2P4M is a solid state semiconductor device called Thyristor or SCR (Silicon Contr . Manufacturer: NEC Manufacturer Part No: 2P4M Package / Case: TO RoHS: Yes Datasheet: Click Here Specifications Current Rating: 2A SCR Type: Single. FEATURES: 2A (4 Ar.m.s) Thyristor Easy installation by TOAA package Less holding current distribution provides free application design.

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How to use 2P4M SCR First understanding the working let us consider a simple application circuit for the device as shown in the circuit diagram below.

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So until the button B1 is pressed again the load voltage will be zero. As show in graph once the button B2 is pressed the voltage across the load will become zero due to the loop break and the device will start recovering.

Once this button is pressed the circuit loop will break and current flow though the device will become zero. In addition Button 2 will be close by default and will break the circuit once it is pressed.


This is due to the characteristics of the device as a SCR. So when B1 is pressed at a time T1 as shown in graph, SCR starts conducting and a voltage appears across the load as shown in the graph.


Also in circuit, device Anode is connected to load and cathode is connected to second end of power source. Here V1 is the DC voltage source, a resistor type load is connected in series with SCR and Vg is the trigger voltage at the gate of the device. Submitted by admin on 24 November This way we have used the SCR as a switching device and in a similar way we can use in other applications. So under no trigger to the gate of the SCR i.

After button B2 is released the device will again block the forward DC voltage and will wait for the gate pulse. The device is designed to have highly sensitive trigger levels and is suitable for applications where available gate currents are limited. Since the power supply is DC the Sccr which was triggered ON will stay in conduction mode even after the gate voltage is removed after the device starts conducting. First understanding the working let us consider a simple application circuit for the device as shown in the ecr diagram below.


TL — Programmable Reference Voltage. Once the current is cutoff the charge stored in the device will dissipate and it will recover to its initial forward blocking state. And to drop the current through the loop to zero we will press button B2.

As shown in graph the voltage appears across load after second trigger and this cycle of triggering and breaking 2p4j.

Now for recovering the SCR to its high resistance state the current flow though the device must be brought to zero for fraction of second. This state continuous until a voltage pulse is give to the gate of the device and this is possible when button B1 is pressed.

At initial state button B1 will be not pressed and in gate voltage absence SCR will be in non-conductive state.