BT139 600V 16A Triac

BT139 600V 16A Triac 

The BT139 is a widely used medium-power bidirectional TRIAC designed for AC switching and phase control in a variety of electrical and electronic systems. With a 600 V repetitive peak off-state voltage and a 16 A RMS on-state current rating, the BT139 is capable of handling moderate AC loads in both consumer and industrial applications. The device supports four-quadrant triggering, enabling dependable firing in all AC waveform conditions. It is typically housed in a TO-220 package, which allows for easy mounting and effective heat-sinking for thermal management.

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 Features

• 600 V repetitive peak off-state voltage — suitable for mains AC applications
• 16 A RMS on-state current rating — handles moderate power AC loads
• Bidirectional conduction — enables full AC waveform control
• Four-quadrant gate triggering — flexible and reliable gate response
• Low gate trigger current requirement — easier to drive with low-power circuits
• High surge current capability — withstands inrush and transient conditions
• TO-220 package — convenient mounting and heat-sink options
• Durable and reliable design — suitable for long-term use

Applications

• AC motor control (fans, pumps, small conveyors)
• Light dimming and heating control circuits
• Solid-state relays and AC switches
• Home appliances (washers, ovens, HVAC systems)
• Industrial automation and power control modules
• Phase-angle control for resistive and inductive loads