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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2SA1273 PDF – PNP Transistor – KEC

I can’t find a relacement or equivilent. From inspection, we can see that the current to drive Q2 can be much smaller than that. Thanks for the feed back.

Let’s therefore work backwards requiring Q1 to sink 2. Sign up using Email and Password. Now you have to go back daatsheet update the min required current sink value for Q1, and ripple thru all the downstream calculations from that as shown above. This is a good answer and shows the process you need to follow to make proper component value choices. Changing R2, R3 will make the latch work or not. 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.

So now you should datashdet able to see for yourself what a good range of values for the resistors are. Q2, Q4 is 2SA I would therefore use 3. But then you’re near the edge of what this PNP can do. That shorts the base of Q1 to ground, turning it off. I am assuming that there should be another one on the circuit board. About Us Advertise Contact Us.

2SA PDF – PNP Transistor – KEC –

When SW1 is pressed for a little while, Q1 is turned on. Figure another mV for Q4 when saturated, leaving 2. Each transistor being on keeps the other on.

Log in to post comments. That means a total of at least 1. For that you’d have to follow what is shown here and properly fill in all the assumptions like the beta of the transistors. The load is a unspecified LED emitting visible light. I thank you for having responded to my question. That’s the main current that Q1 needs to be able to sink when on. I think that for both sets of resistor values the latch will work. I’m not a fan of the 5.

This pulls the bottom end of R2 low, which turns on Q2. What is the difference between the circuits?

Content is read only for historical purposes. Soldered it in and voila, works perfectly. That sounds high for a minimum guaranteed gain, but I’ll take your numbers at face value.

Jax edited the first few lines “removed that is”.

2SA NTE Equivalent NTE12 TRANSISTOR PNP SILICON – Wholesale Electronics

Let’s say we used 2. Hey all, I’ve been trying to figure out why one of my Rovio’s motors only spins one way. The lowest voltage drop for such a LED would be 1. 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.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policy 2sz1273, and that your continued use of the website is subject to these policies.

The main job of Q1 is to turn on Q4, so it can power the load. Also from what I’ve read, Ge transistors are prone to eairly demise.

By Ohm’s law, the maximum R7 value is datashet 3. Q1 and Q2 are arranged with positive feedback so that they have two stable operating points. Once you understand what each part does, you’ll be able to find acceptable values for them yourself. First, let’s see how much current Q1 needs to sink when on.