2P4M is a solid-state semiconductor device known as Thyristoror SCR(Silicon Controlled Rectifier). This device is specifically designed to feature highly sensitive trigger levels , and is suitable for use in situations where the available gate currents are restricted.
2P4M is a 3-pin device as seen in the diagram of 2P4M pins and we’ll describe each pin below.
|1||Cathode||Connected to neutral|
|2||Gate||A low voltage trigger pulse is sent to this pin for turn on the SCR.|
|3||Anode||Connected to Load|
2P4M Electrical and Features
- Simple installation thanks to its small size and its thin electrode leads
- Low cost
- Less holding current distribution provides free application design
- Peak reverse blocking voltage: 500V
- Peak on-state current: 2A
- Current at the gate’s peak: 0.2A
- Peak gate reverse voltage: 6V
- Operating junction temperatures from -40oC to +125oC
- The temperature of the storage container is ranging from -55oC up to +150oC
2P4M Equivalent SCR
SN102, TIC206D, BT169, TYN604, 2N1596, 2N1595
2P4M SCR Overview
2P4M is used for applications where currents of the gate are restricted, like spark ignitions with capacitive discharge the control of motors within kitchen appliances and over voltage protection for low power supply. It can also be used for low-voltage AC rectifier, as well as RMS voltage control applications.
How to use 2P4M SCR
To begin understanding the operation, let’s look at an easy application circuit to the device, as illustrated in the diagram of circuit below. In this circuit, V1 is the source of DC voltage and a resistor-type load can be connected to SCR. Vg is the voltage that triggers its gate. Additionally, Button 2 will be close by default and cut off the circuit when it is activated. In addition, in the circuit the device anode is connected to the load, and cathode to the second end of power source.
At the beginning of the state, B1 will not be activated and in the event of absence of gate voltage SCR will be in a non-conductive state. Therefore, if there is no trigger for any gate on the SCR (i.e. Vg = 0V) then the complete drop is visible across the device, and we are in the position of having Vload = 0V, as seen in the graph. The state continues until a pulse of voltage is delivered to the device’s gate and this can happen when B1 button is pressed.
If B1 is activated at a specific time, T1 as depicted in the chart, SCR starts conducting and it is observed that a voltage is generated across the load as illustrated on the diagram. Because the power source can be described as DC the SCR that was turned on will remain in conduction mode until the gate voltage has been removed when the device begins conducting. It is because of the nature of the device as an SCR.
In order to restore your SCR in its state of high-resistance, the current flowing through the device needs to be cut off to a stop for a fraction of a seconds. When the current has been cut off, the charge that is stored inside the device will evaporate and it will return back to its original forward blocking state. In order to reduce the current that flows through the loop to zero , we need to press B2. When this button is pressed, the circuit loop will be broken and the current flowing through the device will drop to zero. In the graph, once the button B2 has been pressed, that voltage will be zero because of the loop breaking, which will cause the device to begin recuperating.
Once button B2 has been released the device will prevent any forward DC voltage, and then be waiting for the gate signal. Therefore, until button B1 is released again, the voltage across load will remain null. In the graph, the voltage will be visible across the load after the second trigger, and the cycle of triggering and then breaking is continuous.
This is how we have utilized the SCR to switch devices and in a similar manner we could use it for other purposes.