Taiwan Semiconductor Corporation P4KE9.1CA

Overview

P4KE9.1CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-204AL (DO-41) package, designed for high-energy ESD and surge protection in power rails and signal lines. It features a nominal breakdown voltage of 9.1 V, 400 W peak pulse power rating at 10/1000 μs waveform, clamping voltage of 13.4 V at 31 A peak pulse current, and operates across –55 °C to +175 °C junction temperature range - used in automotive lighting control modules and industrial sensor interfaces.

For engineers reviewing the P4KE9.1CA datasheet, P4KE9.1CA pinout, P4KE9.1CA application, or P4KE9.1CA equivalent, key selection criteria include bidirectional clamping capability, low leakage (<1 μA at 7.78 V), fast response time (≤5 ns), UL 94V-0 molded case, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

The P4KE9.1CA implements a silicon avalanche diode structure optimized for bidirectional transient suppression. Its symmetrical VBR min/max (8.65–9.55 V at 1 mA) ensures consistent clamping in both polarities, with a maximum clamping voltage of 13.4 V at 31 A IPPM under 10/1000 μs waveform - meeting IEC 61000-4-2 and IEC 61000-4-4 immunity requirements.

Thermal performance is defined by a 175 °C maximum junction temperature and derated steady-state power dissipation (1 W at TL = 75 °C on 5×5 mm copper pads). The device exhibits a VBR temperature coefficient of 0.068 %/°C and junction capacitance <1000 pF at VR = 7.78 V (1 MHz), making it suitable for low-speed data line and DC power rail protection.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, molded epoxy case with UL 94V-0 flammability rating and pure tin-plated leads compliant with J-STD-002 solderability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ9.0CA and 1.5KE9.1CA, the P4KE9.1CA offers optimal balance of AEC-Q101 qualification, 400 W capability, and DO-41 compatibility - making it ideal for cost-sensitive automotive and industrial designs where standardized through-hole assembly and proven reliability are prioritized over ultra-high power or SMT miniaturization.

Availability

P4KE9.1CA is available at Aetrix Electronics and suitable for automotive lighting systems, industrial PLC input protection, smart building sensor nodes, and medical diagnostic equipment requiring stable component supply and long-term lifecycle support.

Supply support for P4KE9.1CA 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 - serving automotive, industrial, and consumer markets since 1979.

The P4KE series is part of TSC's AEC-Q101-qualified transient suppression portfolio, engineered specifically for robust, high-reliability protection in harsh electrical environments including automotive power distribution and industrial control systems.

FAQ

What is the clamping voltage of the P4KE9.1CA under standard surge conditions?

The P4KE9.1CA has a maximum clamping voltage (VC) of 13.4 V at 31 A peak pulse current (IPPM), tested with the industry-standard 10/1000 μs double-exponential waveform. This value ensures downstream components experience no more than 13.4 V during surge events, protecting 16 V-rated ICs and interface circuits. The P4KE9.1CA maintains this clamping performance across its full operating temperature range.

Is the P4KE9.1CA suitable for automotive applications?

Yes, the P4KE9.1CA is AEC-Q101 qualified and explicitly rated for automotive use. It passes high-temperature operating life (HTOL), temperature cycling (TCT), and biased highly accelerated stress testing (BHAST) per AEC-Q101 Rev D. Its –55 °C to +175 °C junction temperature range and DO-41 mechanical robustness make the P4KE9.1CA appropriate for engine control units, body electronics, and lighting modules.

How does the bidirectional configuration of the P4KE9.1CA differ from unidirectional variants like P4KE9.1A?

The P4KE9.1CA is bidirectional, meaning it conducts symmetrically in both directions with identical breakdown (8.65–9.55 V) and clamping characteristics - ideal for AC lines or floating DC rails. In contrast, P4KE9.1A is unidirectional and includes a cathode band marking; it only clamps in reverse bias and conducts forward at ~3.5 V. The P4KE9.1CA eliminates polarity concerns and simplifies layout in differential or AC-coupled protection schemes.

What is the maximum reverse leakage current for the P4KE9.1CA at its working stand-off voltage?

The P4KE9.1CA exhibits a maximum reverse leakage current (ID) of 1 μA at its working stand-off voltage (VWM) of 7.78 V, measured at TA = 25 °C. This low leakage minimizes quiescent power loss in battery-operated systems and prevents false triggering in high-impedance sensing circuits. The P4KE9.1CA maintains leakage below 5 μA even at 85 °C ambient, per TSC characterization data.

Does the P4KE9.1CA require heatsinking for continuous operation?

No, the P4KE9.1CA is not intended for continuous power dissipation; it is rated for non-repetitive transient suppression only. Its steady-state power dissipation is limited to 1 W at lead temperature TL = 75 °C (mounted on 5 × 5 mm copper pads). For typical surge protection use - where pulses occur infrequently - no heatsink is needed. The P4KE9.1CA relies on thermal mass of PCB copper and short-duration energy absorption rather than sustained thermal management.