Hi,
I'm searching for transistor types equivalent roughly to BC546 (300MHz, 300Hfe, 50Vce) but in a TO126 case instead of TO92, so that they can dissipate a bit more power.
Anybody has a suggestion?
Jan
I'm searching for transistor types equivalent roughly to BC546 (300MHz, 300Hfe, 50Vce) but in a TO126 case instead of TO92, so that they can dissipate a bit more power.
Anybody has a suggestion?
Jan
You could simply buy fakes in a TO126.
This example is just what you are looking for, except the Ft which is too low, but I have tested other similar samples that had a high Ft, higher even than the BC:
http://www.diyaudio.com/forums/solid-state/189599-my-little-cheap-circlophone-77.html#post2943313
This example is just what you are looking for, except the Ft which is too low, but I have tested other similar samples that had a high Ft, higher even than the BC:
http://www.diyaudio.com/forums/solid-state/189599-my-little-cheap-circlophone-77.html#post2943313
Sanyo C39** series in the F-rating, C3951 to C3956, and higher fT types as e.g. a 500MHz C3599.
Some Panasonic TO126 types get close to those figures.
(both can still be found for 50-75 €cents/pc with a little search)
The BDs have relatively low Hfe. SMD would be OK I guess - I was looking at Zetex (now Diode), not successful so far.
Jan
On several occasions I have rooted through data sheets looking for transistors such as you described. With the demise of CRT displays it seems like all the candidates have been discontinued. In particular you can't find anything with the speed of the BC54X/BC55X series. Which characteristics of the BC546 are essential, and which can be negotiated?
The KSA1381E/KSC3503D (Fairchild) have about half the gain, and an octave lower on Ft, than the BC546. Although they are supposedly complements, it doesn't look like Fairchild is manufacturing them in corresponding Hfe rankings. I think they are the lowest capacitance devices I've seen in TO-126.
The KSA1220/KSC2690 (Fairchild) are slightly lower gain, an octave lower on Ft, and much higher collector capacitance than the BC546.
The 2SD1683/2SB1143 (On Semiconductor) are similar to the KSA1220/KSC2690 except higher capacitance; the 2SA1507/2SC3902 have lower Ft.
The KSC2316/KSA916 (Fairchild) come in an extended TO-92 package, providing about 50% more dissipation with the same physical footprint as the BC546 - but the electrical specs are a bit worse than the KSA1220/KSC2690.
The PZT3904/PZT3906 (Fairchild) are in the surface-mount SOT-223 package, good for a bit less than a watt. Electrical specs are comparable or better than the BC546 EXCEPT for collector voltage: 40 volts rather than 65 volts.
Dale
The KSA1381E/KSC3503D (Fairchild) have about half the gain, and an octave lower on Ft, than the BC546. Although they are supposedly complements, it doesn't look like Fairchild is manufacturing them in corresponding Hfe rankings. I think they are the lowest capacitance devices I've seen in TO-126.
The KSA1220/KSC2690 (Fairchild) are slightly lower gain, an octave lower on Ft, and much higher collector capacitance than the BC546.
The 2SD1683/2SB1143 (On Semiconductor) are similar to the KSA1220/KSC2690 except higher capacitance; the 2SA1507/2SC3902 have lower Ft.
The KSC2316/KSA916 (Fairchild) come in an extended TO-92 package, providing about 50% more dissipation with the same physical footprint as the BC546 - but the electrical specs are a bit worse than the KSA1220/KSC2690.
The PZT3904/PZT3906 (Fairchild) are in the surface-mount SOT-223 package, good for a bit less than a watt. Electrical specs are comparable or better than the BC546 EXCEPT for collector voltage: 40 volts rather than 65 volts.
Dale
Only modern production parts I know of which reach the requirements you posted are fast switching components.
e.g. 2SC2506, manufactured by Sanyo and OnSemi, comes in surface mount and through hole IPAK.
(almost ready to turn obsolete myself)
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Eeeekkk, no idea where my finger and head went off to.
Correct part number : 2SC5706 ( www.onsemi.com/pub_link/Collateral/EN6912-D.PDF )
That's it Jacco! Muchos grazias!
I'll go with these types.
Thanks all for suggestions.
Jan
.MODEL 2SC5706 NPN(IS=650.0f BF=340 NF=1 VAF=10 IKF=790.0m ISE=2.000p NE=2 BR=90 NR=1 VAR=40 IKR=780.0m ISC=350.0p NC=2 RB=780.0m IRB=100.0m RBM=35.00m RE=21.00m RC=24.00m XTB=1 EG=1.11 XTI=3 CJE=270.0p VJE=680.0m MJE=350.0m TF=350p XTF=40 VTF=20 ITF=30 PTF=0 CJC=45.00p VJC=600.0m MJC=400.0m XCJC=1 TR=50p FC=500.0m KF=0 AF=1 Vceo=100 Icrating=5.0 mfg=ON_Semi) ; Ft=360MHz typ, Hfe=200 min
2SC5566 ako:2SC5706 NPN(Vceo=100 Icrating=4.0 mfg=ON_Semi) ; Ft=360MHz typ, Hfe=200 min
Does anybody have modeling info for the 2SA2039 (or 2SA2013)?
Dale
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