Diodes Incorporated SMAZ24-13-F

Overview

SMAZ24-13-F from Diodes Incorporated is a 1.0W surface-mount Zener diode with nominal zener voltage of 24.0V (±5% tolerance), 25mA maximum zener test current, 180Ω maximum zener impedance at 15mA, and 0.5µA maximum reverse leakage at 18.2V. It uses SMA package, features cathode band polarity marking, and is RoHS-compliant and halogen-free for automotive and industrial power regulation.

For engineers reviewing the SMAZ24-13-F datasheet, SMAZ24-13-F pinout, SMAZ24-13-F application, or SMAZ24-13-F equivalent, key selection criteria include zener voltage accuracy, thermal resistance (RθJA = 100°C/W), power derating above +50°C, reverse leakage at rated VR, and compatibility with automated SMT assembly on FR-4 PCBs.

Technical Context

This Zener diode operates in reverse breakdown to provide stable voltage reference or overvoltage protection. Its 24.0V nominal regulation is specified at IZT = 25mA, with ZZT ≤ 180Ω and ZZK ≤ 150Ω at low-current knee region, ensuring predictable clamping behavior across load and temperature variations.

Designed for surface-mount use on standard FR-4 boards, it delivers 1.0W power dissipation at TA = +25°C, derating linearly at 10mW/°C above +50°C. Thermal resistance from junction to ambient is 100°C/W, and junction-to-terminal is 30°C/W-critical for thermal design in compact power supplies and voltage-monitoring circuits.

Key Specifications

Pinout & Package

SMA (DO-214AC) package: molded plastic case (UL 94V-0), 0.064g weight, matte tin-plated terminals, moisture sensitivity level 1. Cathode identified by band; anode is unmarked end.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BZX84-C24LT1G and 1N5355B, SMAZ24-13-F uniquely balances 1.0W SMT power handling, industry-standard SMA footprint, and automotive-grade environmental compliance-making it optimal for new 24V industrial and automotive PCB designs requiring automated assembly and thermal predictability.

Availability

SMAZ24-13-F is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU voltage clamp, and programmable logic controller input protection requiring stable component supply and full RoHS/halogen-free compliance.

Supply support for SMAZ24-13-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, manufacturing, and sales operations across Asia, Europe, and North America.

The SMAZ series belongs to Diodes' high-reliability Zener diode product line, engineered specifically for voltage regulation and transient suppression in automotive, industrial, and telecom power systems operating up to +150°C junction temperature.

FAQ

What is the maximum continuous power dissipation for SMAZ24-13-F at +70°C ambient?

At +70°C ambient, SMAZ24-13-F is derated from its 1.0W rating at +25°C by 10mW/°C above +50°C. The derating delta is 20°C × 10mW = 200mW, resulting in a maximum continuous power dissipation of 800mW. This assumes mounting on a standard FR-4 PCB per Diodes' recommended pad layout.

Does SMAZ24-13-F have a specified capacitance value for high-frequency noise filtering?

No, the datasheet does not specify typical or maximum junction capacitance for SMAZ24-13-F. While Figure 2 shows capacitance curves for other SMAZ variants (e.g., SMAZ12, SMAZ27), no data point is provided for SMAZ24. For RF bypass or EMI filtering, a dedicated capacitor should be used in parallel.

Can SMAZ24-13-F be used in place of a 24V Zener in a linear regulator error amplifier feedback network?

Yes, but only if the feedback network draws ≤25mA and tolerates ±5% voltage variation. SMAZ24-13-F's 24.0V nominal VZ and 180Ω dynamic impedance ensure stable reference under moderate load, though its 100°C/W RθJA requires thermal-aware PCB layout to prevent drift at elevated ambient temperatures.

Is the cathode band on SMAZ24-13-F visible under standard AOI systems?

Yes-the cathode band is a molded, opaque black stripe on the SMA body, conforming to IPC-A-610 Class 2/3 visual inspection requirements. Its contrast and width (≥0.2mm) enable reliable detection by standard automated optical inspection systems used in SMT lines.