Taiwan Semiconductor Corporation P4KE82CAH

Overview

P4KE82CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in automotive and industrial power rails. It features a 82 V nominal breakdown voltage, 400 W peak pulse power rating at 10/1000 μs waveform, clamping voltage of 118 V at 3.5 A peak pulse current, and AEC-Q101 qualification for under-hood automotive applications such as engine control units and body electronics.

For engineers reviewing the P4KE82CAH datasheet, P4KE82CAH pinout, P4KE82CAH application, or P4KE82CAH equivalent, key selection criteria include its bidirectional polarity, DO-204AL (DO-41) package compatibility with legacy through-hole layouts, low leakage (<1 μA at 66.4 V), and fast clamping response (<5 ns) critical for ESD and EFT immunity in 12 V/24 V systems.

Technical Context

The P4KE82CAH operates as a voltage-clamped shunt protector, conducting when transient voltages exceed its reverse standoff voltage (VWM = 66.4 V) and clamping to ≤118 V at 3.5 A. Its bidirectional symmetry ensures identical electrical behavior in both polarities, eliminating polarity-dependent layout constraints.

It delivers 400 W surge capability per ANSI/IEEE C62.35 10/1000 μs waveform, with junction temperature rated from –55 °C to +175 °C and thermal derating above 25 °C. The device meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance requirements.

Key Specifications

Pinout & Package

Package: DO-204AL (DO-41), axial-leaded, glass-passivated case with pure tin-plated leads solderable per J-STD-002. Polarity marked by cathode band; bidirectional operation means no functional anode/cathode distinction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P4KE82CAH, SMBJ85CA offers superior power density and modern SMT compatibility but lacks AEC-Q101 validation, while 1.5KE82CA provides greater energy handling at the cost of slower response and less precise clamping-making P4KE82CAH optimal for AEC-compliant 24 V automotive subsystems requiring balanced performance and qualification.

Availability

P4KE82CAH is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and LED lighting drivers requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for P4KE82CAH 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 with global distribution and AEC-Q101 certification capability.

The P4KE series was developed specifically for cost-sensitive, high-reliability automotive and industrial surge protection, emphasizing AEC-Q101 qualification, tight parameter tolerances, and legacy through-hole compatibility for second-sourcing flexibility.

FAQ

What does the "CA" suffix indicate in P4KE82CAH?

The "CA" suffix in P4KE82CAH denotes bidirectional configuration-meaning the device functions identically for both positive and negative transients, with symmetric breakdown and clamping characteristics. This eliminates polarity concerns during PCB placement and simplifies design for AC-coupled or floating signal lines. Unlike unidirectional variants (e.g., P4KE82AH), P4KE82CAH has no designated anode or cathode for functional operation.

Is P4KE82CAH suitable for protecting CAN bus lines?

P4KE82CAH is not recommended for direct CAN bus line protection due to its relatively high clamping voltage (118 V) and lack of low-capacitance optimization-CAN transceivers typically require sub-100 pF devices with clamping below 15 V. However, P4KE82CAH is appropriate for protecting the 12 V/24 V power rails feeding CAN nodes, where its 400 W surge rating and AEC-Q101 qualification ensure robustness against load dump and battery reversal events upstream of the transceiver.

How does the "H" suffix affect P4KE82CAH's specifications?

The "H" suffix in P4KE82CAH confirms full AEC-Q101 qualification, including stress testing for temperature cycling, high-temperature operating life, and mechanical shock. Electrical parameters remain identical to non-H variants (e.g., P4KE82CA), but the "H" version undergoes additional screening and lot-level validation to meet automotive reliability standards-ensuring consistent performance across extended temperature ranges and mission-critical vehicle applications.

What is the maximum steady-state power dissipation for P4KE82CAH?

The maximum steady-state power dissipation for P4KE82CAH is 1 W at lead temperature (TL) of 75 °C, measured with 0.375-inch (9.5 mm) lead lengths mounted on 5 × 5 mm copper pads. This rating applies only to continuous DC or low-frequency conditions-not surge events-and must be thermally derated linearly above 25 °C ambient per Figure 2 in the datasheet to avoid junction overheating beyond 175 °C.

Can P4KE82CAH replace P4KE82A in existing designs?

P4KE82CAH cannot directly replace P4KE82A because P4KE82A is unidirectional (single-polarity), whereas P4KE82CAH is bidirectional-requiring verification of circuit topology. If the original design relies on directional clamping (e.g., only negative transients), substituting P4KE82CAH may allow unintended conduction during normal operation. Always confirm polarity requirements and validate clamping behavior under both polarities before replacement.