1N4937

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Diode Type:	Standard
Voltage - DC Reverse (Vr) (Max):	600V
Current - Average Rectified (Io):	1A
Voltage - Forward (Vf) (Max) @ If:	1.2V @ 1A
Speed:	Fast Recovery = 200mA (Io)
Reverse Recovery Time (trr):	150ns
Current - Reverse Leakage @ Vr:	5µA @ 600V
Capacitance @ Vr, F:	12pF @ 4V, 1MHz
Mounting Type:	Through Hole
Package / Case:	DO-204AL, DO-41, Axial
Supplier Device Package:	DO-41
Operating Temperature - Junction:	-50°C ~ 150°C
Base Part Number:	1N4937

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The 1N4937 is a single diode power rectifier. It\'s a member of a family of similar diodes known as 1N4937s, classified as single rectifiers consisting of two separate semiconductor layers. The 1N4937 is a high-speed epoxy-molded diode that features an axial lead design suitable for surface-mount technology (SMT). In addition, it has a low dynamic impedance for high frequency performance applications.The 1N4937 is a power rectifier diode designed for high-power gain. It is available in through-hole or surface mount packages directly from the manufacturer or via distributors. It’s offered in a variety of breakdown voltages, ranging from 50V to 1kV. Other features include a low capacitance, low forward voltage drop, a high blocking voltage, and low reverse leakage current.The 1N4937 is widely used in power supply systems. It is ideal for electronic overcurrent protection as it reacts quickly and reliably to overcurrent faults. It is often used in automotive, computer, telecommunication, and consumer electronics applications.The 1N4937 is designed for high-performance applications in which the diode\'s low forward voltage drop, low capacitance, and high blocking voltage are desired. For example, it can be used in AC/DC rectification circuits to switch high-frequency AC into a DC power source for switching converters; current limiting for intelligent terminal power supplies; polarity protection in consumer electronics; and remote control/lighting circuits.The working principle of the 1N4937 is similar to that of any two-terminal semiconductor device. It has a reverse-biased state in which the junction between the two semiconductor layers is in a nonconducting state, and a forward-biased state in which the junction is in a conducting state. In the reverse-biased state, the diode blocks current flow and appears to be a perfect open circuit. In the forward-biased state, the diode acts as a resistor, allowing some current to pass through it. Thus, the 1N4937 can be used in a variety of circuits to regulate voltage, current, or other conditions.When the anode (positive) terminal of the diode is connected to a higher voltage source than the cathode (negative) terminal, the depletion region between the two terminals widens and the voltage across the terminals is reverse-biased. The electric field generated by the applied negative voltage repels the majority carriers from the p-region, and keeps the junction in a normally-off state. Thus, in the reverse-biased state, the 1N4937 functions as an open circuit.On the other hand, when the anode terminal is connected to a lower voltage source than the cathode terminal, the electric field is reversed, attracting the majority carriers and narrowing the depletion region. This causes the voltage across the terminals to become forward-biased, and the diode turns on. In the forward-biased state, the 1N4937 functions as a resistor, allowing some current to pass through the device.In summary, the 1N4937 is a single-diode power rectifier that is widely used in power supply systems and other high-power gain applications. It has a low forward voltage drop, low capacitance, and high blocking voltage. It is designed for high-performance applications in which its low capacitance, low forward voltage drop, and high blocking voltage are desired. The working principle of the 1N4937 is based on the two-terminal diode\'s reverse- and forward-biased states.

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