M750 vs UCODE 9

Impinj M750 offers 64 bits user memory and cryptographic authentication. NXP UCODE 9 provides faster read rates and ECC error correction for dense retail.

Side-by-side specs

Frequency

M750: 860–960 MHz
UCODE 9: 840–960 MHz (UHF)

Protocol

M750: EPC Class 1 Gen 2 (ISO/IEC 18000-63), RAIN RFID
UCODE 9: EPC Gen2v2.1 (EPCglobal Class-1 Generation-2 UHF RFID)

Memory

M750: 128 bits EPC, 32 bits TID, 32 bits access password, 32 bits kill password, 64 bits user memory
UCODE 9: 96-bit EPC, 96-bit TID (48-bit unique serial number), 32-bit kill password

Interface

M750: RF (contactless UHF backscatter)
UCODE 9: RF (contactless)

Temp Range

M750: -40°C to +85°C
UCODE 9: -40°C to +85°C

Form Factor

M750: Silicon die for tag inlay integration
UCODE 9: Wafer (12-inch, 120 µm thick, 0.43 mm × 0.38 mm die, conventional or plasma dicing, large pads)

Security

M750: 32-bit access password, 32-bit kill password, cryptographic authentication, Impinj BlockPermalock
UCODE 9: 32-bit kill password, Memory Safeguard (ECC, parity check), permalock

Spec	M750	UCODE 9
Frequency	860–960 MHz	840–960 MHz (UHF)
Protocol	EPC Class 1 Gen 2 (ISO/IEC 18000-63), RAIN RFID	EPC Gen2v2.1 (EPCglobal Class-1 Generation-2 UHF RFID)
Memory	128 bits EPC, 32 bits TID, 32 bits access password, 32 bits kill password, 64 bits user memory	96-bit EPC, 96-bit TID (48-bit unique serial number), 32-bit kill password
Interface	RF (contactless UHF backscatter)	RF (contactless)
Temp Range	-40°C to +85°C	-40°C to +85°C
Form Factor	Silicon die for tag inlay integration	Wafer (12-inch, 120 µm thick, 0.43 mm × 0.38 mm die, conventional or plasma dicing, large pads)
Security	32-bit access password, 32-bit kill password, cryptographic authentication, Impinj BlockPermalock	32-bit kill password, Memory Safeguard (ECC, parity check), permalock

Verdict

Choose the Impinj M750 if you need cryptographic authentication, additional user memory, or advanced security controls. The M750 provides 64 bits of user memory versus none in the UCODE 9, allowing you to store application-specific data beyond the EPC identifier. It implements cryptographic authentication through its authentication protocol support, which the UCODE 9 lacks entirely. Both chips provide a 32-bit kill password, but the M750 adds a 32-bit access password for read/write protection and includes Impinj BlockPermalock for granular memory locking. The M750 also offers a 128-bit EPC memory bank compared to the UCODE 9's 96-bit EPC, providing more capacity for longer identifiers. Both operate across the UHF RFID band (860–960 MHz for M750, 840–960 MHz for UCODE 9) and support EPC Gen2 protocols, though UCODE 9 specifies Gen2v2.1 compliance while M750 cites EPC Class 1 Gen 2. Choose the NXP UCODE 9 if read speed and data integrity are priorities in high-density retail environments. The UCODE 9 is explicitly designed for the fastest read rates in dense tag populations, making it optimal for rapid inventory scanning where hundreds of items pass readers simultaneously. It includes Memory Safeguard technology with error correction code (ECC) and parity checking to ensure data integrity, features not specified in the M750 documentation. The UCODE 9 provides a 96-bit TID with a 48-bit unique serial number for item authentication, compared to the M750's 32-bit TID. The UCODE 9's slightly broader frequency range (840–960 MHz versus 860–960 MHz) may offer better compatibility with certain regional deployments. However, you sacrifice user memory entirely, receive no access password protection, and lose cryptographic authentication capabilities. For basic retail tagging where speed and reliability matter more than advanced security or custom data storage, the UCODE 9 delivers purpose-built performance.

FAQ

What is the memory difference between Impinj M750 and NXP UCODE 9?

The Impinj M750 has 128 bits of EPC memory and 64 bits of user memory, while the NXP UCODE 9 has 96 bits of EPC memory and no user memory. The M750 provides 32 bits of TID compared to the UCODE 9's 96-bit TID with 48-bit unique serial number.

Which UHF RFID chip has better security features?

The Impinj M750 offers stronger security with cryptographic authentication, a 32-bit access password, a 32-bit kill password, and BlockPermalock. The NXP UCODE 9 only provides a 32-bit kill password and permalock functionality, but includes Memory Safeguard with ECC for data integrity.

Can NXP UCODE 9 read faster than Impinj M750?

Yes, the NXP UCODE 9 is specifically designed for the fastest read rates in dense retail environments with high tag populations. The Impinj M750 is positioned for demanding applications requiring advanced features rather than maximum read speed.

Sourcing M750 or UCODE 9 in volume?

Roxtron builds custom RFID and NFC products around both M750 and UCODE 9. Tell us your project — quantities, form factor, timeline — and we'll come back within 24 hours with pricing and lead times.