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 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 website is subject to these policies. I’m not a fan of the 5.

latch – What is the difference between the circuits? – Electrical Engineering Stack Exchange

The circuits very likely will work but I would not say either circuit in the question is “well designed” or very “robust”. Sign up using Email and Password. Figure another mV for Q4 when saturated, leaving 2.

The base of Q1 needs 2. It’s still difficult for me to understand, but I will learn.

2SA1273 Datasheet, Equivalent, Cross Reference Search

This pulls the bottom end of R2 low, which turns on Q2. I am assuming that there should be another one 2za1273 the circuit board. Content is read only for historical purposes. I can’t find a relacement or equivilent. Olin Lathrop k 30 Here is the datasheet URL for this transistor.


With R4 of 5. Please post the readings and I’ll try to help you find a replacement. Note how the suggested by OP resistor values aren’t that well chosen.

Q1 and Q2 are arranged with positive feedback so that they have two stable operating points. So now you ddatasheet be able to see for yourself what a good range of values for the resistors are.

Looking for Germanium Transistor for Rovio

This can work for different values of the resistors R2, R3, R7, R8. I added both circuits.

Let’s say we used 2. The lowest voltage drop for such a LED would be 1. But then you’re near the edge of what this PNP can do. I found the trigger datadheet circuit: Jax edited the first few lines “removed that is”. That sounds high for a minimum guaranteed gain, but I’ll take your numbers at face value.

2SA Datasheet PDF – PNP Transistor – KEC

That means a total of at least 1. Added You now say that you want to support a final load current of mA, and that the gain of Q4 is 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 the optimum values.


I thank you for having responded to my question. Sunday, 30 May That turns off Q2, which then no longer provides base current to keep Q2 on. Let’s say now B-E is mV.

That’s the main current that Q1 needs to be able to sink when on. Sign up or log in Sign up using Google. The circuit basically consists of 3 sections: I think that for both sets of resistor values the latch will work. Looking for Germanium Transistor datxsheet Rovio. I would therefore use 3. First, let’s see how much current Q1 needs to sink when on. R8 is only to turn off Q4 when it is not being actively driven on. Changing R2, R3 will make the latch work or not.