Diodes Incorporated AZ432BNTR-G1

Overview

AZ432BNTR-G1 from Diodes Incorporated is a low-voltage (1.25V) adjustable precision shunt regulator in SOT-23-3 package, delivering 0.5% initial reference voltage accuracy (1.250 V), 20 ppm/°C typical temperature coefficient, and 0.05 Ω typical dynamic output impedance. It operates from -40°C to +125°C with cathode current capability up to 100 mA, serving as a Zener diode replacement in PC motherboard voltage regulation and switching power supply feedback loops.

For engineers reviewing the AZ432BNTR-G1 datasheet, AZ432BNTR-G1 pinout, AZ432BNTR-G1 application, or AZ432BNTR-G1 equivalent, this page provides verified functional identity, validated SOT-23 pin mapping, confirmed thermal stability specs, and real-world use cases in precision voltage setting and error amplification circuits.

Technical Context

The AZ432BNTR-G1 implements a bandgap-based precision reference core with internal op-amp and NPN pass transistor, enabling programmable output voltages from 1.25 V to 18 V via two external resistors. Its sharp turn-on characteristic and low 3 mV typical temperature deviation support stable closed-loop regulation across automotive-grade ambient ranges.

It functions as a 3-terminal shunt regulator where the REF pin senses the divided output, ANODE connects to system ground, and CATHODE sinks current into the feedback node of DC-DC controllers. The device maintains regulation down to 55 µA minimum cathode current and exhibits <0.1 µA off-state leakage at 18 V cathode voltage.

Key Specifications

Pinout & Package

AZ432BNTR-G1 is supplied in SOT-23 (3-pin) package with standard JEDEC MO-178 footprint. Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF. ANODE must be connected to system ground; REF connects to resistor divider midpoint; CATHODE sinks current into the controller's feedback node.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431BIDBZR and AS431ASTZTR-G1, AZ432BNTR-G1 delivers tighter 0.5% reference accuracy and lower 0.05 Ω impedance-critical for high-precision, low-noise feedback paths in modern computing power supplies.

Availability

AZ432BNTR-G1 is available at Aetrix Electronics and suitable for PC motherboard VRM design, USB-C PD adapter development, and industrial PLC power supply engineering requiring stable component supply and long-term sourcing continuity.

Supply support for AZ432BNTR-G1 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, computing, and consumer markets.

AZ432BNTR-G1 belongs to Diodes' precision shunt regulator product line, engineered specifically for high-accuracy, low-drift voltage reference applications in switching power supplies and motherboard power delivery networks.

FAQ

What is the minimum cathode current required for AZ432BNTR-G1 to maintain regulation?

The AZ432BNTR-G1 requires a minimum cathode current of 55 µA to sustain regulation at 25°C, rising to 80 µA across the full -40°C to +125°C operating range. This value is specified in the Electrical Characteristics table under IKA(Min) and reflects the lowest current needed to bias the internal reference core and op-amp reliably.

Can AZ432BNTR-G1 replace a standard Zener diode in existing designs?

Yes-AZ432BNTR-G1 replaces Zener diodes in feedback and reference applications by offering superior thermal stability (20 ppm/°C vs. 5000 ppm/°C for typical Zeners), lower dynamic impedance (0.05 Ω vs. 10–100 Ω), and programmable output from 1.25 V to 18 V. Its SOT-23 footprint matches many Zener packages, enabling drop-in upgrades without layout changes.

Does AZ432BNTR-G1 support capacitive loads without oscillation?

Yes-the AZ432BNTR-G1 is characterized for high stability under capacitive loads, including ≥10 µF ceramic output capacitance. Its internal compensation and low output impedance prevent phase shift-induced oscillation in common feedback configurations, eliminating the need for external compensation networks in most SMPS designs.

Is AZ432BNTR-G1 still in active production despite the "OBSOLETE" note in the datasheet?

No-AZ432BNTR-G1 is officially discontinued per Diodes' DS36803 Rev. 5-4 (April 2022). Aetrix Electronics holds remaining authorized inventory and supports last-time-buy programs, but recommends migration to the pin-compatible AZ431L series for new designs requiring ongoing supply assurance and extended lifecycle support.