The NE monolithic timing circuit is a highly sta- ble controller capable of producing accurate time delays or oscillation. In the time delay mode of op- eration. STMicroelectronics NEN: available from 12 distributors. Explore Integrated Circuits (ICs) on Octopart: the fastest source for datasheets, pricing, specs. NEN datasheet, NEN pdf, NEN data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Single Timer.

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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I’ve implemented a water level indicator using a timer. It works fine when I use N, but the output is always high when I replace it with P. I have tried four Ps to rule out the possibility of a faulty IC, but it still doesn’t work. Meanwhile N works I’ve checked with two ICs. I googled it and found that there is virtually no difference between them.

So, why is this happening? Link to falstad circuit. In general, when a circuit works with a device from one maker and not from another it is telling you is that your design is incorrectly using some feature of the device on the verge of the design characteristics.

That is a bad thing.

You say it works with a N, but I am willing to bet if you tested enough N samples, only a proportion of them will work. So be glad you tried the other part.

555 Timer IC

Fix your design so the reset pin gets what it really needs, i. You are using the conductance of water to trip the reset line and this is not a great idea given that the reset pin current the leakage current from the reset pin is in the realm of 0. So, if it is producing 0. If the current is twice as high it will produce 2 volts etc. Maybe one device inherently produces a lower reset pin leakage current and this happens to work on dayasheet NEN device you have tested.


As far as I can tell, you have a bad design and it may work with one chip but it certainly can’t be expected to work with different supplier’s chips. 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 dtaasheet to these policies.

Timer | IC Datasheet | NE Pin Diagram

Home Questions Tags Users Unanswered. One works, the other does not! Link to falstad circuit Circuit diagram: This P doesn’t work: Peter Mortensen 1, 3 14 Ashish Ranjan 1 7. Make a test circuit not involving water. Feb 21 at It works with N but not P. I am getting downvoted here without really an explanation. Andy and Trevor gave me some direction to proceed in their answers. I datasheet really thankful to them for this.

However, people in the comments are just saying the circuit is bad without explaining why.

You know what, I understand there is datashee bad with the system. I didn’t know what? That’s why I asked the question.

I mean, I don’t have a problem with downvoting the question, but please first provide me an explanation why? I was struggling with this for the past week. I really sorry for this rant, but this made me very uncomfortable.


I think the attitude was probably what led to any downvotes you may have gotten. You repeatedly argued with people saying “but it worked on one of them”.

I would have posted an answer but Trevor’s pretty much covers what I dqtasheet going to say.

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Not all chips are made ratasheet, even ones with effectively the same functions and names. Thank you so much jsotola for taking your time to provide me with the resources!

I’ll most definitely try this and let you know the results: In this case how you are driving the reset pin.

You likely need to add a simple comparator 555n, with hysteresis, to do that. Your design is flakey. The water sensor can only add voltage to the reset pin so this doesn’t help. Try a redesign and don’t think that it must be a good design if it works on chip A.

Andy aka k 10 I will try with a different circuit and share my observations. Sign up or log in Catasheet up using Google.

555 timer IC

Sign up using Facebook. Sign up using 555m and Password. Post as a guest Name. Email Required, but never shown. 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.