×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

74C02 replacement - Quad NOR to 15V!
2

74C02 replacement - Quad NOR to 15V!

74C02 replacement - Quad NOR to 15V!

(OP)
Anyone know of a replacement for the obsolete 74C02? All the new components I've found are limited to 5V in, but my controller (sustaining an old design) pulls up to 15V.

Any ideas? Thanks in advance!

RE: 74C02 replacement - Quad NOR to 15V!

Welcome to the seedy gray market of electronics.  You will have to deal with the guys wearing trench coats, driving grey primered vans, and meeting on secluded back roads to procure one.  It will likely require you to buy all of whatever stock a grey market buyer has.  So it becomes a visit to all the grey market places in search of the one with the least number of chips, in an attempt to keep the price down.

Just google for 74C02 and wade on in.

Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com

RE: 74C02 replacement - Quad NOR to 15V!

Here's a start:

http://www.findchips.com

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
"It's the questions that drive us"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

RE: 74C02 replacement - Quad NOR to 15V!

(OP)
Thanks, looks like i can get them after all... but if I can find a replacement I can save some huge $$ and headaches down the road.
Does anyone know of a modern replacement chip?

RE: 74C02 replacement - Quad NOR to 15V!

Mouser shows 74C02 offered by NTE (a line of replacement parts) in stock at around $33 each. (Ouch!) Newark shows the same NTE at around $25 with a 17 day leadtime. Digikey recoginzes the number, has no stock, and shows a minimum buy of 25,000 at around $7 each - I think that's the minimun $$ it takes to make a semi company run a few wafers.

4000 series CMOS are still around. You could re-spin your board to use a 4001B CMOS (quad NOR). They're still readly available and operate to 15 volts as well. Half the gates in the package match the pin-out of the 74C02. You would have to rewire 4 of the pins to work. Or, could you make an adapter board to use the 4001B? A CD4001B from TI, ON Semi, or Fairchild are available at Digikey for around $0.50 each. They're even available in several different SMT packages. There is probably a 4000 series schmitt NOR - you could search the 4000 series offerings more.

The 4000 series CMOS devices were the most popular of this kind of higher-voltage device. The 74Cxx equivalents of the popular 74xx series 5 volt logic never became as popular, so they're hard to get where the pinout differs from the 4000 series.

RE: 74C02 replacement - Quad NOR to 15V!

(OP)
Thanks, it looks like the 4001 is the best choice for moving forward, and for the current design, I'm sure I can make an adapter board for less than $16.50!!!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close