2N685A

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Thyristors – SCRs are a type of semiconductor devices featured by the control of electrical energy or power over current or voltage. The 2N685A is a current-sensitive SCR which means it operates based on a change in current rather than a variation in voltage. It is particularly designed for a wide range of commercial, industrial, and military jobs requiring the control of high currents.

In terms of its application field, the 2N685A is often used in mains-operated AC circuits. It is suitable for applications that require controlled circuit disconnection, efficient rectification, low-firing angle control, current limiting, or electronic switching, ranging from 10A to 45A. Moreover, the 2N685A can be used in power supplies, motor control systems, temperature controllers, and machine tools, as well as other industrial equipment.

The 2N685A integrates a PNPN thyristor structure in a two-lead TO-220 package, which enables it to deliver maximal efficiency in operations like light dimming and power switching in a compact size. It has an average on-state current that can achieve 20A, with an on-state voltage below 1.5V at 45A current. Furthermore, the holding current of the 2N685A is around 7A, and it normally requires at least 3A inlet to initiate switching.

Therefore, when using the 2N685A, the external gate voltage should adjust the device’s operating and switching state. And when this voltage is greater than 0.3V to 0.5V (which is at a temperature between 40 ℃ and 80 ℃), the device will be turned off and then reset. This working principle also gives the 2N685A an ability to interrupt AC circuits when required.

To sum up, the 2N685A is a current-sensitive SCR specifically designed for various applications that require the control of high currents and rising. It offers reliable performance with a maximum on-state current of 20A, an on-state voltage of 1.5V at 45A current, and a holding current of 7A. Most importantly, the 2N685A operates based on a change in current rather than a variation in voltage, justifying its great applicability for mains-operated AC circuits.

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