Low Frequency vs High Frequency

Low frequency readers are often cheaper (although not always due to the mass production of high frequency).

Low frequency writable tags typically have smaller memory and the data transfer between read and tag is slower due to the lower frequency.

High frequency tags can often have a shorter range than low frequency.

High frequency tags are often cheaper due to mass production volumes.

Maximum range – for low cost modules such as those from people like ibtechnology.co.uk

For high frequency 13.56MHz iCode will likely give you the best range for a writable tag.  However it won't be as big as for the best low frequency tags,

For low Frequency 125kHz Hitag 1 will likely give you the best range for a writable tag.  This will be better than iCode and has better noise immunity in more industrial environments.

UHF for longer range with passive tags

UHF passive tags can provide reasonably long read ranges (2m for instance) and the ability to read multiple tags all coming into range at the same time, but there are some considerations.  The read range it is not guaranteed as the reading of the tags can be easily interfered with:

Firstly the human body is very good at blocking the signal and any tags very close to the skin or on the other side of the body to the reader can stop it working even at 1m range.  One solution often used to the close to the skin issue is to use foam between the skin and the tag (>5mm works well apparently), but being on the other side of the body as it passes the reader may still be an issue. Locating tags in a helmet or in the collar of a jacket can be a good way of solving this issue if its possible.

Secondly metal will affect the read range, specifically metal around the reader and metal around / near the RFID tag.

Also important to consider is that UHF readers can be expensive and are not necessarily available with UART interfaces (Ethernet is a popular interface).

Low Frequency 125kHz

EM4100

EM4102

​Very popular for read only RFID tags​

EM4105

EM4150

EM4200

Very popular for read only RFID tags

EM4350

EM4450

FDX-B

HID Prox

Hitag 1, 2

Hitag 1 gives good range and has good noise immunity in more industrial type environments.

Hitag 1 S256 has 256 writable bits (8 characters).  Hitag 1 S2048 has 2048 writable bits (256 characters)

Hitag S

Indala

Flexpass

MIRO

Q5

T5557

T5567

T5577

Ttitan

Unique

Read / Write.  Good general use choice.

Zoodiac

Low Frequency 134.2kHz​

64Bit R/O

64Bit R/W

1088Bit Multipage

High Frequency 13.56MHz

ISO14443A

Mifare

Mifare general notes:

RFID tags / cards are quite cheap as Mifare is widely used and therefore very mass produced.

Security is available and Mifare is used for London Oyster cards for example

The range of Mifare is not as good as a protocol like ICode (which can give double the range for the same power and antenna)

Mifare Mini, Classic 1k, 4k

Mifare DESFire EV1

Mifare Mini

Mifare Plus S, X

Mifare Pro X

Mifare SmartMX

Mifare Ultralight

Mifare Ultralight is fairly ubiquitous​ and therefore a good high frequency choice in terms of availability of a wide range of readers and tags.

Mifare Ultralight C

 

SLE44R35

SLE66Rxx

my-d move

ISO14443B

Calypso

CEPAS

Moneo

Legic Advant

SRI512

SRT512 SRI4K

SRIX4K

ISO15693

EM4033

EM4233

EM4135

ICODE SLI

​Very good range.  Can be double that of Mifare for a given power and antenna size.

M24LR16/64

my-d

MB89R118/119

Tag-it

HID iClass

PayPass

Legic Advant

PicoPass

 

 

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