Microchip Technology ATA5577M1250C-DDT

Overview

ATA5577M1250C-DDT from Microchip Technology (formerly Atmel) is a contactless 125-kHz read/write RFID identification IC with 363-bit EEPROM, load modulation uplink, OOK pulse-interval downlink, and on-chip antenna capacitor trimming. It serves as a transponder tag in LF RFID systems for access control, animal identification, and waste management.

For engineers reviewing the ATA5577M1250C-DDT datasheet, ATA5577M1250C-DDT pinout, ATA5577M1250C-DDT application, or ATA5577M1250C-DDT equivalent, key selection criteria include ISO/IEC 11784/11785 configurability, 11-block EEPROM architecture with per-block lock bits, RF frequency tolerance (100–150 kHz), and compatibility with T5557/ATA5567 command sets.

Technical Context

The ATA5577M1250C-DDT integrates an analog front end with rectifier, clock extractor, field-gap detector, and switchable load modulator between Coil1 and Coil2. Its controller executes block-wise EEPROM read/write, manages mode and option registers, and enforces lock-bit protection per 33-bit block.

Data-rate generation supports binary-programmable rates from RF/2 to RF/128 and fixed Basic mode rates (RF/8 through RF/128). The HV generator enables EEPROM programming via internal charge pump, while POR ensures stable initialization above Vcoil threshold.

Key Specifications

Pinout & Package

ATA5577M1250C-DDT is offered in a bare die format with two terminal pads: Coil1 and Coil2. No bond wire or package - designed for direct coil bonding or flip-chip assembly onto antenna substrates. Pad dimensions are 200 µm × 400 µm (ATA5577M2 variant), optimized for high-Q antenna integration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LF RFID transponder applications.

Compared with T5557 and ATA5567, the ATA5577M1250C-DDT delivers enhanced design flexibility through integrated capacitor trimming, broader ISO compliance, and improved thermal stability - making it the preferred choice for new deployments requiring certification, longevity, or antenna integration simplicity.

Availability

ATA5577M1250C-DDT is available at Aetrix Electronics and suitable for access control systems, animal identification programs, and waste management infrastructure requiring stable component supply, long-term data retention, and global LF RFID interoperability.

Supply support for ATA5577M1250C-DDT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology acquired Atmel in 2016 and maintains its RFID product portfolio, delivering secure, low-power wireless identification solutions for industrial, automotive, and IoT applications.

The ATA5577 series was developed as a high-reliability, contactless IDIC for 125–134 kHz transponder tags - targeting applications demanding EEPROM security, field-powered operation, and regulatory compliance in harsh environments.

FAQ

What is the primary function of the ATA5577M1250C-DDT in an RFID system?

The ATA5577M1250C-DDT functions as a contactless, field-powered transponder IC that stores and exchanges identification data via inductive coupling at 125–150 kHz. It receives power and commands from a reader through its Coil1/Coil2 interface, executes EEPROM read/write operations, and transmits data back using load modulation. Its role is strictly as a passive tag - not a reader or controller - and it operates without an onboard power source.

Does the ATA5577M1250C-DDT support ISO/IEC 11784 and 11785 standards out of the box?

The ATA5577M1250C-DDT is configurable for ISO/IEC 11784/11785 compliance via its mode register settings, but it does not ship pre-configured to those standards. Users must program appropriate modulation type (e.g., FSK or NRZ), data rate, and frame format into Block 0 of EEPROM. Atmel-provided application notes detail the exact bit patterns required to achieve full certification readiness for animal ID applications.

How many times can the EEPROM in the ATA5577M1250C-DDT be rewritten?

The ATA5577M1250C-DDT EEPROM is rated for 100,000 erase/write cycles per block under standard conditions (Tamb = +25°C). This endurance applies to full-block programming - including the lock bit - and is guaranteed based on initial product qualification data. Endurance may vary slightly depending on operating temperature and coil drive level, but remains sufficient for multi-year deployment in typical access control or asset tracking use cases.

What is the significance of the "M1250C-DDT" suffix in the ATA5577M1250C-DDT part number?

The "M1250C-DDT" suffix identifies a specific die variant within the ATA5577 family: M1250 denotes the 125 kHz nominal operating frequency version with on-chip capacitor option C (Cr ≈ 330 pF), and DDT indicates the die form factor with 200 µm × 400 µm bonding pads optimized for direct coil attachment. This distinguishes it from M1 (100 µm × 100 µm for wire bonding) and other capacitor mask options (A–E).

Can the ATA5577M1250C-DDT replace the T5551 or e5551 in existing designs?

The ATA5577M1250C-DDT is documented as a replacement for e5551/T5551 in most common operation modes, sharing command compatibility and register layout with T5557/ATA5567. However, functional equivalence requires verification of modulation scheme, data rate, and lock-bit behavior in the target reader environment. Atmel explicitly states that correct functionality must be evaluated and proved - no drop-in guarantee is provided for legacy e5551 systems.