Taiwan Semiconductor Corporation P6SMB7.5A

Overview

P6SMB7.5A from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power lines and signal paths. It features a breakdown voltage range of 7.13–7.88 V at 10 mA, clamps to ≤11.3 V at 55 A peak pulse current, and maintains ≤1 μA reverse leakage at 6.4 V standoff voltage. It is used in AC-DC adapters and switching mode power supplies to protect downstream ICs from ESD and surge events.

For engineers reviewing the P6SMB7.5A datasheet, P6SMB7.5A pinout, P6SMB7.5A application, or P6SMB7.5A equivalent, key selection criteria include its DO-214AA (SMB) package compatibility, 600W peak pulse power rating, bidirectional capability with CA suffix variants, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.

Technical Context

The P6SMB7.5A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown behavior and low leakage. Its 10/1000 μs waveform response time is typically under 1.0 ps, enabling fast suppression of transients before sensitive circuitry is damaged.

Thermal performance is defined by a junction-to-case resistance of 10 °C/W and junction-to-ambient resistance of 55 °C/W, supporting operation from –55 °C to +150 °C. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards in its DO-214AA molded package.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, single-die unidirectional configuration with cathode band marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ7.5A and 1.5SMC7.5A, the P6SMB7.5A offers identical electrical protection in a smaller DO-214AA footprint, enabling higher-density layouts and better compatibility with compact adapter and monitor designs where space and thermal resistance are constrained.

Availability

P6SMB7.5A is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and television power boards requiring stable component supply and ISO 7637-2-compliant surge immunity.

Supply support for P6SMB7.5A 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

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and protection devices since 1979.

The P6SMB7.5A belongs to TSC's P6SMB series of 600W SMB-packaged TVS diodes, engineered specifically for cost-sensitive, high-volume consumer and industrial power supply protection with stringent automotive-grade surge compliance.

FAQ

What is the breakdown voltage tolerance of the P6SMB7.5A?

The P6SMB7.5A has a specified breakdown voltage range of 7.13 V to 7.88 V at 10 mA test current, corresponding to ±10% tolerance around the nominal 7.5 V rating. This tight V_BR window ensures consistent clamping behavior across production lots and supports predictable system-level surge margin design. The P6SMB7.5A achieves this via precision glass-passivated junction processing and 100% parametric screening.

Is the P6SMB7.5A suitable for bidirectional transient protection?

No - the P6SMB7.5A is unidirectional. For bidirectional protection, Taiwan Semiconductor offers the P6SMB7.5CA variant (with 'CA' suffix), which provides symmetrical clamping in both polarities. The P6SMB7.5A must be oriented with cathode toward the protected line and anode to ground; reverse polarity connection will not provide protection and may cause failure. Always verify polarity marking (cathode band) on the DO-214AA body before placement.

What is the maximum clamping voltage of the P6SMB7.5A under surge conditions?

The P6SMB7.5A clamps to a maximum of 11.3 V when subjected to its rated 55 A peak pulse current (10/1000 μs waveform). This value is guaranteed across temperature and lifetime, and represents the upper limit of voltage seen by downstream components during worst-case surge events. System designers use this V_C to verify that protected ICs remain within absolute maximum ratings - for example, ensuring 5 V logic ICs with 6 V abs max survive with adequate margin.

Does the P6SMB7.5A meet automotive surge immunity standards?

Yes - the P6SMB7.5A is explicitly validated to meet ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (supply disconnection and switching transients), and Pulse 3a/3b (capacitive coupled noise). Its 600 W peak pulse power rating and sub-1.0 ps response time enable robust protection in automotive body control modules, infotainment power supplies, and ADAS camera modules where conducted transients are common.

What is the thermal resistance profile of the P6SMB7.5A in its DO-214AA package?

The P6SMB7.5A exhibits a junction-to-case thermal resistance (R_θJC) of 10 °C/W and junction-to-ambient resistance (R_θJA) of 55 °C/W under standard JEDEC test conditions. These values allow the device to sustain full 600 W pulse power without exceeding its 150 °C maximum junction temperature, provided PCB copper area and airflow meet minimum layout guidelines. The P6SMB7.5A's low R_θJA makes it suitable for thermally constrained spaces like sealed adapter enclosures.