BTA26AB Triac Technical Summary

Overview

The BTA26AB is a high-performance triac belonging to the BTA26 A/B and BTB26 B family, designed for robust switching applications in AC circuits. This component is optimized for high-voltage and high-current operations, making it suitable for industrial and consumer electronics. With its repetitive peak off-state voltage (V_DRM/V_RRM) options ranging from 400V to 800V, the BTA26AB provides flexibility for various power control needs. Its construction ensures reliable performance under high-temperature conditions, with a maximum junction temperature (T_j) of 125°C.

Features

• High Voltage Ratings: Available in 400V, 600V, 700V, and 800V variants to accommodate diverse application requirements.
• High Current Capability: Designed to handle substantial load currents, making it ideal for power control applications.
• Robust Construction: Ensures reliability under high-temperature and high-stress conditions.
• Low Gate Trigger Current: Facilitates easy triggering with minimal control circuitry.
• Isolated Tab (BTA26AB): Provides electrical isolation for safer mounting and thermal management.
• Snubberless Design: Reduces the need for external snubber circuits in many applications, lowering system cost and complexity.
• High Commutation Capability: Ensures stable performance in inductive load scenarios.

Applications

The BTA26AB triac is widely used in AC power control applications, including:

• Industrial Equipment: Motor controls, industrial heaters, and welding equipment.
• Home Appliances: Dimmer switches, washing machines, and air conditioners.
• Lighting Systems: High-power incandescent and LED dimming circuits.
• Power Tools: Variable-speed controls for drills, saws, and sanders.
• Automotive: Auxiliary power controls and heating systems.

Electrical Characteristics

Absolute Maximum Ratings

• Repetitive Peak Off-State Voltage (V_DRM/V_RRM): 400V, 600V, 700V, 800V (depending on variant)
• RMS On-State Current (I_T(RMS)): Up to 26A
• Non-Repetitive Surge Current (I_TSM): 260A (peak)
• Gate Trigger Current (I_GT): 35mA (max)
• Gate Trigger Voltage (V_GT): 1.5V (max)
• Junction Temperature (T_j): -40°C to +125°C
• Storage Temperature (T_stg): -40°C to +150°C

Thermal Characteristics

• Thermal Resistance Junction to Case (R_th(j-c)): 1.5°C/W
• Thermal Resistance Junction to Ambient (R_th(j-a)): 60°C/W

Package Information

The BTA26AB is available in a TO-220AB insulated package, which provides mechanical robustness and efficient thermal dissipation. Key package details include:

• Package Type: TO-220AB (isolated tab)
• Mounting Style: Through-hole
• Pin Configuration:
  • Pin 1: Main Terminal 2 (MT2)
  • Pin 2: Gate (G)
  • Pin 3: Main Terminal 1 (MT1)
• Dimensions: 10.4mm x 4.6mm x 15.75mm (L x W x H)
• Weight: Approximately 2.0 grams
• Isolation Voltage: 2500V RMS (between tab and pins)

Performance Characteristics

Switching Performance

• Turn-On Time (t_gt): 2µs (typical)
• Turn-Off Time (t_q): 10µs (typical)
• Critical Rate of Rise of Off-State Voltage (dv/dt): 50V/µs (min)

On-State Characteristics

• On-State Voltage Drop (V_TM): 1.55V (max at I_T(RMS) = 26A)
• Holding Current (I_H): 50mA (max)

Reliability and Compliance

The BTA26AB complies with international standards for safety and performance, including:

• UL certification
• RoHS compliance
• REACH compliance

Conclusion

The BTA26AB triac is a versatile and reliable component for AC power control applications, offering high voltage and current ratings, robust thermal performance, and ease of integration. Its snubberless design and isolated package make it an excellent choice for both industrial and consumer electronics. Engineers can leverage its high commutation capability and low gate trigger requirements to design efficient and cost-effective power control systems.