AZ23B51-E3-18

Overview

The AZ23B51-E3-18 is a dual common anode Zener diode array manufactured by Vishay General Semiconductor - Diodes Division. It features a nominal Zener voltage of 51 V with a tight tolerance of ±2%. The device operates within a test current range of 2 mA to 5 mA and maintains a maximum reverse leakage current of 0.05 µA at 38 V. Electrical performance includes a dynamic resistance (ZZ) of 100 Ω at IZT1 and 400 Ω at IZT2, alongside a temperature coefficient ranging from 10 to 12 x 10⁻⁴/°C. Designed for surface mount applications in the SOT-23 package, it supports power dissipation up to 500 mW and functions reliably across an operating temperature range of -55 °C to +150 °C.

Feature Summary

• Dual common anode configuration providing two independent Zener references in a single compact package.
• High precision voltage grading with ±2% tolerance indicated by the 'B' designation in the ordering code.
• Robust ESD protection capability exceeding 8 kV via human body model and 800 V via machine model.
• RoHS-compliant commercial grade construction utilizing silicon planar technology.

Applications

• Precision voltage reference circuits requiring dual stable potentials.
• Overvoltage protection stages for sensitive input lines.
• Clamping applications in signal conditioning networks.

Procurement Notes

Verify that the specific part number matches the required ±2% tolerance variant, as the 'B' suffix denotes this tighter specification compared to the standard 'C' variant. Confirm the '-18' suffix corresponds to the 10,000-unit reel packaging format intended for automated surface mount assembly processes. Ensure compliance with RoHS3 standards if environmental regulations apply to the final equipment design.

Selection Notes

Select this component when precise dual voltage regulation is necessary within space-constrained designs. The SOT-23 footprint allows for high-density PCB layouts while maintaining thermal stability up to 150 °C. Engineers should account for the specific dynamic resistance values at different test currents to ensure accurate clamping behavior under varying load conditions in the target application circuit.

Part Context

This device belongs to the AZ23 series of small signal Zener diodes produced by Vishay Semiconductors. The series encompasses a wide range of Zener voltages from 2.2 V to 75 V, offering both ±5% and ±2% tolerance options. These arrays are designed for general-purpose electronic applications requiring reliable voltage referencing or protection in compact surface-mount form factors.

Replacement Considerations

AZ23B51-E3-08

FAQ

What is the marking code for the AZ23B51?

The marking code for the AZ23B51 is DG2.

How does the tolerance differ between AZ23B and AZ23C variants?

The AZ23B variant offers a ±2% Zener voltage tolerance, whereas the AZ23C variant provides a standard ±5% tolerance.

What is the maximum reverse leakage current specified for this part?

The maximum reverse leakage current is specified as 0.05 µA when measured at a reverse voltage of 38 V.