General Description

In high-power home appliances, industrial AC voltage regulation, motor speed control and heating load control circuits, the TRIAC serves as a contactless AC switch. Its voltage withstand capability, current-carrying capacity, triggering stability and thermal performance directly determine overall system reliability.

The Slkor BTA41-800B is a four-quadrant bidirectional thyristor (TRIAC) in a TO-3P power package. It features an 800V repetitive peak off-state voltage, 40A RMS on-state current, a maximum gate trigger current of 50mA and a gate trigger voltage of 1.5V. Supporting bidirectional AC conduction with excellent thermal dissipation, it is a cost-effective domestic choice for medium-to-high-power AC switching and phase-control applications.

Key Specifications

• Repetitive peak off-state voltage (VDRM): 800V
• RMS on-state current (IT(RMS)): 40A
• Maximum gate trigger current (IGT): 50mA
• Gate trigger voltage (VGT): 1.5V
• Package: TO-3P

Product Advantages

1. 800V High Voltage Withstand for Mains Applications

With an 800V off-state voltage rating, the device reliably handles mains surges and voltage spikes, reducing the risk of high-voltage breakdown. It is well suited for 220V AC grid systems in home appliances and industrial control equipment.

2. 40A High Current-Carrying Capacity for Heavy Loads

The 40A RMS on-state current enables it to drive high-power heating elements, AC motors and other heavy loads, meeting the current demands of water heaters, high-power temperature-control equipment and motor drives. It offers strong load-handling capability and excellent surge resistance.

3. Friendly Triggering Conditions, Simple Control Circuitry

With a typical gate trigger voltage of 1.5V and a maximum trigger current of 50mA, the device can be directly driven by conventional MCUs and optocouplers without complex peripheral drive circuitry, simplifying hardware design. Four-quadrant triggering ensures reliable conduction in both positive and negative half-cycles, delivering balanced and stable AC waveform control.

4. TO-3P Power Package with Superior Thermal Dissipation

The standard TO-3P power package supports direct heatsink mounting with low thermal resistance, keeping temperature rise under control during continuous high-power operation. It is easy to assemble and compatible with industry-standard footprints, enabling direct replacement of imported TRIACs of the same type.

5. Mature Process with High Batch Consistency

Backed by Slkor's mature thyristor manufacturing process, the device delivers strong commutation capability, excellent dV/dt immunity, low batch-to-batch parameter variation and strong anti-interference performance — ideal for high-volume production of home appliances and industrial equipment.

Applications

Widely used in AC phase control and contactless switching:

• Instantaneous electric water heaters
• High-power heater temperature control
• AC motor speed regulation
• Dimming and power-regulation circuits
• Solid-state relays (SSRs)
• Washing machines and high-power small home appliances
• Industrial voltage-regulation modules
• Fan and pump control
• Lighting power adjustment

Engineering Design Recommendations

Thermal Design: A properly rated heatsink must be matched for 40A high-current operation to control junction temperature and prevent overheating damage.

Drive Circuit: Add a current-limiting resistor in the gate loop to keep the trigger current within a reasonable range, preventing gate overcurrent damage.

Inductive Loads: When driving motors, transformers and other inductive loads, add an RC snubber circuit to suppress voltage spikes and prevent false triggering.

PCB Layout: Widen main power traces to reduce high-current loop impedance; separate power loops from weak trigger signal traces to minimize interference.

Summary

The Slkor BTA41-800B TRIAC combines an 800V voltage rating, 40A on-state current and a TO-3P high-power package. With simple and reliable triggering, it targets 220V AC high-power loads and is suitable for heating, motor speed control, AC switching and various phase-control circuits — making it a preferred domestic thyristor device for high-power home appliances and industrial control.

BTA41-800B To Product Pag