Change from NXP Mifare 4 byte UID number to 7 byte UID number
Guidance for the change from NXP Mifare
4 byte UID number to 7 byte UID number
The UID of Mifare cards is in most cased used to identify the card during the selection and anti-collision process. It also serves as a logical identifier in contactless systems. Now the NXP Unique 4 Byte IDs will be discontinued for Mifare1S50 (1K) and Mifare1S70 (4K) NXP offers two options for future Mifare card and tags orders:
1. Mifare 7 Byte UID
2. Mifare 4 Byte NU (Non-Unique) UID
Non-unique IDs need to be considered in the contactless systems as their 7 Byte UID numbers might cause problems in automatic fare collection, closed loop payment and access management applications!
iDTRONIC Customers will have the choice to purchase either products with unique 7 Byte ID’s or 4 Byte NU IDs, which are not globally unique any more.
New Mifare 7 Byte and 4 Byte NU cards and tags will be available from Q4 2011, until then all orders will be produced with standard Mifare 4 Byte UID.
