Vishay General Semiconductor - Diodes Division SM15T220A-M3/9AT

Overview

SM15T220A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) in SMC (DO-214AB) package, rated for 1500 W peak pulse power (10/1000 μs), 328 V maximum clamping voltage at 4.6 A IPPM, and 188 V stand-off voltage - designed to protect MOSFETs, ICs, and sensor signal lines against lightning-induced and inductive-switching transients in automotive and industrial power electronics.

For engineers reviewing the SM15T220A-M3/9AT datasheet, SM15T220A-M3/9AT pinout, SM15T220A-M3/9AT application, or SM15T220A-M3/9AT equivalent, key selection criteria include verified clamping performance at rated IPPM, unidirectional polarity with cathode band marking, halogen-free RoHS compliance (M3 suffix), and SMC package thermal resistance (RθJL = 15 °C/W) for high-reliability board-level surge protection.

Technical Context

This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds 209–231 V breakdown (VBR at 1 mA), it avalanches to limit transient energy by diverting current away from downstream circuitry. Its low-inductance SMC package and glass-passivated junction ensure fast response (<1 ns) and stable clamping under repetitive 10/1000 μs surges.

Thermal design relies on RθJA = 75 °C/W (on 8 mm × 8 mm copper pads) and TJ max = 150 °C, enabling sustained operation in ambient temperatures up to +125 °C after derating. The device fails short-circuit under overstress - a predictable, system-diagnosable failure mode critical for safety-critical automotive applications.

Key Specifications

Pinout & Package

SM15T220A-M3/9AT uses the standard SMC (DO-214AB) package: a two-terminal, surface-mount device with cathode marked by a visible band on the body. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ220A-E3/57T, SM15T220A-M3/9AT delivers 275 % more surge energy handling in the same SMC footprint; versus SMCJ220A-M3/9AT, it shares identical clamping and thermal performance but originates from Vishay's dedicated high-power TransZORB® platform with documented AEC-Q101 qualification pathways.

Availability

SM15T220A-M3/9AT is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, and telecom DC power feeds requiring stable component supply, halogen-free compliance, and validated 1500 W surge immunity.

Supply support for SM15T220A-M3/9AT 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, power handling, and automotive qualification.

The SM15T Series was engineered specifically for high-energy transient suppression in harsh environments - targeting ISO 7637-2 and IEC 61000-4-5 compliance in automotive, industrial, and telecom infrastructure applications.

FAQ

What is the maximum clamping voltage of the SM15T220A-M3/9AT at its rated peak pulse current?

The SM15T220A-M3/9AT has a maximum clamping voltage (VC) of 328 V when subjected to its rated peak pulse current (IPPM) of 4.6 A under the standardized 10/1000 μs waveform. This value is measured per Figure 1 in Vishay document 88380 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within their absolute maximum ratings.

Is the SM15T220A-M3/9AT suitable for automotive applications requiring AEC-Q101 qualification?

The SM15T220A-M3/9AT itself is commercial-grade (M3 suffix), but it shares the same die, process, and package as the AEC-Q101-qualified HM3 variants (e.g., SM15T220AHM3_A/I). Vishay explicitly states that HM3 parts use identical construction and are qualified per AEC-Q101 - making SM15T220A-M3/9AT a direct precursor suitable for pre-qualification prototyping and production where full qualification is pending or not mandated.

What does the "M3" suffix indicate in SM15T220A-M3/9AT?

The "M3" suffix in SM15T220A-M3/9AT denotes halogen-free, RoHS-compliant construction meeting IPC-1752A material declaration standards. It also confirms compliance with JESD 201 Class 2 whisker resistance and JEDEC moisture sensitivity level (MSL) 1 - allowing safe single-reflow processing at 260 °C peak temperature without popcorn cracking.

How does the SMC (DO-214AB) package of the SM15T220A-M3/9AT compare thermally to smaller packages like SMA?

The SMC package of the SM15T220A-M3/9AT provides significantly better thermal performance than SMA: RθJL is 15 °C/W versus ~30 °C/W for SMA, and RθJA is 75 °C/W (on 8 mm × 8 mm pads) versus ~110 °C/W for SMA. This allows SM15T220A-M3/9AT to sustain higher surge energy and steady-state power dissipation - essential for protecting high-current rails in motor drives and power supplies.

Can the SM15T220A-M3/9AT be used in bidirectional configurations?

No - SM15T220A-M3/9AT is strictly unidirectional, indicated by the "A" suffix and cathode band marking. For bidirectional operation, Vishay specifies the "CA" suffix (e.g., SM15T220CA), which uses symmetrical breakdown in both polarities. Using SM15T220A-M3/9AT in reverse-biased AC applications would result in no clamping action and potential device failure.