Equiv. Parts: 2SD669, 2SB649 - Page 3 - diyAudio
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Old 15th May 2003, 08:11 PM   #21
cm961 is offline cm961  Canada
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Hey Guys,

We should start a forum for posting spice models. As for the afformentioned parts, I like Sloan's book so much I loaded up on them a few years ago.

Pete
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Old 15th May 2003, 08:40 PM   #22
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Default There is an active SPICE thread.

Maybe you can SPICE it up...

lol, anyways, people want all these models yet don't want to put them up for others.

So upload away.

P.S. Thread made by yours truely.

SPICE thread

Eternalightwithin
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Old 17th May 2003, 04:36 PM   #23
sam9 is offline sam9  United States
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Default Free Model Generator

A free DOS-based demo device model generator is available from Intuisoft www.i-t.com. You feed in as much data as you can from a datasheet and the program estimates the remainder. It will do diodes, zenners. BJT, J-FETs, and M-FETs.

This is a demo and I can't get the results to print or to be saved to an ascii file. However, you can simply write them down carefully and type them into an ascii file. They are not that long. Supossedly the program allows PrintScreen but not, appearently, in my XP setup. If I fiddle enough, I may get those glitches worked out.

Over the next couple of days I'll plug in the 2sd669/2sb649 results. I can't make any guarantee that they are accurate and you may have to add or modify the headers for your SPICE version.
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Old 17th May 2003, 05:10 PM   #24
sam9 is offline sam9  United States
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Default DRAT !! Gotta eat my words

Don't bother with the demo on www.i-t.com. It turns out that you can only enter Vceo, Vebo, and Ic. The rest such as hFE and fT are estimated somehow and the estimates are not especially close. In this case the actual datasheet values are better than the estimates by the program.
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Old 18th May 2003, 02:41 AM   #25
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Quote:
Originally posted by cm961
Hey Guys,

We should start a forum for posting spice models. As for the afformentioned parts, I like Sloan's book so much I loaded up on them a few years ago.

Pete

most SPICE models are copyright. links to spice models might be helpful, however.

and fyi, i have the '649a and '669a at www.tech-diy.com/store.htm
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Old 21st May 2003, 10:23 PM   #26
sam9 is offline sam9  United States
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Default [B]Close Fairchild Substitute[/B]

Look at www.fairchild.com. Search for KSA1220 and KSC2690. Per the data sheets they look incredibly close to the 2sd669/2sb649. In fact they look like they could be upgrades.

Bad news they seem to be unavailable from US catalog suppliers (which frustrates me as Fairchild Corp HQ in about a 30 minute drive from here!).

Good news for Rarkov: They seem to be the same as 2sa1220 and 2sc2690 available in the EU from Donberg.

Best news: you can downloadspice models from Fairchild!
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Old 24th May 2003, 03:32 AM   #27
DSummer is offline DSummer  United States
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Default B649/D669

According to the substittution handbook from Japan, B649/D669 can be replaced by A1011/C2344 or A968/C2238. If you really need the original transistors, just email me and LMK the quantity you need. May be I can help.
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Old 24th May 2003, 11:23 AM   #28
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Default DIY Spice models

Since Spice models seem not available for the 2SB649 and
2SD669 I embarked on some Spice model DIYing a while ago.
The models are based on a combination of semiconductor
physics and empirical tweaking to match the datasheets. As
far as I can see it is usually theoretically as well as practically
impossible to match Spice models closely to all relevant diagrams
for most BJTs, so these models are a compromise not matching
any diagram perfectly but neither matching any very badly. Use
at your own risk. I also attach my DIY models for the potential
replacements 2SA1837 and 2SC4793. Suggestions for
improvements of the models are welcome.

.model 2SD669 NPN (IS=5p NF=1 BF=250 ISE=5p NE=1.5 IKF=3 VAF=150 RB=1 RC=0.25 RE=0.25 TF=1.14ns CJC=50p )
.model 2SB649 PNP (IS=5p NF=1 BF=250 ISE=10p NE=1.5 IKF=3 VAF=75 RB=1 RC=0.25 RE=0.25 TF=1.14ns CJC=50p )
.model 2SC4793 NPN (IS=0.1p BF=130 NF=1 ISE=0.1p RB=1 RE=0.1 RC=0.2 VAF=500 IKF=3 TF=1.6ns CJC=100p )
.model 2SA1837 PNP (IS=0.1p BF=130 NF=1 ISE=0.1p RB=1 RE=0.1 RC=0.2 VAF=500 IKF=3 TF=2.28n CJC=150p )
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Old 24th May 2003, 01:26 PM   #29
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Default xtra parts

Hi,

I've got 2 extra pairs of 2SB649A/2SD669As which I don't think I'll be using. I'll let them go at $10/- for the 4 pieces but I've have to check the postage if anyone is interested.

ckt
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Old 24th May 2003, 02:06 PM   #30
patch is offline patch  United States
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Thumbs up better price in NJ

Jack there at tech-diy will sell those Hitachi pairs at a MUCH better price than I've found anywhere else. It was like $1.40 or $1.50 a pair. At Fry's I shamed myself by paying something like $1.60 or $1.80 each...and that was for the NEC clones...which worked fine, by the way.
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