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Littelfuse's new high-temperature Alternistor triac simplifies thermal management and suppresses high surges
Littelfuse, Inc., a global leader in circuit protection solutions, has recently introduced two new high-temperature Alternistor triacs to its thyristor product line. These new devices, the 16AQJxx16xHx series and the 25AQJxx25xHx series, are specifically designed for AC switching applications where thermal management is a critical challenge. With a maximum junction temperature of 150°C, these triacs offer enhanced performance in environments with limited or no heat dissipation, making them ideal for use in high-temperature industrial and consumer applications.
Engineered to handle high peak currents and single-cycle AC pulses, these triacs are well-suited for heater and motor control systems that often experience significant inrush currents. Their robust design ensures reliable operation under demanding conditions, helping engineers reduce system complexity and improve long-term stability.
The QJxx16xHx and QJxx25xHx series are available in multiple package types, including TO-220 (isolated or non-isolated), TO-263 (D2-PAK), TO-218AC (isolated), and TO-218X (isolated). Each package is designed to provide superior mechanical and thermal stability, ensuring improved field reliability compared to traditional wire-wound alternatives. The internally isolated packages also offer better thermal dissipation and higher insulation voltage, which enhances safety and performance in high-voltage applications.
These triacs are ideal for a wide range of applications, including:
- Coffee machine heater control
- Instant water heaters and infrared heaters
- AC solid-state relays
- Dimmers for incandescent and LED lighting
- Motor speed control in kitchen appliances and power tools
- Compressor motor control in light industrial settings
According to Koichiro Yoshimoto, Business Development Manager at Littelfuse’s Semiconductor Business Unit, “The QJxx16xHx and QJxx25xHx series triacs are designed to operate reliably in high-temperature environments, reducing thermal management challenges such as overheating and downtime. Their sturdy clip-on connection assembly ensures excellent on-site reliability, making them a preferred choice for engineers working on complex AC power control systems.â€
Key features of the QJxx16xHx and QJxx25xHx series include:
- Maximum junction temperature of 150°C for improved thermal performance
- High AITSM ratings (200A/250A) to handle large inrush currents
- Mechanically and thermally stable TO-220/263 and TO-218 clip-on packages
- Internally isolated packaging for better thermal dissipation and insulation voltage
- Available in various package configurations, including tubular and cartridge options
Samples of the QJxx16xHx and QJxx25xHx series are available through authorized Littelfuse dealers worldwide. For more details, visit littelfuse.com or contact Koichiro Yoshimoto directly for technical support.