Vishay General Semiconductor - Diodes Division P4SMA220CAHM3_A/H

Overview

P4SMA220CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) in SMA (DO-214AC) package, designed for clamping voltage transients on signal or power lines. It features 220 V breakdown voltage (V_BR = 209–231 V at 1 mA), 185 V maximum standoff voltage (V_WM), 328 A peak pulse current (I_PPM) under 10/1000 µs waveform, and 400 W peak pulse power rating - used to protect MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.

For engineers reviewing the P4SMA220CAHM3_A/H datasheet, P4SMA220CAHM3_A/H pinout, P4SMA220CAHM3_A/H application, or P4SMA220CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, low incremental surge resistance, and compatibility with automated SMT placement on standard PCB copper pads.

Technical Context

This device operates as a voltage-clamping protector with symmetrical avalanche behavior in both directions, enabling robust transient suppression without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while MSL Level 1 rating supports reflow soldering up to 260 °C peak.

The P4SMA220CAHM3_A/H delivers 400 W peak pulse power (10/1000 µs) at T_A = 25 °C, derating above 25 °C per Fig. 2, and maintains clamping voltage (V_C) ≤ 328 V at I_PPM, with thermal resistance R_θJA = 120 °C/W and R_θJL = 30 °C/W - critical for thermal management in compact layouts.

Key Specifications

Pinout & Package

Package: SMA (DO-214AC), surface-mount, bidirectional - no polarity marking; symmetrical terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ220CA and 1.5KE220CA, the P4SMA220CAHM3_A/H offers optimal balance of AEC-Q101 qualification, halogen-free compliance, and compact SMA footprint - making it preferred for new automotive and space-constrained industrial SMT designs requiring certified reliability.

Availability

P4SMA220CAHM3_A/H is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC I/O hardening, and telecom power rail safeguarding requiring stable component supply, full traceability, and lifecycle continuity.

Supply support for P4SMA220CAHM3_A/H 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 diodes, rectifiers, and protection devices with emphasis on reliability, efficiency, and application-specific performance.

The P4SMA Series was developed for high-reliability transient suppression in automotive, industrial, and telecom systems - delivering consistent clamping behavior, AEC-Q101 qualification, and robust SMT manufacturability.

FAQ

What is the clamping voltage of P4SMA220CAHM3_A/H at its rated peak pulse current?

The P4SMA220CAHM3_A/H has a maximum clamping voltage (V_C) of 328 V when subjected to its rated peak pulse current of 328 A under the 10/1000 µs waveform. This value is measured per standard test conditions (T_A = 25 °C, mounted on 5.0 mm × 5.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The P4SMA220CAHM3_A/H maintains this clamping performance consistently across its operational temperature range.

Is P4SMA220CAHM3_A/H suitable for automotive applications?

Yes, the P4SMA220CAHM3_A/H is AEC-Q101 qualified and specifically designated for automotive use with the "HM3" suffix indicating halogen-free, RoHS-compliant, and automotive-grade construction. It meets stress tests including temperature cycling, high-temperature reverse bias, and ESD per AEC-Q101 Rev D. The P4SMA220CAHM3_A/H is deployed in engine control units, body electronics, and ADAS sensor modules where transient immunity and long-term reliability are mandatory.

What does the "CA" suffix mean in P4SMA220CAHM3_A/H?

The "CA" suffix in P4SMA220CAHM3_A/H denotes a bidirectional configuration - meaning the device provides symmetrical transient suppression in both polarities, with identical V_BR, V_WM, and V_C characteristics in either direction. Unlike unidirectional variants (e.g., P4SMA220A), the P4SMA220CAHM3_A/H has no cathode band marking and is used where polarity of transient events cannot be guaranteed, such as across AC signal lines or differential buses like CAN or RS-485.

What is the standoff voltage rating for P4SMA220CAHM3_A/H?

The maximum standoff voltage (V_WM) for P4SMA220CAHM3_A/H is 185 V - the highest DC or RMS voltage that can be continuously applied without exceeding 1 µA reverse leakage current. This rating ensures minimal power loss and no false triggering during normal operation, while still allowing rapid avalanche conduction when transients exceed the 209–231 V breakdown range. The P4SMA220CAHM3_A/H is therefore appropriate for 150 V DC systems with safety margin.

Does P4SMA220CAHM3_A/H require special PCB layout considerations?

Yes - to achieve rated 400 W peak pulse power, the P4SMA220CAHM3_A/H must be mounted on minimum recommended copper pads: 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal, per Vishay's datasheet Fig. 1. Smaller pads reduce thermal dissipation and surge current handling, potentially causing premature failure. Trace inductance should also be minimized; the P4SMA220CAHM3_A/H must be placed as close as possible to the protected node with short, wide traces to preserve its <1 ns response time.