4N28S1(TB)

Output Type:	Transistor with Base
Supplier Device Package:	6-SMD
Package / Case:	6-SMD, Gull Wing
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 110°C
Vce Saturation (Max):	500mV
Current - DC Forward (If) (Max):	60mA
Voltage - Forward (Vf) (Typ):	1.2V
Current - Output / Channel:	--
Voltage - Output (Max):	80V
Series:	--
Input Type:	DC
Rise / Fall Time (Typ):	--
Turn On / Turn Off Time (Typ):	3µs, 3µs
Current Transfer Ratio (Max):	--
Current Transfer Ratio (Min):	10% @ 10mA
Voltage - Isolation:	5000Vrms
Number of Channels:	1
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Optoisolators are often seen as devices that require little in the way of application, as they are largely just functional components that can be stepped up to suit a task. However, with the specifics of the 4N28S1(TB) optoisolator, a more thorough understanding of the application field and working principle is necessary to ensure maximum efficiency. This optoisolator is a style of Transistor Photovoltaic Output (T/O or TO) optoisolator, providing electrical insulation between two separate circuits in the process.The 4N28S1(TB) optoisolator isolates a power line from any control or feedback signals that are supplied on the same line. This is particularly useful for circuits that must remain isolated from any external interference, such as medical circuits or circuits otherwise used in TV or radio. The increased protection that the optoisolator provides reduces the risk of corrupt signals, interference or accidental short circuits, providing a greater degree of safety to the overall system.The working principle of the 4N28S1(TB) optoisolator is relatively simple. An LED light source is used to produce light within the optoisolator\'s sealed body, which is then focused onto a silicon photo-transistor. The current passing through the LED is monitored within the device, and this is used to control both the voltage and current of the silicon photo-transistor. Any signal changes in the LED current can then be detected by the silicon photo-transistor\'s output. This in turn produces an electrical potential that is passed from the optoisolator\'s input side to its output, in order to provide electrical insulation between the two throughout the process.In terms of usage, the 4N28S1(TB) optoisolator can be used to switch relays and to multiplex inputs and outputs. Additionally, they can be used in a number of other applications in which a controlled current or voltage has to be separated from a source. Not only this, but the optoisolator\'s ability to shield from interfering signals makes it ideal for use in areas such as medical applications, which require a high degree of insulation and safety.Overall, the 4N28S1(TB) optoisolator is a useful device for applications that require a controlled flow of current and/or voltage, as well as those that require a high degree of isolation from external sources. The working principle of the optoisolator involves an LED light source which is then detected by a silicon photo-transistor. This then produces an electrical potential and in turn provides electrical insulation between the two circuits that are connected. As a result, it is considered to be a suitable device for a variety of applications where it is necessary to have a dependable degree of insulation from other external sources.

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