H11A617B

Output Type:	Transistor
Supplier Device Package:	4-DIP
Package / Case:	4-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 100°C
Vce Saturation (Max):	400mV
Current - DC Forward (If) (Max):	50mA
Voltage - Forward (Vf) (Typ):	1.35V
Current - Output / Channel:	50mA
Voltage - Output (Max):	70V
Series:	--
Input Type:	DC
Rise / Fall Time (Typ):	2.4µs, 2.4µs
Turn On / Turn Off Time (Typ):	--
Current Transfer Ratio (Max):	125% @ 10mA
Current Transfer Ratio (Min):	63% @ 10mA
Voltage - Isolation:	5300Vrms
Number of Channels:	1
Part Status:	Obsolete
Packaging:	Tube

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Optoisolators - Transistor, Photovoltaic Output

An optoisolator is a device used to electrically isolate sensitive electronic parts from each other. It is composed of a light-emitting diode ("LED") and a photo-sensitive transistor typically used to protect ungrounded input ports from signals, noise, and voltages exceeding the maximum allowable voltage range of inputs. The H11A617B is an optoisolator in a TO-220 package. This optoisolator is designed to pass voltage in either direction, allowing it to be used as a general-purpose optoisolator.The H11A617B has a current transfer ratio (CTR) of 1000%, which is very good for a standard optoisolator. This means it can withstand relatively high voltage without damaging other components and can handle up to 5A of current without breaking down. Additionally, it has a LED voltage drop of 5V, allowing it to be used in a wide variety of applications. The H11A617B optoisolator is typically used in signal isolation and protection circuits to ensure electrical safety in signal lines and power connections. It\'s designed to work with both AC and DC signals, and can be used in computer systems, robotics, communications, security systems, and other electronic applications.To understand the working principle of the H11A617B, let\'s consider how it works when a circuit is connected in the forward mode. The circuit is connected with an AC source and the LED is forward biased with a certain DC voltage. As the LED emits light, photodiodes in the photo-sensitive transistor are excited and starts to conduct current, which passes through the transistor to ground. This provides a current path for the AC current, which is then passed through to the output circuit, which is also isolated by the optoisolator.When in the reverse mode, the same process happens, however, the current is sourced from the output circuit and is passed through the optoisolator in the opposite direction. When the LED is set to a certain reverse-bias voltage, it is able to block the current and ensure the output circuit is protected from any potential damage.Aside from providing isolation, the H11A617B is also designed to protect circuits from over-voltage spikes and transients. The use of the LED and photo-diode combination allows the device to provide reliable protection with minimal noise, vibration, and component fatigue. This makes it ideal for use in both AC and DC circuits.The H11A617B is a versatile optoisolator, suitable for use in a wide range of applications. Its high CTR and low-voltage drop make it ideal for protecting circuits from over-voltage/overcurrent/transient situations, and its compatibility with AC and DC circuits make it ideal for signal isolation and protection. Its wide range of features and reliability make it a convenient and widely used optoisolator in many applications.

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