NJW3281 NJW1302 Sustained Beta from OnSemi - diyAudio
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Old 17th December 2007, 04:09 PM   #1
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Default NJW3281 NJW1302 Sustained Beta from OnSemi

anyone have a chance to compare this -- seems that they were introduced in September but I didn't see a press release:

http://www.onsemi.com/pub/Collateral/NJW3281-D.PDF
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Old 19th December 2007, 03:29 AM   #2
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I just received an e-mail from the product line manager at On Semi. Here's what he had to say about these parts:

"Our roadmap for the coming year is centered on the TO-3P package we are getting ready to introduce. This portfolio of devices uses the same die as our TO-264 parts. The lower cost TO-3P package will hopefully allow us to capture more of the cost competitive mid-range consumer business without sacrificing performance"
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Old 20th December 2007, 12:43 AM   #3
Leolabs is offline Leolabs  Malaysia
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Quote:
"The lower cost TO-3P package will hopefully allow us to capture more of the cost competitive mid-range consumer business without sacrificing performance"
"Without sacrificing performance",how???
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Old 20th December 2007, 01:08 AM   #4
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Quote:
Originally posted by Leolabs


"Without sacrificing performance",how???
Ain't no metal can (TO-3) -- just the plastic case -- seems that there are some other things at work, however. Steel ain't so cheap anymore.

I like TO-3, just becuz I rebuild amplifiers and the holes are already there.
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Old 20th December 2007, 04:25 AM   #5
CBS240 is offline CBS240  United States
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Still comes up a bit short on SOA when compared to a typical mosfet device such as 'this' with the same case style. Over 30V with 10A DC from a plastic TO3P
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Old 20th December 2007, 04:50 AM   #6
taj is offline taj
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I'm a bit confused. What's the difference between the MJW (1302/3281) and NJW series? Just TO-247 vs. TO-3P? I don't see much difference between the two in terms of physical footprint. Is there an electrical difference?

Obviously the NJW is smaller than the MJL series TO-264 package, but doesn't the MJW series already provide the size advantage they're after?

Or is there more to it than I'm seeing?

..Todd
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Old 20th December 2007, 01:12 PM   #7
KSTR is offline KSTR  Germany
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OnSemi case codes:

NJW: TO3P
MJ: TO3
MJD: DPAK4
MJE: TO220/225
MJF: TO220-ISO
MJL: TO264
MJW: TO247
NJL: TO264-5 (with integrated t-comp diodes)

An effective difference in parameters other than Vcbo/Vceo seems to be in the 0302 vs 1302 (0281 vs 3281, resp) varietes, the "0"-version are smaller die (less Pd) and have less capacitance. For same number devices vs. case style (NJW, MJL, MJW) I see no significant differences (besides Vcbo/Vceo)

- Klaus
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Old 21st December 2007, 01:59 PM   #8
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Did anyone else notice that the Rth(j-c), power dissipation, thermal derating and maximum power dissipation don't add upp for many of the ONSemi plastic parts? (MJL21193, MJL3281...)

Rth(j-c) is stated as 0.7K/W and thermal derating as 1.43W/K. This would suggest a power rating of 180W. Or a typo as this is the same values as stated for the 250W metal cans.

Strange is that the mjw3281a datasheet says 0.625K/W (this works out to 200W) but the MJL3281 in the bigger TO264 says 0.7K/W. I have a hard time believing that the smaller package has better thermal properties...

I wonder too what is the advantage of TO3-P vs. TO247. Maybe it is cheaper in some way. Or maybe it's just the japanese transistor looks they are after :P
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Old 21st September 2008, 10:56 AM   #9
K-amps is offline K-amps  United States
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Default MJW vs NJW

250vce vs 230vce and also better hfe across most of the load spectra.... At a $1.48 a pop at Digkey... I ain't complaining. Sustained beta's for me!
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Old 21st September 2008, 11:07 AM   #10
AndrewT is offline AndrewT  Scotland
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I thought To3p was a generic title for all large plastic packages.
Now, it seems that ONsemi are saying that To3p is different from To247 and different from To264.

What exactly is To3p?
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