Diodes Incorporated AZ23C51-7

Overview

AZ23C51-7 from Diodes Incorporated is a dual common-anode 300mW surface-mount Zener diode with nominal Zener voltage 51V (48–54V range), maximum Zener impedance 100Ω at 5mA, temperature coefficient +0.110%/°C, and reverse leakage ≤0.1µA at 38V. It serves as precision voltage reference and overvoltage clamp in power supply feedback loops and analog sensor conditioning circuits.

For engineers reviewing the AZ23C51-7 datasheet, AZ23C51-7 pinout, AZ23C51-7 application, or AZ23C51-7 equivalent, key selection criteria include dual-Zener matching (ΔV_Z ≤5%), SOT23 thermal resistance (417°C/W), JEDEC-qualified reliability, AEC-Q101 HBM ESD rating (8kV), and RoHS-compliant green packaging.

Technical Context

This dual Zener operates in common-anode configuration: both cathodes are electrically isolated, sharing one anode terminal. Each Zener is rated for 5mA test current, with breakdown characteristics stable across −65°C to +150°C ambient.

Thermal derating follows a linear curve from 300mW at 25°C to zero at 150°C junction temperature. Capacitance is not specified per device but typical total capacitance for 51V parts is <2pF at 1V reverse bias, supporting high-frequency regulation stability.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount plastic package with matte tin-plated alloy 42 leadframe, UL 94V-0 rated, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C51LT1G and DZ23C51-7-F, AZ23C51-7 uniquely delivers matched dual Zeners in common-anode configuration - critical for space-constrained, high-precision dual-reference designs where inter-device tracking directly impacts measurement accuracy.

Availability

AZ23C51-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor modules, test equipment calibration circuits, and telecom line interface protection requiring stable component supply and AEC-Q101-compliant reliability.

Supply support for AZ23C51-7 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.

AZ23C51-7 belongs to the AZ23 series of dual Zener diodes engineered for high-reliability voltage reference and overvoltage protection in space-constrained surface-mount applications demanding tight parametric matching and automotive-grade qualification.

FAQ

What is the maximum reverse voltage before breakdown for AZ23C51-7?

The minimum Zener voltage is 48V at 5mA test current, and the device exhibits sharp breakdown onset above this threshold. At 38V reverse bias, leakage remains ≤0.1µA - confirming reliable blocking behavior well below nominal V_Z. Full breakdown occurs within the 48–54V range depending on unit variation and temperature.

Can AZ23C51-7 be used in place of a single 51V Zener diode?

Yes - either cathode (Pin 2 or Pin 3) can be used independently with the common anode (Pin 1) as ground reference, delivering full 51V regulation capability. The unused cathode must be left floating or tied to the same potential as the active cathode; it does not affect performance of the active channel.

Is AZ23C51-7 suitable for automotive under-hood applications?

Yes - it is qualified to AEC-Q101 with HBM ESD rating of 8kV, operates from −65°C to +150°C, and is manufactured in IATF 16949-certified facilities. Its green, halogen-free construction and moisture sensitivity level 1 further support robust automotive deployment without special handling.

How does the common-anode configuration affect PCB layout?

The common-anode configuration simplifies grounding: only one anode trace connects to system ground, reducing routing complexity. Both cathodes route separately to their respective loads. Thermal coupling between diodes is inherent, improving matching stability - but requires symmetric copper pour around the SOT23 pad to maintain uniform junction temperature.