Low Frequency :: Transponders ::

All transponders are available in read only (R/O and read write (R/W) types. Read Write types have 80-bits of re-programmable user memory.

Glass transponders are hermetically sealed which makes them completely water proof (e.g. for marine life), mount on metal tags are designed to perform better mounted on any metallic surface (e.g. vehicles).

The main benefit of the technology is the simplicity of the components and that it is very robust and easy to install.

Transponders are factory programmed during production by Texas Instruments with a 64-bit code which is virtually tamper proof plus an additional 16-bit CRC (error checking algorithm) to make sure that the tag is authentic and is an actual Texas Instruments tag.

The 64-bit code is a 16-digit hexadecimal number allowing up to 16 16 = 1.844x10 19 combinations of code, which is a very high number of combinations. This code is used as the unique identification (ID number).

Some transponders also have the following options available:
*Multi-page Transponder (MPT): same as read write transponder but with memory size of 1360 bits, organised into 17 pages with each page have 80bits of memory.
* Selective Addressable Multi-page Transponder (SAMPT): Same as the MPT function but enhanced to allow a user to read or program a single transponder in a group of transponders.
* Digital Signal Transponder (DST): Features a challenge/response encryption method that allows for secure authentication. Other features include secure id and optional password protection.

Transponder	Description	Data Functionality	Dimensions	Read Range
Badge and Card Series	A white card transponder that meets the requirements for personnel and vehicle access, asset management, door locks and a variety of other applications.	RO|R/W	85.6mmx 54mmx1.3mm	Max <100cm
85mm Disk Series	Designed to attach an automobile windshield, the Slim-line Disk is perfect for access control applications. The Slim-line disk's flat form and superior read range also suppliers supply chain and logistics applications.	RO|R/W	85.5mmx5.5mm	Max <160cm
30mm Disk Series	Specially designed for resistance to high temperature and shock for many industrial applications such as waste management, asset tracking and live stock tracking.	RO|R/W	29.4mm x 8.47mm	Max <100cm
Cylindrical Transponder	Specially packaged for withstanding harsh environments, allowing it to be attached to trucks and containers. The enhanced read range is useful in several supply chain and logistics applications.	RO|R/W	121mmx21mm,	Max <180cm
Mount-on-metal Transponder	Designed for direct mounting on metal surfaces such as trucks, buses or metal containers.	RO|R/W	102mm dia. x36mm x 16.5mm	Max <110cm
Glass Capsule	Commonly used for mobile commerce, automotive security, supply chain logistics tracking and livestock.	RO, R/W, MPT, SAMPT, DST	3.8mm dia x 23mm or 32mm length.	23mm<70cm 32mm<100cm
50mm Glass Capsule	Hermetically sealed read write glass transponder with enhanced read range for "non mechanical shock sensitive" applications.	R/W	16mm dia x 50mm length.	Max<165cm
Wedge	Extremely compact transponder is encapsulated within a plastic mold compound. The wedge is most commonly used for automotive security, door locks, and asset tracking.	RO, R/W, DST	12mmx6mmx3mm	Max<40cm
Key Fob	Compact transponder encapsulated into a small plastic key chain. The key fob is most commonly used for electronic door locks and retail payments.	RO, R/W	10.5mm (dia) x37.5mm	Max <70cm