PC451

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Number of Channels:	1
Voltage - Isolation:	3750Vrms
Current Transfer Ratio (Min):	40% @ 5mA
Current Transfer Ratio (Max):	--
Turn On / Turn Off Time (Typ):	--
Rise / Fall Time (Typ):	4µs, 5µs
Input Type:	DC
Output Type:	Transistor
Voltage - Output (Max):	350V
Current - Output / Channel:	50mA
Voltage - Forward (Vf) (Typ):	1.2V
Current - DC Forward (If) (Max):	50mA
Vce Saturation (Max):	300mV
Operating Temperature:	-25°C ~ 100°C
Mounting Type:	Surface Mount
Package / Case:	4-SMD, Gull Wing
Supplier Device Package:	4-SMD

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PC451 Application Field and Working PrincipleOptoisolators provide an electrical isolation barrier between a signal source and a connected device. This technology is especially used in areas where safety is of the utmost importance, to prevent dangerous electrical shock, as well as noise reduction. Such applications include medical equipment, hazardous material handling, and automotive electronics. The PC451 Transistor, Photovoltaic Output Optoisolator is a device from the Avago Technologies family of optoisolators, and is ideal for this purpose.The PC451 is designed to isolate the control actuator from the indicator. The Optoisolator features a Photovoltaic Output, which utilizes a light-emitting diode to generate a current. The input section consists of a phototransistor that is powered by a 5V/3W DC supply. The output section consists of an NPN transistor whose collector and emitter are connected to the optoisolator\'s common terminal.The input section of the optoisolator is optical-coupled to the output section, and is designed to function even in noisy environments. When the input voltage exceeds 1.2V, the LED turns on and current flows the first stage. This current generates a ratio-doubling voltage that switches and activates the second stage. In this way, the optoisolator acts as an amplifier to amplify the input signals.As a result of the optoisolator’s design, the output voltage is insulated from the input and does not require additional isolation components. This feature provides the user with operational stability and increased protection against potential electrical accidents.The PC451 is the ideal choice for applications requiring the most reliable and stable isolation. It offers high performance, low power consumption, fast response time, high isolation voltage, and high output current. Furthermore, because of its sophisticated construction and advanced components, the PC451 provides higher levels of safety for the user when working in application areas which are prone to hazardous levels of electrical shock.The Working Principle of the PC451 is relatively simple. When the LED in the input stage is switched on, it produces infrared radiation which is detected by the phototransistor in the output stage. This current activates both the first and second stage of the optoisolator, producing a ratio-doubled voltage. This is then amplified by the transistor in the output stage, generating a linear signal which is then used to control actuator.In conclusion, the PC451 Transistor, Photovoltaic Output Optoisolator is an ideal choice for applications requiring a reliable and stable isolation solution. It offers numerous advantages, including high performance, low power consumption, fast response time, high isolation voltage, and high output current. Furthermore, its advanced construction and components provide users with added safety in hazardous environments.

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