Quad Comparator Pins
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- Apprentice
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- Joined: Tue Jan 24, 2006 4:38 pm
Quad Comparator Pins
Hello
How can I determine the pin numbering on these chips? The packaging didn't explain anything. I am building the circuit from the plans on this website, 4 lane version.
Thanks!
How can I determine the pin numbering on these chips? The packaging didn't explain anything. I am building the circuit from the plans on this website, 4 lane version.
Thanks!
- gpraceman
- Site Admin
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Re: Quad Comparator Pins
Where did you get the quad comparators from? What brand are they?
You may be able to find a spec sheet for them on the website for the supplier or the manufacturer.
You may be able to find a spec sheet for them on the website for the supplier or the manufacturer.
Randy Lisano
Romans 5:8
Awana Grand Prix and Pinewood Derby racing - Where a child, an adult and a small block of wood combine for a lot of fun and memories.
Romans 5:8
Awana Grand Prix and Pinewood Derby racing - Where a child, an adult and a small block of wood combine for a lot of fun and memories.
- Stan Pope
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Re: Quad Comparator Pins
One corner pin (in a DIP package) should be distinguished by a mark on the top of the body, usually (in my distant experience) a circular indentation. This is pin #1. Numbering progresses sequentially along that side of the body, jumps across the body, and continues back toward the original end.
Sometimes only the #1 end of the DIP package is identified by a semicircular indentation in the top of the body. Since I am dexlistic (or is it dislexic?), I won't try to tell you from memory whether numbering (as viewed from the top of the body) is clockwise or counterclockwise.
Sometimes only the #1 end of the DIP package is identified by a semicircular indentation in the top of the body. Since I am dexlistic (or is it dislexic?), I won't try to tell you from memory whether numbering (as viewed from the top of the body) is clockwise or counterclockwise.
Stan
"If it's not for the boys, it's for the birds!"
"If it's not for the boys, it's for the birds!"
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- Apprentice
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Re: Quad Comparator Pins
You did not say which part you were using. A LM339 is a common comparator made by a number of manufacturers.
Here is the datasheet for National Semiconductors LM339:
http://cache.national.com/ds/LM/LM139.pdf
The top of page 18 has a good diagram of the DIP package.
Pin 1 markings may vary somewhat between manufacturers.
Here is the datasheet for National Semiconductors LM339:
http://cache.national.com/ds/LM/LM139.pdf
The top of page 18 has a good diagram of the DIP package.
Pin 1 markings may vary somewhat between manufacturers.
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- Apprentice
- Posts: 17
- Joined: Tue Jan 24, 2006 4:38 pm
Re: Quad Comparator Pins
Hello again,
Here is a picture of the chip in question:
Any help determining pin 1 is appreciated.
Thank you.
Here is a picture of the chip in question:
Any help determining pin 1 is appreciated.
Thank you.
- Stan Pope
- Pine Head Legend
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- Joined: Sat Jul 05, 2003 7:01 pm
- Location: Morton, Illinois
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Re: Quad Comparator Pins
Note the pic on page 18 of the referenced pdf (http://cache.national.com/ds/LM/LM139.pdf and compare to your pic. Almost invisible on the left end of your pic is a semicircular notch that identifies the "pin 1" end of the DIP. According to the page 18 pic, pin 1 is on the lower left of the pic.
Stan
"If it's not for the boys, it's for the birds!"
"If it's not for the boys, it's for the birds!"
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- Apprentice
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Re: Quad Comparator Pins
Thank you Mr. Pope.
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- Apprentice
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- Location: PA
Re: Quad Comparator Pins
As NealonWheels and Stan said it in previous posts, pin #1 is in left lower corner as viewed from your picture, with pin number going up numerically in counter clockwise direction ending with pin #14 above pin #1. The notched end will be toward your left.