Magnus-S3 M3D vs EM4325

Compare Magnus-S3 M3D and EM4325 UHF RFID sensor chips. Differences in memory (128 vs 512 bits user), integrated vs external sensors, EPC Gen2 versions.

Side-by-side specs

Frequency

Magnus-S3 M3D: 860–960 MHz
EM4325: 860–960 MHz UHF

Protocol

Magnus-S3 M3D: EPC Class-1 Gen2 v2.0.1, ISO/IEC 18000-6C
EM4325: EPC Class-1 Generation-2, ISO/IEC 18000-6C

Memory

Magnus-S3 M3D: 64-bit TID (read-only), 128-bit EPC, 128-bit user memory, 32-bit kill password
EM4325: 128 bits EPC, 512 bits user memory, 64 bits TID

Interface

Magnus-S3 M3D: RF (passive UHF)
EM4325: RF (contactless), sensor interface for external sensors

Temp Range

Magnus-S3 M3D: -40°C to +125°C (storage); -40°C to +85°C (recommended operating); supports shorter excursions to +125°C
EM4325: -40°C to +85°C

Form Factor

Magnus-S3 M3D: 910 µm × 760 µm bumped die (66 µm bumps); 1.6 mm × 1.6 mm QFN-2
EM4325: Die/wafer for inlay production

Security

Magnus-S3 M3D: 32-bit kill password
EM4325: 32-bit access and kill passwords, EPC Gen2 security features

Spec	Magnus-S3 M3D	EM4325
Frequency	860–960 MHz	860–960 MHz UHF
Protocol	EPC Class-1 Gen2 v2.0.1, ISO/IEC 18000-6C	EPC Class-1 Generation-2, ISO/IEC 18000-6C
Memory	64-bit TID (read-only), 128-bit EPC, 128-bit user memory, 32-bit kill password	128 bits EPC, 512 bits user memory, 64 bits TID
Interface	RF (passive UHF)	RF (contactless), sensor interface for external sensors
Temp Range	-40°C to +125°C (storage); -40°C to +85°C (recommended operating); supports shorter excursions to +125°C	-40°C to +85°C
Form Factor	910 µm × 760 µm bumped die (66 µm bumps); 1.6 mm × 1.6 mm QFN-2	Die/wafer for inlay production
Security	32-bit kill password	32-bit access and kill passwords, EPC Gen2 security features

Verdict

Choose Magnus-S3 M3D if you need integrated sensor monitoring for temperature, moisture, and proximity without external sensor components. This chip operates on EPC Class-1 Gen2 v2.0.1 and ISO/IEC 18000-6C protocols across 860–960 MHz UHF. It provides 128 bits of user memory, 128 bits of EPC memory, and a 64-bit read-only TID. The Magnus-S3 M3D is purpose-built for sensor applications where the sensing elements are embedded in the IC itself, eliminating the need for external sensor integration and simplifying antenna design. Security is limited to a 32-bit kill password. This chip suits applications where built-in environmental monitoring is the primary requirement and moderate user memory is sufficient. Choose EM4325 if you require larger user memory capacity or need flexibility to connect external sensors via a dedicated sensor interface. The EM4325 offers 512 bits of user memory—four times the Magnus-S3 M3D's 128 bits—making it better suited for applications requiring more data storage alongside sensing capabilities. It supports EPC Class-1 Generation-2 and ISO/IEC 18000-6C protocols in the same 860–960 MHz UHF band. The EM4325 provides enhanced security with both 32-bit access and kill passwords plus additional EPC Gen2 security features, offering more protection than the Magnus-S3 M3D's kill-password-only approach. The external sensor interface enables connection to custom or application-specific sensors, providing greater flexibility for specialized sensing requirements in logistics, supply chain monitoring, and industrial applications where you may need sensors not available in integrated form.

FAQ

What is the difference in user memory between Magnus-S3 M3D and EM4325?

The EM4325 provides 512 bits of user memory compared to the Magnus-S3 M3D's 128 bits, offering four times more storage capacity for application data.

Do both chips have integrated temperature sensors?

The Magnus-S3 M3D has integrated sensors for temperature, moisture, and proximity. The EM4325 has a sensor interface for connecting external sensors rather than built-in sensing elements.

Which chip has better security features for UHF RFID applications?

The EM4325 offers superior security with both 32-bit access and kill passwords plus EPC Gen2 security features, while the Magnus-S3 M3D provides only a 32-bit kill password.

Sourcing Magnus-S3 M3D or EM4325 in volume?

Roxtron builds custom RFID and NFC products around both Magnus-S3 M3D and EM4325. Tell us your project — quantities, form factor, timeline — and we'll come back within 24 hours with pricing and lead times.