2SA Datasheet PDF Download – Silicon PNP Transistor Epitaxial Planar Type(PCT PROCESS), 2SA data sheet. 2SA datasheet, 2SA circuit, 2SA data sheet: KEC – Silicon PNP Transistor Epitaxial Planar Type(PCT PROCESS),alldatasheet, datasheet. datasheet search, datasheets, Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes and other semiconductors.

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Post as a guest Name. That’s the main current that Q1 needs to be able to sink when on. When SW1 is pressed for a little while, Q1 is turned on. Thanks for the feed back. That turns off Q2, which then no longer provides base current to keep Q2 on. Sunday, 30 May Anyone know where I can pick up one of these bad boys? Q1 and Q2 are arranged with positive feedback so that they have two stable operating points.

This can work for different values of the resistors R2, R3, R7, R8. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

(PDF) 2SA Datasheet PDF Download – Silicon PNP Transistor Epitaxial Planar Type(PCT PROCESS)

Please post the readings and I’ll try to help you find a replacement. Sign up or log in Sign up using Google. The circuit basically consists of 3 sections: Home Questions Tags Users Unanswered. I thank you for having responded to my question.


Olin Lathrop k 30 The purpose of R8 is to make sure Q4 is off when not being explicitly driven. Once you understand what each part does, you’ll be able daatasheet find acceptable values for them yourself. Content is read only for historical purposes. Since you haven’t specified speed, there is no way to say whether 5. When Q1 is off, Q2 is off, which then does not try to turn on Q1.

2SA1273 Datasheet

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is vatasheet to these policies. Now you have to go back and update the min required current sink value for Q1, and ripple thru all the downstream calculations from that as shown above.

That means a total of at least 1. The base of Q1 needs 2. Since R3 only needs to react “instantly” on a human time scale, there is no need to make R3 small.

I am assuming that there should be another one on the circuit board. From inspection, we can see that the current to drive Q2 can be much smaller than that. This pulls the bottom end of R2 low, which turns on Q2.


Each transistor being on keeps the other on. I think that for both sets of resistor values the latch will work. With R4 of 5.

2SA Datasheet(PDF) – KEC(Korea Electronics)

I can’t find a relacement or equivilent. Changing R2, R3 will make the latch work or not. I would therefore use 3. Sign up using Facebook.

You now say that you want to support a final load current of mA, and that the gain of Q4 is Email Required, but never shown. Sign up using Email and Password. I added both circuits. Lower values turn it off faster. You haven’t provided a datasheet for the 2SA, so we’ll arbitrarily assume they can be counted on to have a gain of at least Suppose I wanted to feed this circuit from a battery then I want the currents to be as low as possible, for that I would completely re-calculate all resistor values to get datssheet optimum values.

I would use 1.