AZ23C18-G3-08

Overview

The AZ23C18-G3-08 is a dual common anode silicon planar Zener diode array from the Vishay AZ23-G series, housed in a SOT-23 surface-mount package. It provides two independent Zener elements sharing a common anode terminal. The nominal Zener voltage is 18 V with a ±5% tolerance range of 17.10 V to 18.90 V at a test current of 5 mA. Maximum reverse leakage current is 50 nA at 14 V, and dynamic resistance is 45 Ω at 1 kHz. Power dissipation is rated at 300 mW on FR-4 boards, with an operating temperature range of -55 °C to +150 °C.

Feature Summary

• Dual common anode configuration for space-efficient circuit design
• Zener voltages graded according to international E24 standard
• ESD protection capability exceeding 8 kV via human body model
• Lead-free construction compliant with RoHS directives

Applications

• Voltage reference circuits requiring dual stable potentials
• Overvoltage protection for sensitive input lines
• Clamping applications in signal conditioning paths

Procurement Notes

Verify component authenticity by cross-referencing the marking code D61 against official Vishay documentation. Confirm that the G3 suffix indicates lead-free compliance and commercial grade material categorization. Ensure packaging specifications match the required reel size for automated assembly processes.

Selection Notes

Select this part when a dual Zener solution with a common anode topology is required within a compact SOT-23 footprint. The 18 V nominal rating suits applications needing precise clamping near standard logic supply rails. Consider thermal derating if ambient temperatures exceed typical operating ranges or if power dissipation approaches maximum limits.

Part Context

This device belongs to the AZ23-G series of small signal Zener diodes manufactured by Vishay General Semiconductor. The series offers a wide range of standardized voltage options from 2.2 V to 75 V in both 5% and 2% tolerance grades. The AZ23C18 variant specifically addresses mid-range voltage requirements using silicon planar technology optimized for high reliability.

Replacement Considerations

Parametric equivalents include AZ23C18-E3-08 and AZ23C18-G3-18. Verify pinout compatibility and electrical parameter alignment before substitution. Ensure replacement parts maintain the same common anode configuration and SOT-23 package dimensions.