ELM3053(TA)

Current - On State (It (RMS)) (Max):	70mA
Approvals:	DEMKO, FIMKO, NEMKO, SEMKO, UL
Supplier Device Package:	4-SOP
Package / Case:	4-SMD, Gull Wing
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 110°C
Current - DC Forward (If) (Max):	60mA
Voltage - Forward (Vf) (Typ):	1.2V
Turn On Time:	100µs (Max)
Current - Hold (Ih):	5mA
Series:	--
Current - LED Trigger (Ift) (Max):	5mA
Static dV/dt (Min):	1kV/µs
Voltage - Off State:	600V
Voltage - Isolation:	3750Vrms
Number of Channels:	1
Zero Crossing Circuit:	No
Output Type:	Triac
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Optoisolators - Triac, SCR Output

Optoisolators offer the advantage of electrical insulation between the input and the output of a system, and the ELM3053TA is no exception. This opto device combines an LED and a Triac or SCR output, allowing it to provide electrical isolation and also work as a managed current source.When speaking about the application of this particular opto device it is its applications as switchable current sources that stand out the most. An important feature is that the current output can be switched with galvanic isolation between the control signal and the current load – this makes it ideal for a variety of switching control purposes. For example, the ELM3053TA optoisolator can be used to switch different coils, motors and other inductive loads. It also excels at switching circuits with leakage currents, as it does not short-circuit them.In regards to its working principle, this opto device relies on the classic AC/DC bridge circuit. This is the same circuit commonly employed for the control of AC loads such as motors and solenoids. It is basically a circuit that uses four switches connected in a square.In the case of the ELM3053TA, the LED and the Triac or SCR output on the same chip are the two inputs. The LED emits a light signal into the photographic controller, which in turn should control the conduction of the switching element. This opto device is attractive for its simplicity - since there are no components outside of the package other than the resistor and the capacitors needed, it is much easier to integrate into existing circuit designs.On top of that, these resilient opto switches also boast high immunity against shocks and vibrations – making them ideal for controlling devices that require reliable operation without compromising usage safety. Moreover, the ac current supplied to the opto device comes from the AC supply line, with the control voltage/pulse supplied from a separate DC source. This offers improved control over current loads and system reliabiliy. However, this type of opto-isolators also has certain drawbacks. One of the main limitations is that the LED output cannot be adjusted in the circuit – it needs to be matched to the supply voltage, otherwise the photo-controller may not turn the SCR or Triac on and off properly.Furthermore, the total voltage drop across the LED is also an issue. When the led is forward biased there is a certain amount of voltage that is eliminated from the line, which affects the overall power of the system. This can be problematic when the system load must be managed carefully.All in all, the ELM3053TA optoisolator can provide great advantage when it comes to switchable current sources. Easy to integrate into existing circuit designs, the opto device offers improved control over current loads and system reliability. However, users should consider the limitations mentioned in this article before deciding to incorporate the opto device into their design.

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