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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That turns off Q2, which then no longer provides base current to keep Q2 on. The RoboCommunity Webiste no longer accepts new users. I can’t find a relacement or equivilent. 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 LED D1 is used as an example of a load.

The purpose of R8 is to make sure Q4 is off when not being explicitly driven. Looking for Germanium Transistor for Rovio. It’s still difficult for me to understand, but I will learn. Sign up using Facebook. Lower values turn it off faster. When SW2 is pressed, it turns on Q3. When Q1 is off, Q2 is off, which then does not try to turn on Q1.

You now say that you want to support a final load current of mA, and that the gain of Q4 is I would therefore use 3. I added both circuits. R8 is only to turn off Q4 when it is not being actively driven on.


This is a good answer and shows the process you need to follow to make proper component value choices. Thanks for the feed back. Since you haven’t specified speed, there is no way to say whether 5. But then you’re near the edge of what this PNP can do.

2SA1273 PDF – PNP Transistor – KEC

With R4 of 5. 2sa123 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. Here is the datasheet URL for this transistor.

What is the difference between the circuits?


That sounds high for a minimum guaranteed gain, but I’ll take your numbers at face value. That means a total of at least 1. Let’s say now B-E is mV.

I’d round down to the next common value of 2. I would use 1. Instead of just poking at random values and asking what difference they make, stop and actually think about the circuit. Sunday, 30 May Let’s therefore work backwards requiring Q1 to sink 2. Added You now say that you want to support a final load current of mA, and that the gain of Q4 is Changing R2, R3 will make the latch work or not.


The minimum R7 current is now 1. Q2, Q4 is 2SA First, let’s see how much current Q1 needs to sink when on. That large current isn’t really needed. Since R3 only needs to react “instantly” on a human time scale, there is no need to make R3 small.

I think that for both sets of resistor values the latch vatasheet work.

Jax edited the first few lines “removed that is”. Soldered it in and voila, works perfectly. I found the trigger latch circuit: The lowest voltage drop for such a LED would be 1. Email Required, but never shown. For Q4 I think it depends on the load, how much current the load needs. Figure another mV for Q4 when saturated, leaving 2. About Us Advertise Contact Us. OK I found it. The main job of Q1 is to turn on Q4, so it can power the load.

The base of Q1 needs 2.

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