Nexperia USA Inc. TLVH431NACDBZRR

Overview

TLVH431NACDBZRR from Nexperia is an A-grade adjustable precision shunt regulator in SOT23 package, featuring 1.0% reference voltage tolerance (1228–1252 mV at 10 mA), 0.1 Ω typical dynamic cathode-anode impedance, and sink current capability from 0.08 mA to 70 mA. It operates across –40 °C to +85 °C and serves as a programmable voltage reference or precision current sink in isolated SMPS feedback paths.

For engineers reviewing the TLVH431NACDBZRR datasheet, TLVH431NACDBZRR pinout, TLVH431NACDBZRR application, or TLVH431NACDBZRR equivalent, key selection criteria include reference accuracy over temperature, low output impedance for stable regulation, cathode current range compatibility with external resistor networks, and SOT23 footprint suitability for space-constrained power management designs.

Technical Context

The TLVH431NACDBZRR implements a three-terminal shunt topology with internal bandgap reference and error amplifier driving an NPN output stage. Its reference voltage is set externally via two resistors between cathode, anode, and REF pins, enabling output programming from 1.24 V to 14 V.

It delivers sharp turn-on characteristics and low thermal drift (±0.3 mV over 0–70 °C), with dynamic impedance under 0.15 Ω up to 1 kHz. The device supports stable operation with load capacitance ≥10 nF and exhibits off-state current <0.05 μA at 14 V cathode-anode voltage.

Key Specifications

Pinout & Package

SOT23-3 plastic surface-mounted package (3.0 × 1.4 × 1.1 mm), normal pinning configuration per Table 3: Pin 1 = REF, Pin 2 = K (cathode), Pin 3 = A (anode).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLVH431NCDBZR and TL431CDBZR, TLVH431NACDBZRR offers superior reference accuracy (±1.0%) and lower reference current (0.19–0.30 μA), making it optimal for high-precision, low-power feedback and reference applications where stability and efficiency are prioritized over extended temperature coverage or lowest unit cost.

Availability

TLVH431NACDBZRR is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision current sinking, and on-board voltage reference applications requiring stable component supply, consistent parametric performance, and SOT23 footprint compatibility.

Supply support for TLVH431NACDBZRR 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 manufacturer headquartered in Nijmegen, Netherlands, specializing in high-performance logic, discrete, and power MOSFET solutions for automotive, industrial, and consumer markets.

TLVH431NACDBZRR belongs to the TLVH431N family of adjustable precision shunt regulators designed for industrial-grade power management, offering improved accuracy and thermal stability over legacy TL431 derivatives in compact SOT23 packaging.

FAQ

What is the minimum cathode current required for regulation?

The TLVH431NACDBZRR requires a minimum cathode current (I_K(min)) of 55 μA to maintain regulation, verified across its operating temperature range. This value ensures reliable turn-on and stable reference voltage establishment even under light-load conditions, such as in high-impedance feedback networks where cathode current may fall near the threshold.

Can TLVH431NACDBZRR replace a Zener diode directly?

Yes - TLVH431NACDBZRR can directly replace Zener diodes in shunt regulation applications due to its sharp turn-on characteristic, programmable output (1.24–14 V), and lower dynamic impedance (0.1 Ω vs. typical Zener's 5–50 Ω). Unlike Zeners, it requires no minimum current to stabilize and provides significantly better temperature stability and voltage accuracy.

What is the maximum cathode-anode voltage rating?

The absolute maximum cathode-anode voltage (V_KA) for TLVH431NACDBZRR is 14 V, per IEC 60134 limiting values. Operation above this voltage risks permanent damage. For reliable long-term use, the recommended operating condition limits V_KA to 14 V, aligning with its specified output voltage ceiling and internal junction protection design.

How does mirrored pinning differ from normal pinning in this family?

TLVH431NACDBZRR uses normal pinning (REF–K–A), whereas mirrored-pinning variants (e.g., TLVH431NAMQDBZR) swap REF and K positions (K–REF–A). This affects PCB layout and external circuit connection: incorrect pin mapping causes functional failure. Mirrored versions exist for specific board routing constraints but are not interchangeable without layout revision.