ATA5577M3 vs HITAG S

Compare Microchip ATA5577M3 and NXP HITAG S LF RFID chips: multi-format emulation vs. secure authentication, 363-bit vs. 256/2048-bit memory, use cases.

Side-by-side specs

Frequency

ATA5577M3: 125 kHz
HITAG S: 100 kHz to 150 kHz

Protocol

ATA5577M3: EM4100, EM4102, T5557, Hitag, Indala, and other LF formats
HITAG S: HITAG proprietary protocol (based on HITAG 1), ISO 11784/85 Animal ID compliant, ISO 14223/ISO 18000-2 targeted

Memory

ATA5577M3: 363 bits total (330 bits user programmable)
HITAG S: 256 bit (HITAG S256) or 2048 bit (HITAG S2048) total memory, organized in 64 pages of 32 bits each, up to 100000 erase/write cycles, 10 years data retention

Interface

ATA5577M3: RF (contactless)
HITAG S: RF (contactless), integrated resonance capacitor 210 pF ±5%

Temp Range

ATA5577M3: -40°C to +85°C
HITAG S: -25°C to +85°C (junction temperature)

Form Factor

ATA5577M3: Wafer, SO8, TSSOP8
HITAG S: Sawn gold-bumped 8" wafer, sawn gold-megabumped 8" wafer, MOA4 (PLLMC contactless chip card module SOT500-2), HVSON2 (3×2×0.85 mm SOT899-1)

Security

ATA5577M3: 32-bit password protection for read/write operations
HITAG S: 32-bit Unique Identification Number (UID), 48-bit secret key based encrypted authentication, secure memory lock functionality, plain mode and authentication mode operation

Spec	ATA5577M3	HITAG S
Frequency	125 kHz	100 kHz to 150 kHz
Protocol	EM4100, EM4102, T5557, Hitag, Indala, and other LF formats	HITAG proprietary protocol (based on HITAG 1), ISO 11784/85 Animal ID compliant, ISO 14223/ISO 18000-2 targeted
Memory	363 bits total (330 bits user programmable)	256 bit (HITAG S256) or 2048 bit (HITAG S2048) total memory, organized in 64 pages of 32 bits each, up to 100000 erase/write cycles, 10 years data retention
Interface	RF (contactless)	RF (contactless), integrated resonance capacitor 210 pF ±5%
Temp Range	-40°C to +85°C	-25°C to +85°C (junction temperature)
Form Factor	Wafer, SO8, TSSOP8	Sawn gold-bumped 8" wafer, sawn gold-megabumped 8" wafer, MOA4 (PLLMC contactless chip card module SOT500-2), HVSON2 (3×2×0.85 mm SOT899-1)
Security	32-bit password protection for read/write operations	32-bit Unique Identification Number (UID), 48-bit secret key based encrypted authentication, secure memory lock functionality, plain mode and authentication mode operation

Verdict

Choose the ATA5577M3 if you need maximum compatibility across legacy LF RFID systems or want a single chip that can emulate multiple formats. With 363 bits total memory (330 bits user-programmable), it supports EM4100, EM4102, T5557, Hitag, Indala, and other LF formats at 125 kHz, making it ideal for access control retrofits, universal key fobs, or scenarios where you must integrate with existing readers of unknown or mixed protocols. The 32-bit password protection provides basic read/write security suitable for non-critical applications. Its multi-format capability means you can reconfigure the same chip for different systems, reducing inventory complexity when supporting multiple facilities or client installations with diverse reader infrastructure. Choose the HITAG S if you require cryptographic security, higher memory capacity, or compliance with specific ISO standards for animal identification and industrial applications. Operating across 100-150 kHz, it offers either 256-bit or 2048-bit memory configurations (64 pages of 32 bits each) with 100,000 erase/write cycles and 10-year data retention. The 48-bit secret key encrypted authentication and dual-mode operation (plain and authentication modes) provide substantially stronger security than simple password protection, essential for automotive immobilizers, secure asset tracking, or payment systems. The integrated 210 pF resonance capacitor simplifies antenna design. ISO 11784/85 compliance makes it the required choice for animal identification systems, while targeting ISO 14223 and ISO 18000-2 ensures compatibility with standardized industrial and logistics applications where HITAG proprietary protocol is established.

FAQ

What is the memory difference between ATA5577M3 and HITAG S?

The ATA5577M3 offers 363 bits total (330 bits user-programmable), while HITAG S provides either 256 bits (S256) or 2048 bits (S2048) organized in 64 pages of 32 bits. HITAG S2048 provides approximately 5.6 times more memory than the ATA5577M3.

Which chip has better security features for access control?

HITAG S offers superior security with 48-bit secret key encrypted authentication and dual-mode operation (plain/authentication), compared to the ATA5577M3's basic 32-bit password protection. For applications requiring cryptographic authentication such as automotive or high-security access control, HITAG S is the stronger choice.

Can both chips work with existing EM4100 readers?

The ATA5577M3 can emulate EM4100 format along with multiple other LF protocols, making it compatible with EM4100 readers when configured appropriately. HITAG S uses proprietary HITAG protocol and ISO standards, so it cannot emulate EM4100 and requires HITAG-compatible readers.

Sourcing ATA5577M3 or HITAG S in volume?

Roxtron builds custom RFID and NFC products around both ATA5577M3 and HITAG S. Tell us your project — quantities, form factor, timeline — and we'll come back within 24 hours with pricing and lead times.