Taiwan Semiconductor Corporation AZ23C22 RFG

Overview

AZ23C22 RFG from Taiwan Semiconductor is a dual SMD Zener diode in SOT-23 package, with nominal zener voltage 22 V (±5%), 300 mW power dissipation, and 55 Ω zener impedance at 5 mA test current - used for precision low-voltage stabilization in DC/DC converters and lighting control circuits.

For engineers reviewing the AZ23C22 RFG datasheet, AZ23C22 RFG pinout, AZ23C22 RFG application, or AZ23C22 RFG equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (420 °C/W), junction temperature range (–55 to +150 °C), leakage current (0.1 µA at 17 V), and RoHS/halogen-free compliance per IEC 61249-2-21.

Technical Context

This dual-element Zener diode integrates two independent 22 V zener junctions in a single SOT-23 package, enabling compact voltage reference or bidirectional clamping in space-constrained designs. It operates under pulse test conditions (5 ms) and meets J-STD-020 moisture sensitivity Level 1.

The device supports automated SMT assembly with matte tin-plated leads compliant to J-STD-002, and passes JESD201 Class 1A whisker testing. Its 8.85 mg mass and UL 94V-0 molding compound support high-reliability portable and industrial applications.

Key Specifications

Pinout & Package

Package: SOT-23 - surface-mount, 3-terminal plastic package with standard lead pitch (0.95 mm), footprint compatible with JEDEC TO-236AB.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener reference applications.

Compared with BZX79-C22 and MMBZ5242B, the AZ23C22 RFG uniquely delivers dual 22 V Zener functionality in one SOT-23 - reducing component count and PCB area while maintaining ±5% tolerance and 0.1 µA leakage at 17 V.

Availability

AZ23C22 RFG is available at Aetrix Electronics and suitable for DC/DC converter reference, LED driver voltage clamp, and adapter output regulation requiring stable component supply, halogen-free compliance, and SMT-ready packaging.

Supply support for AZ23C22 RFG 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, analog ICs, and protection components since 1979.

The AZ23 series is part of TSC's dual Zener diode product line, engineered for high-density voltage reference and clamping in consumer, industrial, and computing power systems.

FAQ

What is the exact zener voltage tolerance for AZ23C22 RFG?

The AZ23C22 RFG has a nominal zener voltage of 22 V with a tolerance of ±5%, meaning the actual measured V_Z falls between 20.8 V and 23.3 V at I_ZT = 5 mA. This tolerance is confirmed in the Electrical Specifications table on page 2 of the official TSC datasheet (Version D2001), and applies under standard pulse test conditions (5 ms).

Does AZ23C22 RFG contain two independent 22 V Zener diodes?

Yes, the AZ23C22 RFG integrates two separate 22 V Zener junctions in a single SOT-23 package, sharing a common cathode (Pin 2). Pins 1 and 3 serve as the anodes of each diode - enabling dual-channel referencing or bidirectional clamping without external pairing, as verified in the device's mechanical and electrical schematics.

What does the "RFG" suffix mean in AZ23C22 RFG?

The "RFG" suffix indicates the device is supplied in a 3K reel (7-inch diameter) with halogen-free green molding compound, compliant with IEC 61249-2-21. This distinguishes it from "RF" (same reel, standard compound) and "-D0" variants (tape-and-reel with different orientation or packaging specs), per TSC's Ordering Information table.

Is AZ23C22 RFG suitable for automotive under-hood applications?

The AZ23C22 RFG supports junction temperatures from –55 °C to +150 °C and meets JESD201 Class 1A whisker resistance, making it viable for under-hood use. However, TSC explicitly states these products are not designed for medical, life-saving, or life-sustaining applications - automotive qualification requires additional AEC-Q101 testing not covered in the base datasheet.

How does the thermal resistance of AZ23C22 RFG affect its power handling?

With a junction-to-ambient thermal resistance (R_θJA) of 420 °C/W, the AZ23C22 RFG dissipates only ~71 mW at 25 °C ambient before reaching its 150 °C max junction temperature. Derating is required above 25 °C - e.g., at 85 °C ambient, max usable power drops to ~155 mW - limiting sustained operation in thermally constrained layouts.