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2N6059 obsolete

So is a 1 ohm resistor but it's not the 2N6059. Newark, among others, distributes NTE. NTE is aftermarket, so it costs, but it's still way cheaper than keeping unused inventory, or any of your insane ideas.

1 ohm resistor is not a equivalent circuit to 2N6059.
2N3055 + 2N2222 is.

BTW, i found one NTE247 on ebay for $8.
 
G

Greegor

Jan 1, 1970
0
Tinkerers and hobbyists could easily obtain
2N3055's by looking at the back of junk car radios.
For DECADES car radios all had them quite visible
on the back end mounted in a heat sink.

Is the complimentary version still around though?
 
P

Paul E Bennett

Jan 1, 1970
0
Tauno said:
Yes they did - I burned my fingwr with a 2N3055
in 1967.

Which is the same year I got to grips with them having managed to poke a
garden fork through my foot, necessitating a trip to the doctors for a
Tetanuis Booster Jab and my first glimpse of a magazine called Practical
Electronics. Built myself my first audio amp with a pair of them (then had
to trouble shoot why it didn't work first go). managed to get a nice working
amp out of it in the end and thus at 14 years of age my career decision was
set. Up until then I was going to be an Architect.

--
********************************************************************
Paul E. Bennett IEng MIET.....<email://[email protected]>
Forth based HIDECS Consultancy.............<http://www.hidecs.co.uk>
Mob: +44 (0)7811-639972
Tel: +44 (0)1235-510979
Going Forth Safely ..... EBA. www.electric-boat-association.org.uk..
********************************************************************
 
L

Lasse Langwadt Christensen

Jan 1, 1970
0
Den tirsdag den 5. november 2013 21.33.00 UTC+1 skrev Tim Wescott:
You could make a little board that soldered onto the pins of the 2N3055

and provided the "darling" little transistor. You'd need a collector

connection, but that could be provided by a lug and a flying lead.



Or, find a 3-lug terminal strip so that your "air wiring" is nice and

rugged. If you find one where the center terminal is also the mounting

lug, that'll give you your collector connection.

there are darlintons in to220, something like tip121

cut off the middle pin and it should fit in a to3 pinout


-Lasse
 
L

Lasse Langwadt Christensen

Jan 1, 1970
0
Den tirsdag den 5. november 2013 20.21.11 UTC+1 skrev [email protected]:
Since 1960s, will still be there in 2060.

a tleast random npn(maybe) transistors in to3 with a 2n3055 stamped
on top will be available at ebay or similar

-Lasse
 
1 ohm resistor is not a equivalent circuit to 2N6059.

2N3055 + 2N2222 is.



BTW, i found one NTE247 on ebay for $8.

http://www.newark.com/nte-electronics/nte247/darlington-transistor-npn-100v/dp/06M7400

The $7.25 for the drop-in is ultimately cheaper than rigging up your two-transistor 2N3055 combo, BY A LOT! And this doesn't even consider that the 2N2222 is a 40V to 75V device. You do understand the collectors are tied together in Darlington, so why tie a 40V to a 100V device.
 
http://www.newark.com/nte-electronics/nte247/darlington-transistor-npn-100v/dp/06M7400

The $7.25 for the drop-in is ultimately cheaper than rigging up your two-transistor 2N3055 combo, BY A LOT! And this doesn't even consider that the 2N2222 is a 40V to 75V device. You do understand the collectors are tied together in Darlington, so why tie a 40V to a 100V device.

It depends. For around $5 to rework each. 100+ ($500) would be possible toset t up. Once you have the setup, probably around $1 or $2 each additional. That's for bonding the additional chip and wire bonding 3 to 4 wires.

OK, i have to look harder than the 40V 1A 2N2222. The 400V 0.2A 13001 might work, depends on the gain and current requirements. There are tons of transistors in between.
 
P

Phil Allison

Jan 1, 1970
0
"George Herold"

Hi guys, Our purchasing 'guy' just told me the 2N6059 (npn Darlington in a
TO-3 pack) has gone obsolete. There's a few hundred at newark, I told him
to grab ~100. But is there another 'favorite' npn darlington in a to-3? I
could stand something with less current/ power (4-5 amps is plenty.)


** The 80V, 10A, 150W MJ3001 is still readily available:

http://cpc.farnell.com/1/1/22461-darlington-transistor-3-mj3001.html

Cheap enough too.



.... Phil
 
Hi guys, Our purchasing 'guy' just told me the 2N6059 (npn Darlington in a
TO-3 pack) has gone obsolete. There's a few hundred at newark, I told him
to grab ~100. But is there another 'favorite' npn darlington in a to-3? I
could stand something with less current/ power (4-5 amps is plenty.)

** The 80V, 10A, 150W MJ3001 is still readily available:

http://cpc.farnell.com/1/1/22461-darlington-transistor-3-mj3001.html

Cheap enough too.

Yes, good enough while it last. Digikey shows no stock. Mouser shows obsolete. Probably last available batch at farnell. Anyone using them should buy for lifetime usage now.
 
G

George Herold

Jan 1, 1970
0
"George Herold"

Hi guys, Our purchasing 'guy' just told me the 2N6059 (npn Darlington ina
TO-3 pack) has gone obsolete. There's a few hundred at newark, I told him
to grab ~100. But is there another 'favorite' npn darlington in a to-3? I
could stand something with less current/ power (4-5 amps is plenty.)


** The 80V, 10A, 150W MJ3001 is still readily available:
http://cpc.farnell.com/1/1/22461-darlington-transistor-3-mj3001.html
Cheap enough too.
Excellent! Thanks Phil, I think mostly I'd like to know what npn darlingtons will 'be around forever'. Nothing wrong with cheap either.

Lasse found another more expensive replacement. This is used in a linear current regulated power supply. (opamp, pass element) (Drives ~10 ohm coils)I like the TO-3 pack... It's not so much about the current, but the power.. I provide an external PS input.... ~100 Watt max power... so ~25 Watts at mid power dissipated in the pass element. (But it could be worse.)

George H.
 
P

Phil Allison

Jan 1, 1970
0
Yes, good enough while it last. Digikey shows no stock. Mouser shows
obsolete. Probably last available batch at farnell.

** They have 1000s available.

http://www.newark.com/multicomp/mj3001/darlington-transistor-to-3/dp/95M9056

http://uk.farnell.com/multicomp/mj3001/darlington-transistor-to-3/dp/1165911

The maker is " Multicomp" in Taiwan and they are a stock line.

http://www.farnell.com/datasheets/1662686.pdf

Semelab of the UK also make the same number.

http://products.semelab-tt.com/part...&Description=TO3 Bipolar Transistor&Start=500

Anyone using them should buy for lifetime usage now.

** I'm only advising the OP - not the whole fucking planet.



..... Phil
 
M

mike

Jan 1, 1970
0
Excellent! Thanks Phil, I think mostly I'd like to know what npn darlingtons will 'be around forever'. Nothing wrong with cheap either.

Lasse found another more expensive replacement. This is used in a linear current regulated power supply. (opamp, pass element) (Drives ~10 ohm coils) I like the TO-3 pack... It's not so much about the current, but the power. I provide an external PS input.... ~100 Watt max power... so ~25 Watts at mid power dissipated in the pass element. (But it could be worse.)

George H.
Just a reminder, in case it ain't obvious,
pay attention to safe operating area. It's easy to get blind-sided.
I've seen production lines shut down because some other user of the part
decided to substitute a part that wasn't usable in all uses.
Especially if the other designer ain't there any more.
 
T

Tauno Voipio

Jan 1, 1970
0
Wikipedia:
"The transistor is the fundamental building block of modern electronic devices, and is ubiquitous in modern electronic systems. Following its development in 1947 by John Bardeen, Walter Brattain, and William Shockley, the transistor revolutionized the field of electronics, and paved the way for smaller and cheaper radios, calculators, and computers, among other things. The transistor is on the list of IEEE milestones in electronics, and the inventors were jointly awarded the 1956 Nobel Prize in Physics for their achievement."


I burn my ears with 2N3055. They are mostly used for audio power amps and linear regulators.


This was a different thing: 150 A current regulator for
an adiabatic demagnetization cooler magnet (ultra-cool,
below 1K).
 
I guess i am dating myself. 2N3055 was available long before 2N6059.
You are probably too young to know 2N3055 projects.

While the 2N3055 is rated for Ic=15 A, the hFE is specified for Ic=4 A
to be at least 20 (typically 70), but no specification is given for
higher collector currents.

Thus, the driver must be able to supply sufficient current to the
2N3055 base.
 
While the 2N3055 is rated for Ic=15 A, the hFE is specified for Ic=4 A
to be at least 20 (typically 70), but no specification is given for
higher collector currents.

Thus, the driver must be able to supply sufficient current to the
2N3055 base.

If 40V is enough, 2N2222 (another old favorite) can supply 1A. If not, there are others that can do 100V. Actually, they probably worry about too much base current. There are two limiting resistors in most Darlingtons.

Anyway, it's easy enough to pre-test the components for acceptable betas (gain) before hooking them together. I have used 2222 + 3055 without the resistors. Unfortunately, it's difficult to found metal can 2222 nowaday. The metal can (with heat sink) is necessary to handle 1A.
 
IMO this transistor is not the bipolar grail. The ratings are just not that impressive. There has got to be something out there that would make retrofitting a driver to make a Darlington unnecessary.
 
IMO this transistor is not the bipolar grail. The ratings are just not that impressive. There has got to be something out there that would make retrofitting a driver to make a Darlington unnecessary.

I assume you mean the 3055. To handle the high current (15A) and power (100W), the device has to be big and simple. Putting the little Darling (first stage) inside also reduce the power rating, since it becomes the weaker point. Most Darlingtons are 10A and less than 100W.

Remember that this transistor is built to buffer power, not for high gain.
 
P

Phil Allison

Jan 1, 1970
0
While the 2N3055 is rated for Ic=15 A, the hFE is specified for Ic=4 A
to be at least 20 (typically 70), but no specification is given for
higher collector currents.


** Ever see a data sheet with graphs ?

http://www.onsemi.com/pub_link/Collateral/2N3055-D.PDF

The amount of base drive current needed is a function of collector current
and Vce plus chip temperature.

For a 2N3055, 1 amp drive will get 10 amps at a Vce under 1 volt.

Thus, the driver must be able to supply sufficient current to the
2N3055 base.

** FFS 1A at low voltage is a piece of cake.


.... Phil
 
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