Diodes Incorporated SMAZ6V8-13

Overview

SMAZ6V8-13 from Diodes Incorporated is a 1.0W surface-mount Zener diode with a nominal zener voltage of 6.8V (±5% tolerance), 2.0mA test current, 200Ω maximum zener impedance at I_ZT, and 4.0µA maximum reverse leakage at 5.0V. It uses an SMA package with cathode band polarity marking and is rated for operation from –65°C to +150°C, commonly deployed in voltage regulation and overvoltage protection circuits for power supply rails in industrial control modules.

For engineers reviewing the SMAZ6V8-13 datasheet, SMAZ6V8-13 pinout, SMAZ6V8-13 application, or SMAZ6V8-13 equivalent, key selection criteria include zener voltage accuracy, thermal resistance (R_θJA = 100°C/W), power derating above +50°C, reverse leakage at VR = 5.0V, and compatibility with automated SMT assembly on FR-4 PCBs.

Technical Context

This device operates as a precision voltage reference and clamp in DC bias networks, leveraging its stable 6.8V breakdown under controlled test current (I_ZT = 2.0mA). Its low dynamic impedance (Z_ZT ≤ 200Ω) ensures minimal regulation deviation across load variations.

The SMA package provides defined thermal performance: R_θJT = 30°C/W and R_θJA = 100°C/W when mounted per Diodes Inc.'s recommended pad layout on 1" × 0.85" FR-4. Power dissipation is derated linearly at 10mW/°C above +50°C ambient.

Key Specifications

Pinout & Package

Package: SMA (Surface Mount Assembly), molded plastic case with UL 94V-0 flammability rating, cathode identified by a visible band, weight ≈ 0.064g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C6V8-7-F and 1N4734A, SMAZ6V8-13 uniquely balances 1.0W SMT power handling, industry-standard SMA footprint, and thermal performance suitable for automated production of industrial power modules.

Availability

SMAZ6V8-13 is available at Aetrix Electronics and suitable for industrial power supply regulation, overvoltage protection circuits, and automotive body control module designs requiring stable component supply and RoHS-compliant sourcing.

Supply support for SMAZ6V8-13 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, headquartered in Plano, Texas, serving industrial, computing, consumer, and communications markets with high-reliability components.

The SMAZ series belongs to Diodes Inc.'s surface-mount Zener diode product line, engineered specifically for automated SMT assembly and stable voltage reference/clamp functions in compact power management circuits.

FAQ

What is the maximum reverse voltage (V_R) at which leakage current is specified for SMAZ6V8-13?

The datasheet specifies a maximum reverse leakage current of 4.0µA at V_R = 5.0V. This value is measured under standard test conditions (T_A = +25°C) and reflects the device's ability to hold off voltage below its nominal zener breakdown while drawing negligible current - critical for low-power bias networks.

Can SMAZ6V8-13 be used in parallel for higher power dissipation?

No - Zener diodes exhibit negative temperature coefficients and mismatched V_Z tolerances, causing current hogging when paralleled. The SMAZ6V8-13 is rated for 1.0W single-device operation; higher power must be achieved using active regulation or series-connected devices with balancing resistors, not direct parallel connection.

Is the SMAZ6V8-13 suitable for automotive AEC-Q200 qualification?

No - while the device operates across –65°C to +150°C, it is not AEC-Q200 qualified. Diodes Incorporated offers the AZ-series (e.g., AZ6.8) for automotive-grade Zener diodes. SMAZ6V8-13 is intended for commercial and industrial applications where full automotive qualification is not required.

What is the recommended PCB pad layout for optimal thermal performance?

Diodes Incorporated specifies a 1" × 0.85" FR-4 board with copper pad dimensions matching their official SMA outline (available at diodes.com/package-outlines.html). Use minimum 1.5mm² copper area per terminal and avoid thermal relief on cathode/anode pads to achieve the rated R_θJA = 100°C/W and prevent premature thermal derating.