Description
T5577 card is a highly versatile, cost-effective RFID solution for low-frequency applications. Its rewritable memory and compatibility with older RFID systems make it an excellent choice for access control, hotel key cards, and parking systems. While it lacks advanced security features, it remains a reliable and affordable option for low-security environments.
The T5577 chip is an RFID transponder chip developed by Atmel Corporation, a semiconductor company based in the United States that specialized in microcontrollers, non-volatile memory, and RFID technologies. Atmel, founded in 1984, was well-regarded for its innovations in low-power and embedded systems. In 2016, Atmel was acquired by Microchip Technology, a leading global provider of microcontroller and semiconductor solutions.
The T5577 chip, conceived as part of Atmel’s RFID product line, was designed to provide a flexible, low-cost, and reprogrammable solution for low-frequency (125 kHz) RFID applications. It became popular for its ability to emulate multiple protocols, making it one of the most versatile chips in the low-frequency RFID domain.
Purpose of T5577 Development
Compatibility with Existing Systems:
Many legacy RFID systems relied on earlier low-frequency chips, such as the EM4100 and HID Prox. The T5577 was designed to emulate these protocols, allowing it to serve as a drop-in replacement.
Rewritability:
The T5577 introduced rewritable memory, enabling users to reprogram the chip multiple times for different applications, unlike earlier read-only chips.
Cost-Effectiveness:
The chip was developed as a cost-efficient solution for high-volume applications, such as access control, parking systems, and identification cards.
Versatility:
With 330 bits of memory and the ability to support multiple protocols, the T5577 was designed to cater to diverse applications without requiring significant hardware changes.
Key Milestones in T5577 Development
Early 2000s – Release of T5557:
The T5557, a predecessor of the T5577, was one of Atmel’s first chips in this category. It gained traction as a programmable and versatile low-frequency RFID chip.
Introduction of T5577:
The T5577 was introduced as an improvement over the T5557, with enhanced functionality and better compatibility with existing RFID protocols.
Adoption Across Industries:
The T5577 quickly gained popularity in industries such as access control, hospitality, and parking systems due to its flexibility and affordability.
Integration into the Microchip Portfolio:
After Atmel’s acquisition by Microchip Technology in 2016, the T5577 became part of Microchip’s extensive RFID product line.
Legacy of the T5577 card
The T5577 remains widely used today due to its backward compatibility with legacy systems and affordability. Despite the rise of high-frequency (13.56 MHz) RFID technologies like MIFARE, the T5577 continues to meet the needs of applications where low-frequency systems are still in operation. Its ability to emulate older chips, combined with its rewritability, ensures its relevance in RFID markets worldwide.
The Surface Crafts of Printazble T5577 card

The Package of T5577 card
