Nexperia USA Inc. TLVH431NMQDBZRVL

Overview

TLVH431NMQDBZR from Nexperia is a three-terminal adjustable precision shunt regulator with mirrored pinning (K-REF-A) in SOT23 package, 1.24 V reference voltage (±1.5 %), -40 °C to +125 °C operating range, and 0.1 Ω typical dynamic 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 pin configuration, thermal derating curves, cathode current limits (0.08–70 mA), reference voltage drift over temperature (-5 to +10 mV), and mirrored vs. normal pinning compatibility considerations.

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 pinout (Pin 1 = K, Pin 2 = REF, Pin 3 = A) distinguishes it from standard TLVH431N variants and requires PCB layout revision when substituting.

It operates as a two-quadrant active shunt: sinking up to 70 mA while maintaining <0.15 Ω dynamic impedance below 1 kHz, with off-state leakage <0.05 μA at 14 V and reference current <0.30 μA-enabling stable operation in low-power feedback paths and high-accuracy current sinks.

Key Specifications

Pinout & Package

SOT23-3 plastic surface-mounted package (3.0 × 1.4 × 1.1 mm), lead-free, RoHS-compliant, with mirrored pinning 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, TLVH431NQDBZR avoids pinout mismatch but mandates layout change, while TLVH431NAQDBZR improves reference accuracy at the expense of cost and no pinout advantage-making MQDBZR optimal for drop-in replacement in mirrored-footprint designs demanding 1.5 % precision.

Availability

TLVH431NMQDBZR is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current sinking, on-board voltage regulation, and programmable threshold detection requiring stable component supply across automotive under-hood, industrial power, and battery-powered embedded applications.

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 delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency, miniaturization, and robustness for power management and signal integrity.

TLVH431NMQDBZR belongs to the TLVH431N family of adjustable shunt regulators designed specifically for precision voltage and current control in space-constrained, thermally demanding power systems-including SMPS feedback, current limiting, and analog monitoring.

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 normal pinning: Pin 1 = REF, Pin 2 = K, Pin 3 = A. This physical inversion prevents direct PCB substitution without trace rerouting or adapter design.

Can TLVH431NMQDBZR replace a standard Zener diode in a shunt regulator circuit?

Yes-TLVH431NMQDBZR replaces Zener diodes with superior performance: adjustable output (1.24–14 V), ±1.5 % reference accuracy vs. ±5 % for typical Zeners, 0.1 Ω dynamic impedance vs. >10 Ω for Zeners, and microampere-level reference current enabling high-value resistor dividers.

What is the maximum power dissipation for TLVH431NMQDBZR at 85 °C ambient?

At 85 °C ambient on a standard FR4 PCB (single-sided copper, tin-plated), the maximum power dissipation is derated to approximately 450 mW, calculated from the 360 K/W junction-to-ambient thermal resistance and 150 °C max junction temperature: P_max = (150 − 85) / 360 ≈ 0.18 W. Full 580 mW rating applies only at ≤25 °C ambient.

Does TLVH431NMQDBZR require an external capacitor for stability in SMPS feedback applications?

Yes-stability depends on load capacitance and ESR. Figure 20 shows stable operation with ≥10 nF ceramic capacitor at 25 °C and 10 mA cathode current. For worst-case conditions (high temperature, low current), verify phase margin using the test circuits in Figures 21–22; insufficient capacitance causes oscillation in isolated feedback loops.