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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To do even better I’d use some CMOS logic based circuit because that will be miles better regarding power consumption. You can get them from Newark at this link: By clicking “Post Your Answer”, you acknowledge that datasheft have read our updated terms of dattasheetprivacy policy and cookie policyand that your continued use of the website is subject to these policies. The minimum R7 current is now 1. So now you should be able to see for yourself what a good range of values for the resistors are.

2SA1273 PDF – PNP Transistor – KEC

Thanks for the feed back. That shorts the base of Q1 to ground, turning it off.

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Anyone know where I can pick up one of these bad boys? Looking for Germanium Transistor for Rovio. But then you’re near the edge of what this PNP can do. Datashwet is a good answer and shows the process you need to follow to make proper component value choices. The main job of Q1 is to turn on Q4, so it can power the load.

Let’s therefore work backwards requiring Q1 to sink 2. Q2, Q4 is 2SA It’s still difficult for me to understand, but I 2sa123 learn.

Looking for Germanium Transistor for Rovio |

You now say that you want to support a final load current of mA, and that the gain of Q4 is This pulls the bottom end of R2 low, which turns on Q2. When SW1 is pressed for a little xatasheet, Q1 is turned on.

Here is the datasheet URL for this transistor. The load is a unspecified LED emitting visible light. 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 The RoboCommunity Webiste no longer accepts new users.

I can’t find a relacement or equivilent.


Log in to post comments. Also from what I’ve read, Ge transistors are prone to eairly demise. I added both circuits. I’ve read that for the most part silicon tranistors are drop in replacements.

I think that for both sets of resistor values the latch will work. Picked up a dozen just in case from a guy on ebay. I found the trigger latch circuit: I’d round down to the next common value of 2. Once you understand what each part does, you’ll be able to find acceptable values for them yourself. For Q4 I think it depends on the 2sa173, how much current the load needs.

When SW2 is pressed, it turns on Q3. Let’s say we used 2. About Us Advertise Contact Us. With R4 of 5. Lower values turn it off faster.

2SA1273 Datasheet

That large current isn’t really needed. Changing R2, R3 will make the latch work or not. Figure another mV for Q4 when saturated, leaving 2. Olin Lathrop k 30