4N27X

Output Type:	Transistor with Base
Supplier Device Package:	6-DIP
Package / Case:	6-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 100°C
Vce Saturation (Max):	500mV
Current - DC Forward (If) (Max):	60mA
Voltage - Forward (Vf) (Typ):	1.2V
Current - Output / Channel:	50mA
Voltage - Output (Max):	30V
Series:	--
Input Type:	DC
Rise / Fall Time (Typ):	2µs, 2µs
Turn On / Turn Off Time (Typ):	--
Current Transfer Ratio (Max):	--
Current Transfer Ratio (Min):	10% @ 10mA
Voltage - Isolation:	5300Vrms
Number of Channels:	1
Part Status:	Active
Packaging:	Tube

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Introduction

Optoisolators are solid-state isolation devices that use optical technology to provide electrical isolation between different circuits. In this article, we will focus on 4N27X optoisolators, specifically in terms of their application field and working principle.

Application Field of 4N27X Optoisolators

4N27X optoisolators are typically used in automotive and industrial electrical/electronic applications. In particular, they are used in various safety-critical applications such as ABS (anti-lock brake system) and power steering systems, as well as for power supply isolation in control systems and communication systems. In these applications, 4N27X optoisolators are used to prevent current flow between the high-voltage and low-voltage power supplies.

Working Principle of 4N27X Optoisolators

The 4N27X optoisolator consists of a phototransistor and an infrared light emitting diode (LED). The LED and the transistor are connected in series so that the output of the device is the reverse of the input. The LED emits infrared light, which is detected by the phototransistor. The phototransistor then amplifies the received signal and switches it to the output. The 4N27X can be split into two sections: the input side, which receives the current from the power source, and the output side, which controls the operation of the device. The input side of the 4N27X optoisolator functions by allowing the current from the power source to pass through the LED in the optoisolator. The LED then emits infrared light, which is detected by the phototransistor. The phototransistor then amplifies the signal and switches it to the output side of the optoisolator. On the output side, the signal is then used to control the device’s operation.

Conclusion

4N27X optoisolators are used primarily in automotive and industrial applications where electrical isolation and safety are critical, such as ABS systems, power steering systems, and power supply isolation systems. The 4N27X optoisolator works by allowing the current from the power source to pass through the LED in the optoisolator, which then emits an infrared light that is detected by the phototransistor. The phototransistor amplifies the signal and switches it to the output side of the optoisolator to control the device’s operation.

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