The popular 1N4148 signal diode is ideal for use in many low current circuits. Rated at 200mA, 100V breakdown the diode has 4ns (nanosecond) reverse recovery time making it useful for signal processing and other high frequency applications.
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This signal diode is ideal when you need the reverse current flow protection characteristics of a diode but not the power flow. This is common in high frequency signal processing or low current circuits.
If you need to control high power flow then consider a 1N4001 rectifier diode.
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