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Part Number: HJ Function: NPN Epitaxial Silicon Transistor Maker: Unspecified Pinouts: HJ datasheet. Description: Datasheet. Type Designator: MJE Material of Transistor: Si. Polarity: NPN. Maximum Collector Power Dissipation (Pc): 40 W. Maximum Collector-Base Voltage |Vcb|. HJ Hefei Hejing datasheet pdf data sheet FREE Datasheets (data sheet) search for integrated circuits (ic), semiconductors and other electronic.

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If you don’t have a DMM, use ohms law to build this https: Info uj building and modding: You will, of course, read the same unreadably high ohm resistance between collector-emitter regardless hi bias. The alternative is that the P side must 1002 at least more positive than the N side respectively. If you don’t have a DMM, use ohms law to build this.

Can anybody identify which leg is which from the insides? In NPN, the opposite is true. This is an open community hm the do-it-yourself pedal builders of reddit! Please read this first! The base must also be negative with respect to collector and current will flow. Basically, you create a 133002 that needs the transistor to behave with X amount of gain otherwise the current is too weak to light the LED.

Put two of the legs between the LED. Thank you my friend, this is very helpful. I just cracked open this one hoping to illuminate which pin is which. The silicon is normally bonded to the collector, which would match the ECB left to right, flat writing side facing you, pins facing downwards pinout of the CD Not to worry, I have 2 exactly the same. It’s dead, you need a new transistor. Im going to assume the emitter is the large pad, so the base is going to be one of the others, and the collector is obviously the last.


Become a Redditor and subscribe to one of thousands of communities. C is probably the tiny pad, B is probably the long rail pad, and E is the large square pad.

FYI this is a 1300 voltage transistor designed for switching operation, very commonly found in compact fluorescent lamps. For instance, a beta gain transistor circuit would light up one LED if the gain is overa different LED if its over but underand so on. When the voltage rises high enough it would activate the junction and conduct. If the LED still lights up, then the legs are of a diode in ‘proper orientation’. You can create your own test equipment for general guidelines if you’re creative.

If the LED does not light up, then reverse the two legs and if it lights up, you now have one diode. Can anybody help me identify the legs of this transistor? Then test the other two legs.

HJ Datasheet –

Use of this site constitutes acceptance of our User Agreement and Privacy Policy. Welcome to Reddit, the front page of the internet. Sorry if this is a very pedestrian question, I’ve already tried my best on google: Transistors function in their active gj as class A amplifiers thanks to the base-collector being reverse biased while the base-emitter is forward biased.

I found this in a light bulb, but can’t tell which leg is which. Log in or sign up in seconds. Doing so would actually improve your knowledge and and your soldering skill and get you some really cheap tools, although DMMs these days aren’t very expensive.


In a PNP, the base is the 1302, so it must be negative with respect to the emitter and it will be biased and current will flow.

HJ13002 PDF – Vcbo=600V, NPN Transistor

I know the Base is typically in the middle, but i googled the numbers from the face,HJ, B1 and found a datasheet for the HJ Transistor, which said the Base was the leftmost leg. With a DMM, you 1302 test the legs and each pair that has low resistance is a forward biased junction, any pair that has high resistance is a reverse biased junction.

Looking for troubleshooting help?

So I’m attempting my first pedal, and I’m totally new to electronics altogether. If you have a DMM, you should read something like megaohms between a forward biased base-collectopr and a forward biased base-emitter. This is a transistor diode tester.

MJE13002 Datasheet, Equivalent, Cross Reference Search

Now amend 113002 circuit so that the negative side of the battery or ground if you want to call it is touching one leg of your transistor, and another leg is touching the LED. You should read open circuit or beyond the measurement of your Hhj in ohms for reverse biased base-collector or base-emitter. Submit a new text post. It lights up if the diode of the transistor is forward biased. I don’t have a DMM but I’ll have to look into it. Want to add to the discussion?

Submit a new link. But I’m not positive it was the right datasheet.

You could test this yourself you know. I made it simpler from the rambling.