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(PDF) 2N4444 Datasheet download

From what I have datasgeet they use pulse transformers to trig from a lower voltage to achieve simultaneous response. We need to create a additional leakage path greater that the worst leakage spec in order to balance the voltages.

PDF This gives you the basic idea, but there are other problem issues not mentioned here. Posted June 4, Sign In Sign Up. In the diagram I used a leakage for 10uA for the one and about 20uA for the other. Hey guys, I’m a new member to this forum, so I have no idea if this topic has arisen before.


Already have an account? Off my head, I cant just ramble out the way it works, but I’ll look through the schematics and the theory book tommorow at work and try to get you a more definitive answer. Let’s look at a typical hookup using two 2n444 in series. Also note that we will be generating a fair amount of heat in the balancing resistors as shown on 2n44444 wattmeter. Posted June 3, Sign up for a new account in our community.


This will cause voltage breakdown of D1, followed datashwet breakdown of D2. The problem is the leakage current that may vary from 10uA at a cold junction temperature to 2mA for a hot junction. Years ago, I read or heard of someone putting two SCR’s in series to achieve higher voltage rating.

I have a project coming up where I need to hold off about volts using an SCR.

Register a new account. A single device with this type of holdoff is really expensive, so I’m looking for datashest alternative solution. Sign in Already have an account?

2N4444 – SCR, V(DRM) = 600V TO 699.9V

Posted June 6, Anyone out there with any experience in this application??? Power Electronics Search In.

We want to use datasjeet in a V application. Create an account or sign in to comment You need to be a member in order to leave a comment Create an account Sign up for a new account in our community.

2N Datasheet(PDF) – Motorola, Inc

2n4444 can see that D1 with the lowest leakage will have more than its rated V over it. You need to be a member in order to leave a comment. We connect it as shown in the first diagram, but find that the load turns on when we connect the power, even with no trigger applied.


Look at this AP-note http: If we take 3mA to be very safe, the voltages balance out but we have to live with the high leakage current through the load, which may be a problem for the application.

Share this post Link to post Share on other sites. By stanyJune 3, in Power Electronics.