Taiwan Semiconductor Corporation P6KE170

Overview

P6KE170 from Taiwan Semiconductor is a unidirectional 600W transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 170V nominal breakdown voltage (VBR min/max: 153V–187V), 138V stand-off voltage (VWM), 2.5A peak surge current (IPP), and clamps transients to ≤244V at rated surge. It is used in automotive body electronics, industrial PLC I/O modules, and AC/DC adapter input stages to absorb lightning-induced or inductive-switching surges.

For engineers reviewing the P6KE170 datasheet, P6KE170 pinout, P6KE170 application, or P6KE170 equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD max, leakage current (<1μA at 138V), thermal derating above 25°C, and DO-15 mechanical compatibility with high-density PCB layouts.

Technical Context

The P6KE170 operates as a silicon avalanche diode with fast turn-on response (<1.0ps from 0V to VBR) and low dynamic impedance, enabling effective clamping of sub-microsecond ESD and EFT events. Its unidirectional configuration provides reverse-biased protection only, requiring correct polarity alignment with the protected line's DC bias.

It complies with ANSI/IEEE C62.35 for surge testing and delivers 600W non-repetitive peak pulse power under the standardized 10/1000μs waveform. Junction temperature is rated from –55°C to +175°C, supporting operation in under-hood automotive and industrial environments where ambient temperatures exceed 100°C.

Key Specifications

Pinout & Package

DO-204AC (DO-15) axial package with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002. Polarity is unidirectional: cathode (banded end) connects to the protected line's positive side when used for reverse-bias overvoltage clamping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ170A and 1.5KE170A, the P6KE170 offers optimal balance of 600W surge handling, DO-15 through-hole compatibility, ultra-low leakage, and AEC-Q101 qualification-making it preferred for cost-sensitive, thermally demanding automotive and industrial control applications.

Availability

P6KE170 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O protection, and AC/DC adapter input-stage surge suppression requiring stable component supply and long-term lifecycle support.

Supply support for P6KE170 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, TVS diodes, and rectifiers since 1979.

The P6KE series was developed for high-reliability transient suppression in automotive and industrial power systems, emphasizing AEC-Q101 compliance, tight parametric tolerances, and robust surge endurance in harsh thermal environments.

FAQ

What is the polarity configuration of the P6KE170?

The P6KE170 is a unidirectional TVS diode with cathode marking (band) indicating the terminal to be connected toward the positive side of the protected DC line. During normal operation, it remains reverse-biased; it conducts only when transient voltage exceeds its breakdown range (153–187 V). This configuration prevents forward conduction during steady-state operation and ensures predictable clamping behavior on negative-going transients.

Does the P6KE170 meet AEC-Q101 qualification?

The base P6KE170 is not AEC-Q101 qualified; however, the P6KE170H variant-identical in electrical specs and DO-15 packaging-is explicitly qualified per AEC-Q101 Rev D for automotive applications. Engineers specifying P6KE170 for under-hood use must select the "H" suffix version and verify qualification status via Taiwan Semiconductor's official documentation and lot traceability reports.

How does the P6KE170 compare to bidirectional TVS diodes like P6KE170CA?

The P6KE170 is unidirectional and intended for DC rail protection with defined polarity, whereas P6KE170CA is bidirectional and suited for AC lines or data signals with no fixed DC bias. The P6KE170 offers lower leakage (<1 μA vs. ~5 μA for CA types at same VWM) and tighter VBR tolerance, making it preferable for precision DC power protection where reverse leakage could affect system quiescent current or sensor accuracy.

What is the maximum allowable PCB trace length between P6KE170 and the protected IC?

To maintain effective clamping, PCB trace inductance must be minimized: total loop inductance (anode-to-ground + cathode-to-rail) should remain below 10 nH. For P6KE170, this typically requires traces ≤10 mm in length with direct ground-plane connection and placement within 5 mm of the protected IC's power pin. Longer paths degrade clamping performance by allowing voltage overshoot due to L·di/dt during fast transients.

Can P6KE170 be used in parallel for higher surge current handling?

No-P6KE170 devices should not be paralleled without external balancing resistors, as minor VBR mismatches cause uneven current sharing and potential thermal runaway. For higher IPP, select a single higher-rated device (e.g., 1.5KE170A) or verify matched-bin pairing per Taiwan Semiconductor's application guidance. Parallel use voids AEC-Q101 qualification and compromises reliability in automotive deployments.