S1U50700A

Overview

The S1U50700A is a silicon controlled rectifier (SCR) manufactured by Diodes Incorporated, designed for reverse blocking applications. It features a sensitive gate architecture allowing triggering by microcontrollers and logic circuits. The device provides a peak repetitive off-state voltage of 700 V and an on-state RMS current rating of 1.0 A at a case temperature of 80°C. It supports a peak non-repetitive surge current of 10 A and offers high dv/dt immunity with a minimum rating of 20 V/µs at 110°C. Packaged in a TO-92 plastic housing, the component operates within a junction temperature range of -40°C to +110°C.

Feature Summary

• Sensitive gate design enables direct triggering from microcontrollers and standard logic circuits
• High surge current capability rated at 10 Amperes for robust transient handling
• Glass-passivated surface construction ensures reliability and uniformity under stress

Applications

• General purpose switching circuits requiring logic-level gate control
• AC power control systems utilizing SCR topology
• Circuits demanding high dv/dt immunity at elevated temperatures

Procurement Notes

This specific part number is officially marked as obsolete and discontinued by the manufacturer. Verification of availability requires contacting Diodes Incorporated directly or consulting authorized distributors for potential surplus stock. Designers must confirm end-of-life status before initiating procurement processes to avoid supply chain disruptions.

Selection Notes

Engineers should evaluate the 700 V blocking voltage and 1.0 A RMS current limits against circuit requirements. The TO-92 package imposes thermal constraints; ensure adequate heat sinking if operating near the 80°C case temperature limit. Verify that the sensitive gate characteristics align with the driving logic levels available in the system design.

Part Context

The S1U50700A belongs to the S1U series of reverse blocking thyristors produced by Diodes Incorporated. This series focuses on providing reliable switching solutions with glass-passivated protection. The component utilizes a TO-92 mechanical package, distinguishing it from higher-power surface-mount alternatives in the broader product portfolio.

Replacement Considerations

As the S1U50700A is discontinued, engineers must identify alternative SCRs with matching 700 V ratings and compatible TO-92 packages. Substitutes should be evaluated for similar gate trigger currents and holding current specifications to ensure functional equivalence in existing designs.

FAQ

What is the maximum dv/dt immunity rating for this device?

The device guarantees a minimum critical rate of rise of off-state voltage (dv/dt) of 20 V/µs at a junction temperature of 110°C.

How does the sensitive gate feature benefit circuit design?

The sensitive gate allows the SCR to be triggered by low-power signals from microcontrollers and other logic circuits without requiring complex driver stages.

What is the thermal resistance from junction to ambient?

The thermal resistance from junction to ambient (RthJA) is specified as 150 °C/W.