The 2N691 is a high-reliability silicon controlled rectifier (SCR) designed for precise power control and switching in demanding aerospace, defense, and industrial environments. Packaged in a robust TO-48 / TO-208AA stud-mount metal case, it offers excellent thermal conductivity, mechanical strength, and long-term operational stability. As a member of the 2N68x–2N69x family of reverse-blocking SCRs (2N681–2N692), it provides superior electrical performance and consistency across mission-critical systems.
The 2N691 offers a repetitive peak off-state voltage (V_DRM / V_RRM) of approximately 800 V, an RMS on-state current of 25 A, and a non-repetitive surge current of up to 150 A. It is available as standard, JAN, or JANTX-qualified per MIL-PRF-19500/108, ensuring high reliability and traceability for aerospace and military-grade applications.
When a gate trigger signal is applied, the SCR conducts from anode to cathode and remains latched until the current falls below its holding level, allowing controlled switching and rectification in AC and DC power systems.
Anode – threaded stud (mount)
Cathode – main terminal lead
Gate – control input lead
Military and aerospace power control systems
Industrial motor drives and automation
High-reliability power rectifiers and converters
Pulse discharge and energy storage systems
Defense and avionics-grade power supplies
Pros: High surge handling, robust thermal design, JAN-qualified reliability, excellent long-term stability.
Cons: Requires gate drive current; slower response than fast-switching semiconductor devices.
Peak Repetitive Reverse Voltage VRRM:700
Peak Repetitive Off-State Voltage VDRM:700
Average On-State Current IAVA:16
Max Off-State Current IRRM,IDRMmA:2.25
Peak Non-Repetitive Surge Current ITSM @ Ipp AMPS:150
Gate Trigger Voltage VGTV:2
Gate Trigger Current IGTmA:40
Peak On-State Voltage VTM:2
Holding Current IHmA:20
Package:TO-48