Vishay General Semiconductor - Diodes Division P6KE39C-E3/54

Overview

P6KE39C-E3/54 from Vishay General Semiconductor is a bi-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for clamping voltage transients on signal or power lines. It features 39 V breakdown voltage (V_BR min/max = 37.1–41.0 V at 1.0 mA), 33.3 V stand-off voltage (V_WM), 53.9 V maximum clamping voltage (V_C) at 11.1 A peak pulse current (I_PPM), and 600 W peak pulse power (10/1000 µs waveform). It protects MOSFETs, ICs, and sensor signal lines in automotive and industrial power supply interfaces.

For engineers reviewing the P6KE39C-E3/54 datasheet, P6KE39C-E3/54 pinout, P6KE39C-E3/54 application, or P6KE39C-E3/54 equivalent, key selection criteria include bi-directional clamping capability, UL 94 V-0 molded epoxy package, AEC-Q101 qualification (HE3 variant), thermal resistance (R_θJL = 20 °C/W), and low leakage (<1.0 µA at V_WM).

Technical Context

P6KE39C-E3/54 operates as a bi-directional avalanche diode with symmetrical clamping in both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and fast response time (<1 ns), while the DO-204AC package supports manual or automated through-hole assembly with matte tin-plated leads compliant to J-STD-002.

The device is rated for 600 W peak pulse power under 10/1000 µs waveform at T_A = 25 °C, derating linearly above 25 °C per Fig. 2, and withstands 100 A non-repetitive forward surge (8.3 ms half-sine) in uni-directional mode - though P6KE39C is bi-directional and thus not rated for I_FSM. Its temperature coefficient of V_BR is +0.100 %/°C, ensuring predictable voltage drift over operating range.

Key Specifications

Pinout & Package

DO-204AC (DO-15) package: axial-leaded, molded epoxy body, no polarity marking (bi-directional); leads are matte tin-plated, solderable per J-STD-002, rated for 275 °C dip soldering (10 s max).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ36CA and 1.5KE39C, P6KE39C-E3/54 offers optimal balance of cost, through-hole manufacturability, and certified AEC-Q101 compliance (via HE3 variant), making it ideal for mid-volume automotive and industrial control boards where qualification traceability and serviceability matter.

Availability

P6KE39C-E3/54 is available at Aetrix Electronics and suitable for automotive power line protection, industrial sensor signal conditioning, consumer USB port surge suppression, and telecom DSL line interface protection requiring stable component supply and RoHS-compliant sourcing.

Supply support for P6KE39C-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, and protection devices with emphasis on reliability, efficiency, and qualification rigor.

The P6KE series was engineered for cost-sensitive, high-surge industrial and automotive applications where bi-directional clamping, UL certification, and AEC-Q101 validation are mandatory - not merely desirable.

FAQ

What does the "C" suffix indicate in P6KE39C-E3/54?

The "C" in P6KE39C-E3/54 denotes bi-directional configuration - meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike uni-directional variants (e.g., P6KE39A), P6KE39C has no polarity marking and functions identically regardless of terminal orientation in the circuit. This makes P6KE39C-E3/54 ideal for AC-coupled or floating signal lines where polarity cannot be guaranteed.

Is P6KE39C-E3/54 AEC-Q101 qualified?

P6KE39C-E3/54 itself is the commercial-grade version (E3 suffix); however, the HE3 variant (P6KE39CHE3/54) is explicitly AEC-Q101 qualified per the Vishay datasheet revision 18-Sep-12. The E3/54 part shares identical electrical and mechanical specifications but lacks the extended reliability test documentation required for automotive qualification. For AEC-Q101 compliance, specify P6KE39CHE3/54 - not P6KE39C-E3/54.

What is the maximum clamping voltage of P6KE39C-E3/54 under surge conditions?

The maximum clamping voltage (V_C) of P6KE39C-E3/54 is 53.9 V, measured at 11.1 A peak pulse current using the standard 10/1000 µs waveform. This value represents the highest voltage the protected circuit will experience during a worst-case transient event. Engineers must ensure downstream components (e.g., regulators, microcontrollers) have sufficient voltage margin above 53.9 V to avoid damage or latch-up.

Can P6KE39C-E3/54 replace P6KE39A in a design?

No - P6KE39C-E3/54 and P6KE39A are not functionally interchangeable without circuit review. P6KE39A is uni-directional (cathode-banded), with forward conduction behavior and different leakage characteristics; P6KE39C-E3/54 is bi-directional and blocks in both directions until breakdown. Substituting P6KE39C-E3/54 for P6KE39A may cause unintended conduction in DC-biased rails. Always verify polarity requirements and clamping symmetry before replacement.

What is the thermal resistance of P6KE39C-E3/54, and how does it affect layout?

P6KE39C-E3/54 has a typical junction-to-lead thermal resistance (R_θJL) of 20 °C/W and junction-to-ambient (R_θJA) of 75 °C/W. Because it relies on lead conduction for heat dissipation, PCB layout must provide adequate copper area on both leads - minimum 0.5"² per lead recommended - especially in high-duty-cycle surge environments. Without sufficient copper, junction temperature can exceed 175 °C during repetitive transients, accelerating degradation of the P6KE39C-E3/54.