Taiwan Semiconductor Corporation P4KE75

Overview

P4KE75 from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a nominal breakdown voltage of 75 V, clamps transients to ≤108 V at 3.8 A peak pulse current, and offers low leakage (<1 µA at 60.7 V), fast response (<1.0 ps), and DO-204AL (DO-41) through-hole packaging - deployed in automotive body control modules, industrial PLC I/O protection, and AC/DC adapter input stages.

For engineers reviewing the P4KE75 datasheet, P4KE75 pinout, P4KE75 application, or P4KE75 equivalent, key selection criteria include its 75 V standoff rating, 108 V clamping performance under 10/1000 µs surge, unidirectional polarity marking, thermal robustness up to 175 °C junction temperature, and AEC-Q101 qualification availability in H-suffix variants.

Technical Context

The P4KE75 operates as a silicon avalanche diode with sharp reverse-breakdown characteristics, triggered when transient voltage exceeds its 67.5–82.5 V breakdown range at 1 mA test current. Its low dynamic impedance ensures effective clamping during fast-rising ESD or lightning-induced surges, while its 10/1000 µs waveform-rated 400 W peak power dissipation enables reliable handling of repetitive or single-event transients without thermal runaway.

Designed for unidirectional operation, the device exhibits forward voltage of 3.5 V at 25 A (per spec note for VBR ≤200 V), supports steady-state power dissipation of 1 W at 75 °C lead temperature, and maintains stable electrical behavior across –55 °C to +175 °C operating junction range - making it suitable for under-hood automotive and high-temperature industrial environments.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, epoxy-molded, RoHS-compliant, UL 94V-0 rated compound, pure tin-plated leads. Cathode indicated by band marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ75A and 1.5KE75A, the P4KE75 provides optimal balance of proven through-hole reliability, precise 75 V unidirectional clamping, and 400 W surge capacity - ideal for cost-sensitive, thermally stable, and serviceable power supply protection where manual assembly or field repair is required.

Availability

P4KE75 is available at Aetrix Electronics and suitable for automotive electronics, industrial PLC I/O modules, and AC/DC power adapter designs requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production batches.

Supply support for P4KE75 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and thyristors - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q101 validation capabilities.

The P4KE series belongs to TSC's high-reliability transient suppression portfolio, engineered specifically for robust overvoltage protection in automotive, industrial, and consumer power systems where consistent clamping performance and thermal resilience are critical.

FAQ

What is the maximum clamping voltage of the P4KE75 under standard surge conditions?

The P4KE75 clamps to a maximum of 108 V when subjected to a 10/1000 µs waveform at its rated peak pulse current of 3.8 A. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage seen by downstream circuitry during transient events - a key parameter for ensuring protected ICs remain within absolute maximum ratings. The P4KE75 achieves this while maintaining tight V_BR tolerance (67.5–82.5 V) and low dynamic impedance.

Is the P4KE75 suitable for automotive applications?

Yes - the P4KE75 is available in AEC-Q101 qualified versions (e.g., P4KE75H), validated for stress tests including temperature cycling, humidity bias, and mechanical shock. Its 175 °C maximum junction temperature, low leakage (<1 µA), and stable clamping performance across –55 °C to +175 °C make it appropriate for under-hood and cabin applications such as body control modules, lighting drivers, and infotainment power inputs - provided the H-suffix variant is specified and sourced.

How does the P4KE75 differ from the P4KE75A variant?

The P4KE75A offers tighter breakdown voltage tolerance: 71.3–78.8 V vs. 67.5–82.5 V for the P4KE75, achieved via enhanced binning. Both share identical package (DO-41), power rating (400 W), clamping voltage (103 V for P4KE75A vs. 108 V for P4KE75), and thermal specs. The P4KE75A is preferred in precision-critical applications where narrower V_BR spread reduces design margin uncertainty - though the standard P4KE75 remains optimal for cost-sensitive, high-volume deployments.

What is the polarity configuration of the P4KE75?

The P4KE75 is a unidirectional TVS diode, with cathode identified by a distinct band marking on the DO-41 package body. In circuit, the cathode connects to the line being protected (e.g., +V rail), and the anode connects to reference ground - enabling conduction only during positive overvoltage events. This configuration avoids forward conduction during normal operation and eliminates reverse leakage concerns present in bidirectional variants.

Can the P4KE75 be used in bidirectional signal line protection?

No - the P4KE75 is strictly unidirectional and unsuitable for bidirectional signal lines (e.g., RS-485, CAN, USB D+/D−) without external circuitry. For such applications, a bidirectional variant like P4KE75CA or surface-mount alternatives (e.g., SMAJ75CA) must be selected. Using the P4KE75 on AC or bipolar signals risks permanent damage due to forward conduction during negative half-cycles, as it lacks symmetrical breakdown characteristics.