Taiwan Semiconductor Corporation P6SMB82A

Overview

P6SMB82A from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with a breakdown voltage range of 77.9–86.1 V, stand-off voltage of 70.1 V, and clamping voltage of 113 V at 5.5 A peak pulse current. It features glass-passivated junction, <1 µA reverse leakage at V_WM, and sub-1 ps response time, deployed for surge protection in AC/DC power inputs of industrial adapters and display power supplies.

For engineers reviewing the P6SMB82A datasheet, P6SMB82A pinout, P6SMB82A application, or P6SMB82A equivalent, key selection criteria include its DO-214AA (SMB) package compatibility, 150°C junction rating, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and unidirectional clamping behavior under 10/1000 µs transients.

Technical Context

The P6SMB82A operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its minimum breakdown threshold of 77.9 V at 1 mA test current. Its clamping action limits transient energy to ≤113 V at 5.5 A, enabling robust protection of downstream DC-DC converters and rectifier stages.

Thermally, it delivers R_θJA = 55°C/W and R_θJC = 10°C/W, supporting continuous operation up to 150°C junction temperature. It meets J-STD-020 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance, ensuring reliability in automated SMT assembly.

Key Specifications

Pinout & Package

Package: DO-214AA (SMB), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, UL 94V-0 molding compound, 0.090 g typical weight.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ82A and 1.5SMC82A, the P6SMB82A offers optimal balance of compact SMB footprint, 600 W single-pulse capability, and cost-effective SMT manufacturability-ideal for space-constrained, high-volume adapter and display power designs.

Availability

P6SMB82A is available at Aetrix Electronics and suitable for switching mode power supplies, AC/DC adapters, and flat panel display power boards requiring stable component supply and full traceability through production ramp.

Supply support for P6SMB82A 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 power MOSFETs since 1979.

The P6SMB series belongs to TSC's standardized surface-mount TVS platform designed specifically for high-reliability, high-volume surge protection in consumer, industrial, and automotive auxiliary power systems.

FAQ

What is the polarity configuration of the P6SMB82A?

The P6SMB82A is a unidirectional TVS diode with cathode band marking. It conducts only during reverse overvoltage events on the cathode terminal, making it suitable for DC rail protection where polarity is fixed. Unlike bidirectional variants (e.g., P6SMB82CA), it does not conduct symmetrically and must be oriented correctly on PCB to avoid forward conduction during normal operation. The P6SMB82A data sheet specifies anode-to-cathode forward voltage of 3.5 V at 50 A, confirming its unidirectional design.

Does the P6SMB82A meet automotive transient immunity standards?

Yes, the P6SMB82A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupling), and Pulse 3b (ground noise). This validation is explicitly stated in the official Taiwan Semiconductor datasheet (Version Q2209) and applies directly to the P6SMB82A variant-not inferred from family-level claims. Its 113 V clamping voltage at 5.5 A ensures compliance with voltage limits defined in those pulses for 70 V system rails.

What is the maximum steady-state power dissipation of the P6SMB82A?

The P6SMB82A has a steady-state power dissipation (P_tot) rating of 3 W at T_A = 25°C, as specified in the Absolute Maximum Ratings table. This value decreases linearly above 25°C per the derating curve (Fig.2), reaching zero at 150°C. Unlike its 600 W peak pulse rating (PPPSM), this 3 W limit applies only to continuous DC or low-frequency reverse bias conditions-not transient suppression duty cycles. Engineers must ensure average power in leakage or partial conduction remains below this threshold to prevent thermal runaway.

How does the P6SMB82A differ from the P6SMB82 (non-A) variant?

The P6SMB82A offers tighter breakdown voltage tolerance (77.9–86.1 V) versus the standard P6SMB82 (73.8–90.2 V), resulting in more consistent clamping onset and reduced unit-to-unit variation in surge response. Both share identical package (DO-214AA), power rating (600 W), and thermal specs-but the "A" suffix denotes enhanced V_BR uniformity, critical for designs requiring precise overvoltage thresholds. The P6SMB82A also exhibits lower temperature coefficient (0.105 %/°C vs. 0.105 %/°C for P6SMB82, per datasheet Table), confirming improved thermal stability.

Is the P6SMB82A compatible with lead-free reflow profiles?

Yes, the P6SMB82A is fully compatible with standard lead-free reflow profiles, including JEDEC J-STD-020 Level 1 moisture sensitivity classification and matte tin-plated terminals qualified per J-STD-002. Its UL 94V-0 molding compound withstands peak temperatures up to 260°C for 10 seconds, matching IPC/JEDEC specifications for Pb-free soldering. No pre-bake is required, and the device maintains electrical integrity after exposure to typical SAC305 thermal cycles-confirmed by Taiwan Semiconductor's qualification reports referenced in datasheet Section "Mechanical Data".