Taiwan Semiconductor Corporation P6SMB170C

Overview

P6SMB170C from Taiwan Semiconductor is a bidirectional 600W surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AA (SMB) package, designed for clamping high-energy transients in power rails and signal lines. It features a breakdown voltage range of 153–187 V at 1 mA test current, a maximum clamping voltage of 244 V at 2.5 A peak pulse current, and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements for automotive electronics.

For engineers reviewing the P6SMB170C datasheet, P6SMB170C pinout, P6SMB170C application, or P6SMB170C equivalent, key selection criteria include its bidirectional configuration (C suffix), 138 V standoff voltage, <1 µA reverse leakage at VWM, 1.0 ps response time, and compliance with J-STD-020 moisture sensitivity level 1 - critical for automated SMT assembly and harsh-environment reliability.

Technical Context

The P6SMB170C operates as a symmetrical avalanche diode, conducting equally in both polarities to suppress positive and negative voltage transients without requiring external polarity management. Its glass-passivated junction ensures stable breakdown characteristics over temperature, with a VBR temperature coefficient of 0.108 %/°C and TJ max rated at +150°C.

It delivers 600 W non-repetitive peak pulse power under 10/1000 µs waveform, with thermal resistance R_θJA = 55 °C/W enabling effective heat dissipation in compact PCB layouts. The device is optimized for unidirectional or bidirectional use - the "C" suffix explicitly denotes bidirectional functionality per manufacturer ordering code conventions.

Key Specifications

Pinout & Package

DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional operation renders band non-functional but retained for mechanical consistency). Weight ≈ 0.090 g. Meets UL 94V-0 flammability rating and JESD 201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ170CA and 1.5SMC170CA, the P6SMB170C offers optimal balance of cost, footprint, and certified 600 W performance - making it ideal for high-volume automotive and industrial applications where precise surge energy matching is required without over-engineering.

Availability

P6SMB170C is available at Aetrix Electronics and suitable for automotive power distribution, industrial SMPS input protection, and consumer display power rails requiring stable component supply and full compliance with ISO 7637-2 and RoHS directives.

Supply support for P6SMB170C 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 Company (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs for industrial and automotive markets.

The P6SMB series was developed to deliver high-reliability, AEC-Q200–capable transient suppression in compact SMB packages - targeting cost-sensitive yet mission-critical applications in automotive body electronics and industrial control systems.

FAQ

What does the "C" suffix indicate in P6SMB170C?

The "C" suffix in P6SMB170C explicitly denotes bidirectional configuration - meaning the device functions identically for both positive and negative transients without polarity dependence. This is confirmed in the manufacturer's ordering information and electrical specifications table, where "C or CA suffix" is defined for bipolar use across the P6SMB6.8–P6SMB220A family. The P6SMB170C has no anode/cathode distinction in operation.

Is P6SMB170C compliant with automotive transient standards?

Yes, the P6SMB170C meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements as stated in its official features list. These pulses simulate real-world automotive electrical disturbances including battery disconnect, inductive load switching, and capacitive coupling events. While not AEC-Q200 tested per se, its construction (glass-passivated junction, J-STD-020 Level 1, 150°C TJ max) supports automotive-grade deployment when validated in system-level testing.

What is the maximum clamping voltage of P6SMB170C under surge conditions?

The maximum clamping voltage (V_C) of the P6SMB170C is 244 V at a peak pulse current (I_PPM) of 2.5 A, measured using the standard 10/1000 µs waveform. This value is specified in the Electrical Specifications table for the P6SMB170 variant and applies identically to the P6SMB170C due to identical die construction and bidirectional symmetry - ensuring predictable voltage limiting during surge events.

Can P6SMB170C be used in place of unidirectional P6SMB170A?

No - the P6SMB170C and P6SMB170A are functionally distinct: the "C" suffix indicates bidirectional operation, while "A" denotes unidirectional with cathode marking. Substituting P6SMB170C for P6SMB170A introduces symmetrical conduction that may disrupt DC biasing or cause unintended current paths. Always match suffixes: use P6SMB170C only where bidirectional clamping is required, and verify layout polarity markings accordingly.

What is the thermal resistance profile of P6SMB170C?

The P6SMB170C has a junction-to-case thermal resistance (R_θJC) of 10 °C/W and junction-to-ambient resistance (R_θJA) of 55 °C/W, per the Thermal Performance section. These values assume standard PCB mounting with minimal copper; actual R_θJA improves significantly with ≥1 in² of 2-oz copper connected to both terminals. This thermal profile supports continuous operation up to +150°C junction temperature under rated power dissipation.