onsemi SA24ARLG

Overview

SA24ARLG from onsemi is a unidirectional 500 W peak power MiniMOSORB Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power rails and signal lines. It features a 24 V working peak reverse voltage (VRWM), 29.5 V maximum breakdown voltage (VBR), 38.9 V clamping voltage (VC) at 12.8 A peak pulse current (IPP), and <1 µA leakage at VRWM - used in industrial power supplies, medical equipment, and communication interfaces for robust overvoltage protection.

For engineers reviewing the SA24ARLG datasheet, pinout, applications, or equivalent options, key selection criteria include clamping performance under 1 ms surge, UL 497B certification for isolated loop protection, Pb-free axial leaded packaging (Case 59AA), and compatibility with manual or automated through-hole assembly processes requiring 230°C soldering tolerance.

Technical Context

The SA24ARLG operates as a unidirectional Zener-based TVS diode, leveraging avalanche breakdown to clamp transient voltages above its VRWM of 24 V. Its response time is typically <1.0 ns, enabling suppression of fast-rising ESD and lightning-induced surges before sensitive downstream circuitry is damaged.

It delivers 500 W nonrepetitive peak pulse power per 1.0 ms waveform (Figure 4), with thermal resistance junction-to-lead of 33.3 °C/W and steady-state power dissipation derated from 3.0 W at TL ≤ 75°C. The device meets Class 3 ESD rating (>16 kV HBM) and is UL 497B recognized for isolated loop circuit protection.

Key Specifications

Pinout & Package

SA24ARLG uses an axial-leaded Surmetic plastic package (Case 59AA, similar to DO-204AC/DO-15), with cathode indicated by a polarity band. Leads are corrosion-resistant, solderable, and rated for 230°C at 1/16 in. from case for 10 seconds.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Compared with SMAJ24A and P6KE27A, SA24ARLG uniquely combines UL 497B recognition, 500 W surge capability, and axial Pb-free packaging - making it the preferred choice for certified industrial and medical through-hole designs requiring regulatory traceability and mechanical robustness.

Availability

SA24ARLG is available at Aetrix Electronics and suitable for industrial power supplies, medical diagnostic equipment, and telecom infrastructure requiring stable component supply with full RoHS and UL compliance documentation.

Supply support for SA24ARLG 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The SA5.0A Series, including SA24ARLG, belongs to onsemi's MiniMOSORB TVS portfolio - engineered specifically for high-reliability, high-surge-capability overvoltage protection in safety-critical and regulated applications.

FAQ

What is the clamping voltage of SA24ARLG at its rated peak pulse current?

The SA24ARLG has a maximum clamping voltage (VC) of 38.9 V at 12.8 A peak pulse current (IPP), measured using the standard 1.0 ms exponential waveform per Figure 4 in the datasheet. This value defines the upper voltage limit imposed on protected circuitry during surge events and is critical for ensuring downstream ICs remain within absolute maximum ratings. SA24ARLG maintains this clamping performance across its qualified temperature range of −55°C to +175°C.

Is SA24ARLG certified for safety-critical isolation applications?

Yes, SA24ARLG carries UL 497B recognition (File #E116110, Category QVGV2) for isolated loop circuit protection - verified through Strike Voltage Breakdown, Endurance Conditioning, Dielectric Withstand, and Discharge testing. This certification explicitly permits its use in safety-isolated subsystems such as medical sensor interfaces and telecom line cards where regulatory compliance is mandatory. SA24ARLG is one of few axial TVS diodes with this specific UL listing.

What package type and lead finish does SA24ARLG use?

SA24ARLG uses the axial-leaded Surmetic plastic package designated Case 59AA (mechanically equivalent to DO-204AC/DO-15), with Pb-free matte tin-plated leads. It is rated for soldering at 230°C for 10 seconds at 1/16 inch from the case body. The cathode is marked by a visible polarity band, and the device is supplied in tape-and-reel format (5000 units per reel) under the "RLG" suffix designation.

How does SA24ARLG compare to SA24A in terms of environmental compliance?

SA24ARLG is the Pb-free variant of the SA24A series, fully compliant with RoHS Directive 2011/65/EU and JESD97. While SA24A uses standard SnPb leads, SA24ARLG substitutes matte tin plating and undergoes additional qualification for Pb-free soldering profiles. Both share identical electrical specifications, but only SA24ARLG carries the "G" suffix indicating Pb-free status and appears in onsemi's preferred devices list for new designs.

What is the maximum steady-state power dissipation for SA24ARLG?

SA24ARLG has a steady-state power dissipation (PD) of 3.0 W at lead temperature (TL) ≤ 75°C with 3/8-inch lead length, derating linearly at 30 mW/°C above that temperature. This rating applies to continuous DC or low-frequency reverse-bias conditions - distinct from its 500 W nonrepetitive peak pulse rating. Thermal design must ensure lead temperature remains within limits to avoid long-term parameter drift or premature failure. SA24ARLG's junction-to-lead thermal resistance is 33.3 °C/W.