Taiwan Semiconductor Corporation P6SMB170

Overview

P6SMB170 from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with a standoff voltage of 138 V, breakdown voltage range of 153–187 V, and clamping voltage of 244 V at 2.5 A peak pulse current. It uses a DO-214AA (SMB) package and is designed for overvoltage protection in DC power rails of switching mode power supplies and industrial adapters.

For engineers reviewing the P6SMB170 datasheet, P6SMB170 pinout, P6SMB170 application, or P6SMB170 equivalent, key selection criteria include its 600 W peak pulse power rating, 244 V clamping voltage under 10/1000 µs surge, low leakage (<1 µA @ 138 V), fast sub-nanosecond response, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics robustness.

Technical Context

The P6SMB170 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its minimum breakdown voltage of 153 V. Its glass-passivated junction ensures stable V_BR tolerance (±5% for 'A' variant; P6SMB170 is non-A, so ±10%) and low leakage (<1 µA @ V_WM = 138 V).

Thermally, it features R_θJC = 10 °C/W and R_θJA = 55 °C/W, enabling reliable operation up to T_J = 150 °C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, supporting lead-free reflow assembly without preconditioning.

Key Specifications

Pinout & Package

DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.090 g. Complies with UL 94V-0 flammability and JESD201 Class 2 whisker resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ170A and 1.5SMC170A, the P6SMB170 offers cost-effective 600 W protection in the smallest standardized SMB footprint, with verified ISO 7637-2 compliance and J-STD-020 Level 1 moisture handling-ideal for high-volume industrial power designs where AEC-Q200 is not mandated.

Availability

P6SMB170 is available at Aetrix Electronics and suitable for switching mode power supplies, industrial AC/DC adapters, and flat panel display power boards requiring stable component supply and consistent surge immunity performance.

Supply support for P6SMB170 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 industrial-grade surface-mount TVS portfolio, engineered for high-reliability DC rail protection in power conversion, automotive subsystems, and industrial equipment where robustness against ISO 7637-2 transients is mandatory.

FAQ

What is the maximum clamping voltage of the P6SMB170 under standard 10/1000 µs surge conditions?

The P6SMB170 has a maximum clamping voltage (V_C) of 244 V when subjected to its rated peak pulse current of 2.5 A using the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components experience no more than 244 V during such transients-critical for protecting 200 V-rated capacitors and controllers. The P6SMB170 achieves this with minimal voltage overshoot due to its sub-nanosecond response.

Is the P6SMB170 unidirectional or bidirectional, and how is polarity identified?

The P6SMB170 is a unidirectional TVS diode, intended for DC rail protection where reverse conduction is not required. Polarity is marked by a cathode band on the DO-214AA (SMB) package body-the banded end connects to the protected line (e.g., +138 V), while the anode connects to ground or return. Bidirectional variants use a 'C' or 'CA' suffix (e.g., P6SMB170C), which the P6SMB170 does not carry.

Does the P6SMB170 meet automotive surge immunity standards?

Yes, the P6SMB170 meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b-standard test waveforms for automotive 12 V and 24 V power networks. Its 600 W peak pulse rating, 244 V clamping, and low leakage (<1 µA @ 138 V) make it suitable for infotainment head units, body control modules, and ADAS power supplies where transient resilience is critical. Note: It is not AEC-Q200 qualified unless specified in a separate automotive-grade variant.

What is the thermal resistance profile of the P6SMB170, and how does it affect PCB layout?

The P6SMB170 has a junction-to-case thermal resistance (R_θJC) of 10 °C/W and junction-to-ambient (R_θJA) of 55 °C/W. These values assume standard JEDEC 2-layer board conditions. To maintain T_J ≤ 150 °C under worst-case surge duty, designers should provide ≥25 mm² copper pour connected to both terminals and avoid enclosing the device in thermally restrictive enclosures. The DO-214AA package's low mass (0.090 g) enables rapid heat dissipation during short-duration transients.

Can the P6SMB170 be used in place of the P6SMB170A, and what are the key differences?

No-P6SMB170 and P6SMB170A are not interchangeable without design review. The P6SMB170 has a V_BR range of 153–187 V (±10%), while P6SMB170A tightens this to 162–179 V (±5%). Clamping voltage differs too: 244 V vs. 234 V. The 'A' version also exhibits lower temperature coefficient (0.108 %/°C for both, per spec sheet). Use P6SMB170A where tighter V_BR tolerance is needed; retain P6SMB170 for cost-sensitive applications accepting wider variation.