Vishay General Semiconductor - Diodes Division P4KE33C-E3/54

Overview

P4KE33C-E3/54 from Vishay General Semiconductor is a bidirectional Transient Voltage Suppressor (TVS) diode in DO-41 package, designed for clamping voltage transients on signal or power lines. It features 33 V breakdown voltage (V_BR min/max = 31.4–34.7 V at 1.0 mA), 28.2 V stand-off voltage (V_WM), 45.7 V maximum clamping voltage (V_C) at 8.8 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform.

For engineers reviewing the P4KE33C-E3/54 datasheet, P4KE33C-E3/54 pinout, P4KE33C-E3/54 application, or P4KE33C-E3/54 equivalent, key selection criteria include bidirectional clamping capability, DO-41 through-hole compatibility, AEC-Q101 qualification (via HE3 suffix variant), low leakage (<1.0 μA at V_WM), and thermal resistance (R_θJL = 66 °C/W) for robust surge protection in automotive and industrial environments.

Technical Context

The P4KE33C-E3/54 implements a glass-passivated silicon junction optimized for fast transient response (<1 ns) and low incremental surge resistance. Its bidirectional architecture enables symmetrical clamping in AC-coupled or floating signal paths without polarity sensitivity - critical for protecting differential interfaces like RS-485 or CAN bus lines.

It operates across -55 °C to +175 °C junction temperature range, supports 1.5 W steady-state power dissipation on infinite heatsink at T_L = 75 °C, and maintains stable V_BR temperature coefficient of 0.098 %/°C - enabling predictable performance under thermal stress in engine control units or motor drives.

Key Specifications

Pinout & Package

DO-41 (DO-204AL) molded epoxy package with matte tin-plated leads; compliant with J-STD-002 and JESD 22-B102 solderability standards. No polarity marking - bidirectional operation confirmed by 'C' suffix.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ33CA and 1.5KE33CA, the P4KE33C-E3/54 offers optimal balance of DO-41 through-hole manufacturability, 400 W surge capability, and tight 45.7 V clamping - making it preferred for cost-sensitive automotive and industrial designs where layout stability and thermal derating predictability are critical.

Availability

P4KE33C-E3/54 is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor interface protection, and telecom line surge suppression requiring stable component supply and RoHS-compliant sourcing.

Supply support for P4KE33C-E3/54 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

Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability and AEC-Q qualification.

The P4KE33C-E3/54 belongs to the TRANSZORB® family of transient voltage suppressors, engineered specifically for robust, standardized surge immunity in automotive, industrial, and telecom infrastructure applications.

FAQ

What does the 'C' suffix indicate in P4KE33C-E3/54?

The 'C' suffix in P4KE33C-E3/54 denotes bidirectional configuration - meaning the device provides symmetrical clamping in both polarities without cathode/anode orientation constraints. This differs from unidirectional variants (e.g., P4KE33A-E3/54) that require correct polarity placement. The P4KE33C-E3/54 is therefore ideal for AC-coupled or floating signal lines where voltage polarity may reverse, such as RS-485 buses or transformer-isolated power rails.

Is P4KE33C-E3/54 AEC-Q101 qualified?

The P4KE33C-E3/54 itself carries the commercial-grade E3 suffix and is RoHS-compliant but not AEC-Q101 qualified. However, the functionally identical P4KE33CHE3/54 variant - distinguished by the 'HE3' suffix - is fully AEC-Q101 qualified and shares identical electrical characteristics, DO-41 packaging, and thermal performance. Engineers requiring automotive qualification should specify P4KE33CHE3/54 instead of P4KE33C-E3/54.

What is the maximum clamping voltage of P4KE33C-E3/54 and at what current?

The maximum clamping voltage (V_C) of P4KE33C-E3/54 is 45.7 V, measured at its rated peak pulse current (I_PPM) of 8.8 A using the standard 10/1000 μs double-exponential waveform. This value is guaranteed per Vishay's datasheet (Document Number 88365, Rev. 16-Sep-2021) and represents the upper limit of voltage seen by protected circuitry during worst-case transient events - critical for ensuring compatibility with downstream ICs rated for ≤48 V absolute maximum.

Can P4KE33C-E3/54 be used in place of P4KE33A-E3/54?

No - P4KE33C-E3/54 and P4KE33A-E3/54 are not interchangeable without circuit review. The 'C' suffix indicates bidirectional operation, while 'A' denotes unidirectional. Substituting P4KE33C-E3/54 for P4KE33A-E3/54 introduces reverse conduction capability that may disrupt DC biasing in unidirectional applications (e.g., DC power rail protection). Conversely, replacing P4KE33C-E3/54 with P4KE33A-E3/54 removes symmetrical clamping, risking failure on negative-going transients. Always verify polarity requirements before substitution.

What is the thermal resistance and how does it affect P4KE33C-E3/54 layout?

The P4KE33C-E3/54 has a typical junction-to-lead thermal resistance (R_θJL) of 66 °C/W, measured with lead length L = 10 mm. This parameter directly governs temperature rise under sustained power dissipation: for example, at 1.0 W steady-state dissipation, junction temperature rises ~66 °C above lead temperature. Layout must ensure adequate copper area on both leads for heat spreading, especially in high-ambient environments like automotive under-hood applications. Derating curves (Fig. 2 and Fig. 5 in datasheet 88365) confirm usable power drops to ~0.75 W at T_L = 100 °C.