2N6059 obsolete

rote:

n in a TO-3 pack) has gone obsolete. There's a few hundred at newark, I to ld him to grab ~100. But is there another 'favorite' npn darlington in a t o-3? I could stand something with less current/ power (4-5 amps is plenty. )

else. NTE will be making the NTE247 forever, same part.

e it out for serious prototypes or designs. OTOH, 2N3055 are available fro m D, M, and eBay for a $1. If you search more carefully, you can get them for 50 cents. 2N3055 are forever.

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

ton 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 plent y.)

g else. NTE will be making the NTE247 forever, same part.

ule it out for serious prototypes or designs. OTOH, 2N3055 are available f rom D, M, and eBay for a $1. If you search more carefully, you can get the m for 50 cents. 2N3055 are forever.

tributes NTE. NTE is aftermarket, so it costs, but it's still way cheaper t han 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.

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?

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.

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there are darlintons in to220, something like tip121

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

-Lasse

the little Darling (the first stage) and just use the standard work horse T O-3 (i think everybody know that one!).

to redo it. (The pcb is on an old winboard program...now defunct. I'd hav e to redo the whole thing.)

d be enough space to add a tiny SMT first stage transistor. I have to look around, but i think even a SOT-23 might be enough. You should be able to rework it from Gerber files, rather than the original program.

ton.. I guess. Well we'll buy 100 and put it off for several years.

You are probably too young to know 2N3055 projects.

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

-Lasse

ngton 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 ple nty.)

ing else. NTE will be making the NTE247 forever, same part.

rule it out for serious prototypes or designs. OTOH, 2N3055 are available from D, M, and eBay for a $1. If you search more carefully, you can get t hem for 50 cents. 2N3055 are forever.

istributes NTE. NTE is aftermarket, so it costs, but it's still way cheaper than keeping unused inventory, or any of your insane ideas.

/dp/06M7400

The $7.25 for the drop-in is ultimately cheaper than rigging up your two-tr ansistor 2N3055 combo, BY A LOT! And this doesn't even consider that the 2N

2222 is a 40V to 75V device. You do understand the collectors are tied toge ther in Darlington, so why tie a 40V to a 100V device.

On Tuesday, November 5, 2013 3:12:40 PM UTC-8, snipped-for-privacy@gmail.com wro te:

:

lington 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 p lenty.)

thing else. NTE will be making the NTE247 forever, same part.

ch rule it out for serious prototypes or designs. OTOH, 2N3055 are availab le from D, M, and eBay for a $1. If you search more carefully, you can get them for 50 cents. 2N3055 are forever.

distributes NTE. NTE is aftermarket, so it costs, but it's still way cheap er than keeping unused inventory, or any of your insane ideas.

0v/dp/06M7400

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 to gether in Darlington, so why tie a 40V to a 100V device.

It depends. For around $5 to rework each. 100+ ($500) would be possible to set t up. Once you have the setup, probably around $1 or $2 each addition al. 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 migh t work, depends on the gain and current requirements. There are tons of tr ansistors in between.

"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:

Cheap enough too.

... Phil

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.

a m I

Excellent! Thanks Phil, I think mostly I'd like to know what npn darlingto ns will 'be around forever'. Nothing wrong with cheap either.

Lasse found another more expensive replacement. This is used in a linear c urrent 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 a t mid power dissipated in the pass element. (But it could be worse.)

George H.

You did not read my post.

Perhaps they were all made in the 70s and just finishing up the over-stock clearance. Since i refused to buy them, it took a few decades for them to sell out.

** FFS wanker - YOU did not read mine.

That link only shows that ST have stopped making any.

.... Phil

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.

This was a different thing: 150 A current regulator for an adiabatic demagnetization cooler magnet (ultra-cool, below 1K).

--

Tauno Voipio

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.

n..

A

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

Anyway, it's easy enough to pre-test the components for acceptable betas (g ain) before hooking them together. I have used 2222 + 3055 without the res istors. Unfortunately, it's difficult to found metal can 2222 nowaday. Th e 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.

at impressive. There has got to be something out there that would make retr ofitting a driver to make a Darlington unnecessary.

I assume you mean the 3055. To handle the high current (15A) and power (10

0W), the device has to be big and simple. Putting the little Darling (firs t stage) inside also reduce the power rating, since it becomes the weaker p oint. Most Darlingtons are 10A and less than 100W.

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