Taiwan Semiconductor Corporation P4KE47

Overview

P4KE47 from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a nominal breakdown voltage of 47 V, clamps transients to ≤67.8 V at 6.2 A peak pulse current, and delivers fast response (<1.0 ps from 0 V to V_BR), with <1 μA reverse leakage at 38.1 V working stand-off voltage - deployed in automotive lighting control modules and industrial sensor interfaces.

For engineers reviewing the P4KE47 datasheet, P4KE47 pinout, P4KE47 application, or P4KE47 equivalent, key selection criteria include its DO-204AL (DO-41) axial package, unidirectional polarity marking, 175 °C maximum junction temperature, and compliance with AEC-Q101 for automotive-grade reliability - all critical for ESD and EFT immunity design in harsh environments.

Technical Context

The P4KE47 operates as a silicon avalanche diode with precise Zener-like breakdown behavior under transient overvoltage conditions. Its clamping action begins at a minimum breakdown voltage of 42.3 V (tested at 1 mA) and sustains up to 51.7 V maximum, enabling robust margin against line surges while maintaining low impedance during conduction.

It meets ANSI/IEEE C62.35 standards for 10/1000 μs waveform surge testing and exhibits a temperature coefficient of 0.101 %/°C for V_BR, ensuring predictable voltage drift across its –55 °C to +175 °C operating junction range - essential for thermal stability in engine bay or industrial control applications.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, cathode-banded end marking for unidirectional polarity. Leads are pure tin-plated and solderable per J-STD-002; weight ≈ 0.300 g.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ47A and 1.5KE47A, the P4KE47 offers optimal balance of compact axial packaging, precise 47 V clamping, and 400 W capability - making it ideal for cost-sensitive, high-reliability DC rail protection where through-hole assembly and AEC-Q101 qualification are priorities.

Availability

P4KE47 is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interface, DC power rail protection, and ESD-sensitive communication port applications requiring stable component supply and long-term sourcing continuity.

Supply support for P4KE47 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 - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q101 qualified production lines.

The P4KE series was developed to deliver standardized, high-reliability transient protection for automotive and industrial power systems - emphasizing robust surge handling, tight voltage tolerances, and extended temperature operation in cost-effective axial packages.

FAQ

What is the maximum clamping voltage of the P4KE47 under standard test conditions?

The P4KE47 has a maximum clamping voltage (V_C) of 67.8 V when subjected to a 10/1000 μs surge waveform at 6.2 A peak pulse current. This value is measured per ANSI/IEEE C62.35 and ensures downstream components rated up to 50 V remain within safe operating limits during transient events. The P4KE47 maintains this clamping performance across its full operating temperature range.

Is the P4KE47 unidirectional or bidirectional, and how is polarity indicated?

The P4KE47 is a unidirectional TVS diode, with cathode identified by a distinct band on the DO-204AL (DO-41) package body. This polarity must be observed during PCB layout: cathode connects to the protected line (e.g., 24 V rail), anode to ground. Bidirectional variants use "CA" suffixes (e.g., P4KE47CA), which are electrically distinct and not interchangeable with the P4KE47.

Does the P4KE47 meet automotive qualification standards?

The base P4KE47 is not AEC-Q101 qualified; however, the P4KE47H variant - explicitly designated with "H" suffix - undergoes full AEC-Q101 stress testing including HTGB, H3TRB, and temperature cycling. For automotive applications requiring formal qualification, specify P4KE47H; the P4KE47 remains suitable for industrial and commercial designs where AEC-Q101 is not mandated.

What is the reverse leakage current specification for the P4KE47 at its working stand-off voltage?

The P4KE47 exhibits a maximum reverse leakage current (I_D) of 1 μA when biased at its working stand-off voltage of 38.1 V. This low leakage minimizes quiescent power draw and prevents unintended biasing of upstream regulators or sensing circuits - critical in battery-powered or precision analog systems where standby current must be tightly controlled. The P4KE47 achieves this while maintaining fast response and high surge capability.

Can the P4KE47 be used in place of the P4KE47A, and what is the key difference?

No, the P4KE47 and P4KE47A are not interchangeable without circuit review. The P4KE47A has tighter breakdown voltage tolerance (44.7–49.4 V vs. 42.3–51.7 V for P4KE47) and slightly higher V_WM (40.2 V vs. 38.1 V). This results in lower leakage and improved noise immunity but reduced margin for voltage drift. Substituting P4KE47A for P4KE47 may cause premature conduction in high-temperature environments unless system tolerances accommodate the narrower V_BR window.