Taiwan Semiconductor Corporation P4KE82

Overview

P4KE82 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 82 V, a working stand-off voltage of 66.4 V, clamps transients to ≤118 V at 3.5 A peak pulse current, and delivers sub-nanosecond response for ESD and EFT immunity in automotive body electronics.

For engineers reviewing the P4KE82 datasheet, P4KE82 pinout, P4KE82 application, or P4KE82 equivalent, this device is selected for robust surge suppression in 24 V/48 V industrial control inputs, automotive lighting drivers, and I/O interface protection where low leakage (<1 µA @ 66.4 V), high surge rating (400 W @ 10/1000 µs), and DO-41 package compatibility are critical.

Technical Context

The P4KE82 operates as a silicon avalanche diode with unidirectional polarity, activated only during positive-going transients relative to its cathode marking. Its clamping behavior follows IEEE C62.35-defined 10/1000 µs waveform standards, with junction temperature rated from –55 °C to +175 °C and thermal derating applied above 25 °C ambient.

It exhibits a typical temperature coefficient of 0.105 %/°C for V_BR, enabling predictable voltage drift across operating range, and maintains <1 µA reverse leakage at V_WM, ensuring minimal standby power loss in always-on circuits such as CAN bus termination or sensor supply rails.

Key Specifications

Pinout & Package

DO-204AL (DO-41) package with axial leads: Cathode indicated by band-marked end; anode is unmarked lead. Designed for PCB mounting with 5 × 5 mm copper pads per terminal for optimal thermal dissipation at rated power.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Littelfuse SMAJ8.0A and ON Semi 1.5KE82A, the P4KE82 offers superior clamping voltage (118 V), axial DO-41 compatibility for through-hole production, and AEC-Q101 qualification path-making it optimal for new automotive and industrial designs prioritizing robustness and manufacturability.

Availability

P4KE82 is available at Aetrix Electronics and suitable for automotive lighting systems, industrial PLC input stages, DC power supply rails, and body control module I/O protection requiring stable component supply and long-term lifecycle support.

Supply support for P4KE82 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 MOSFETs for automotive, industrial, and consumer markets.

The P4KE series was developed for high-reliability transient suppression in harsh environments, emphasizing AEC-Q101 qualification, tight parametric consistency, and robust surge handling in axial-package form factors.

FAQ

What is the maximum clamping voltage of the P4KE82 under standard surge conditions?

The P4KE82 clamps to a maximum of 118 V when subjected to a 3.5 A peak pulse current with a 10/1000 µs waveform, as specified in the Taiwan Semiconductor datasheet. This value represents the upper limit of voltage imposed on protected circuitry during a standardized surge event and is measured at T_A = 25 °C. The P4KE82 maintains this clamping performance across its full operating temperature range, making it suitable for use in thermally demanding applications.

Is the P4KE82 unidirectional or bidirectional, and how is polarity identified?

The P4KE82 is a unidirectional TVS diode, meaning it conducts only during positive voltage transients applied to its cathode relative to anode. Polarity is marked by a distinct cathode band on the DO-41 package body-this banded end must be connected toward the protected line, while the unmarked anode lead connects to ground. Bidirectional variants in the same family carry a "C" or "CA" suffix (e.g., P4KE82CA), which the P4KE82 does not have.

Can the P4KE82 be used in automotive applications requiring AEC-Q101 qualification?

Yes-the P4KE82H variant is explicitly qualified to AEC-Q101 for automotive use, while the base P4KE82 is not. The "H" suffix denotes qualification, including stress testing for temperature cycling, humidity bias, and mechanical shock. For under-hood or body-control applications requiring formal automotive qualification, designers must specify P4KE82H; the standard P4KE82 remains suitable for industrial and commercial systems where AEC-Q101 is not mandated.

What is the reverse leakage current specification for the P4KE82 at its working voltage?

The P4KE82 exhibits a maximum reverse leakage current (I_R) of 1 µA when biased at its working stand-off voltage (V_WM) of 66.4 V, measured at T_A = 25 °C. This ultra-low leakage ensures minimal power loss in always-on circuits such as sensor bias rails or LIN bus terminations. Leakage remains well below 10 µA even at elevated temperatures up to 125 °C, supporting reliable operation in thermally stressed environments.

How does the P4KE82 compare to the 1.5KE82A in terms of package and electrical performance?

The P4KE82 and 1.5KE82A share identical DO-204AL (DO-41) packaging and pinout, enabling direct physical replacement in through-hole layouts. Electrically, both specify V_WM = 66.4 V and V_BR = 73.8–90.2 V, but the P4KE82 achieves a lower clamping voltage (118 V vs. 121 V at rated I_PPM) and higher peak pulse current (3.5 A vs. 3.3 A). These differences give the P4KE82 a tighter voltage margin for protecting 100 V-rated components, making it preferable for new designs demanding enhanced surge resilience.