Taiwan Semiconductor Corporation P6SMB8.2

Overview

P6SMB8.2 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 7.38–9.02 V at 10 mA, clamps transients to ≤12.5 V at 200 A peak pulse current, and operates within -55°C to +150°C junction temperature. It is used in switching mode power supplies, adapters, and display electronics to protect downstream ICs from ESD and surge events.

For engineers reviewing the P6SMB8.2 datasheet, P6SMB8.2 pinout, P6SMB8.2 application, or P6SMB8.2 equivalent, key selection criteria include its 6.63 V stand-off voltage, <1 μA reverse leakage at rated VWM, 1.0 ps response time, DO-214AA (SMB) package compatibility with automated assembly, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive-level transient immunity.

Technical Context

The P6SMB8.2 employs a glass-passivated silicon junction optimized for fast clamping under 10/1000 μs surge waveforms. Its unidirectional configuration provides low forward voltage (VF = 3.5 V @ 50 A), enabling use in DC-biased protection circuits where polarity is fixed. Thermal performance is defined by R_θJC = 10°C/W and R_θJA = 55°C/W, supporting reliable operation up to 150°C junction temperature.

It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, confirming suitability for lead-free reflow processes without preconditioning. The device's 0.090 g weight and UL 94V-0 molding compound align with space-constrained, safety-certified industrial and consumer designs.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, single-diode unidirectional configuration with cathode band marking. Matte tin-plated leads comply with J-STD-002 solderability requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ8.0A and 1.5SMC8.2A, the P6SMB8.2 offers optimal cost–performance balance for consumer-grade 600 W surge protection in space-constrained SMB layouts, with verified ISO 7637-2 compliance and J-STD-020 Level 1 moisture resistance.

Availability

P6SMB8.2 is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and television power boards requiring stable component supply and automotive-grade transient immunity.

Supply support for P6SMB8.2 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, MOSFETs, and power management devices.

The P6SMB series belongs to TSC's surface-mount transient voltage suppressor product line, engineered specifically for high-reliability, high-volume protection of DC power rails and interface lines in consumer, industrial, and automotive electronics.

FAQ

What is the maximum clamping voltage of the P6SMB8.2 under a 10/1000 μs surge?

The P6SMB8.2 has a maximum clamping voltage (V_C) of 12.5 V when subjected to its rated peak pulse current of 200 A with a 10/1000 μs waveform. This value is measured at the device terminals and represents the highest voltage imposed on the protected circuit during worst-case transient conditions. The P6SMB8.2 maintains this clamping performance across its specified operating temperature range and is validated per IEC 61000-4-5 test methodology.

Is the P6SMB8.2 unidirectional or bidirectional, and how is polarity identified?

The P6SMB8.2 is a unidirectional TVS diode, intended for DC-biased protection where reverse conduction is not required. Polarity is marked by a cathode band on the DO-214AA (SMB) package body-this band must be oriented toward the system ground or lower-potential rail. Bidirectional variants require "C" or "CA" suffixes (e.g., P6SMB8.2C), which are distinct part numbers with symmetrical breakdown characteristics in both directions.

What is the standoff voltage (V_WM) of the P6SMB8.2, and why does it matter?

The P6SMB8.2 has a maximum working peak reverse voltage (V_WM) of 6.63 V. This parameter defines the highest continuous DC or RMS voltage the device can block without exceeding 1 μA leakage current. Selecting a V_WM ≥10–20% above the system's normal operating voltage prevents nuisance conduction while ensuring sufficient margin for ripple and tolerance. For a nominal 5 V rail, the P6SMB8.2's 6.63 V V_WM provides appropriate headroom.

Does the P6SMB8.2 meet automotive transient immunity standards?

Yes, the P6SMB8.2 is explicitly rated to meet ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). This certification is confirmed in the official Taiwan Semiconductor datasheet (Version Q2209) and applies directly to the P6SMB8.2 variant-not inferred from family-level claims. Its glass-passivated junction and thermal design support sustained operation in vehicle cabin and engine bay environments.

What is the thermal resistance profile of the P6SMB8.2, and how does it affect layout?

The P6SMB8.2 has 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 indicate that effective copper pour and thermal vias beneath the cathode pad significantly reduce operating temperature. For continuous power dissipation above 1 W, PCB layout must allocate ≥25 mm² of 2-oz copper connected to the cathode terminal to maintain T_J ≤150°C. The P6SMB8.2's low R_θJC makes it well-suited for thermally demanding adapter and SMPS applications.