Vishay General Semiconductor - Diodes Division SM5S22A-60HE3_A/I

Overview

SM5S22A-60HE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) in DO-218AB package, rated for 22 V standoff voltage (VWM), 25.7 V nominal breakdown voltage (VBR), and 3600 W peak pulse power (10/1000 μs). It delivers 101 A peak pulse current and operates up to 175 °C junction temperature, designed specifically for automotive load dump protection in 12 V systems.

For engineers reviewing the SM5S22A-60HE3_A/I datasheet, SM5S22A-60HE3_A/I pinout, SM5S22A-60HE3_A/I application, or SM5S22A-60HE3_A/I equivalent, key selection criteria include unidirectional clamping behavior, AEC-Q101 qualification, ISO7637-2 compliance, low leakage at 22 V (≤10 μA), and thermal resistance RθJM = 0.45 °C/W for heatsink-mounted designs.

Technical Context

This TVS diode uses passivated anisotropic rectifier technology with junction passivation optimized for high-reliability operation. Its unidirectional polarity and heatsink-as-anode configuration enable robust clamping during positive-going transients, such as automotive load dump events.

The device meets MSL Level 1 per J-STD-020 (245 °C peak reflow), features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and passes JESD 201 Class 2 whisker testing. Thermal performance is characterized by RθJA = 55 °C/W (FR4 PCB) and RθJM = 0.45 °C/W (heatsink interface).

Key Specifications

Pinout & Package

Package: DO-218AB - Surface-mount, single-ended case with integral metal heatsink acting as the anode terminal. Molding compound meets UL 94 V-0. Anode is electrically connected to the metal heatsink base; cathode is lead 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unidirectional TVS protection applications.

Compared with SM5S22A-60HE3_A/I, SM5S22AHM3_A/I offers identical electrical and thermal performance with updated qualification documentation, while SMAJ22AHE3_A/I provides compact footprint at the cost of 90 % lower surge power handling - making it unsuitable for automotive power rail protection.

Availability

SM5S22A-60HE3_A/I is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and ADAS camera power systems requiring stable component supply and AEC-Q101-compliant surge protection.

Supply support for SM5S22A-60HE3_A/I 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

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.

The SM5SxxA family is engineered for high-energy transient suppression in harsh automotive environments, with focus on load dump immunity, extended temperature operation, and AEC-Q101 validation - targeting power rail protection in ECUs, BCMs, and ADAS subsystems.

FAQ

What is the clamping voltage of the SM5S22A-60HE3_A/I at its rated peak pulse current?

The SM5S22A-60HE3_A/I has a maximum clamping voltage (VC) of 35.5 V at its specified peak pulse current (IPPM) of 101 A under the 10/1000 μs waveform. This value is measured per JEDEC standards and guarantees that protected circuitry downstream will not experience voltages exceeding 35.5 V during standardized surge events, ensuring compatibility with 3.3 V and 5 V logic interfaces.

Is the SM5S22A-60HE3_A/I suitable for ISO7637-2 Load Dump Pulse 5a compliance?

Yes, the SM5S22A-60HE3_A/I is explicitly rated for ISO7637-2 compliance, including Load Dump Pulse 5a (35 V, 400 ms), due to its 3600 W peak pulse power rating and 101 A surge current capability. Its thermal design - including RθJM = 0.45 °C/W and 175 °C junction rating - enables sustained energy absorption without thermal failure during this demanding automotive test condition.

What does the "HE3_A/I" suffix mean in SM5S22A-60HE3_A/I?

In SM5S22A-60HE3_A/I, "HE3" denotes RoHS-compliant, halogen-free construction with Pb-free matte tin plating and JESD 201 Class 2 whisker resistance; "A" is the revision code; and "I" indicates packaging in 13-inch plastic tape and reel with anode oriented toward sprocket holes. The "60" reflects the device's position in Vishay's internal ordering matrix, confirming DO-218AB packaging and AEC-Q101 qualification.

How is the anode terminal implemented in the SM5S22A-60HE3_A/I package?

The anode of the SM5S22A-60HE3_A/I is integrated into the metal heatsink base of the DO-218AB package - not a wire lead. This design provides both the primary electrical connection for surge current return and the dominant thermal conduction path. Proper PCB layout requires soldering the entire heatsink area to a large copper pour or direct metal chassis contact to achieve rated RθJM = 0.45 °C/W performance.

Does the SM5S22A-60HE3_A/I require derating at elevated ambient temperatures?

Yes, the SM5S22A-60HE3_A/I must be derated per its power derating curve (Fig. 2 in datasheet 88382). At 125 °C ambient, its power dissipation drops from 5 W to approximately 2.2 W on infinite heatsink; for surge ratings, the 3600 W PPPM applies only at TA = 25 °C. Engineers must apply junction temperature calculations using RθJA = 55 °C/W (PCB) or RθJM = 0.45 °C/W (heatsink) to ensure TJ remains ≤175 °C under worst-case conditions.