H11A817

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):	200mV
Current - DC Forward (If) (Max):	50mA
Voltage - Forward (Vf) (Typ):	1.2V
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):	600% @ 5mA
Current Transfer Ratio (Min):	50% @ 5mA
Voltage - Isolation:	5300Vrms
Number of Channels:	1
Part Status:	Obsolete
Packaging:	Tube

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Optoisolators - Transistor, Photovoltaic OutputAn optoisolator, or optocoupler, is a device designed to transmit an input signal between two isolated systems while protecting the driver and the controlled circuit from each other.The H11A817 optoisolator is a four-pin transmissive optocoupler consisting of an infrared LED emitter and a photovoltaic (PV) output. This device uses a transistor output to detect an input pulse and is suitable for applications such as pulse-width-modulation (PWM) control and frequency divider applications. The H11A817 optocoupler works on the principle of photocoupling. In this device, the input signal is transmitted from one circuit to the other across an air gap through the use of light. The output of the optocoupler depends on the input intensity. When the LED on the is illuminated by the input, it causes a current to flow through the photoconductor also known as the photovoltaic cell, generating a voltage across the cathode and anode of the output transistor. In terms of its application field, the H11A817 optoisolator is used for interfacing control circuits such as microcontrollers operating at voltages as high as 40 volts with power switching circuits. Additionally, the optocoupler works as a gate between high-efficiency and low-efficiency power switching systems.The device has an isolation voltage of up to 3500V between the input and output circuits. This ensures a high level of safety and prevents the driver and the controlled circuit from shorting out. It is said to have a fast switching speed and can achieve transmission and reception rates of up to 3.5 MHz at a switching current of 10mA.In order to ensure reliable operation, the H11A817 optocoupler should be connected to circuits with similar working voltages. The LED in the optocoupler is driven by a current source and the LED current should be kept between 10mA and 30mA to ensure maximum efficiency in operation. Additionally, the LED should be mounted on a proper heat sink so as to avoid overheating.Overall, the H11A817 optocoupler is an extremely useful device for interfacing control circuits and power switching circuits. Its ability to provide a high level of safety and fast switching speed makes it ideal for pulse width modulation and frequency divider applications. However, it is important to keep the LED within its specified current range and mount it on a heat sink in order to ensure reliable operation.

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