Taiwan Semiconductor Corporation P6SMB82

Overview

P6SMB82 from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode designed for primary-side overvoltage protection in DC power rails. It features a breakdown voltage range of 73.8–90.2 V at 1 mA, clamps to ≤118 V at 5.3 A peak pulse current, and operates within -55°C to +150°C junction temperature. Used in switching mode power supplies and adapters to absorb ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.

For engineers reviewing the P6SMB82 datasheet, P6SMB82 pinout, P6SMB82 application, or P6SMB82 equivalent, key selection criteria include standoff voltage (66.4 V), clamping ratio (VC/VBR ≈ 1.3–1.4), thermal resistance (RθJA = 55°C/W), unidirectional polarity marking, and DO-214AA (SMB) package compatibility with automated SMT placement.

Technical Context

The P6SMB82 employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps rise time from 0 V to VBR min) and low leakage (<1 µA at 66.4 V). Its single-die unidirectional structure provides asymmetric conduction-low forward voltage (~3.5 V at 50 A) only in forward bias, while blocking up to 66.4 V in reverse standby.

Thermally, it delivers 600 W non-repetitive peak pulse power (10/1000 µs waveform) with junction-to-ambient thermal resistance of 55°C/W and junction-to-case of 10°C/W. Derating begins above 25°C ambient per Fig.2, maintaining safe operation up to 150°C TJ max.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, molded plastic case with matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Cathode indicated by band marking; polarity-critical for unidirectional operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ80A and 1.5SMC82A, the P6SMB82 delivers optimal balance of compact DO-214AA footprint, precise 66.4 V standoff, and 118 V clamping for cost-sensitive, volume-manufactured DC power rails-without over-specifying size or power rating.

Availability

P6SMB82 is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and flat panel TV power boards requiring stable component supply and full RoHS/halogen-free compliance.

Supply support for P6SMB82 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, including TVS diodes, rectifiers, and MOSFETs, with ISO 9001 and IATF 16949 certified facilities.

The P6SMB82 belongs to TSC's P6SMBxx(A) family of 600 W surface-mount TVS diodes engineered for high-reliability, high-volume industrial and consumer power conversion applications demanding ISO 7637-2 compliance and automated assembly compatibility.

FAQ

What is the maximum clamping voltage of the P6SMB82 under standard test conditions?

The P6SMB82 has a maximum clamping voltage (VC) of 118 V when subjected to its rated peak pulse current of 5.3 A using the 10/1000 µs waveform. This value is measured at the device terminals under TA = 25°C and defines the upper voltage limit imposed on protected circuitry during surge events. The P6SMB82 maintains this clamping performance consistently across its specified breakdown voltage range of 73.8–90.2 V.

Is the P6SMB82 suitable for automotive applications requiring ISO 7637-2 compliance?

Yes, the P6SMB82 is explicitly rated to meet ISO 7637-2 for Pulse 1, 2a, 2b, 3a, and 3b waveforms-making it appropriate for 12 V and 24 V automotive subsystems such as infotainment power supplies and body control modules. Its 66.4 V standoff voltage and 118 V clamping ensure compatibility with standard vehicle battery and alternator voltage ranges. The P6SMB82 achieves this while maintaining full RoHS and halogen-free compliance per IEC 61249-2-21.

What is the thermal resistance and how does it affect PCB layout for the P6SMB82?

The P6SMB82 has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case (RθJC) of 10°C/W. To sustain its full 600 W peak pulse rating at TA = 25°C, the device requires at least 1 cm² of 2-ounce copper connected to both terminals via thermal vias. Without adequate copper area, derating per Fig.2 applies-e.g., at 70°C ambient, maximum PPPM drops to ~400 W. The P6SMB82's DO-214AA package enables compact routing while meeting these thermal demands.

Does the P6SMB82 have polarity markings, and how is it oriented in circuit?

Yes, the P6SMB82 uses a cathode band marking on the DO-214AA package to indicate polarity. It is a unidirectional TVS diode: the banded end connects to the higher-potential node (e.g., VBUS or input rail), and the unbanded end connects to ground or return. Reverse orientation will cause catastrophic failure during normal operation. The P6SMB82's datasheet specifies forward voltage of 3.5 V at 50 A, confirming its intended unidirectional blocking/clamping behavior.

How does the P6SMB82 compare to the P6SMB82A variant?

The P6SMB82A offers a tighter breakdown voltage range (77.9–86.1 V vs. 73.8–90.2 V for P6SMB82) and slightly lower clamping voltage (113 V vs. 118 V at 5.5 A), achieved through enhanced process control. Both share identical package, thermal specs, and ISO 7637-2 compliance. The P6SMB82 is preferred where cost sensitivity outweighs narrow VBR tolerance needs; the P6SMB82A suits designs requiring stricter clamping consistency, such as precision 80 V intermediate bus protection. Neither variant is pin-compatible with bidirectional versions (e.g., P6SMB82CA).