Substitute for 2N3053

[Joe P]

Hi,

I've got a simple circuit with a 555 timer flashing some LEDs. The
circuit diagram is at:
http://ourworld.compuserve.com/homepages/Bill_Bowden/555.htm#555leds.gif
It uses two transistors, a 2N2905 and a 2N3053. I have located a source
for the 2N2905, but cannot find a 2N3053. Can anyone suggest any
suitable sustitutes for the 2N3053 in this context?

Thanks in advance.

Joe.

 

[guy pastuzak]

It uses two transistors, a 2N2905 and a 2N3053. I have located a source
for the 2N2905, but cannot find a 2N3053. Can anyone suggest any
suitable sustitutes for the 2N3053 in this context?

Hi
It's not critical. Works at saturation or blocage. Depending of the color of
LEDs, should be 300mA or less, with base current 20mA.
TO18 case should be suffisant. Maybe 2N2222 in metal case TO18

 

[Watson A.Name - \Watt Sun, the Dark Remover\]

Hi,

I've got a simple circuit with a 555 timer flashing some LEDs. The
circuit diagram is at:
http://ourworld.compuserve.com/homepages/Bill_Bowden/555.htm#555leds.gif
It uses two transistors, a 2N2905 and a 2N3053. I have located a source
for the 2N2905, but cannot find a 2N3053. Can anyone suggest any
suitable sustitutes for the 2N3053 in this context?

You can use a transistor in a TO-126 or TO-220 package, such as the
TIP31. What you want is the current handling ability and the power
dissipation. You could use the BD135, for instance. For more info and
prices, see http://www.futurlec.com/TransPowerBD.shtml

But as far as I know, the 2N3053 is available at Rat Shack, as the
276-2030, for a couple bucks. And at many other places on the net and
in stores. The NTE128 (the metal cased one, _not_ the plastic) is the
direct sub for it. See www.nteinc.com.

 

[Watson A.Name - \Watt Sun, the Dark Remover\]

Hi
It's not critical. Works at saturation or blocage. Depending of the color of
LEDs, should be 300mA or less, with base current 20mA.
TO18 case should be suffisant. Maybe 2N2222 in metal case TO18

The whole idea is to get the power handling capability, and the TO-18
transistors don't have that much. If you want to use one of that
series, use the 2N2219, which has a lot more power handling than the
2N2222.

BTW, the 2N2222 is just about extinct, you can get the 2N2222A, but even
that's getting more difficult to find.

 

[Joe P]

Thanks guys for your help. I've located a 2N2219 and so I'm going to try
that one.