Nexperia USA Inc. TLVH431NCDBZR-QVL

Overview

TLVH431NCDBZR-Q from Nexperia is a three-terminal adjustable precision shunt regulator with 1.24 V reference voltage, ±1.5 % initial tolerance at 25 °C, and 0.1 Ω typical dynamic cathode-anode impedance. It operates over 0 °C to 70 °C ambient temperature, supports sink currents from 80 µA to 70 mA, and is qualified per AEC-Q100 Grade 1 for automotive feedback loops.

For engineers reviewing the TLVH431NCDBZR-Q datasheet, TLVH431NCDBZR-Q pinout, TLVH431NCDBZR-Q application, or TLVH431NCDBZR-Q equivalent, this device serves as a Zener diode replacement in isolated SMPS feedback, precision current sinking, and on-board voltage regulation where tight reference stability and low output impedance are required.

Technical Context

The TLVH431NCDBZR-Q implements an internal bandgap reference and high-gain error amplifier driving a NPN pass transistor, enabling sharp turn-on and stable regulation across its 1.24 V–14 V programmable output range via two external resistors. Its functional diagram confirms REF, K (cathode), and A (anode) terminals define a shunt-controlled current path.

It delivers 0.19–0.30 µA reference input current, exhibits <2 mV reference voltage drift over 0 °C–70 °C, and maintains <0.8 mV/V cathode-anode voltage sensitivity-critical for maintaining accuracy under varying load and line conditions in closed-loop systems.

Key Specifications

Pinout & Package

SOT23 (TO-236AB) surface-mount package with 3 leads, 1.9 mm × 1.1 mm footprint, and standard pinning configuration (REF–K–A).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431ACDBZR-Q, this part trades 0.5 % initial accuracy for lower cost and broader commercial acceptance; compared with TL431ACDBZR, it provides guaranteed automotive reliability but narrower ambient operating range (0–70 °C vs. -40–125 °C).

Availability

TLVH431NCDBZR-Q is available at Aetrix Electronics and suitable for automotive infotainment power supplies, ADAS camera module biasing, and industrial PLC analog I/O conditioning requiring stable component supply and AEC-Q100 compliance.

Supply support for TLVH431NCDBZR-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 logic, discrete, and MOSFET solutions with emphasis on automotive-grade reliability and energy efficiency.

This device belongs to the TLVH431N-Q family of AEC-Q100-qualified shunt regulators designed specifically for precision voltage and current control in automotive power management and feedback systems.

FAQ

What is the minimum cathode current required for regulation?

The TLVH431NCDBZR-Q requires a minimum cathode current of 55 µA to maintain regulation, as specified in the datasheet under IK(min). This value ensures the internal error amplifier remains active and the reference remains stable. Operation below this threshold may result in unregulated output or increased output impedance.

Can this device replace a standard Zener diode directly?

Yes-it functions as a 3-terminal Zener replacement with superior accuracy, lower dynamic impedance (0.1 Ω vs. >1 Ω for typical Zeners), and programmable voltage. Unlike 2-terminal Zeners, it requires a reference resistor network but eliminates voltage tolerance stacking and temperature drift issues inherent in discrete Zener + series resistor solutions.

How does the mirrored pinning variant differ?

The TLVH431NCDBZR-Q uses normal pinning (REF–K–A), whereas variants ending in MQDBZR use mirrored pinning (K–REF–A). Pin 1 and Pin 2 are swapped; using the wrong variant causes immediate functional failure. Always verify marking code (8M% for this part) and match PCB footprint to the correct pinout table in Section 5 of the datasheet.

What is the maximum power dissipation at 70 °C ambient?

At 70 °C ambient, the maximum allowable power dissipation is approximately 220 mW, derived from the FR4 PCB derating curve (Figure 2, curve 1). This assumes standard footprint mounting; exceeding this limit risks junction temperature exceeding 150 °C, triggering thermal shutdown or long-term reliability degradation.