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Old 9th March 2009, 06:58 PM   #1
kf_tam is offline kf_tam  Hong Kong
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Default Reliable source of 2SC3953??

Dear sir,
I have some seemingly genuine Sanyo 2SA1538E and now I am searching for its NPN counterpart 2SC3953. Locally only RS carries it but this is from Magnatec . I tried to buy on xBAY, but I got faked ones (tested to be PNP transistors with a lowly Hfe=50) and has to returned them to the seller.

I see Newark sells this transistor too, sourcing from MCM. In fact, MCM sells two versions ($1.2/pc and $3.85/pc) but the pricer one is back-ordered. Is the cheaper one faked or not genuine part (such as Magnatec)?

If anyone knows a reliable source that selling worldwide, I am all ears.

Thank you so much,
Edward Tam
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Old 18th March 2009, 12:04 PM   #2
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Fairchild has an authentic second-sourced device, ksc3953 - the beta is fairly low at ~60, but the batch variation is very small. I have no idea where stocks are available, unfortunately. If you have a SPICE model for this device, please post it here.
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Old 24th March 2009, 07:29 PM   #3
kf_tam is offline kf_tam  Hong Kong
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I have gotten quote from some online obsolete part supplier, and finally order 100pcs of 2SC3953E from Component Electronics Inc. in Canada for US$0.8/pcs. I knew nothing about their service/reliability before and just bit the bullet.

Today, the package finally showed up (after being opened and checked by local custom). I have tested two pieces, all NPN and hfe are 136 and 148, safely within the E classification.

linuxguru: sorry, don't have anything about spice
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Old 28th January 2011, 10:24 AM   #4
Telstar is offline Telstar  Italy
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bumping for spice models.
these devices seem VERY interesting for my application.
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"The total harmonic distortion is not a measure of the degree of distastefulness to the listener and it is recommended that its use should be discontinued." D. Masa, 1938
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Old 28th January 2011, 10:41 AM   #5
Telstar is offline Telstar  Italy
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Mouser lists these as replacement:
NTE2508 (NPN) & NTE2509 (PNP)
http://www.nteinc.com/specs/2500to2599/pdf/nte2508.pdf
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"The total harmonic distortion is not a measure of the degree of distastefulness to the listener and it is recommended that its use should be discontinued." D. Masa, 1938
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Old 17th October 2011, 12:08 PM   #6
Salas is online now Salas  Greece
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Quote:
Originally Posted by Telstar View Post
bumping for spice models.
these devices seem VERY interesting for my application.
* 2SC3953 - SANYO published model 2004/02/19
.MODEL 2SC3953 npn
+ IS=5.80f
+ BF=96.0
+ NF=0.98
+ VAF=23.0
+ IKF=190.0m
+ ISE=70.0f
+ NE=1.50
+ BR=1.40
+ NR=1.00
+ VAR=38.0
+ IKR=20.0
+ ISC=10.0f
+ NC=1.50
+ RB=360.0m
+ IRB=1.00
+ RBM=80.0m
+ RE=60.0m
+ RC=180.0m
+ XTB=0
+ XTI=3
+ EG=1.11
+ NK=0.68

* 2SA1538 - SANYO published model 2004/02/19
.MODEL 2SA1538 pnp
+ IS=10.2f
+ BF=140.0
+ NF=0.98
+ VAF=15.0
+ IKF=160.0m
+ ISE=30.0f
+ NE=1.36
+ BR=0.38
+ NR=1.00
+ VAR=60.0
+ IKR=2.00
+ ISC=20.0f
+ NC=1.80
+ RB=180.0m
+ IRB=1.00
+ RBM=180.0m
+ RE=40.0m
+ RC=190.0m
+ XTB=0
+ XTI=3
+ EG=1.11
+ NK=0.82
Attached Files
File Type: pdf C3953_spice_params.pdf (12.8 KB, 25 views)
File Type: pdf A1538_spice_params.pdf (12.8 KB, 11 views)
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