IRFY140

The Infineon IRFY140 is a 100V N-channel power MOSFET engineered for high-reliability applications and hermetically sealed in a TO-257AA package, a platform commonly selected where radiation tolerance, thermal efficiency, and long-term stability are non-negotiable. Typical for the IRFY family, this device uses Infineon’s proven HEXFET technology to combine low on-state resistance with fast switching performance, enabling efficient power management under demanding electrical and environmental stress. The TO-257AA outlines a low-profile, surface-mountable or through-hole mounted hermetic metal package that provides excellent thermal dissipation and a lightweight footprint compared to older TO-254 and TO-258 equivalents, making it suitable for systems with strict size, weight, and power constraints.

Primary deployment scenarios span satellite power distribution buses, deep-space probe DC-DC converters, military phased-array radar power supplies, and high-altitude avionics where single-event burnout and gate rupture immunity are critical. These MOSFETs are often built to MIL-PRF-19500 screening levels and can be supplied with radiation hardness assurance testing, making them standard choices for bus regulation, battery discharge switching, and motor drive inverters in long-duration, inaccessible equipment. From a procurement standpoint, the IRFY140 series is positioned within Infineon’s high-reliability portfolio with sustained production and traceability, though designers should anticipate lead times governed by lot-level radiation characterization and should verify the applicable source control drawing or specification sheet. Long-term support and authorized distribution channels help mitigate obsolescence risk in programs that demand configuration-controlled, space-grade discretes.