NMQDBZR circuits?

Stability depends on load capacitance (C_L) and ESR: Figure 20 shows stable operation above ~10 nF at 25 °C, but minimum C_L increases at higher temperatures or lower currents. Always verify phase margin with actual PCB layout and worst-case ESR, particularly in isolated feedback paths with optocouplers.