Vishay General Semiconductor - Diodes Division TPSMB27AHE3_A/H

Overview

TPSMB27AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for clamping inductive switching surges and lightning-induced transients on power rails and signal lines. It features a 27 V nominal breakdown voltage (V_BR), 23.1 V stand-off voltage (V_WM), 600 W peak pulse power (10/1000 µs), 16 A peak pulse current (I_PPM), and 37.5 V maximum clamping voltage (V_C) - deployed in automotive body control modules, industrial sensor interfaces, and DC power input protection.

For engineers reviewing the TPSMB27AHE3_A/H datasheet, TPSMB27AHE3_A/H pinout, TPSMB27AHE3_A/H application, or TPSMB27AHE3_A/H equivalent, this page delivers verified electrical parameters, SMB (DO-214AA) package details, AEC-Q101 qualification status, thermal derating curves, and direct alternative part comparisons for ESD/surge protection design-in.

Technical Context

The TPSMB27AHE3_A/H operates as a unidirectional avalanche diode with passivated anisotropic rectifier technology, enabling fast response (<1 ns) to transient overvoltages while maintaining low incremental surge resistance. Its 185 °C maximum junction temperature rating supports under-hood automotive environments and high-reliability industrial deployments where thermal margin is critical.

It is rated for 600 W peak pulse power per 10/1000 µs waveform at 25 °C, with derating above ambient per Figure 2; clamping occurs at ≤37.5 V when subjected to 16 A I_PPM, ensuring downstream ICs (e.g., microcontrollers, CAN transceivers, MOSFET gate drivers) remain within safe operating voltage limits during surge events.

Key Specifications

Pinout & Package

TPSMB27AHE3_A/H uses the SMB (DO-214AA) surface-mount package: cathode-indicating band at one end, matte tin-plated leads, UL 94 V-0 molding compound, and JEDEC-compliant solderability per J-STD-002/JESD 22-B102. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ27A, TPSMB27AHE3_A/H provides extended thermal margin and automotive qualification; versus TPSMB27AHM3_A/H, it offers identical performance with standard RoHS compliance-making it the default choice unless halogen-free materials are contractually required.

Availability

TPSMB27AHE3_A/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power supplies requiring stable component supply, AEC-Q101 validation, and high-temperature surge resilience.

Supply support for TPSMB27AHE3_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, TVS devices, and optoelectronics with emphasis on reliability, thermal performance, and automotive qualification.

The TPSMB series was developed specifically for high-reliability transient suppression in harsh environments - targeting automotive subsystems, industrial automation, and infrastructure equipment where surge immunity and long-term stability are mission-critical.

FAQ

What is the maximum clamping voltage of the TPSMB27AHE3_A/H under a 16 A surge?

The TPSMB27AHE3_A/H has a maximum clamping voltage (V_C) of 37.5 V when subjected to its rated 16 A peak pulse current (I_PPM) under the standard 10/1000 µs waveform. This value is measured at T_A = 25 °C and ensures protected circuitry remains below destructive voltage thresholds. The TPSMB27AHE3_A/H maintains this clamping performance across its full operating temperature range due to its low temperature coefficient (0.087 %/°C).

Is the TPSMB27AHE3_A/H qualified for automotive applications?

Yes, the TPSMB27AHE3_A/H is AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix "HE3". It meets rigorous automotive stress tests including high-temperature reverse bias (HTRB), temperature cycling, and human-body-model ESD (≥8 kV). This makes the TPSMB27AHE3_A/H suitable for under-hood and body-control applications where reliability under thermal and electrical stress is mandatory.

What does the "HE3" suffix indicate in TPSMB27AHE3_A/H?

"HE3" denotes a RoHS-compliant, AEC-Q101-qualified version of the TPSMB27A in SMB (DO-214AA) package. It specifies matte tin-plated leads, JESD 201 Class 2 whisker resistance, MSL Level 1 rating, and full automotive qualification. The "_A/H" further indicates packaging in 7" tape-and-reel format with 750 units per reel - a standard logistics configuration for automated SMT assembly of the TPSMB27AHE3_A/H.

How does the TPSMB27AHE3_A/H compare to bidirectional TVS diodes?

The TPSMB27AHE3_A/H is unidirectional and optimized for DC line protection where polarity is fixed - such as 24 V power rails or sensor supply lines. Unlike bidirectional variants, it provides lower leakage (<1 µA at 23.1 V) and tighter V_BR tolerance, improving system efficiency and noise margin. Bidirectional equivalents would exhibit higher leakage and less precise clamping in DC applications, making the TPSMB27AHE3_A/H the preferred choice for polarized circuits.

What is the thermal derating behavior of the TPSMB27AHE3_A/H above 25 °C ambient?

The TPSMB27AHE3_A/H follows the derating curve in Figure 2 of its datasheet: peak pulse power decreases linearly from 600 W at 25 °C to ~300 W at 125 °C ambient, with full capability retained up to 185 °C junction temperature. Designers must calculate actual junction temperature using thermal resistance (R_θJA ≈ 50 °C/W for standard PCB layout) and ensure T_J stays within limit - the TPSMB27AHE3_A/H's 185 °C rating allows significant margin even in high-power density layouts.