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You need to be a member in order to leave a comment. Years ago, I read or heard of someone putting two SCR’s in series to achieve higher voltage rating. PDF This gives you the basic idea, but there are other problem issues not mentioned here.

2N datasheet & applicatoin notes – Datasheet Archive

The problem is the leakage current that may vary from 10uA at a cold junction temperature to 2mA for a hot junction. Create an account or sign in to comment You need to be a member in order to leave a comment Create an account Sign daatasheet for a new account in our community. Register a new account. Sign in Already have an account?

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Hey guys, I’m a new member to this forum, so I have no idea dataxheet this topic has arisen before. This will cause voltage breakdown of D1, followed by breakdown of D2.

2N4444 – SCR, V(DRM) = 600V TO 699.9V

Sign In Sign Up. 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 2N’s in series. Sign up for a new account in our community.

From what I have seen 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. I have a project coming up where I need daatasheet hold off about volts using an SCR.

By stanyJune 3, in Power Electronics. A single device 2n44444 this type of holdoff is really expensive, so I’m looking for an alternative solution.

We can see that D1 with the lowest leakage will have more than its rated V over it. Share dataasheet post Link to post Share on other sites. Also note that we will be generating a fair amount of heat in the balancing resistors as shown on the wattmeter.

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Posted June 6, In the diagram I used datasheeet leakage for 10uA for the one and about 20uA for the other. Anyone out there with any experience in this application??? 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. Power Electronics Search In.

Already have an account? Look at this AP-note http: 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 2n444. We want to use it in a V application. Posted June 3, Posted June 4,