1. Device Overview:

️· Device: AT970 Phase Control Thyristor
️· Final Specification Date: February 17 (Issue: 2)

2. Electrical Characteristics (Key Parameters):

️· Repetitive Peak Reverse Voltage (VRRM): (Not explicitly stated, but a key component in the ordering information: “VDRM & VRRM/100”). This likely signifies the part number will reflect the specific VRRM value.
️· Repetitive Peak Forward Voltage (VDRM): (See above)
️· Forward Current (IT(AV)): The dissipation curves show forward current ratings varying with waveform (square wave, sine wave) and heatsink effectiveness. Maximum currents are in the thousands of amps (reaching up to 6000A for square wave).
️· Surge Current: The surge characteristic curve shows the device can handle short-duration, high-current pulses.
️· Operating Junction Temperature (Tj): -30°C to +125°C.

3. Thermal Characteristics:

️· Thermal Impedance (Rth(j-c)): 6.0 °C/kW (Junction to Case) – Double-sided cooling.
️· Thermal Impedance (Rth(c-h)): 1.5 °C/kW (Case to Heatsink) – Double-sided cooling.
️· Mounting Force: 80.0 to 100.0 kN. This indicates the need for strong mechanical pressure for effective heat transfer.

4. Waveform & Dissipation Curves:

️· The document includes graphs showing dissipation characteristics for both square wave and sine wave current waveforms. These curves demonstrate how the permissible forward current (IT(AV)) is affected by the waveform and the heatsink temperature.
️· The dissipation curves illustrate the relationship between forward current and allowable power dissipation for different waveforms.

5. Reverse Recovery Characteristics:

️· Graphs are provided illustrating the reverse recovery charge and current as functions of di/dt. These characteristics are important for understanding switching behavior and potential losses.

6. Ordering Information

️· AT970 S 34 (standard specification). Part numbers will incorporate the VRRM/100 value.

7. Mechanical Details:

️· Cathode Terminal Type: DIN 46244 – A 4.8 – 0.8
️· Gate Terminal Type: AMP 60598 – 1
️· Mass: 3000g
️· Mounting Force: 80.0 - 100.0 kN.

8. Transient Thermal Impedance:

️· The document provides graphs and formulas for calculating the transient thermal impedance (Zth(j-c) and Zth(j-h)) to accurately assess the device's thermal response under various operating conditions. The document provides Ai and τi values that can be used in the provided formula.

Key Takeaways:

️· This is a high-power thyristor intended for demanding applications.
️· Effective heat sinking is *critical* for reliable operation. The high mounting force requirement emphasizes this.
️· The device exhibits characteristics typical of phase control thyristors.
️· The specific VRRM voltage is determined by the part number selected.