HCPL-7721-500E Isolators

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Number of Channels:	1
Inputs - Side 1/Side 2:	1/0
Voltage - Isolation:	3750Vrms
Common Mode Transient Immunity (Min):	10kV/µs
Input Type:	Logic
Output Type:	Push-Pull, Totem Pole
Current - Output / Channel:	10mA
Data Rate:	25MBd
Propagation Delay tpLH / tpHL (Max):	40ns, 40ns
Rise / Fall Time (Typ):	9ns, 8ns
Voltage - Forward (Vf) (Typ):	--
Current - DC Forward (If) (Max):	--
Voltage - Supply:	4.5 V ~ 5.5 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	8-SMD, Gull Wing
Supplier Device Package:	8-DIP Gull Wing

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Optoisolators - Logic Output: HCPL-7721-500E Application Field and Working PrincipleOptoisolators are useful tools to isolate a high voltage circuit from a low voltage one. They allow the user to protect against transient voltage spikes, such as those that occur during electrical surges. Optoisolators, specifically Logic Output (LO) optoisolators, also provide efficient data transmission over long distances. Therefore, their applications can be found across many industries—from telecom routers to security systems and automated industrial equipment.The HCPL-7721-500E from Avago Technologies is an example of such an LO optoisolator. This device is an 8-pin, dual channel phototransistor optoisolator designed for use in logic control and interface applications between a low voltage logic-level input signal and a higher voltage, higher current output circuit. As such, it can be used to control AC motor drives, motor controller valves, and other similar applications where isolation is required.The HCPL-7721-500E is a cascadable, monolithic integrated circuit device that operates on low voltage supplies. It contains two phototransistor output circuits in an optically isolated package, each with a trigger LED, and an integrated driver circuit. The optoisolator has a guaranteed temperature range of -55°C to +125°C, and a guaranteed logic signal input range of 0.4 to 3.5 V. This level of reliability makes the HCPL-7721-500E appropriate for use in a variety of computer and industrial control applications.The key to optoisolator technology is its working principle. In an LO optoisolator, an LED or other light source is positioned close to a photosensitive device, such as an amplifier or photodetector. The light source is driven by an input signal, and this causes the photosensitive device to generate an output signal. The output is then used to drive the required load, ensuring that the signal is isolated from the source. The HCPL-7721-500E optoisolator works in a similar fashion. An input LED driver circuit triggers an internal LED, which is coupled to two output phototransistor devices. The phototransistors respond to the emitted light, generating an output signal that is proportional to the input. This output signal can then be used to drive higher voltage loads, thus providing isolation between the input and output circuits.The HCPL-7721-500E optoisolator has a number of benefits for both industrial and consumer users. Its low voltage requirements and monolithic integrated circuits make it suitable for use in computers and other devices where low power consumption is important. Its guaranteed temperature range and logic signal level makes it an ideal choice for industrial control applications. And perhaps most importantly, it provides excellent high voltage isolation, protecting the user’s device and its contents from electrical spikes and other potentially damaging conditions.In short, the HCPL-7721-500E optoisolator from Avago Technologies is a reliable and versatile solution for users looking to isolate low voltage logic signals from higher voltage loads. Its working principle is based on the same principles that apply to all optoisolators, and its specifications make it suitable for a range of applications in both the commercial and industrial sectors. As such, it is a valuable tool for anyone who needs to ensure the safety and efficiency of their device.

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