Diodes Incorporated SMAZ15-13

Overview

SMAZ15-13 from Diodes Incorporated is a 1.0W surface-mount Zener diode with a nominal zener voltage of 15.0V (±5% tolerance), 150Ω maximum zener impedance at 10mA test current, and 11.4V minimum knee voltage at 1.0mA. It features SMA package, lead-free RoHS-compliant plating, and is rated for -65°C to +150°C operation. It is used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.

For engineers reviewing the SMAZ15-13 datasheet, SMAZ15-13 pinout, SMAZ15-13 application, or SMAZ15-13 equivalent, key selection criteria include zener voltage accuracy, dynamic impedance at specified test current, power derating above +50°C, thermal resistance (RθJA = 100°C/W), and reverse leakage at rated voltage.

Technical Context

This device operates as a two-terminal voltage reference by maintaining a stable reverse breakdown voltage across its cathode-anode terminals under controlled current conditions. Its 15.0V nominal zener voltage is specified at IZT = 10mA with ±5% tolerance, and it exhibits 150Ω dynamic impedance (ZZT) at that condition.

The SMA package enables automated SMT assembly and provides RθJA = 100°C/W on FR-4 PCB per Diodes Inc. layout guidelines. Power dissipation is rated at 1.0W up to +50°C, derating linearly at 10mW/°C above that temperature.

Key Specifications

Pinout & Package

Package: SMA (Surface Mount Axial), molded plastic case with UL 94V-0 flammability rating, cathode identified by band or notch, 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-C15-7-F and 1N4744A, SMAZ15-13 uniquely balances 1.0W SMT capability, 150Ω impedance at 10mA, and industrial temperature range-making it optimal for automated production of ruggedized 24V system regulators.

Availability

SMAZ15-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive electronics, programmable logic controllers, and telecom line cards requiring stable component supply with full RoHS and green compliance.

Supply support for SMAZ15-13 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, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The SMAZ series belongs to Diodes Inc.'s high-reliability Zener diode product line, engineered specifically for surface-mount voltage regulation and transient suppression in harsh-environment industrial and automotive applications.

FAQ

What is the maximum reverse voltage (VR) at which IR ≤ 1.0 µA for SMAZ15-13?

The maximum reverse voltage at which reverse leakage remains ≤1.0 µA is 11.4V, as specified in the Electrical Characteristics table under "Maximum Reverse Current (IR @ VR)" for SMAZ15. This defines the practical lower limit of usable regulation range before significant leakage occurs.

Can SMAZ15-13 be used in parallel for higher power dissipation?

No - SMAZ15-13 should not be paralleled due to mismatched zener voltage tolerances (±5%) and thermal runaway risk. Each device must be individually current-limited. For >1.0W needs, use a single higher-rated Zener or switch to active regulation.

Is the SMAZ15-13 compatible with lead-free reflow profiles?

Yes - it features matte tin lead-free plating and meets MIL-STD-202 Method 208 solderability requirements. Its moisture sensitivity level is J-STD-020 Level 1, allowing exposure to ambient conditions indefinitely prior to reflow without baking.

How does the 100°C/W RθJA value translate to real-world PCB layout?

With 1.0W dissipation, RθJA = 100°C/W implies a 100°C junction-to-ambient rise - meaning TJ = TA + 100°C. To keep TJ ≤ +150°C, ambient must stay ≤ +50°C unless additional copper pour or thermal vias reduce effective RθJA per Diodes Inc.'s recommended pad layout.