The ACR122U NFC reader from ACS (Advanced Card Systems Ltd.) was a very popular contactless reader and is still used in many applications all over the world.

It supports the ISO 14443 A/B standard and is suitable to work with the following chips: MIFARE Classic®, MIFARE Ultralight®, MIFARE® DESFire®, NTAG, FeliCa, and others.

Since the ACR122U USB NFC reader has been counterfeited by certain law-breaking parties and there are many bogus products of questionable quality and reliability, ACS no longer manufactures it and most of the distributors have already sold out the original ACR122U readers.

With this article, you will learn which are the best alternatives to the original ACR122U.

Is the reading distance of larger NFC tags greater than regular tags? Do they work faster? Which smaller NFC tag works well with regular NFC readers and mobile devices? In this article, you will learn about how the antenna size affects the operation of NFC chips. 
 

In over 12 years of operation in the field of RFID technology, we have helped our customers solve many problems, and below are the 7 most common reasons for RFID chips or readers to not work properly. If you need professional advice, we are available at info@rfidspecialist.eu.