MJ21193/MJ21194 (MJ 21193 21194) - no data for SOA during dc conditios - diyAudio
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Old 27th August 2009, 10:13 AM   #1
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Default MJ21193/MJ21194 (MJ 21193 21194) - no data for SOA during dc conditios

There is only the condition for 1 sec, but not for DC in the SOA diagram (please refer fig. 13, page 4) about
http://www.onsemi.com/pub_link/Collateral/MJ21193-D.PDF
In the SOA-diagram of the datasheet MJ15015/15016/2N3055A
there are different conditions (for 30us,100us, 1ms and 100ms) so as DC condition (please refer fig. 12 and fig. 13, page 5
http://www.onsemi.com/pub_link/Collateral/2N3055A-D.PDF

Are there certainly calculation steps to determine self the dc conditions for MJ21193/MJ21194 SOA?
Thank you very much for your advices
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Old 27th August 2009, 02:39 PM   #2
wg_ski is offline wg_ski  United States
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The DC curve can always be generated for any device. In this case 250W at T=25C derating to zero at 200C. They usually put the 25C DC curve on the SOA graph for reference (MJ15015, etc.) but they don't have to because they've already supplied that information.
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Old 2nd September 2009, 05:20 PM   #3
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Here I have both SOA Diagrams MJ21193 and MJ15025 from
http://www.onsemi.com/PowerSolutions....do?id=MJ15025
for directly compare, but I understand only this one from MJ15025
Attached Files
File Type: pdf MJ21193-MJ15025 SOA pdf.pdf (26.0 KB, 72 views)
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Old 4th September 2009, 11:57 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi T,

For Tc=25degC,
I see a current limit that matches the specification.
I see a power limit that matches the specification.
I see a plot of second breakdown that is not described in the specification.
Those SOA graphs seem to give all the information I need without any ambiguity.

What is the problem?
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Old 4th September 2009, 12:36 PM   #5
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The problem is, that I have only the SOA for 1 sec and I want to understand, how I can generrated other times and dc conditions for directly compare to the other mentioned power devices.
Additional it would be of interest for me, why the SOA for MJ21194 is only for one second and this one for the older MJ types a wide range of different times for SOA (open the weblink in the beginning of this thread)

Additionaly I don't understand the follow:
=======================================
"The DC curve can always be generated for any device. In this case 250W at T=25C derating to zero at 200C. They usually put the 25C DC curve on the SOA graph for reference (MJ15015, etc.) but they don't have to because they've already supplied that information."
=======================================

what means this exactly concerning the comparable of SOA with different conditions for each types?
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Old 4th September 2009, 01:01 PM   #6
AndrewT is offline AndrewT  Scotland
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you cannot infer the shorter single shot durations from the DC or 1second ratings.
You cannot infer the second breakdown curve from the DC ratings.

You can easily find the low voltage and current ratings from the DC specification.

A 250W 17A device can pass <17A at <14.7V when Tc=25degC.
At >=14.7V the device can pass [250/Vce] amperes continuously when Vce is <= DC second breakdown limit.
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