Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It's 100% free.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

There are some devices such as step up converters that if you connect the power supply reversely it will burn, also some ICs such as ic555. my question is >> why the manufacturer doesn't use simply a diode for reverse current protection?

share|improve this question

Such a diode would

  • add to the size of the chip and hence to the price
  • drop some voltage, hence the chip would have less or you would have to supply more

Nearly 99.99% of the chips are bought by professionals, to be included in a carefully designed circuit. If that circuit needs reverse-polarity protection such protection is added at that (circuit) level, in a way that is appropriate for the product (diode, fuse/crowbar, asymmetric connectors, etc). Putting such a protection in each and every chip would be bad engineering.

Or see it this way: chip are not designed and optimized for the careless hobbyist, but for the large-volume buyer. Such buyers generally do not want to pay (in price or performance) for things that are not needed in a well-engineered and well-produced product.

share|improve this answer
2  
The voltage drop reduces efficiency significantly. – tokamak Mar 13 at 22:02

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.