Taiwan Semiconductor Corporation P4KE12C

Overview

P4KE12C from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 12 V nominal breakdown voltage, 9.72 V working stand-off voltage, 17.3 V maximum clamping voltage at 24 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive body control modules to safeguard CAN transceivers against load dump and EFT events.

For engineers reviewing the P4KE12C datasheet, P4KE12C pinout, P4KE12C application, or P4KE12C equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, leakage current below 1 µA at 9.72 V, DO-41 package compatibility with manual and automated assembly, and AEC-Q101 qualification status for automotive-grade reliability validation.

Technical Context

The P4KE12C operates as a silicon avalanche diode with fast response time (<1.0 ps from 0 V to V_BR) and low dynamic impedance, enabling effective suppression of fast-rising transients such as ISO 7637-2 Pulse 1 and Pulse 2b. Its unidirectional polarity ensures forward conduction only during reverse overvoltage events, with VF = 3.5 V at 25 A for devices with V_BR ≤ 200 V.

Thermal performance is defined by a 175 °C maximum junction temperature and derated power dissipation above 25 °C ambient, supported by DO-41 package thermal resistance characteristics. The device meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance requirements, confirming suitability for high-reliability industrial and automotive PCB environments.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial leaded, epoxy-molded case with cathode band 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 Littelfuse SMAJ12A and Vishay 1.5KE12A, the P4KE12C offers optimal balance of through-hole DO-41 compatibility, 400 W capability, and tight 17.3 V clamping - making it ideal for cost-sensitive, space-constrained automotive and industrial DC rail protection where precise voltage margin is critical.

Availability

P4KE12C is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC digital inputs, LED driver power supplies, and smart meter communication ports requiring stable component supply and AEC-Q101-qualified alternatives.

Supply support for P4KE12C 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, serving global automotive, industrial, and consumer markets since 1979.

The P4KE series belongs to TSC's transient voltage suppressor product line, engineered specifically for robust, cost-effective overvoltage protection in harsh-environment DC power and signal interfaces - emphasizing AEC-Q101 qualification, tight parameter tolerances, and high-volume manufacturability.

FAQ

What is the clamping voltage of P4KE12C at its rated peak pulse current?

The P4KE12C has a maximum clamping voltage (V_C) of 17.3 V when subjected to its rated peak pulse current of 24 A under the standard 10/1000 µs waveform. This value is guaranteed per the manufacturer's datasheet and defines the upper voltage limit imposed on the protected circuit during transient events - critical for ensuring compatibility with downstream ICs rated for ≤20 V absolute maximum voltage.

Is P4KE12C unidirectional or bidirectional, and how is polarity identified?

P4KE12C is a unidirectional TVS diode, indicated by the "C" suffix per Taiwan Semiconductor's ordering nomenclature. Polarity is marked by a cathode band on the DO-41 package body; the banded end connects to the protected line (cathode), while the unbanded end connects to ground (anode). Bidirectional variants use the "CA" suffix (e.g., P4KE12CA).

Does P4KE12C meet automotive qualification standards?

The base P4KE12C is not AEC-Q101 qualified; however, the P4KE12CH variant - identical in electrical and mechanical specifications but manufactured under automotive-grade process controls and subjected to full AEC-Q101 stress testing - is available. Engineers requiring automotive qualification must specify the "H" suffix to ensure compliance with temperature cycling, HTRB, and ESD requirements.

What is the maximum steady-state power dissipation for P4KE12C?

The P4KE12C has a steady-state power dissipation (P_D) of 1 W at lead temperature (T_L) = 75 °C, measured with 9.5 mm (0.375") lead lengths mounted on 5 × 5 mm copper pads. This rating applies only to continuous DC or low-frequency conditions - transient suppression relies on the 400 W peak pulse rating, not steady-state limits.

How does P4KE12C compare to P4KE12A in terms of breakdown voltage tolerance?

P4KE12C has a breakdown voltage (V_BR) range of 10.8–13.2 V at 1 mA test current, corresponding to ±10% tolerance around the 12 V nominal value. In contrast, P4KE12A offers tighter ±5% tolerance (11.4–12.6 V). The "C" suffix denotes the wider tolerance grade; "A" indicates the tighter-tolerance variant - both share identical package, clamping, and surge ratings.