MJ21195/93 and MJ21194/96

[WOPL Sniffer]

Joe, we have been using the Mj21195 and the Mj21196 for out WOPL builds. There has been some issues getting these at times and I was looking at the specs for the Mj21193 and the Mj21194's and it appears that they have the same specs. What does your experience tell you? The 93's and 94's have been available. And, a couple buck cheaper by the time you fill a back plane.

 

[laatsch55]

Less SOA than the 95/96's...

 

[WOPL Sniffer]

The maximum Ratings are the same for all 4

 

[WOPL Sniffer]

I'm looking at the Data sheets and it shows no differences. The SOA's are derived from the Temps at max current (below) and all 4 are the same

Operating and Storage Junction Temperature Range TJ, Tstg −65 to +200 C

Safe operating area curves indicate IC − VCE limits of the transistor that must be observed for reliable operation;

 

[WOPL Sniffer]

Matter of fact, some curves for the 93's and 94's are better, and in some, the 95's and 96's.

IF the SOA is wider, it is not very much wider. And if that's at MAX, it may not come into play

 

[WOPL Sniffer]

Maybe if you were matching transistors for use at the back plane but I don't see that difference. Joe may be able to help me out here.

 

[laatsch55]

We had discussed this in the past...

 

[Gepetto]

33% better SOA on the 96 vs the 94 at 250V, 1 sec. 0.6A/1sec for the 96, 0.45A/1sec for the 94.

SOA is the reason. Larger die in the 95/96 transistors makes them more rugged.

For a long time, the 93/94s were considerably more expensive than the 95/96 pairs. Now virtually the same.

 

[WOPL Sniffer]

I'll have to scratch my head at the 150ma....... When they are rated for 16 amps, what's 150 ma between friends??? Maybe I'll build a mule and test the 93's and 94's

 

[Gepetto]

I'll have to scratch my head at the 150ma....... When they are rated for 16 amps, what's 150 ma between friends??? Maybe I'll build a mule and test the 93's and 94's

Perry they are only rated for 16A at 15V across the Vce, after that you follow the SOA curve for operating conditions. Most all 700s have 100V or more across them even sitting near idle.

Each is good for 2-3A under these conditions.

 

[WOPL Sniffer]

roger that. I see the slight difference on the curve.

 

[Gepetto]

Don't get me wrong guys, the MJ21193/94s are fine transistors. But this crew is always going all out and right now the MJ21195/96 complements are the best bipolar TO-3 transistors being made. Getting to be a dying breed however, hopefully ON Semi keeps making them for a long, long time.

The MJ21193/94 are listed as a preferred device for ON Semi. This means they make more profit on each one so they always hold stocking positions on the 93/94. Not so on the 95/96. I think they have noticed that communities such as ours use a lot of these devices.

When they run batches, they sell out almost immediately.

 

[WOPL Sniffer]

Good info Joe. Sometimes I need to check the skeletons in the closet.... And besides that, I'm old and forget shit. Like the time I took a break and forgot how to build a WOPL. It took me almost 5 days to build it.... WTF?

 

[wattsabundant]

Joe, you're certain the die is larger on 26"s? I wouldnt be surprised if they are all the same, but some production runs grade a little better. The ones that don't grade out for 26's become 24's. At my day job, we get 300amp diodes spec'd at 200V, 400v, 800v and 1200v. They all come in at 1200V better. It seems the vendor makes 1500V devices and stamps whatever P/N on it that we order. Testing the voltage rating of a diode is easy. I'm not sure how SOA could be graded on a production run.

 

[WOPL Sniffer]

Joe, you're certain the die is larger on 26"s? I wouldnt be surprised if they are all the same, but some production runs grade a little better. The ones that don't grade out for 26's become 24's. At my day job, we get 300amp diodes spec'd at 200V, 400v, 800v and 1200v. They all come in at 1200V better. It seems the vendor makes 1500V devices and stamps whatever P/N on it that we order. Testing the voltage rating of a diode is easy. I'm not sure how SOA could be graded on a production run.

What are 26's???

 

[wattsabundant]

What are 26's???

My bad. Should be 96

 

[Gepetto]

We'll find out Don...

 

[FredR]

Just laid in a supply of one hundred each 95/96. You guys got me paranoid.

 

[WOPL Sniffer]

Can't go wrong there Fred. Expensive but necessary. It would be MY luck that I'd buy a couple hundred each and then the price would go down a week after I bought them.

 

[grapplesaw]

I bought 300 last year. Best bet I’ve made with these things. Joe still has a great offering. I ordered 40 from him last month