102 Transistor
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  1. #1
    NECO Member DesertNeco's Avatar
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    102 Transistor

    I bought a 102 transistor from Radio shack the other day and it looks awfully small compared to the old one. I was just wondering if I picked up the right one, I dont want to put it all back in with something wrong and have it fry the IMRC all together. RadioShack.com - Cables, Parts & Connectors: Component parts: Transistors & analog ICs: MPF102 Transistors

    Or the part number #276-2062

    If thats not the one can someone link me the right one. Thanks Im about to solder it and waiting haha.

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  3. #2
    NECO Member DesertNeco's Avatar
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    Re: 102 Transistor

    Well I was looking at it closer and Im pretty sure its not right. I mean it only has a 25v bridge. So now im looking for I guess TIP102 (NTE 2343) but I cant really find any. Hmmm I hope some of these stores locally are open today.

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    NECO Member CbOy2000's Avatar
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    Re: 102 Transistor

    I did this mod on my IMRC about 6 months ago and it works great but the transistor you did buy is the wrong one unfortunately. Here is a link to one that should work correctly TIP102
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    NECO Member cbman's Avatar
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    Re: 102 Transistor

    If you want something that you can just find at radioshack, the TIP120 should work. It is also an NPN Darlington transistor in the TO-220 size. Or, if you could find a TIP122 that would be even bettersince its rated for 100V. The TIP120 is only rated for 60V, but I don't think that will be a problem.

    BTW: What is the purpose of this mod?
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    NECO Member DesertNeco's Avatar
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    Re: 102 Transistor

    I finally found the right one (NTE 2343) at frys and bought 2 of them just in case. I put it in tonight and it works great. Seems like I got alittle bit of pull back now I just need to gut those pre cats and we are all good I think.

  7. #6
    NECO Member SlowCat's Avatar
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    Re: 102 Transistor

    Quote Originally Posted by cbman View Post
    If you want something that you can just find at radioshack, the TIP120 should work. It is also an NPN Darlington transistor in the TO-220 size. Or, if you could find a TIP122 that would be even bettersince its rated for 100V. The TIP120 is only rated for 60V, but I don't think that will be a problem.

    BTW: What is the purpose of this mod?

    It is for a failing IMRC. If the only problem is the transistor overheating or being bacd then it can be swapped for several others that will all work. There are some ups & downs to it, but it's a lot cheaper than buying a new control box.

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    Re: 102 Transistor

    I found a TIP102 transistor somewhere online, apparently it was the wrong one. It caused my IMRC to be 'stuck open', I didn't realize this at first but it wound up smoking my motor (IMRC motor) and taking the board with it. Just make sure you do ENOUGH research before hand.
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    NECO Member DesertNeco's Avatar
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    Re: 102 Transistor

    I found out you cant really use tip102 unless your careful and look and the current. NTE 2343 is what got me it at frys and its been working perfect now. Either way research is good.

  10. #9
    NECO Member andreyyyk's Avatar
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    Re: 102 Transistor

    i thought it was suppose to be a TIP121?

  11. #10
    NECO Member Belgium_warrior's Avatar
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    Thumbs down Re: 102 Transistor

    As my IMRC suddenly started acting up again after I moved it some time ago next to the battery, I suppose it's time to break out the welder and replace the transistor.
    Symptoms are that sometimes ( not always), whether it's hot or freezing cold outside ( it seems worse the colder it gets outside!), whether the engine is hot or not, the runners SHUT while in high revs ( +3750) or stop opening when at low revs and won't open again until I turn off the ignition for about 5 - 10 seconds at least, then she's fine again.
    I started looking for a shop that sells the TIP121 and stumbled across a site that has detailed info on the part. I felt obligated to post this here as t hisis very good stuff for those who know what it all means and it isn't mentioned in any of the ~5000 other imrc problem threads.
    Configuration Single
    Maximum Collector Base Voltage 80V
    Maximum Collector Cut-off Current 200μA
    Maximum Collector Emitter Voltage 80V
    Maximum Continuous DC Collector Current 5A
    Maximum Emitter Base Voltage 5V
    Maximum Operating Temperature 150C
    Minimum Operating Temperature -65C

    Mounting Through Hole
    Number of Elements per Chip 1
    Pin Count 3
    Product Height 8.72
    Product Length 10.4
    Product Width 4.6
    Supplier Package TO-220
    Type NPN

    I put the operating temperature bold for obvious reasons.
    I also put the 5V maximum output voltage in red because this is key to proper imrc box functionality; the electric engine inside the box receives a 12V when the runners need to open. It needs all 12V to overcome the countertension from the springs on the other end of the cable. If it were to keep getting 12 volts, it's run too hot trying to pull the cable even more when it can't. So the electronics, after opening, change voltage delivery to 5 volts. 5 is just enough to keep the runners open without overheating the engine. More, it gets too hot, less, the runners close as the engine can't counter the spring tension anymore.
    Just to be complete, below is the same info but on the 102:
    Configuration Single
    Maximum Collector Base Voltage 100V
    Maximum Collector Cut-off Current 50μA
    Maximum Collector Emitter Voltage 100V
    Maximum Continuous DC Collector Current 8A
    Maximum Emitter Base Voltage 5V
    Maximum Operating Temperature 150C
    Minimum Operating Temperature -65C

    Mounting Through Hole
    Number of Elements per Chip 1
    Pin Count 3
    Product Height 9.15
    Product Length 10.4
    Product Width 4.6
    Supplier Package TO-220
    Type NPN

    So these are the differences, first line TIP 102 second line TIP121
    Maximum Collector Base Voltage** 100V
    Maximum Collector Base Voltage 80V
    Maximum Collector Cut-off Current** 50μA
    Maximum Collector Cut-off Current 200μA
    Maximum Collector Emitter Voltage** 100V
    Maximum Collector Emitter Voltage 80V
    Maximum Continuous DC Collector Current** 8A
    Maximum Continuous DC Collector Current 5A

    I'm no electronics expert but the 2 are obviously very different an 8 amps is a lot more than 5 amps. I'd stick with the 121, anyone stating that the 102 is a better or improved model is talking out of context or ignorance.
    Last edited by Belgium_warrior; 2010-12-14 at 08:32 AM.

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