BTW69-1200 High Surge SCR 50A 1200V Power Thyristor TOP-3

BTW69-1200 High Surge SCR 50A 1200V Power Thyristor TOP-3 is a robust, high-power Silicon Controlled Rectifier (SCR) designed to handle demanding switching and control tasks in industrial and motor control systems. This thyristor offers an exceptional combination of high voltage blocking capability (1200V) and a substantial continuous average current rating (50A). Consequently, it provides the necessary reliability for controlling large DC or rectified AC loads. The key feature of the BTW69-1200 is its impressive surge current capability (I_TSM up to 500 A), making it ideal for managing the large inrush currents commonly found in power supplies and battery chargers. Therefore, design engineers widely select this SCR when requiring a durable and highly protective power switching solution in the field.

Key Features:

• High Blocking Voltage: Features a repetitive peak off-state voltage (V_DRM) of 1200V, providing a wide safety margin in standard 230V_AC industrial applications.
• High Surge Current Capability: Handles non-repetitive surge currents up to 500 A, critical for protecting circuits against short-term power spikes and inrush events.
• High Average On-State Current: Supports a continuous average on-state current (I_T(AV)) of 50 A, enabling the control of high-power loads.
• Fast Turn-On Time: The device switches rapidly, ensuring precise timing and minimal energy loss during the transition phase.
• Insulated Package: Encased in the robust TOP-3 package, which offers low thermal resistance and simplifies mounting onto heatsinks for superior heat dissipation.

Technical Specifications:

• Repetitive Peak Off-State Voltage (V_DRM): 1200 V
• Average On-State Current (I_T(AV)): 50 A (T_C = 85°C)
• Non-Repetitive Peak Surge Current (I_TSM): 500 A (for 10 ms half sine wave)
• Gate Trigger Current (I_GT): Typically 60 mA (Max 100 mA)
• Holding Current (I_H): Typically 100 mA
• Operating Junction Temperature (T_j): −40°C to +125°C

Mechanical Specifications:

• Package Style: TOP-3 (Insulated Tab)
• Mounting: Through-Hole, designed for screw or clip mounting onto a heatsink.
• Insulation Voltage: Isolation capability between terminals and the mounting base (V_ISO) typically 2500 V_RMS.
• Thermal Resistance: Low thermal resistance (R_th(j-c)) ensures efficient heat transfer to the heatsink.

Dimensions:

• Body Length: ≈ 20.0 mm
• Body Width: ≈ 15.5 mm
• Mounting Hole Diameter: ≈ 3.5 mm
• Lead Pitch: Standard TOP-3 configuration
• Total Height: ≈ 4.8 mm

Pinout and Wiring:

• Pin 1 (Cathode – K): Connect to the negative side of the load or the neutral return path of the circuit.
• Pin 2 (Anode – A): Connect to the positive side of the supply voltage; this pin is typically connected internally to the metal mounting tab/flange.
• Pin 3 (Gate – G): Connect to the control circuit (e.g., optocoupler or digital driver) through a current-limiting resistor to trigger the SCR into conduction.
• Wiring Note: The SCR latches ON once triggered until the current drops below the holding current (I_H). Hence, to turn off a DC load, you must momentarily interrupt the anode-cathode current.

Datasheet Reference:

• Download STMicroelectronics BTW69-1200 Thyristor Datasheet

Commonly Used in:

• DC Power Supplies: Used in crowbar protection circuits to shunt surge currents away from sensitive load components.
• Industrial Heating Control: Essential for phase-controlled or burst-fire control of resistive heating elements.
• Battery Charging Systems: Providing high-current switching for controlling large battery charging cycles.

Applications:

• Solid State Relays (SSRs): Forms the main switching element in high-current DC or AC (rectified) SSRs.
• Motor Soft Start Circuits: Controls inrush currents during the startup phase of high-power DC motors.
• Voltage Regulators: Used in conjunction with control circuitry to implement phase control and stabilized output voltage.
• Power Line Protection: Acting as a protective element against excessive voltage transients and surges.

Equivalent Models:

• BTA/BTB Series Thyristors: Other series from ST or NXP offer similar voltage and current ratings, though they might use different package styles.
• T60N87200L (IXYS): A comparable high-power SCR with similar 1200V blocking and high-current capabilities.
• 2P4M (Higher Current SCRs): General class of high current SCRs, requiring careful cross-referencing of voltage and surge specs for direct replacement.

Package Includes:

• 1 x BTW69-1200 High Surge SCR 50A 1200V Power Thyristor TOP-3