## Summary of the AT708S08 Thyristor/SCR Datasheet

This document details the specifications for the AT708S08, a high-power thyristor (also known as an SCR - Silicon Controlled Rectifier). Here's a breakdown of the key information:

Core Characteristics:

️· Voltage: Designed for applications up to 800V (VDRM, VDSM)
️· Current: Capable of handling average currents up to 4925A (IT(AV)) and surge currents up to 70kA (ITSM).
️· Application: Suitable for high-power control applications like industrial rectifiers, inverters, choppers, and AC voltage control.

Key Parameters:

️· Blocking Voltage (VDRM/VDSM): 800V – The maximum voltage the SCR can withstand in the off-state.
️· On-State Voltage (VT): ~1.5V at 10kA – The voltage drop across the SCR when conducting.
️· Holding Current (IH): 300mA - The minimum current required to maintain conduction.
️· Latching Current (IL): 1000mA - The current at which the SCR reliably turns on and remains on.
️· Surge Current (ITSM): 70kA – The maximum non-repetitive peak current the SCR can handle for a short duration.
️· Thermal Resistance (Rth(j-h)): 11 °C/W – Indicates how effectively heat is dissipated from the junction to the heatsink.

Switching Characteristics:

️· Gate Trigger Voltage (VGT): 3.5V - The voltage required at the gate to initiate conduction.
️· Gate Trigger Current (IGT): 250mA
️· di/dt: 320A/µs - The maximum rate of change of on-state current.
️· dv/dt: 500V/µs - The maximum rate of change of off-state voltage.

Thermal Considerations:

️· Operating Junction Temperature (Tj): -30°C to 140°C. Staying within this range is critical for reliable operation.
️· Proper heatsinking is vital due to the high power dissipation.

Other Notable Information:

️· Datasheet includes graphs detailing dissipation characteristics (Square Wave and Sine Wave) and On-State characteristics.
️· Specifies Cathode and Gate terminal connection types.
️· Includes information on Transient Thermal Impedance.



In essence, the AT708S08 is a robust, high-current SCR designed for demanding power control applications. The datasheet provides detailed electrical and thermal characteristics to ensure proper selection and implementation.