Vishay General Semiconductor - Diodes Division TPSMA43AHM3_B/H

Overview

TPSMA43AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 43 V breakdown voltage (V_BR), 59.3 V maximum clamping voltage (V_C) at 6.7 A peak pulse current, 400 W peak pulse power (10/1000 µs), 185 °C maximum junction temperature, and SMA (DO-214AC) package - used to safeguard MOSFETs and sensor interfaces in automotive ECUs.

For engineers reviewing the TPSMA43AHM3_B/H datasheet, TPSMA43AHM3_B/H pinout, TPSMA43AHM3_B/H application, or TPSMA43AHM3_B/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 36.8 V stand-off voltage, low incremental surge resistance, and halogen-free RoHS-compliant construction under JESD 201 Class 2 whisker test.

Technical Context

This TVS diode operates as a clamping device triggered by voltage transients exceeding its reverse standoff threshold (V_WM = 36.8 V), entering avalanche conduction to limit downstream voltage to ≤59.3 V during 10/1000 µs surges. Its passivated anisotropic rectifier structure ensures stable performance up to T_J = 185 °C, with <0.1 µA leakage at V_WM and 1.0 µA at 150 °C.

The device exhibits fast response time (<1 ns), low dynamic impedance (Z_PP ≈ 8.8 Ω derived from V_C/I_PPM), and meets MSL Level 1 per J-STD-020 (260 °C peak reflow). It is qualified to AEC-Q101 and rated for repetitive 0.01% duty cycle pulses on PCBs with 5.0 mm × 5.0 mm copper pads.

Key Specifications

Pinout & Package

SMA (DO-214AC) package: molded plastic case with matte tin-plated leads, cathode indicated by color band, compliant with UL 94 V-0 flammability rating and J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ43A and 1.5SMC43A, the TPSMA43AHM3_B/H offers optimal balance of AEC-Q101 qualification, halogen-free compliance, and compact SMA footprint - making it preferred for space-constrained automotive and consumer designs where 400 W clamping suffices.

Availability

TPSMA43AHM3_B/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, and telecom DC input protection requiring stable component supply across production lifecycles.

Supply support for TPSMA43AHM3_B/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 and high-temperature performance.

The TPSMA43AHM3_B/H belongs to Vishay's PAR® (Protected Avalanche Rectifier) TVS family, engineered specifically for high-reliability transient suppression in automotive, industrial, and telecom infrastructure where AEC-Q101 validation and 185 °C operation are mandatory.

FAQ

What is the exact breakdown voltage range specified for TPSMA43AHM3_B/H?

The TPSMA43AHM3_B/H has a guaranteed breakdown voltage (V_BR) range of 40.9 V to 45.2 V at 1.0 mA test current, per the Vishay datasheet Document Number 88405. This range reflects manufacturing tolerance and ensures consistent avalanche triggering behavior across production lots. The nominal value is 43.0 V, and the parameter is measured after applying IT for 300 µs using a square-wave pulse.

Is TPSMA43AHM3_B/H qualified for automotive applications?

Yes, TPSMA43AHM3_B/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and explicit notation in the Vishay datasheet. It meets the stress test requirements for automotive-grade discrete semiconductors, including temperature cycling, humidity bias, and mechanical shock - making it suitable for engine control units, body electronics, and ADAS sensor modules.

What does the "HM3" suffix indicate in TPSMA43AHM3_B/H?

The "HM3" suffix in TPSMA43AHM3_B/H denotes halogen-free, RoHS-compliant construction with JESD 201 Class 2 whisker resistance. It distinguishes this variant from HE3 (RoHS-compliant but not halogen-free) and confirms compliance with automotive and green electronics standards. The "B/H" indicates packaging in 7" tape-and-reel with 1800 units per reel.

What is the maximum clamping voltage of TPSMA43AHM3_B/H under standard test conditions?

The maximum clamping voltage (V_C) of TPSMA43AHM3_B/H is 59.3 V at 6.7 A peak pulse current with a 10/1000 µs waveform, as specified in the Electrical Characteristics table. This value represents the upper limit of voltage seen by protected circuitry during worst-case surge events and is critical for ensuring downstream ICs remain within absolute maximum ratings.

Can TPSMA43AHM3_B/H be used in bidirectional configurations?

No, TPSMA43AHM3_B/H is unidirectional only, as explicitly stated in the Vishay datasheet Features section. It conducts only in reverse avalanche mode and must be oriented with cathode toward the protected line. For bidirectional protection, a separate device such as TPSMA43CA or dual-diode array would be required - TPSMA43AHM3_B/H does not support symmetrical clamping.