4N35FM

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Number of Channels:	1
Voltage - Isolation:	7500Vpk
Current Transfer Ratio (Min):	100% @ 10mA
Current Transfer Ratio (Max):	--
Turn On / Turn Off Time (Typ):	2µs, 2µs
Rise / Fall Time (Typ):	--
Input Type:	DC
Output Type:	Transistor with Base
Voltage - Output (Max):	30V
Current - Output / Channel:	--
Voltage - Forward (Vf) (Typ):	1.18V
Current - DC Forward (If) (Max):	60mA
Vce Saturation (Max):	300mV
Operating Temperature:	-55°C ~ 100°C
Mounting Type:	Surface Mount
Package / Case:	6-SMD, Gull Wing
Supplier Device Package:	6-SMD
Base Part Number:	4N35

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Optoisolators - Transistor, Photovoltaic Output

Optoisolator devices, also known as optically coupled isolators, are used to electrically isolate physically two circuits, often in feedback and signal processing systems. The most popular output type of optoisolators is the transistor or photovoltaic output. The 4N35FM is a popular type of optoisolator in this category.

Definition of an Optoisolators -Transistor, Photovoltaic Output

An optoisolator is a device which uses a light-emitting diode (or LED) and a phototransistor to provide electrical isolation between two circuits. The transistor or photovoltaic output type of optoisolator takes the form of a basic transistor switch output, in which the base of the transistor is coupled to an LED, with the LED light triggering the operation of the transistor.

4N35FM Application Field

The 4N35FM optoisolator device, being a Phototransistor output type, is often used in voltage sensitive, or current sense IC interfaces. It has built-in photodiode protection, and can be used in industrial, aerospace and military applications. It has ratings of between 40 Vrms to 300 Vrms of photo-coupling isolation, a 0.3 A continuous collector current, and a 0.6 A pulse collector current. It also has a wide operating temperature range, and is suitable for operation from -40 to +100 degrees Celsius. As with most optoisolator devices, it is also in conformance with the industry standard UL 1577.

Working Principle of 4N35FM

The 4N35FM device has a photodiode (or LED) component and a phototransistor collector component. When current passes through the photodiode, it produces a light signal which is received by the phototransistor collector. This causes the collector to switch "on" and activate the operation of the transistor. The lower current that passes through the device is known as the input current, or "forward current". When this current is interrupted, the transistor closes by the operation of the internal photodiode. Thus, the device has the capability to both operate and to switch off.

Conclusion

The 4N35FM optoisolator device is a widely used device due to its versatility, and the fact that it is capable of providing an electrical isolation between two types of circuits. It is a Transistor, Photovoltaic Output type of optoisolator, and is capable of a wide operating temperature range. Its features also include a lower input current and pulse collector current. Knowing the application field and working principle of the 4N35FM can help engineers and other technical personnel to properly apply this device in various types of applications.

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