Taiwan Semiconductor Corporation P4KE22

Overview

P4KE22 from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode designed for primary overvoltage protection at DC power rails and signal lines. It features a nominal breakdown voltage of 22 V, clamping voltage of 31.9 V at 13.0 A peak pulse current, and working stand-off voltage of 17.8 V - enabling robust ESD and lightning surge suppression in automotive and industrial control inputs.

For engineers reviewing the P4KE22 datasheet, P4KE22 pinout, P4KE22 application, or P4KE22 equivalent, key selection criteria include its DO-204AL (DO-41) axial package, <1.0 ps response time from 0 V to V_BR, <1 μA reverse leakage above 10 V, and AEC-Q101 qualification option (P4KE22H), making it suitable for high-reliability 12–24 V system interfaces.

Technical Context

The P4KE22 operates as a silicon avalanche diode with unidirectional polarity, triggered when transient voltage exceeds its 19.8–24.2 V breakdown range at 1 mA test current. Its low dynamic impedance ensures rapid clamping during 10/1000 μs surges up to 400 W, limiting downstream circuit voltage to ≤31.9 V under 13.0 A peak pulse current.

Thermal design relies on its 175 °C maximum junction temperature and 1 W steady-state power dissipation at 75 °C lead temperature. The device exhibits a +0.092 %/°C V_BR temperature coefficient and meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance standards.

Key Specifications

Pinout & Package

DO-204AL (DO-41) axial package with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD201 Class 2 whisker resistance. Polarity is unidirectional: banded end is cathode.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMAJ22A and 1.5KE22A, the P4KE22 offers axial DO-41 mounting, tighter 31.9 V clamping, and direct compatibility with legacy through-hole designs - making it optimal for cost-sensitive, serviceable, or mixed-technology assemblies requiring AEC-Q101 readiness.

Availability

P4KE22 is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor interface protection, LED driver supply rail protection, and RS-485 transceiver port protection requiring stable component supply and long-term lifecycle support.

Supply support for P4KE22 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 for industrial, automotive, and consumer applications.

The P4KE series was developed to deliver high-surge-capability, AEC-Q101-ready TVS diodes in standardized axial packages - targeting cost-effective, high-volume protection for 12–440 V DC systems where reliability and regulatory compliance are critical.

FAQ

What is the clamping voltage of the P4KE22 under maximum rated surge conditions?

The P4KE22 clamps to a maximum of 31.9 V when subjected to its rated 13.0 A peak pulse current (10/1000 μs waveform). This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage seen by downstream circuitry during a full 400 W transient event. The P4KE22 maintains this clamping performance across its specified operating junction temperature range of –55 °C to +175 °C.

Is the P4KE22 unidirectional or bidirectional, and how is polarity identified?

The standard P4KE22 is a unidirectional TVS diode, with polarity indicated by a cathode band on the DO-204AL (DO-41) package - the banded end is the cathode and must be connected toward ground or the lower-potential node. Bidirectional variants exist in the P4KE series (e.g., P4KE22CA) but require explicit "CA" suffix; the base P4KE22 part number denotes unidirectional configuration.

Does the P4KE22 meet automotive qualification standards?

The base P4KE22 is not AEC-Q101 qualified; however, the P4KE22H variant - identifiable by the "H" suffix in the ordering code - is fully AEC-Q101 qualified and tested for automotive applications including high-temperature operating life, temperature cycling, and ESD robustness. Both share identical electrical parameters, with qualification being the sole differentiator.

What is the maximum steady-state power dissipation for the P4KE22 at elevated temperatures?

The P4KE22 has a steady-state power dissipation (P_D) of 1 W at a lead temperature (T_L) of 75 °C, with linear derating above that point per the manufacturer's derating curve (Fig.2). At 125 °C lead temperature, P_D drops to approximately 0.5 W. This rating assumes 9.5 mm lead length and 5 × 5 mm copper pads per terminal - critical for thermal design in high-ambient environments.

How does the P4KE22 compare to the P4KE22A in terms of electrical performance?

The P4KE22A offers tighter breakdown voltage tolerance (20.9–23.1 V vs. 19.8–24.2 V for P4KE22) and slightly lower clamping voltage (30.6 V vs. 31.9 V at 13.7 A), due to its ±5% V_BR spec versus ±10% for the standard version. Both share identical package, surge rating, and thermal limits; the "A" suffix indicates enhanced parameter consistency for precision-critical applications.