How the STMicro SRIX4K / ST25TB04K (ISO 14443B) works
The STMicro SRIX4K / ST25TB04K (ISO 14443B) is a 13.56 MHz high-frequency contactless credential read over the ISO/IEC 14443 air interface. The STMicro SRIX4K / ST25TB04K (ISO 14443B) is genuine STMicroelectronics silicon — data structure ISO 14443B; 4Kbit; transport/ticketing — the same chip platform the major lock, transit, hotel and payment systems specify.
We stock it as an encodable blank, supplied unprogrammed or pre-encoded to your specification, so your access-control system, card bureau or application writes it with your own data and keys — exactly as you would chips ordered through the STMicroelectronics distribution channel, at a fraction of the price. There is nothing aftermarket about the chip itself; what we add is sourcing, encoding and bulk availability.
Whether you need a handful of spares or a bulk run for a facility, transit programme or NFC project, tell us the exact STMicroelectronics chip and quantity and we confirm the part before production. Security ID Systems supplies genuine STMicroelectronics silicon and is independent and not affiliated with STMicroelectronics.
Also known as
SRIX4K · ST25TB04K · SRI4K · M067 · M110
STMicroelectronics and all other brand and product names are trademarks of their respective owners. Security ID Systems is an independent manufacturer and supplier of compatible access-control credentials and is not affiliated with, authorized by, sponsored by, or endorsed by these companies. Brand and format names are used only to identify the systems our products are compatible with. MIFARE and DESFire are registered trademarks of NXP B.V.