onsemi SA11ARLG

Overview

SA11ARLG from onsemi is a unidirectional MiniMOSORB Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power lines and signal paths. It features a 11 V working peak reverse voltage (VRWM), 500 W peak pulse power rating at 1.0 ms, clamping voltage of 18.2 V at 30.9 A peak pulse current, <1 µA leakage at VRWM, and sub-1 ns response time. It is used in industrial power supplies and medical equipment input protection.

For engineers reviewing the SA11ARLG datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ circuit operating voltage, clamping voltage margin relative to protected IC V_MAX, surge current capability under IEC 61000-4-5 waveforms, and UL 497B certification for isolated loop protection.

Technical Context

The SA11ARLG operates as a voltage-clamping device that remains non-conductive below its 11 V VRWM and rapidly avalanches above its 12.2–12.8 V breakdown voltage (V_BR @ 1 mA). Its low zener impedance and fast <1 ns response enable effective suppression of ESD (Class 3, >16 kV HBM) and lightning-induced surges.

It is rated for 500 W non-repetitive peak pulse power per 1.0 ms 10/1000 µs waveform, with thermal derating above 50°C ambient and junction-to-lead thermal resistance of 33.3°C/W. The device meets UL 497B requirements for isolated loop circuit protection and is packaged in Pb-free Surmetic axial leaded case 59AA.

Key Specifications

Pinout & Package

SA11ARLG is housed in an axial-leaded Surmetic plastic package (Case 59AA), with cathode identified by a polarity band. Leads are tin-plated, solderable at 260°C for 10 seconds at 1/16 inch from case. Mounting position is unrestricted.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ11A and P6KE11A, the SA11ARLG uniquely combines UL 497B certification, 500 W surge rating, and Pb-free axial packaging-making it the preferred choice for regulated industrial and medical power entry designs requiring audit-ready safety documentation.

Availability

SA11ARLG is available at Aetrix Electronics and suitable for industrial power supplies, medical equipment interfaces, and numerical control systems requiring stable component supply with full regulatory traceability and long-term lifecycle support.

Supply support for SA11ARLG 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, and IoT applications.

The SA5.0A Series-including SA11ARLG-is part of onsemi's MiniMOSORB TVS portfolio, engineered specifically for high-reliability transient suppression in safety-critical power and signal interfaces where UL recognition and surge robustness are mandatory.

FAQ

What is the working peak reverse voltage (VRWM) of the SA11ARLG?

The SA11ARLG has a working peak reverse voltage (VRWM) of 11 V, meaning it remains in high-impedance state up to this DC or continuous peak voltage. This value is selected to match nominal 12 V supply rails with sufficient margin for ripple and tolerance. Exceeding VRWM initiates avalanche conduction, and the SA11ARLG clamps transients at 18.2 V when subjected to its rated 30.9 A peak pulse current.

Does the SA11ARLG meet UL 497B requirements?

Yes, the SA11ARLG is UL recognized under standard UL 497B (File #E210057, QVGQ2 category) for isolated loop circuit protection. This certification covers performance in strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge testing-validating its suitability in safety-critical telecom and medical isolation barriers without requiring additional system-level qualification.

What is the maximum clamping voltage of the SA11ARLG and under what test condition?

The SA11ARLG has a maximum clamping voltage (V_C) of 18.2 V, measured at a peak pulse current (I_PP) of 30.9 A using the standard 1.0 ms 10/1000 µs waveform. This clamping level ensures protected downstream components-such as bridge rectifiers or primary-side controllers-experience no more than 18.2 V during surge events, preserving their safe operating area.

Is the SA11ARLG RoHS compliant and what package type does it use?

Yes, the SA11ARLG is Pb-free and RoHS compliant, supplied in onsemi's proprietary Surmetic axial leaded package (Case 59AA). This void-free, thermosetting plastic package features corrosion-resistant, readily solderable leads rated for 260°C for 10 seconds at 1/16 inch from the case body, supporting reliable through-hole assembly in high-volume industrial manufacturing.

How does the SA11ARLG compare to bidirectional TVS diodes in surge protection?

The SA11ARLG is unidirectional and optimized for DC line protection where polarity is fixed-e.g., +12 V supply rails-delivering tighter clamping and lower leakage (<1 µA) than equivalent bidirectional parts. Bidirectional variants (e.g., CA11A) are required only for AC-coupled or polarity-agnostic signals; using SA11ARLG in such cases would result in forward conduction during negative half-cycles and potential failure.