Vishay General Semiconductor - Diodes Division SM15T150AHE3/57T

Overview

SM15T150AHE3/57T 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), 128 V stand-off voltage (V_WM), 143–158 V breakdown voltage (V_BR), and 207 V clamping voltage (V_C) at 7.2 A peak pulse current - used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial power electronics against lightning-induced and switching transients.

For engineers reviewing the SM15T150AHE3/57T datasheet, SM15T150AHE3/57T pinout, SM15T150AHE3/57T application, or SM15T150AHE3/57T equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low-inductance SMC package, and compliance with IEC 61000-4-5 surge immunity requirements for 12 V–48 V DC systems.

Technical Context

The SM15T150AHE3/57T employs a glass-passivated silicon junction optimized for fast response (<1 ps typical) to transient overvoltages, with clamping action triggered when reverse voltage exceeds 143 V (min) at 1 mA test current. Its thermal resistance (R_θJA = 75 °C/W) and R_θJL = 15 °C/W enable reliable operation under repeated surge stress when mounted on 8.0 mm × 8.0 mm copper pads.

As a unidirectional TVS, it conducts only during reverse overvoltage events - forward conduction is limited to 200 A single half-sine surge (10 ms). It exhibits <1 μA reverse leakage at 128 V and maintains stable clamping up to 150 °C junction temperature, meeting J-STD-020 MSL Level 1 reflow profile (260 °C peak).

Key Specifications

Pinout & Package

SM15T150AHE3/57T uses the SMC (DO-214AB) package: molded epoxy case with matte tin-plated leads, 0.305" × 0.220" body, cathode band marking on one end. Mounting requires 8.0 mm × 8.0 mm copper pads per terminal per JEDEC standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ150A-E3/57T and 1.5SMC150A, SM15T150AHE3/57T delivers 3.75× higher surge power handling and certified automotive reliability - critical for designs targeting ISO 7637-2 and IEC 61000-4-5 compliance in harsh environments.

Availability

SM15T150AHE3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial motor drives, telecom DC feeds, and consumer appliance control boards requiring stable component supply, full AEC-Q101 traceability, and guaranteed long-term lifecycle support.

Supply support for SM15T150AHE3/57T 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, TVS devices, and optoelectronics with emphasis on high-reliability, high-power, and automotive-qualified components.

The SM15T Series was engineered specifically for high-energy transient suppression in 12 V–220 V DC systems, combining AEC-Q101 qualification, 1500 W surge capacity, and SMC packaging to meet stringent automotive and industrial EMC requirements.

FAQ

What is the clamping voltage of SM15T150AHE3/57T at its rated peak pulse current?

The SM15T150AHE3/57T has a maximum clamping voltage (V_C) of 207 V at 7.2 A peak pulse current (I_PPM) under a 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. The SM15T150AHE3/57T maintains this clamping performance across its full operating temperature range (−65 °C to +150 °C).

Is SM15T150AHE3/57T suitable for automotive applications?

Yes, SM15T150AHE3/57T is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It meets stress tests including temperature cycling, high-temperature reverse bias (HTRB), and unbiased highly accelerated stress testing (UHAST), making it appropriate for engine control units, body electronics, and ADAS power supplies. The SM15T150AHE3/57T is listed in Vishay's automotive-grade product portfolio with full PPAP documentation support.

What does the "HE3/57T" suffix indicate in SM15T150AHE3/57T?

The "HE3" suffix denotes RoHS-compliant construction with AEC-Q101 qualification, while "57T" specifies packaging in 7-inch plastic tape-and-reel format with 850 units per reel. This ordering code confirms the part meets automotive reliability standards and is configured for high-volume SMT placement. The SM15T150AHE3/57T is distinct from commercial-grade variants (e.g., SM15T150A-E3/57T) which lack AEC-Q101 validation.

How does SM15T150AHE3/57T differ from bidirectional TVS diodes like SM15T150CA?

SM15T150AHE3/57T is unidirectional and features a cathode band marking; it conducts only during reverse overvoltage, behaving like a Zener in breakdown. In contrast, SM15T150CA is bidirectional (no polarity marking) and suppresses transients in both directions - suitable for AC lines or differential data buses. The SM15T150AHE3/57T offers tighter V_BR tolerance and lower leakage than its bidirectional counterpart at the same V_WM.

What is the thermal resistance of SM15T150AHE3/57T, and how does it affect layout?

The SM15T150AHE3/57T has a typical junction-to-ambient thermal resistance (R_θJA) of 75 °C/W and junction-to-lead (R_θJL) of 15 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain T_J ≤ 150 °C during surge events, PCB layout must provide adequate copper area and avoid thermal bottlenecks - the SM15T150AHE3/57T relies on direct pad conduction rather than airflow cooling.