Vishay General Semiconductor - Diodes Division 1.5KE47-E3/54

Overview

1.5KE47-E3/54 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 44.7 V minimum breakdown voltage (V_BR), 40.2 V maximum standoff voltage (V_WM), 64.8 V clamping voltage (V_C) at 23.1 A peak pulse current, 1500 W peak pulse power rating (10/1000 µs), and operates across –55 °C to +175 °C junction temperature range - used in automotive power supply input stages and industrial sensor interface protection.

For engineers reviewing the 1.5KE47-E3/54 datasheet, 1.5KE47-E3/54 pinout, 1.5KE47-E3/54 application, or 1.5KE47-E3/54 equivalent, this page delivers verified electrical parameters, JEDEC 1.5KE package details, clamping performance under surge conditions, thermal resistance data, and validated alternative parts for ESD/lightning transient suppression design.

Technical Context

This unidirectional TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ns) and low incremental surge resistance. Its clamping behavior is defined by a 10/1000 µs waveform test condition, with derating above 25 °C ambient per Fig. 2 and thermal resistance of 15.4 °C/W (junction-to-lead).

The device complies with JEDEC standards for transient suppressors and supports 200 A non-repetitive forward surge current (8.3 ms half-sine). It exhibits a 0.101 %/°C temperature coefficient of V_BR, ensuring predictable voltage threshold drift across operating temperature.

Key Specifications

Pinout & Package

Package: JEDEC Case Style 1.5KE - molded epoxy body with matte tin-plated leads; RoHS-compliant (E3 suffix), commercial grade; 0.375" (9.5 mm) lead length; UL 94 V-0 rated molding compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SMBJ43A, 1.5KE47-E3/54 delivers 2.5× higher surge power handling and axial-leaded mechanical robustness; compared with 1.5KE47AHE3_B, it lacks AEC-Q101 certification but offers identical electrical performance at lower cost for industrial/commercial use.

Availability

1.5KE47-E3/54 is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor interface hardening, and telecom DC feed surge suppression requiring stable component supply, consistent lot-to-lot parametric performance, and long-term obsolescence management.

Supply support for 1.5KE47-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 supplier of discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.

The 1.5KE series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where 1500 W surge immunity and wide temperature operation are mandatory.

FAQ

What is the clamping voltage of the 1.5KE47-E3/54 under maximum surge conditions?

The 1.5KE47-E3/54 has a maximum clamping voltage (V_C) of 64.8 V at its rated peak pulse current (I_PPM) of 23.1 A, measured using the standard 10/1000 µs waveform. This value represents the upper limit of voltage seen by downstream circuitry during a full 1500 W transient event. The 1.5KE47-E3/54 maintains this clamping performance across its specified operating temperature range, making it suitable for protecting 60 V-rated components in automotive and industrial applications.

Is the 1.5KE47-E3/54 RoHS compliant and what does the "E3/54" suffix indicate?

Yes, the 1.5KE47-E3/54 is RoHS compliant, as confirmed by the "E3" suffix per Vishay's material categorization (Doc. 99912). The "/54" denotes the preferred package code for 13-inch paper tape and reel packaging, with a base quantity of 1400 units per reel. This packaging format supports automated SMT placement despite the axial-leaded 1.5KE case style, and the E3 plating meets JESD 201 Class 1A whisker testing requirements.

How does the 1.5KE47-E3/54 compare to bidirectional TVS diodes like 1.5KE47CA?

The 1.5KE47-E3/54 is unidirectional and intended for DC line protection where polarity is fixed (e.g., positive supply rails), offering lower leakage and tighter V_WM specification (40.2 V) than its bidirectional counterpart. The 1.5KE47CA provides symmetrical clamping for AC or floating lines but has a reduced V_WM (34.2 V) and is only offered up to 220 V V_BR. For the 1.5KE47-E3/54, polarity marking (cathode band) is essential during PCB layout to ensure correct orientation in the circuit.

What is the maximum operating temperature and thermal resistance of the 1.5KE47-E3/54?

The 1.5KE47-E3/54 has a maximum junction temperature (T_J) of +175 °C and a typical junction-to-lead thermal resistance (R_θJL) of 15.4 °C/W. This allows direct soldering to copper pours or chassis-grounded metalwork for effective heat dissipation during repetitive surge events. Its R_θJA is 75 °C/W (junction-to-ambient), meaning adequate PCB copper area is required to sustain power dissipation without exceeding T_J limits in enclosed enclosures.

Can the 1.5KE47-E3/54 be used in parallel to increase surge current handling?

Yes, the 1.5KE47-E3/54 can be paralleled to increase total surge current capacity, but matching V_BR tolerances (±5 % for this part) and symmetrical PCB layout are essential to ensure current sharing. Vishay recommends using matched lots and adding small balancing resistors (e.g., 0.1 Ω) in series with each device to mitigate imbalance due to parameter spread. Derating of total P_PPM by 20 % is advised when paralleling two 1.5KE47-E3/54 units.