{"license":"Free for any use with attribution link to rfid-datasheet.com","citation":"RFID-Datasheet.com Chip Database — Roxtron","source":"https://rfid-datasheet.com/chip/t5577-ata5577c","methodology":"https://rfid-datasheet.com/methodology","data_notes":"Includes automated enrichment. Null means unknown; last_checked is link availability, not technical review. Manufacturer documents govern specifications.","generated_at":"2026-11-01T19:51:55.905Z","chip":{"id":"3d5557e0-57db-43d5-81b6-19e1b2a93cab","slug":"t5577-ata5577c","name":"T5577 / ATA5577C","manufacturer":"Microchip","frequency_category":"LF 125 kHz","short_description":"Multi-protocol rewritable LF tag, emulates EM4100/HID","manufacturer_url":"https://ww1.microchip.com/downloads/aemDocuments/documents/WSG/ProductDocuments/DataSheets/ATA5577C-Read-Write-LF-RFID-IDIC-100-to-150-kHz-Data-Sheet-DS70005357B.pdf","frequency":"100 kHz to 150 kHz (LF RFID, typically 125 kHz or 134 kHz)","protocol":"Configurable for ISO/IEC 11784/785 compatibility, compatible with T5557/ATA5567, replacement for e5551/T5551","memory":"363 bits EEPROM (11 blocks × 33 bits: 7 blocks user memory + password, 2 blocks unique ID, 1 configuration block, 1 option block)","interface":"RF (contactless), dual coil terminals (Coil 1/Coil 2) for power supply and bidirectional communication","temp_range":"-40°C to +85°C (operating ambient temperature)","form_factor":"Bare die (Type 1: 100 μm × 100 μm pads for wire bonding/flip chip; Type 2: 200 μm × 400 μm mega pads for direct coil bonding); also available as sawn wafer on foil, NOA3 micromodule, XDFN 1.5×2 mm package, transponder brick","security":"32-bit password mode, blockwise write protection (lock bits), One-Time-Programmable (OTP) functionality, Answer-On-Request (AOR) mode for anti-collision","use_cases":["access-control","animal-identification","automotive-immobilizer","asset-tracking"],"engineering_brief":"The ATA5577C is a highly versatile contactless read/write LF RFID chip operating at 100–150 kHz (typically 125 or 134 kHz). It features 363 bits of EEPROM organized into 11 configurable blocks, supporting multiple modulation schemes (Manchester, Bi-phase, FSK, PSK, NRZ) and data rates (RF/2 to RF/128). With ISO 11784/11785 compatibility, password protection, OTP functionality, and programmable downlink protocols (fixed-length, long-leading-reference, leading-zero, 1-of-4 coding), it serves as a flexible drop-in replacement for T5557/ATA5567 and e5551/T5551 chips in access control, animal ID, and cloning applications. Delivered as bare die or in multiple packaged formats with on-chip trimmed capacitors (250/330 pF ±3%).","enriched":true,"url_status":"ok","link_status":"valid","last_checked":"2026-11-01T03:31:28.371+00:00","last_status_code":200,"last_content_type":"application/pdf","created_at":"2026-06-14T16:30:56.111445+00:00","manufacturer_id":"0d14da2e-89ab-40d6-bc5c-b187f4e33681","chip_type":"tag_ic","dual_interface":false,"is_family_hub":true,"meta_description":"Microchip ATA5577C/T5577: Rewritable LF RFID tag IC (125/134 kHz) with 363-bit EEPROM, multi-protocol emulation (EM4100/HID), password protection for access control and animal ID.","faq":[{"a":"The T5577 can emulate multiple LF RFID protocols including EM4100, HID Prox, Indala, and others by supporting various modulation schemes (Manchester, Bi-phase, FSK, PSK, NRZ) and configurable data rates. It is ISO 11784/11785 compatible for animal identification applications.","q":"What protocols can the T5577 chip emulate?"},{"a":"The ATA5577C contains 363 bits of EEPROM organized into 11 blocks of 33 bits each. This includes 7 blocks for user data and password storage, 2 blocks for unique ID, 1 configuration block, and 1 option block.","q":"How much memory does the ATA5577C have?"},{"a":"Yes, the T5577/ATA5577C is fully compatible with T5557/ATA5567 and serves as a drop-in replacement. It also replaces older e5551/T5551 chips while offering enhanced configurability and security features.","q":"Is the T5577 compatible with T5557 chips?"},{"a":"The T5577 provides 32-bit password protection, blockwise write protection using lock bits, One-Time-Programmable (OTP) functionality to prevent further modifications, and Answer-On-Request (AOR) mode for anti-collision in multi-tag environments.","q":"What security features does the T5577 offer?"},{"a":"The ATA5577C operates in the LF RFID frequency range of 100 kHz to 150 kHz, with typical operation at 125 kHz or 134 kHz depending on the application and regional standards.","q":"What frequency range does the ATA5577C operate at?"},{"a":"Yes, the T5577 is commonly used for cloning LF access control cards because it can emulate EM4100, HID Prox, and other proprietary formats through its configurable modulation and data encoding options. Its rewritable memory allows multiple programming cycles.","q":"Can the T5577 be used for cloning access control cards?"}],"standards":["iso-11784-11785"],"alternatives":["6fbf8d09-eab5-4645-a4ff-d46e5193497f","de787ff0-5b24-47b3-b28b-3d404e2eda36","c322b9c5-6191-4fbf-a65e-2a4b8065da01"],"no_direct_competitor":false,"long_form_html":null,"og_image_url":null,"canonical_url":"https://rfid-datasheet.com/chip/t5577-ata5577c"}}