Diodes Incorporated ZR431F005TA

Overview

ZR431F005TA from Diodes Incorporated is a three-terminal adjustable precision shunt regulator in SOT23 package, with 0.5% initial reference voltage tolerance (2.50 V), 72 ppm/°C max temperature coefficient, and 50 µA to 100 mA cathode current capability-used for programmable voltage regulation in power supply feedback loops and overvoltage protection circuits.

For engineers reviewing the ZR431F005TA datasheet, ZR431F005TA pinout, ZR431F005TA application, or ZR431F005TA equivalent, key selection criteria include reference voltage accuracy, dynamic output impedance (≤0.75 Ω), thermal stability across –40°C to +125°C, and compatibility with external resistor programming for output voltages from 2.5 V to 20 V.

Technical Context

The ZR431F005TA operates as a two-input, one-output shunt reference: the reference input (VREF) senses a fraction of cathode voltage via external resistors, while the cathode (VZ) sinks current to maintain regulation. Its internal bandgap-derived reference ensures stable 2.50 V ±0.013 V at 25°C.

It features low dynamic output impedance (0.75 Ω typical), <0.1 µA off-state cathode current at 20 V, and open-loop gain >60 dB up to 10 kHz-enabling fast transient response and stable operation with capacitive loads up to 1 µF without oscillation.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount, 3-pin, lead-free, RoHS-compliant package with 0.915 mm typical body width and 2.40 mm length; moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431BIDBZR and KIA431AP, ZR431F005TA delivers tighter 0.5% VREF tolerance, lower 72 ppm/°C tempco, and guaranteed operation to +125°C-making it optimal for automotive, industrial, and high-reliability power management where thermal drift and long-term stability are critical.

Availability

ZR431F005TA is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, programmable series regulators, and temperature-compensated comparator thresholds requiring stable component supply and traceable sourcing.

Supply support for ZR431F005TA 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, automotive, and computing markets.

ZR431F005TA belongs to Diodes' precision shunt regulator product line, engineered for applications demanding low drift, high accuracy, and robust performance across extended temperature ranges-especially in power supply feedback and safety-critical voltage monitoring.

FAQ

What is the minimum cathode current required for regulation in ZR431F005TA?

The ZR431F005TA requires a minimum cathode current (IZ(MIN)) of 35 µA to maintain regulation at VREF, per Electrical Characteristics table. This low threshold enables operation in high-impedance feedback networks where current budget is constrained, such as optocoupler-based isolated supplies with large R1/R2 dividers.

Can ZR431F005TA replace a standard Zener diode directly?

Yes-ZR431F005TA can replace standard Zener diodes in shunt regulation applications, but requires two external resistors to set output voltage and proper grounding of the Anode (Pin 2). Unlike passive Zeners, it offers superior voltage accuracy, lower dynamic impedance, and guaranteed temperature stability across –40°C to +125°C.

What is the maximum capacitive load the ZR431F005TA can drive without instability?

ZR431F005TA remains stable with capacitive loads up to 1 µF when used in standard shunt configurations, as confirmed by Stability Boundary Conditions plots in the datasheet. For loads >100 nF, ensure PCB layout minimizes trace inductance and avoid placing large capacitance directly at the cathode without series resistance.

Is ZR431F005TA qualified for automotive applications?

ZR431F005TA is not AEC-Q100 qualified; however, its –40°C to +125°C operating range, 72 ppm/°C tempco, and production status make it suitable for non-safety-critical automotive subsystems (e.g., infotainment power rails). For AEC-Q100-compliant alternatives, contact Diodes Incorporated for qualified variants like AP431x series.