HITAG S vs T5577 / ATA5577C
Compare HITAG S and T5577 LF RFID chips. HITAG S offers 256-2048 bits with proprietary security, while T5577 provides 363 bits with multi-protocol emulation.
Side-by-side specs
Frequency
- HITAG S
- 100 kHz to 150 kHz
- T5577 / ATA5577C
- 100 kHz to 150 kHz (LF RFID, typically 125 kHz or 134 kHz)
Protocol
- HITAG S
- HITAG proprietary protocol (based on HITAG 1), ISO 11784/85 Animal ID compliant, ISO 14223/ISO 18000-2 targeted
- T5577 / ATA5577C
- Configurable for ISO/IEC 11784/785 compatibility, compatible with T5557/ATA5567, replacement for e5551/T5551
Memory
- 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
- T5577 / ATA5577C
- 363 bits EEPROM (11 blocks × 33 bits: 7 blocks user memory + password, 2 blocks unique ID, 1 configuration block, 1 option block)
Interface
- HITAG S
- RF (contactless), integrated resonance capacitor 210 pF ±5%
- T5577 / ATA5577C
- RF (contactless), dual coil terminals (Coil 1/Coil 2) for power supply and bidirectional communication
Temp Range
- HITAG S
- -25°C to +85°C (junction temperature)
- T5577 / ATA5577C
- -40°C to +85°C (operating ambient temperature)
Form Factor
- 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)
- T5577 / ATA5577C
- 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…
Security
- 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
- T5577 / ATA5577C
- 32-bit password mode, blockwise write protection (lock bits), One-Time-Programmable (OTP) functionality, Answer-On-Request (AOR) mode for anti-collision
| Spec | HITAG S | T5577 / ATA5577C |
|---|---|---|
| Frequency | 100 kHz to 150 kHz | 100 kHz to 150 kHz (LF RFID, typically 125 kHz or 134 kHz) |
| Protocol | HITAG proprietary protocol (based on HITAG 1), ISO 11784/85 Animal ID compliant, ISO 14223/ISO 18000-2 targeted | Configurable for ISO/IEC 11784/785 compatibility, compatible with T5557/ATA5567, replacement for e5551/T5551 |
| Memory | 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 | 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), integrated resonance capacitor 210 pF ±5% | RF (contactless), dual coil terminals (Coil 1/Coil 2) for power supply and bidirectional communication |
| Temp Range | -25°C to +85°C (junction temperature) | -40°C to +85°C (operating ambient temperature) |
| Form Factor | 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) | 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… |
| Security | 32-bit Unique Identification Number (UID), 48-bit secret key based encrypted authentication, secure memory lock functionality, plain mode and authentication mode operation | 32-bit password mode, blockwise write protection (lock bits), One-Time-Programmable (OTP) functionality, Answer-On-Request (AOR) mode for anti-collision |
Verdict
Choose HITAG S if you need a secure, single-purpose LF RFID solution with dedicated authentication mechanisms and larger memory capacity. The HITAG S256 provides 256 bits (32 bytes) while the HITAG S2048 offers 2048 bits (256 bytes) organized in 64 pages of 32 bits each, significantly more than the T5577's 363 bits (approximately 45 bytes). The HITAG S implements 48-bit secret key based encrypted authentication with both plain mode and authentication mode operation, making it suitable for automotive access control and industrial applications requiring cryptographic security. It is compliant with ISO 11784/85 Animal ID and targeted for ISO 14223/ISO 18000-2, providing standardized animal tracking capabilities. The integrated 210 pF ±5% resonance capacitor simplifies antenna design, and the chip supports up to 100,000 erase/write cycles with 10-year data retention. The proprietary HITAG protocol based on HITAG 1 ensures consistent security across NXP's ecosystem but locks you into a single vendor architecture.
Choose T5577 / ATA5577C if you need a flexible, multi-protocol emulator capable of replacing or cloning various LF RFID formats in access control, cloning, and compatibility-critical deployments. The T5577 provides 363 bits of EEPROM organized as 11 blocks of 33 bits (7 blocks user memory plus password, 2 blocks unique ID, 1 configuration block, 1 option block), with configurable operation to emulate EM4100, HID, and other common 125 kHz formats. It maintains compatibility with ISO/IEC 11784/785 and serves as a drop-in replacement for legacy chips like e5551/T5551 and T5557/ATA5567. Security features include 32-bit password mode, blockwise write protection with lock bits, One-Time-Programmable (OTP) functionality, and Answer-On-Request (AOR) mode for anti-collision scenarios. The dual coil terminals simplify integration into existing LF reader infrastructure. While it lacks the cryptographic authentication of HITAG S, the T5577's configurability makes it ideal for system integrators supporting multiple customer standards or migrating between RFID formats without replacing reader hardware.
FAQ
What is the memory difference between HITAG S and T5577?
HITAG S offers 256 bits (32 bytes) in the S256 variant or 2048 bits (256 bytes) in the S2048 variant, organized in 64 pages of 32 bits each. The T5577 provides 363 bits (approximately 45 bytes) organized as 11 blocks of 33 bits, with 7 blocks available for user memory.
Can T5577 emulate HITAG S or vice versa?
No, the T5577 cannot emulate HITAG S. HITAG S uses a proprietary protocol based on HITAG 1 with encrypted authentication, while T5577 is designed to emulate simpler formats like EM4100 and HID but does not support HITAG's cryptographic protocols.
Which chip offers better security features?
HITAG S provides stronger security with 48-bit secret key based encrypted authentication and dual operation modes (plain and authentication). The T5577 offers basic 32-bit password protection, blockwise write protection, and OTP functionality, but lacks cryptographic authentication.
Sourcing HITAG S or T5577 / ATA5577C in volume?
Roxtron builds custom RFID and NFC products around both HITAG S and T5577 / ATA5577C. Tell us your project — quantities, form factor, timeline — and we'll come back within 24 hours with pricing and lead times.