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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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 lowest voltage drop for such a LED would be 1.

2SA Datasheet PDF – PNP Transistor – KEC

The RoboCommunity Webiste no longer accepts new users. But then you’re near the edge of what this PNP can do. Note how the suggested by OP resistor values aren’t that well chosen.

The base of Q1 needs 2.

2SA1273 Datasheet

I can’t find a relacement or equivilent. When Q1 is off, Q2 is off, which then does not try to turn on Q1. I’m not a fan of the 5. For that you’d have to follow what is shown here and 2sw1273 fill in dztasheet the assumptions like the beta of the transistors. 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.


That shorts the base of Q1 to ground, turning it off. Added You now say that you want to support a final load current of mA, and that the gain of Q4 is I would use 1. This is a good answer and shows the process you need to follow to make proper component value choices. When SW1 is pressed for datasheef little while, Q1 is turned on.

The circuit basically consists of 3 sections: That pulls the top datadheet of R4 which, which turns on Q1. Log in to post comments.

Looking for Germanium Transistor for Rovio. OK I found it. About Us Advertise Contact Us. Jax edited the first few lines “removed that is”.

The main job of Q1 is to turn on Q4, so it can 2sa12733 the load. The minimum R7 current is now 1. Olin Lathrop I’m trying to make an accurate calculation, but I have little understanding of how to produce it. Once you understand what each part does, you’ll be able to find acceptable values for them yourself. Soldered it in and voila, works perfectly. When Datashest is pressed, it turns on Q3. Email Required, but never shown. Each transistor being on keeps the other on.

Sign up or log in Sign up using Google. It’s still difficult for me to understand, but I will learn. That sounds high for a minimum guaranteed gain, but I’ll take your numbers at face value.


With R4 of 5. Post as a guest Name. I’d round down to the next common value of 2. 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 using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. That turns off Q2, which then no longer provides base current to keep Q2 on.

Changing R2, R3 will make the latch work or not. Sign up using Facebook.

That large current isn’t really needed. The load is a unspecified LED emitting visible light.

2SA 데이터시트(PDF) – KEC(Korea Electronics)

That means a total of at least 1. Instead of just poking at random values and asking what difference they make, stop and actually think about the datasueet. Figure another mV for Q4 when saturated, leaving 2. Let’s say we used 2. Lower values turn it off faster.

I found the trigger latch circuit: That’s the main current that Q1 needs to be able to sink when on. Please post the readings and I’ll try to help you find a datqsheet.

Picked up a dozen just in case from a guy on ebay.