FOD063L

Data Rate:	10Mbps
Supplier Device Package:	8-SO Tall
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	2.7 V ~ 3.3 V
Current - DC Forward (If) (Max):	50mA
Voltage - Forward (Vf) (Typ):	1.75V (Max)
Rise / Fall Time (Typ):	--
Propagation Delay tpLH / tpHL (Max):	90ns, 75ns
Series:	--
Current - Output / Channel:	50mA
Output Type:	Open Collector, Schottky Clamped
Input Type:	DC
Common Mode Transient Immunity (Min):	25kV/µs
Voltage - Isolation:	3750Vrms
Inputs - Side 1/Side 2:	2/0
Number of Channels:	2
Part Status:	Obsolete
Packaging:	Tube

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Optoisolators - Logic Output

A logic output optoisolator, such as the FOD063L, is an integrated circuit which uses light-emitting diodes (LEDs) and photodetectors to provide an electrical isolation barrier between two circuits that allows for communication while maintaining the isolation. This type of component is often used in applications where noise immunity and voltage level shifting between two systems is required, such as in automotive and industrial control systems.

A Typical Application

The FOD063L is typically used to connect digital circuits with different voltage levels and/or levels of noise immunes such as found in microprocessor-based systems. It’s very convenient in applications where a processor inputs signals from a sensors/switches and is then isolated and passed along to an output driver. The typical arrangement includes a logic input, connected to the controlling system, and a logic output, connected to the load. The LED inside the optoisolator provides the necessary electrical isolation which supports the signals between the two systems.

Working Principle

The FOD063L optoisolator works by using the LED inside the device to control the movement of electrons across a gap of air or other material (known as a “dielectric”) between two metallic electrodes. This action causes an electrical potential to develop across the two electrodes. When the LED is on, this potential is the same as the input signal, but when it’s off, the potential drops to near zero, so that no current flows between the electrodes. This principle is used in a number of ways, depending on the number of electrodes present in the optoisolator. In the case of the FOD063L, the electrons are diverted to two paths between the electrodes; one path (known as the “phase path”) is used to turn the signal on, and the other path (“reference path”) is used to turn the signal off. This means that the LED’s on and off states are controlled by the input logic signal, allowing the device to operate as an optoisolator.

Advantages of Optoisolators

The use of optoisolators, like the FOD063L, offers a number of advantages over other types of isolation components. For starters, they provide a lower power draw than other isolation techniques, since the only energy required is for the LED, which can be driven with very low currents. Secondly, they provide extremely robust noise immunity, since the electric current is relayed using light sources rather than electric signals, which can be degraded by interference. Finally, the optoisolator’s low voltage operation offers greater safety, since accidental contact with the output side of the device will not cause a short circuit.In summary, the FOD063L optoisolator is an ideal solution for applications that require noise immunity and voltage level shifting between two systems. Its working principle is based on LED-controlled current diversion, which allows it to offer low power draw, robust noise immunity and low voltage operation. As such, optoisolators are becoming increasingly popular, and the FOD063L is one of the most popular models in its class.

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