Slkor BTA26-800B TRIAC: 800V Withstand Voltage, 25A TO‑3P Package 3‑/4‑Quadrant AC Switch Thyristor

1. Core Product Parameters

Package Type: TO-3P, insulated tab; heat-sink tab has no electrical connection with T2 terminal. RMS On-state Current: 25A Repetitive Peak Off-state Voltage: 800V Maximum Gate Trigger Voltage: 1.5V Peak Gate Current: 6A Storage Temperature Range: -40℃~150℃ Operating Junction Temperature Range: -40℃~125℃ On-state Voltage Drop: 1.55V Maximum Gate Trigger Current: 50mA Maximum Holding Current: 80mA Junction-to-Case Thermal Resistance: 1.1℃/W Junction-to-Ambient Thermal Resistance: 50℃/W Critical Rate of Rise of On-state Current: ≥50A/μs Critical Commutation Voltage Rise Rate: minimum 400V/μs, up to 1000V/μs for partial quadrants.

Pin Definition: Pin1=T1, Pin2=T2, Pin3=Gate(G), Pin4=Heat-sink Tab.

2. Key Product Features

1. Supports 3-quadrant and 4-quadrant triggering mode, and can conduct controllably in both positive and negative half-cycles of AC power.
2. Insulated TO-3P package. The heat-sink tab is electrically isolated from T2 pin, no extra insulating gasket is required for heat sink to reduce assembly complexity.
3. Maximum gate trigger voltage is 1.5V. It can be triggered reliably by common logic signal with simple driving circuit.
4. High tolerance for rising speed of on-state current and commutation voltage, resisting surge voltage and current impact in AC circuits.
5. Defined holding-current parameter guarantees reliable device turn-off under proper circuit conditions.
6. Low junction-to-case thermal resistance, supporting high AC operating current with matched heat sink.
7. Wide temperature range. Storage temperature ranges from -40℃ to 150℃, and maximum operating junction temperature reaches 125℃ for high-low temperature working conditions.

3. Main Application Fields

1. Household appliances: AC load power control for washing machines, vacuum cleaners, massagers and other household equipment.
2. Solid-state relays: works as core AC power-switch component for solid-state relays.
3. AC motor speed regulation: used for voltage-adjusting and speed-regulating circuit of AC motors.
4. Other AC power-control equipment for AC load switching and voltage adjustment.

4. Suggestions for Engineering Design

1. Thermal design: Junction-to-case thermal resistance is 1.1℃/W and junction-to-ambient thermal resistance is 50℃/W. Do not run at full load for long time without heat sink. Heat sink must be applied in practical use. Actual operating current shall be limited according to case temperature. Allowable operating current will decrease with lower conduction angle.
2. Driving design: The maximum gate trigger voltage is 1.5V and maximum trigger current is 50mA. The driving circuit shall provide sufficient gate current for reliable triggering. The peak gate current shall not exceed 6A to avoid gate damage. Trigger current and trigger voltage change with ambient temperature, so enough driving margin should be reserved under low-temperature conditions.
3. Turn-off reliability: Pay attention to holding-current in circuit design. The TRIAC can turn off automatically only when load current drops below holding current. It cannot turn off itself if load current exceeds holding current.
4. Anti-interference design: The device is sensitive to voltage rising rate. RC snubber circuit can be added for circuits with heavy surge voltage to prevent false triggering.
5. Assembly notes: Though the TO-3P package is insulated, avoid pin short-circuit during installation and ensure tight contact between heat-dissipation surface and heat sink.
6. Voltage selection: Reserve sufficient voltage margin for AC applications. The 800V version is preferred for 220V RMS AC mains control.

5. Product Summary

BTA26-800B is a medium-power bidirectional TRIAC for AC power-control applications. With 25A RMS current rating, 800V withstand voltage and insulated TO-3P package, it balances power capability and assembly convenience. It features good surge-withstand performance, and its trigger parameters match conventional driving circuits. It is widely adopted in household appliances, solid-state relays and AC motor speed-regulation systems. For long-term stable operation in practical projects, proper heat-sink matching, sufficient gate-driving margin and surge suppression measures should be implemented.

About Slkor：

Slkor has research and development offices in Busan, South Korea, Beijing, China, and Suzhou, China. Most of the wafer manufacturing and packaging and testing are carried out within China. The company employs and collaborates with individuals and organizations worldwide, with a laboratory for product performance and reliability testing and a central warehouse located at its headquarters in Shenzhen. Slkor has filed for over a hundred invention patents, offers more than 2,000 product models, and serves over ten thousand customers globally. Its products are exported to countries and regions including Europe, the Americas, Southeast Asia, and the Middle East, making it one of the rapidly growing semiconductor companies in recent years. With well-established management systems and streamlined workflows, Slkor has rapidly enhanced the brand awareness and reputation of its "SLKOR" brand through its outstanding quality and standardized services. Its product range includes three major series: diodes, transistors, and power devices, with recent introductions of new products such as Hall elements and analog devices, expanding its presence in sensors, Risc-v microcontrollers, and other product categories.

BTA26-800BTo Product Page