ETK81-050 Datasheet, Features, Pinout, and Applications

ETK81-050 Overview

The ETK81-050 is a rugged thyristor module designed for medium-power AC and DC control applications. ETK81-050 balances high surge capability with a compact M102 case, making it suitable for industrial rectifiers, motor controllers, and power conversion equipment.

Engineers choose the ETK81-050 for its combination of 500 V blocking capability and robust thermal performance, which simplifies heatsink design and reduces system-level cost while maintaining reliability under repetitive surge conditions.

ETK81-050 Key Features

• Repetitive peak off-state voltage (VDRM/VRRM): 500 V

• Average on-state current IT(AV): 80 A (TC = 80°C)

• High surge current capability (ITSM): up to 1200 A (10 ms half-sine)

• Low on-state voltage VTM typical < ~1.6 V at rated currents

• Case style: M102 with UL recognition for secure mounting

• Robust terminals and insulating housing for industrial environments

These features let the ETK81-050 operate reliably in controlled rectifier and AC phase-angle control circuits used in industry.

Electrical Characteristics

The datasheet electrical highlights for the ETK81-050 include IT(AV), VDRM/VRRM, ITSM and static VTM. Typical values from the ETK81-050 datasheet are summarized below for quick reference.

The curve above (from the ETK81-050 datasheet) shows VCE(sat) as a function of base/gate drive current for multiple collector currents. Designers should use this graph to determine the required drive current (IG/IB) to achieve acceptable saturation voltage at expected load currents.

Pin Configuration & Gate Triggering

The ETK81-050 module provides three main connections: anode (A), cathode (K) and gate (G). The gate drive requirements are modest, but proper gating ensures reliable turn-on under heavy load.

When integrating ETK81-050, ensure gate resistor and snubber networks are sized to limit dV/dt and prevent false triggering in high-noise environments.

ETK81-050 Applications

The ETK81-050 is optimized for the following application areas:

• AC motor speed control (phase-angle controllers) — ETK81-050 is commonly used where controlled conduction and robust surge handling are required.

• Controlled rectifiers and industrial power supplies — ETK81-050 handles continuous conduction and repetitive surges in bridge rectifier assemblies.

• Welding power supplies and inductive loads — ETK81-050's surge rating suits transient-heavy systems.

• UPS, battery chargers and inverter front-ends where reliable blocking voltage and current handling are critical.

Choosing the ETK81-050 helps simplify thermal design while delivering the required electrical robustness for these applications.

ETK81-050 Mechanical Dimensions

The ETK81-050 thyristor module is packaged in a M102 case style, designed for robust mounting and consistent thermal performance. The outline drawing shows the compact footprint of 53.0 × 36.0 mm, with a maximum height of 29 mm. Terminal spacing and mounting hole diameters are optimized for industrial-grade assemblies, ensuring secure installation and mechanical stability.

This mechanical design supports ease of integration into heatsinks or power boards, while the UL-certified case (UL E82988) guarantees compliance with safety standards. Engineers can rely on the standardized geometry for drop-in replacements and long-term durability in industrial applications

Thermal & Mechanical Performance

Thermal design is critical for ETK81-050. The module's typical junction-to-case thermal resistance (~0.35 K/W) allows efficient heat transfer to the heatsink when mounted with proper torque and thermal interface material.

Use the datasheet's thermal curves and the ETK81-050 junction-temperature limits to size the heatsink for continuous IT(AV) and anticipated ambient conditions.

The outline drawing above shows the ETK81-050 mechanical footprint (Case M102). Key mounting dimensions, hole diameter (Ø5.2 mm), and terminal spacing are indicated — use this drawing to design the PCB or mechanical bracket for ETK81-050 installation.

Mounting and Assembly Notes

• Use the specified mounting torque for the M102 case screws to ensure good thermal contact without damaging the package.

• Apply appropriate thermal compound between the ETK81-050 case and heatsink; ensure flatness and cleanliness for minimal thermal resistance.

• Maintain recommended creepage and clearance distances for 500 V operation when designing the board layout around ETK81-050.

Equivalent Parts & Selection Guidance

If a different blocking voltage or current rating is required, consider ETK-series variants with suitable VDRM or IT(AV) ratings. When replacing ETK81-050, confirm case M102 compatibility, surge ratings, and thermal limits to avoid derating issues.

ETK81-050 Manufacturer

The ETK81-050 thyristor module is manufactured by Fujitsu, a globally recognized Japanese company known for its advanced technology and strict quality standards. Fujitsu has a long history in the development of semiconductor devices for power control, and its modules are widely trusted in applications such as motor drives, welding machines, UPS systems, and renewable energy converters.

With robust design, UL certification, and precise manufacturing, Fujitsu ensures that the ETK81-050 delivers stable electrical performance, excellent thermal management, and long-term reliability. For engineers and procurement managers, sourcing from Fujitsu also means assurance of consistent supply and technical support, making the ETK81-050 a dependable choice in industrial power electronics.

Conclusion

The ETK81-050 is a practical, high-reliability thyristor module for medium-power industrial applications. Its 500 V blocking rating, 80 A average current capability, and robust M102 packaging make ETK81-050 an excellent choice for controlled rectification, motor control, and surge-prone power systems.