NTE66 14 amp mosfet n–channel enhancement mode high speed switch
The NTE66 is a TMOS Power FET in a TO220 type package designed for high voltage, high speed power switching applications such as switching regulators, converters, solenoid and relay drivers.
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Image for illustrative purpose only

Features:
Lower RDS(ON)
Improved Inductive Ruggedness
Fast Switching Times
Lower Input Capacitance
Extended Safe Operating Area
Improved High Temperature Reliability

Manufacturer datasheet - NTE66 (Adobe Reader required to read datasheet)