Diodes Incorporated SMAZ22-13-F

Overview

SMAZ22-13-F from Diodes Incorporated is a 1.0W surface-mount Zener diode with nominal zener voltage of 22.0V (±5%), 25mA maximum zener test current, 180Ω maximum zener impedance at 15mA, and 0.5µA maximum reverse leakage at 16.7V. It is used for voltage regulation and overvoltage protection in DC power rails of industrial control modules, sensor signal conditioning circuits, and embedded power management subsystems.

For engineers reviewing the SMAZ22-13-F datasheet, SMAZ22-13-F pinout, SMAZ22-13-F application, or SMAZ22-13-F equivalent, key selection criteria include zener voltage tolerance, thermal resistance (RθJA = 100°C/W), power derating above +50°C, cathode polarity marking, and compatibility with automated SMT assembly on FR-4 PCBs.

Technical Context

This device operates as a precision shunt regulator, maintaining stable output voltage across varying load currents by conducting reverse breakdown current when applied reverse voltage exceeds its 22.0V nominal zener threshold. Its 1.0W power rating is specified at +25°C and derates linearly at 10mW/°C above +50°C.

The SMA package provides defined thermal performance: typical junction-to-terminal resistance is 30°C/W, enabling effective heat transfer to the PCB copper pad. Reverse leakage remains ≤0.5µA up to 16.7V (76% of VZ), ensuring low standby power loss in bias networks and reference circuits.

Key Specifications

Pinout & Package

The SMA package is a 2-terminal surface-mount device with cathode identified by a band or notch on the body. No internal pin numbering applies; terminals are anode (unmarked end) and cathode (banded end).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar zener regulation applications.

Compared with BZX84-C22LT1G and 1N4744A, SMAZ22-13-F uniquely delivers 1.0W SMT-compatible regulation at exactly 22V with verified thermal performance on standard FR-4, making it optimal for new industrial PCB designs requiring robust, automated assembly.

Availability

SMAZ22-13-F is available at Aetrix Electronics and suitable for industrial sensor interfaces, PLC input protection circuits, and embedded power monitoring systems requiring stable component supply with full traceability and lifecycle support.

Supply support for SMAZ22-13-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, specializing in high-reliability components for industrial, computing, and consumer markets.

The SMAZ series belongs to Diodes' precision Zener diode product line, engineered for stable voltage regulation in automated SMT environments where thermal performance and process compatibility are critical.

FAQ

What is the maximum continuous zener current for SMAZ22-13-F at +70°C ambient?

At +70°C ambient, the device must be derated from its 1.0W rating at +25°C. Derating begins at +50°C at 10mW/°C, so at +70°C the allowable power is 1.0W − (20°C × 10mW/°C) = 0.8W. With VZ ≈ 22V, maximum continuous current is 0.8W ÷ 22V ≈ 36.4mA - but electrical characteristics specify IZM = 45mA only at +25°C; sustained operation above 30mA at +70°C requires thermal validation per AN-1001 layout guidelines.

Does SMAZ22-13-F have AEC-Q200 qualification for automotive use?

No, SMAZ22-13-F is not AEC-Q200 qualified. While its operating temperature range (−65°C to +150°C) meets automotive junction limits, Diodes Incorporated does not list this part in its AEC-Q200-certified portfolio. For automotive applications, use the AEC-Q200 qualified AZ22 series (e.g., AZ22-13-F), which shares identical electrical specs but undergoes additional stress testing per the standard.

How is polarity identified on the SMAZ22-13-F package?

Polarity is marked by a distinct cathode band - a visible inked stripe near one end of the SMA molded plastic body. The banded end is the cathode; the opposite end is the anode. This marking complies with JEDEC standards and is machine-readable by vision-guided pick-and-place equipment during SMT assembly.

Can SMAZ22-13-F replace SMAZ20 or SMAZ24 in existing designs?

Direct replacement is not recommended without circuit revalidation. SMAZ20 has VZ = 20.0V (±5%) and SMAZ24 has VZ = 24.0V (±5%), resulting in ±2V difference versus SMAZ22's 22.0V nominal. This affects regulation accuracy, power dissipation distribution, and potential overvoltage margin in protection circuits - especially where downstream components have tight voltage tolerances.