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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Let’s say we used 2. Sign up using Facebook. Email Required, but never shown. I’m not a fan of the 5. For that you’d have to follow what is shown here and properly dxtasheet in all the assumptions like the beta of the transistors.

Note how the suggested by OP resistor values aren’t that well chosen. I added both circuits. Sign up using Email and Password. When Q1 is off, Q2 is off, which then does not try to turn on Q1.

(PDF) 2SA1273 Datasheet download

That’s the main current that Q1 needs to be able to sink when on. I would use 1. I can’t find a relacement or equivilent. 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 purpose of R8 is to make sure Q4 is off when not being explicitly driven.


I think that for both sets of resistor values the latch will work. OK I found it. This is a good answer and shows datasheey process you need to follow to make proper component value choices. Log in to post comments. Looking for Germanium Transistor for Rovio. The base of Q1 needs 2. You can get them from Newark at this s2a1273 This can work for different values of the resistors R2, R3, R7, R8.

Sign up or log in Sign up using Google. Home Questions Tags Users Unanswered. Picked up a dozen just in case from a guy on ebay. Also from what I’ve read, Ge transistors are prone to eairly demise.

Olin Lathrop k 30 Q2, Q4 is 2SA Once you understand what each part datssheet, you’ll be able to find acceptable values for them yourself. About Us Advertise Contact Us. The circuits very likely will work but I would not say either circuit in the question is “well designed” or very “robust”. The minimum R7 current is now 1. Let’s say now B-E is mV. Let’s therefore work backwards eatasheet Q1 to sink 2.

Changing R2, R3 will make the latch work or not. The RoboCommunity Webiste no longer accepts new users. Anyone know where I can pick up one datasneet these bad boys? That means a total of at least 1. Jax edited the first few lines “removed that is”.

(PDF) 2SA Datasheet PDF Download – Silicon PNP Transistor Epitaxial Planar Type(PCT PROCESS)

The load is a unspecified LED emitting visible light. I would therefore use 3.


Olin Lathrop I’m trying to make an accurate calculation, but I have little understanding of how to produce it. That shorts the base of Q1 to ground, turning it off. I am assuming that there should be another one on the circuit board.

Now 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. Datasgeet 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. For Q4 I think it depends on the load, how much current the load needs. R8 is only to turn off Q4 when it is not being actively driven on.

When SW2 is pressed, it turns on Q3. Hey all, I’ve been trying to figure out why one of my Rovio’s motors only spins one way. That pulls the top end of R4 which, which turns on Q1. Content is read only for historical purposes.