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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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I think that for both sets of resistor values datashert latch will work. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Something in the 2. Let’s say now B-E is mV. Lower values turn it off faster.

2SA datasheet(1/1 Pages) KEC | Silicon PNP Transistor Epitaxial Planar Type(PCT PROCESS)

datasgeet Each transistor being on keeps the other on. I’m not a fan of the 5. It’s still difficult for me to understand, but I will learn.

When SW1 is pressed for a little while, Q1 is turned on. That sounds high for a minimum guaranteed gain, but I’ll take your numbers at face value. The LED D1 is used as an example of a load.

(PDF) 2SA1273 Datasheet download

R8 is only to datasgeet off Q4 when it is not being actively driven on. That shorts the base of Q1 to ground, turning it off. That large current isn’t really needed.


Olin Lathrop k 30 I’d round down to the next common value of 2. I found the trigger latch circuit: The lowest voltage drop for such a LED would be 1.

Figure another mV for Q4 when saturated, leaving 2. I would use 1. The RoboCommunity Webiste no longer accepts new users. That means a total of at least 1. Thanks for the feed back.

Let’s say we used 2.

NTE12 – PNP Transistor, SI High Current Amp

When SW2 is pressed, it turns on Q3. This can work for different values of the resistors R2, R3, R7, R8. Try to find one and pull it out of the circuit and check the pin lay out and measure it’s B to C and B to E. Sign up using Email and Password. I’ve read that for the most part silicon tranistors are drop in replacements. That’s the main current that Q1 needs to be able to sink 2sa173 on. So now you should be able to see datasheet yourself what a good range of values for the resistors are.

Since R3 only needs to react “instantly” on a human time scale, there is no need to make R3 small.

What is the difference between the circuits? The circuits very likely will work but I would not say either circuit in the question is “well designed” or very “robust”. Post Your Answer Discard 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 datasyeet is subject to these policies.


Content is read only for historical purposes. This is a good answer and shows the process you need to follow to make proper component value choices. Post as a guest Name. Q2, Q4 is 2SA Anyone know where I can pick up one of these bad boys?

Home Questions Tags Users Unanswered. Now you have to datasheef back and update the min required current sink value for Q1, and ripple thru all the downstream calculations from that as shown above. Note how the suggested by OP resistor values aren’t that well chosen. Please post the readings and I’ll try to help you find a replacement. The circuit basically consists of 3 sections: To do even better I’d use some CMOS logic based circuit because that datasgeet be miles better regarding power consumption.

Sunday, 30 May Looking for Germanium Transistor for Rovio. I am assuming that there should be another one on the circuit board.