EM4205 / EM4305 vs HITAG µ
Compare EM4205/EM4305 (512-bit fixed) vs HITAG µ (128/512/1760-bit variants) for LF 125 kHz RFID. Protocol, anti-collision, UID length, and password protection differences.
Side-by-side specs
Frequency
- EM4205 / EM4305
- 125 kHz (100 to 150 kHz range)
- HITAG µ
- 100-150 kHz (LF)
Protocol
- EM4205 / EM4305
- ISO 11784 / 11785 Standard Compliant, compatible with EM4469/EM4569 communication protocol
- HITAG µ
- ISO 11784, ISO 11785 (Animal ID); designed for ISO/IEC 14223; Reader Talks First (RTF) with anti-collision, Transponder Talks First (TTF)
Memory
- EM4205 / EM4305
- 512 bit EEPROM organized in 16 words of 32 bit (288 bits user free in words 5-13), 32 bit unique identifier (UID), 32 bit password
- HITAG µ
- HITAG µ: 128 bits total (4 blocks); HITAG µ Advanced: 512 bits (16 blocks); HITAG µ Advanced+: 1760 bits (55 blocks). Up to 10,000 erase/write cycles, 10 years data retention
Interface
- EM4205 / EM4305
- RF (contactless)
- HITAG µ
- RF contactless (inductive coupling); integrated resonance capacitor 210 pF ±3% or 280 pF ±5%
Temp Range
- EM4205 / EM4305
- -40°C to +85°C
- HITAG µ
- -40°C to +85°C (junction), -55°C to +125°C (storage)
Form Factor
- EM4205 / EM4305
- EMDFN02 (2.2 x 1.78 x 0.76 mm), EMDFN403 (1.1 x 1.4 x 0.46 mm), die/wafer form available
- HITAG µ
- Sawn gold-bumped 8" wafer (550×550 µm die), HVSON2 (SOT899-1, 3×2×0.85 mm), SOT-1122 (XSON3, 1×1.45×0.5 mm)
Security
- EM4205 / EM4305
- 32 bit password read and write protection, lock feature converts EEPROM words into read-only
- HITAG µ
- 48-bit Unique Identification Number (UID); 32-bit password with memory lock functionality and password-protected read/write regions
| Spec | EM4205 / EM4305 | HITAG µ |
|---|---|---|
| Frequency | 125 kHz (100 to 150 kHz range) | 100-150 kHz (LF) |
| Protocol | ISO 11784 / 11785 Standard Compliant, compatible with EM4469/EM4569 communication protocol | ISO 11784, ISO 11785 (Animal ID); designed for ISO/IEC 14223; Reader Talks First (RTF) with anti-collision, Transponder Talks First (TTF) |
| Memory | 512 bit EEPROM organized in 16 words of 32 bit (288 bits user free in words 5-13), 32 bit unique identifier (UID), 32 bit password | HITAG µ: 128 bits total (4 blocks); HITAG µ Advanced: 512 bits (16 blocks); HITAG µ Advanced+: 1760 bits (55 blocks). Up to 10,000 erase/write cycles, 10 years data retention |
| Interface | RF (contactless) | RF contactless (inductive coupling); integrated resonance capacitor 210 pF ±3% or 280 pF ±5% |
| Temp Range | -40°C to +85°C | -40°C to +85°C (junction), -55°C to +125°C (storage) |
| Form Factor | EMDFN02 (2.2 x 1.78 x 0.76 mm), EMDFN403 (1.1 x 1.4 x 0.46 mm), die/wafer form available | Sawn gold-bumped 8" wafer (550×550 µm die), HVSON2 (SOT899-1, 3×2×0.85 mm), SOT-1122 (XSON3, 1×1.45×0.5 mm) |
| Security | 32 bit password read and write protection, lock feature converts EEPROM words into read-only | 48-bit Unique Identification Number (UID); 32-bit password with memory lock functionality and password-protected read/write regions |
Verdict
Choose the EM4205 / EM4305 if you need a standardized 512-bit (64 bytes) read/write transponder with 288 bits (36 bytes) of user memory for general-purpose applications requiring ISO 11784/11785 compliance. This chip provides a 32-bit unique identifier and 32-bit password protection for both read and write operations, with the ability to permanently lock EEPROM words into read-only mode. It operates across the full 100-150 kHz LF range and maintains protocol compatibility with EM4469/EM4569 systems, making it suitable for access control, animal identification, and basic data logging where a single memory configuration suffices and anti-collision is not required.
Choose the HITAG µ if you need scalable memory options across three variants (128-bit, 512-bit, or 1760-bit configurations) with advanced features like Reader Talks First anti-collision support and integrated resonance capacitors (210 pF ±3% or 280 pF ±5%). The HITAG µ family offers a longer 48-bit Unique Identification Number compared to the EM4205's 32-bit UID, providing better uniqueness for large deployments. It supports both ISO 11784/11785 and is designed for ISO/IEC 14223 and ISO 18000-2, with dual-mode operation (Reader Talks First with anti-collision and Transponder Talks First). The 32-bit password with configurable memory lock and password-protected regions, combined with up to 10,000 erase/write cycles and 10-year data retention, makes it ideal for applications requiring flexible memory sizes, anti-collision in multi-tag environments, or compact designs benefiting from integrated capacitors.
FAQ
What is the memory difference between EM4305 and HITAG µ?
The EM4305 has a fixed 512 bits (64 bytes) with 288 bits user-accessible. HITAG µ comes in three variants: 128 bits (4 blocks), 512 bits (16 blocks), or 1760 bits (55 blocks), allowing you to select capacity based on application needs.
Does EM4305 or HITAG µ support anti-collision for multiple tags?
HITAG µ supports Reader Talks First (RTF) mode with anti-collision capability, allowing multiple tags to be read simultaneously. The EM4305 does not specify anti-collision support and is designed for single-tag read environments.
Which chip has better unique identification for large deployments?
HITAG µ provides a 48-bit UID offering 281 trillion unique combinations, while EM4305 has a 32-bit UID with 4.3 billion combinations. The longer UID in HITAG µ reduces collision risk in large-scale deployments.
Sourcing EM4205 / EM4305 or HITAG µ in volume?
Roxtron builds custom RFID and NFC products around both EM4205 / EM4305 and HITAG µ. Tell us your project — quantities, form factor, timeline — and we'll come back within 24 hours with pricing and lead times.