EL1118(TB)

Output Type:	Transistor with Base
Supplier Device Package:	5-SOP
Package / Case:	6-SOIC (0.295", 7.50mm Width), 5 Leads
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 110°C
Vce Saturation (Max):	400mV
Current - DC Forward (If) (Max):	60mA
Voltage - Forward (Vf) (Typ):	1.5V (Max)
Current - Output / Channel:	50mA
Voltage - Output (Max):	80V
Series:	--
Input Type:	DC
Rise / Fall Time (Typ):	2µs, 3µs
Turn On / Turn Off Time (Typ):	4µs, 3µs
Current Transfer Ratio (Max):	260% @ 5mA
Current Transfer Ratio (Min):	130% @ 5mA
Voltage - Isolation:	5000Vrms
Number of Channels:	1
Part Status:	Active
Packaging:	Tape & Reel (TR)

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IntroductionOptoisolators are optoelectronic devices used to provide electrical insulation between two circuits. They are an effective way to protect sensitive electronic systems while still allowing communication to pass between them. The EL1118(TB) is a type of optoisolator which uses a transistor and photovoltaic output. This article will explain the application field and working principle of the EL1118(TB).Application FieldThe EL1118(TB) is primarily designed for use in automotive applications. It is used to isolate the low voltage signals from the input wiring of ignition systems and other automotive electrical systems. It provides a stable interface between the control circuitry of the automotive system and its environment, reducing the risk of electrical noise and other interferences. In addition, the EL1118(TB) can be used to protect against electromagnetic interference (EMI) generated by other equipment, such as mobile phones or radios.Working PrincipleThe working principle of the EL1118(TB) is based on combining a photovoltaic cell and a transistor. The photovoltaic cell is a light sensitive device which converts light energy into electrical energy. The photovoltaic cell is connected to the input of the EL1118(TB) and acts as the power source. When the input voltage is below its threshold, the photovoltaic cell will generate a sufficient voltage to activate the transistor.When the input voltage is above the threshold, the transistor will be turned on and will allow current to flow from the input to the output. This output current will be proportional to the input voltage, allowing a linear transfer of signals between the input and output. The current will be limited by the output current capability of the transistor, protecting the EL1118(TB) from over load and short circuit conditions.ConclusionThe EL1118(TB) is a type of optoisolator which utilizes a transistor and photovoltaic output. It is designed primarily for use in automotive applications, providing isolation between the control circuitry of the automotive system and its environment. It works by producing an output current proportional to the input voltage, and is protected from overload and short circuit conditions by the output current capability of the transistor.

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