Diodes Incorporated SMAZ36-13-F

Overview

SMAZ36-13-F from Diodes Incorporated is a 1.0W surface-mount Zener diode with a nominal zener voltage of 36.0V (±5%), 10mA test current, 40Ω maximum zener impedance at IZT, 0.5µA maximum reverse leakage at 27.4V, and SMA package. It provides precision voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial power converters.

For engineers reviewing the SMAZ36-13-F datasheet, SMAZ36-13-F pinout, SMAZ36-13-F application, or SMAZ36-13-F equivalent, key selection criteria include zener voltage tolerance, thermal resistance (RθJA = 100°C/W), power derating above +50°C, cathode polarity marking, and RoHS-compliant matte tin plating for lead-free reflow compatibility.

Technical Context

This device operates as a two-terminal voltage reference diode, conducting in reverse breakdown to maintain stable voltage across its terminals under specified current conditions. Its 36.0V nominal zener voltage is defined at 10mA test current (IZT), with differential impedance of ≤40Ω at IZT and ≤350Ω at knee current (IZK = 1.0mA).

Thermal performance is characterized by RθJA = 100°C/W on FR-4 PCB (1" × 0.85", 0.062" thick) and RθJT = 30°C/W, enabling 1.0W dissipation at +25°C ambient, linearly derated by 10mW/°C above +50°C per datasheet Note 5.

Key Specifications

Pinout & Package

Two-terminal device in SMA (DO-214AC) package: anode and cathode marked by molded cathode band on body. No internal pin numbering; polarity identified visually per JEDEC standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C36-7-F and 1N4738A, SMAZ36-13-F uniquely balances 1.0W SMT power handling, industry-standard SMA footprint, and full RoHS/halogen-free compliance-making it optimal for volume-manufactured industrial power modules requiring automated assembly and thermal reliability.

Availability

SMAZ36-13-F is available at Aetrix Electronics and suitable for industrial power supply feedback, overvoltage protection clamp, and reference voltage generator applications requiring stable component supply, consistent parametric performance, and full traceability.

Supply support for SMAZ36-13-F 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 centers across Asia and manufacturing in China, Taiwan, and the U.S.

The SMAZ series belongs to Diodes' high-reliability Zener diode product line, engineered specifically for precision voltage regulation and transient suppression in industrial, automotive, and telecom power systems.

FAQ

What is the maximum continuous reverse voltage (VR) that SMAZ36-13-F can withstand without breakdown?

The device is rated for 27.4V maximum reverse voltage (VR) at which leakage current remains ≤0.5µA. Breakdown occurs at nominal 36.0V (34.2–37.8V range) under 10mA test current. Operating continuously below VR ensures negligible conduction; exceeding VZ initiates controlled regulation.

How does the SMA package affect thermal performance compared to DO-41?

SMA (DO-214AC) has RθJA = 100°C/W on standard FR-4 PCB, versus ~50°C/W for DO-41 with heatsink. While DO-41 offers better absolute thermal resistance, SMA enables full SMT assembly, tighter layout control, and eliminates through-hole drilling-critical for high-density industrial PCBs where airflow and heatsinking are limited.

Can SMAZ36-13-F be used in place of SMAZ33-13-F in an existing design?

Yes, if the circuit tolerates a 3V higher zener voltage. SMAZ36-13-F has identical package, power rating, and thermal characteristics but shifts regulation point from 33V to 36V. Verify that downstream components (e.g., optocoupler CTR, error amplifier headroom) remain within safe operating margins at the new voltage level.

Is the cathode band orientation standardized across all SMAZ-series devices?

Yes. All SMAZ-series diodes use a single molded cathode band on the SMA package body, aligned per JEDEC DO-214AC standard. The band denotes the cathode terminal, and the opposite end is the anode-consistent across SMAZ5V1 through SMAZ39 variants for unambiguous automated placement.