AZ23B27-G3-18

Overview

The AZ23B27-G3-18 is a dual common anode silicon planar Zener diode array from the Vishay AZ23-G series, housed in a surface-mount SOT-23 package. It provides two independent Zener diodes sharing a common anode terminal. The nominal Zener voltage is 27 V with a tight tolerance of ±2%. Electrical characteristics are defined at a test current of 2 mA, featuring a maximum reverse leakage current of 50 nA and a dynamic resistance of 80 Ω. The device supports an operating temperature range from -55 °C to +150 °C and dissipates up to 300 mW on a standard FR-4 board.

Feature Summary

• Dual common anode configuration for space-efficient circuit design
• Tight voltage tolerance of ±2% for precision regulation applications
• High thermal stability across extended industrial temperature ranges
• Compliant with RoHS standards and manufactured using green commercial grade materials

Applications

• Voltage reference circuits requiring precise dual rails
• Overvoltage protection for sensitive signal lines
• Clamping applications in communication equipment
• Biasing networks in analog signal processing systems

Procurement Notes

Verify the complete ordering code matches the required specifications before procurement. Confirm that the suffix indicates the correct tape and reel quantity of 10,000 units per reel. Ensure compatibility with automated pick-and-place equipment utilizing 8 mm tape packaging. Cross-reference the manufacturer's latest datasheet revision to confirm current production status and any potential obsolescence notices.

Selection Notes

Select this component when a dual Zener array with high precision is required in a compact footprint. The ±2% tolerance distinguishes it from the standard ±5% 'C' graded variants. Verify that the 2 mA test current aligns with the target circuit's biasing requirements. Consider the 80 Ω dynamic resistance for noise-sensitive designs and ensure the SOT-23 thermal dissipation limits are respected under maximum load conditions.

Part Context

This part belongs to the AZ23-G series of small signal Zener diodes produced by Vishay General Semiconductor - Diodes Division. The series offers a wide range of Zener voltages from 2.2 V to 75 V in both ±5% and ±2% tolerances. The 'B' designation specifically denotes the tighter ±2% voltage tolerance grade compared to the standard 'C' grade devices within the same family.

Replacement Considerations

AZ23B27-E3-18

FAQ

What is the difference between the AZ23B27-G3-18 and AZ23C27-G3-18?

The primary difference is the voltage tolerance. The AZ23B27-G3-18 has a ±2% tolerance, while the AZ23C27-G3-18 has a standard ±5% tolerance. Both share the same electrical parameters, package, and testing conditions.

How does the common anode configuration function?

In this dual common anode configuration, the anodes of both Zener diodes are connected internally to Pin 2 (the middle pin). This allows the cathodes (Pin 1 and Pin 3) to be used independently for clamping or regulation against a shared positive supply rail.

What is the maximum power dissipation on an FR-4 board?

The maximum power dissipation is 300 mW when mounted on an FR-4 board with the recommended soldering footprint. The absolute maximum rating is 500 mW if the thermal resistance to lead is maintained at 250 K/W.