ATA5700

The ATA5700 is a fully passive 125 kHz transponder IC that derives all operating power from the inductive field generated by a compliant LF reader/interrogator; it has no battery and no wired digital interface. Communication follows ISO 11784/11785 FDX-B framing, with the chip also supporting the ISO 14223 air-interface extension used for advanced, read/write animal-ID transponders. On power-up, the IC transmits its factory-locked 32-bit unique ID along with any user data stored in its 512-bit (64-byte) EEPROM, using load modulation of the coil to return data to the reader. Built-in anti-collision logic allows multiple tags within a single reader field to be enumerated without data corruption, a requirement for herd-scanning and bin-level asset reads. Because the memory map mixes a read-only ID block with user-writable EEPROM pages, write operations to the configurable region require the correct access password before the chip accepts new data over the RF link.

The ATA5700 is deployed almost exclusively in animal identification programs, where its ISO 11784/11785 FDX-B compliance lets it work with the global base of livestock and companion-animal LF readers. Typical form factors are glass-encapsulated implantable microchips for pets and research animals, and ceramic or overmolded ear tags for cattle, sheep, and swine traceability schemes. The same die is also used in asset tracking pucks and tags for industrial environments where ruggedized, battery-free identification is needed on equipment exposed to moisture, dirt, or temperature swings. Compared with UHF alternatives, the 125 kHz LF choice favors tags mounted near metal, liquid, or animal tissue, where LF's short read range is an acceptable trade-off for reliability. Engineers choosing between this and Microchip's ATA5577M2/ATA5577M3 or T5577/ATA5577C families typically pick the ATA5700 specifically for mandated ISO 11784/11785 animal-ID compliance rather than generic access-control use cases.

Because the ATA5700 has no digital pins, all programming happens over the RF interface using an ISO 11784/11785/14223-compliant LF encoder or applicator station rather than a bench programmer; off-the-shelf pet-microchip and livestock-tag readers from major animal-ID vendors are the typical read-side tooling. The factory-programmed 32-bit unique ID occupies a fixed, read-only block and cannot be altered — design workflows around this rather than attempting re-IDing. The remaining EEPROM is user-writable but password-protected, so integrators must provision and track the write password per batch or per tag during encoding; losing it permanently locks out further writes. A common integration pitfall is encoding tags too close together or inside metal fixtures during the applicator step, which disrupts the inductive link and produces partial or failed writes — always verify with a read-back pass. When deploying multi-tag bins or pens, confirm the reader firmware actually implements the anti-collision routine, since some generic 125 kHz readers assume single-tag presence.

The ATA5700 is sourced through Microchip's distributor network and specialized animal-ID tag converters and encapsulators rather than general electronics distributors, since most buyers purchase finished glass or ceramic transponders rather than bare die. Expect MOQs and lead times driven by the encapsulation and sterilization steps (for implantable tags) as much as by silicon availability — budget accordingly if sourcing pre-encoded, ISO-compliant finished tags versus raw IC. When evaluating suppliers, ask explicitly whether tags are tested and certified to ISO 11784/11785 (and ISO 14223 if read/write user memory is required), what default write-password scheme is used, and whether anti-collision has been validated against your target reader hardware. If your application is industrial asset tracking without regulatory animal-ID requirements, cross-shop against Microchip's ATA5577 family or EM Microelectronic's EM4550/EM4470, which may offer more flexible memory configuration at lower cost for non-regulated LF tagging.