Vishay General Semiconductor - Diodes Division TPSMA7.5HE3_A/I

Overview

TPSMA7.5HE3_A/I 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 and signal lines. It features a 7.5 V nominal breakdown voltage (V_BR), 400 W peak pulse power (10/1000 µs), 11.3 V maximum clamping voltage at 35.4 A peak pulse current, and operates up to +185 °C junction temperature - ideal for automotive power rail protection.

For engineers reviewing the TPSMA7.5HE3_A/I datasheet, TPSMA7.5HE3_A/I pinout, TPSMA7.5HE3_A/I application, or TPSMA7.5HE3_A/I equivalent, key selection criteria include unidirectional polarity, SMA (DO-214AC) package compatibility, AEC-Q101 qualification status, TJ = 185 °C thermal rating, and clamping performance under 10/1000 µs surge conditions.

Technical Context

This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional architecture provides fast response time and excellent clamping capability during transient events without forward conduction in normal operation.

Rated for 400 W peak pulse power with 0.01 % duty cycle and 40 A non-repetitive forward surge current (8.3 ms half-sine), it meets MSL Level 1 per J-STD-020 and supports reflow soldering up to 260 °C peak. The device is RoHS-compliant and AEC-Q101 qualified (HE3 suffix).

Key Specifications

Pinout & Package

SMA (DO-214AC) package: molded epoxy case with matte tin-plated leads, UL 94 V-0 flammability rating, and cathode indicated by color band. Mounting uses 0.2" × 0.2" (5.0 mm × 5.0 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 SMBJ7.0A and 1.5SMC7.0A, the TPSMA7.5HE3_A/I offers optimal balance of compact SMA footprint, AEC-Q101 qualification, and sufficient 400 W clamping for automotive and industrial signal/power line protection - making it preferred where space, qualification, and thermal constraints dominate.

Availability

TPSMA7.5HE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and consumer USB power delivery systems requiring stable component supply, AEC-Q101 compliance, and high-temperature reliability.

Supply support for TPSMA7.5HE3_A/I 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, MOSFETs, and protection devices with emphasis on reliability, thermal performance, and automotive-grade qualification.

The TPSMA7.5HE3_A/I belongs to Vishay's PAR® series of transient voltage suppressors, engineered specifically for high-temperature, high-reliability clamping in automotive and industrial power systems where sustained 185 °C operation and AEC-Q101 validation are mandatory.

FAQ

What is the exact breakdown voltage tolerance for TPSMA7.5HE3_A/I?

The TPSMA7.5HE3_A/I has a guaranteed breakdown voltage range of 7.13 V (min) to 7.88 V (max) at 10 mA test current, with 7.50 V nominal. This ±5 % tolerance is measured per ANSI/IEEE C62.35 and applies at T_A = 25 °C. Temperature coefficient is +0.052 %/°C, enabling accurate V_BR prediction across the full -65 °C to +185 °C operating range. The TPSMA7.5HE3_A/I maintains this specification under AEC-Q101 stress conditions.

Is TPSMA7.5HE3_A/I suitable for bidirectional transient protection?

No, the TPSMA7.5HE3_A/I is strictly unidirectional and must be oriented with its cathode toward the protected line. It does not provide symmetrical clamping for both positive and negative transients. For bidirectional protection, a dedicated bidirectional TVS such as the SMBJ7.0CA or TPSMA7.0CA would be required. Using TPSMA7.5HE3_A/I in reverse-biased configuration risks permanent damage due to lack of reverse avalanche capability.

Does TPSMA7.5HE3_A/I require derating at elevated ambient temperatures?

Yes, the TPSMA7.5HE3_A/I must be derated per Figure 2 in the datasheet: peak pulse power decreases linearly above T_A = 25 °C, reaching ~50 % of 400 W at T_A = 125 °C. The 185 °C maximum junction temperature remains valid, but thermal design must ensure sufficient copper pad area (0.2" × 0.2") and airflow to maintain T_J < 185 °C. Derating curves apply to both single-pulse and repetitive 0.01 % duty cycle conditions.

What does the "HE3" suffix signify in TPSMA7.5HE3_A/I?

"HE3" denotes Vishay's RoHS-compliant, AEC-Q101-qualified version with matte tin-plated leads, JESD201 Class 2 whisker resistance, and MSL Level 1 rating. The "_A/I" indicates packaging in 13" diameter plastic tape and reel (7500 units per reel). This suffix confirms full automotive qualification - distinct from non-HE3 variants that lack AEC-Q101 validation and may not meet automotive thermal or reliability requirements.

How does the clamping voltage of TPSMA7.5HE3_A/I compare to its breakdown voltage?

The TPSMA7.5HE3_A/I clamps at 11.3 V when subjected to its rated 35.4 A peak pulse current (I_PPM), which is ~50 % higher than its 7.5 V nominal breakdown voltage. This 3.8 V difference reflects the device's incremental surge resistance and ensures robust protection margin: even under worst-case surge, downstream components see no more than 11.3 V. Clamping occurs within < 1 ns, verified per IEC 61000-4-5 surge testing protocols.