4N38SD

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Number of Channels:	1
Voltage - Isolation:	5300Vrms
Current Transfer Ratio (Min):	20% @ 10mA
Current Transfer Ratio (Max):	--
Turn On / Turn Off Time (Typ):	5µs, 5µs
Rise / Fall Time (Typ):	--
Input Type:	DC
Output Type:	Transistor with Base
Voltage - Output (Max):	80V
Current - Output / Channel:	100mA
Voltage - Forward (Vf) (Typ):	1.15V
Current - DC Forward (If) (Max):	80mA
Vce Saturation (Max):	1V
Operating Temperature:	-55°C ~ 100°C
Mounting Type:	Surface Mount
Package / Case:	6-SMD, Gull Wing
Supplier Device Package:	6-SMD
Base Part Number:	4N38

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Optoisolators - Transistor, Photovoltaic Output

Optoisolators are electronic components that are used to transfer electrical signals between two separate circuits without any direct electrical connection. An optoisolator, also known as optical coupling, consists of an infrared LED light source, a light-sensitive device, and often an associated photodiode. The LED generates light when an input voltage is applied, which is detected by the photodiode. This causes a small electrical current to flow in the second circuit, which in turn, is used to trigger electronic components.One type of optoisolator is the 4N38 series, which is a three-pin optoisolator available in the form of a small package. This optoisolator has a transistor output type with a photovoltaic output. The 4N38 is typically used for isolation, voltage and current sensing, and voltage-sensing feedback applications.The 4N38 optoisolator comes with a built-in LED that is used to provide light signals to the photodiode. The LED is connected to the input circuit and allows a small electric current to flow when a voltage is applied. The function of the photodiode is to detect the electric current in the second circuit, which “triggers” the associated electronic component.The transistor output type with a photovoltaic output of the 4N38 optoisolator has a wide range of applications. It can be used to detect high-voltage signals, DC voltage, and AC voltage signals. It is commonly used in feedback control circuits and for electrically isolating high voltages or signals from sensitive electronic components. For example, this optoisolator can be used as a control in a garage door where the LED is activated by the current supplied by a button.The 4N38 optoisolator is also widely used in motors and motor control. Here, the optoisolator is used to detect the voltage of the motor, which is then relayed to the control circuit in order to determine when to turn the motor on or off. This ensures that the motor is not overloaded or damaged due to excessive strain.Another common application of the 4N38 optoisolator is in power converters and other high-power modules that require isolation. The optoisolator provides electrical isolation between the input and output circuits which prevents electrical interference between the circuits and also ensures safety.In addition, the 4N38 can also be used to detect over-current, over-voltage, and over-temperature conditions. This is done by using a voltage reference source combined with the optoisolator. An overvoltage condition will cause the voltage reference to exceed the voltage threshold, giving the optoisolator an output signal. This will, in turn, trigger the associated circuit to shut down.The 4N38 optoisolator is also used as a digital display component. The optoisolator is connected to the display panel and the LED is triggered via input signals, allowing information to be displayed on the digital display.The 4N38 series of optoisolators is a widely used device with many applications. It is an electronic component that is designed to transfer electrical signals between two separate circuits without any direct electrical connection. The LED of the 4N38 produces light when an input voltage is applied that is detected by the associated photodiode, triggering the electronic component in the second circuit. The optoisolator is capable of detecting high-voltage signals, DC voltage, and AC voltage signals. It’s commonly used in motor control, feedback control, electrically isolating high voltages, over-current detection, over-voltage protection, over-temperature protection, and digital display. The advantages of using an optoisolator are that it eliminates noise interference and ensures safety.

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