Diodes Incorporated SMAZ9V1-13

Overview

SMAZ9V1-13 from Diodes Incorporated is a 1.0W surface-mount Zener diode with nominal zener voltage 9.1V (±5%), maximum zener impedance 200Ω at 4.0mA test current, and reverse leakage current ≤1.0µA at 7.0V. It features SMA package, lead-free RoHS-compliant plating, and is rated for operation from –65°C to +150°C. Used in voltage regulation and overvoltage protection circuits in power supplies and industrial control modules.

For engineers reviewing the SMAZ9V1-13 datasheet, SMAZ9V1-13 pinout, SMAZ9V1-13 application, or SMAZ9V1-13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (RθJA = 100°C/W), power derating above +50°C, cathode polarity marking, and compliance with halogen/antimony-free "Green" requirements.

Technical Context

This Zener diode operates in reverse breakdown mode to maintain stable reference voltage under varying load and temperature conditions. Its 9.1V nominal regulation is specified at IZT = 4.0mA with VZ tolerance ±5%, and it exhibits low dynamic impedance (ZZT = 200Ω) ensuring tight regulation in feedback paths.

The device uses a molded plastic SMA package with UL 94V-0 flammability rating and moisture sensitivity level 1. Thermal performance is characterized by RθJT = 30°C/W and RθJA = 100°C/W on standard FR-4 PCB layout, supporting reliable operation up to 150°C junction temperature.

Key Specifications

Pinout & Package

Package: SMA (Surface Mount Axial), molded plastic case with cathode band marking; dimensions: 4.60 × 2.92 × 1.63 mm (L × W × H); weight ≈ 0.064 g; UL 94V-0 rated; moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener diode voltage regulation applications.

Compared with BZX84-C9V1-7-F and 1N4739A, SMAZ9V1-13 delivers identical voltage accuracy in a RoHS-compliant, SMT-optimized package with superior thermal performance (RθJA = 100°C/W vs. ~200°C/W for SOT-23), making it ideal for high-reliability, volume-manufactured power regulation.

Availability

SMAZ9V1-13 is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU voltage reference, and LED driver current sensing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SMAZ9V1-13 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, specializing in high-reliability, application-optimized components for power management, signal integrity, and protection.

The SMAZ series belongs to Diodes' Zener diode product line, engineered specifically for surface-mount voltage regulation and transient clamping in space-constrained, thermally demanding applications such as industrial controls and automotive subsystems.

FAQ

What is the maximum allowable continuous power dissipation for SMAZ9V1-13 at +70°C ambient?

At +70°C ambient, SMAZ9V1-13 must be derated from its 1.0W rating at +25°C by 10mW/°C above +50°C. This yields 1.0W − (20°C × 0.01W/°C) = 0.8W maximum continuous power dissipation. Derating follows the linear curve in Figure 1 of DS18015 Rev. 19-2.

How is cathode polarity identified on the SMAZ9V1-13 package?

The cathode is marked with a distinct band or notch on the body end of the SMA package, consistent with industry-standard diode polarity identification. The marking code "ZHT" appears adjacent to the cathode band on the top surface, per the mechanical drawing and marking information in DS18015.

Does SMAZ9V1-13 meet JEDEC moisture sensitivity level (MSL) requirements for reflow soldering?

Yes, SMAZ9V1-13 is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/85% RH and requires no baking prior to standard Pb-free reflow profiles. This enables direct placement into high-volume SMT lines without dry-pack handling.

Can SMAZ9V1-13 replace SMAZ8V2 in an existing design without circuit modification?

No - SMAZ9V1-13 has a 9.1V nominal zener voltage versus 8.2V for SMAZ8V2, resulting in a 11% higher regulation point. Substitution would shift feedback voltage, potentially causing overvoltage or instability. Verify loop compensation and load regulation margins before any voltage-grade change.