How the compatible Onity HT24 / Advance / Trillium (Mifare Classic 1K) works
The Onity HT24 / Advance / Trillium (Mifare Classic 1K) is a 13.56 MHz high-frequency contactless credential read over the ISO/IEC 14443 air interface. Its data structure is Onity proprietary sector encoding on Mifare Classic 1K (open system); Trillium adds Plus. When you present a credential, the reader decodes that exact structure and passes it to your access-control panel as a card number it recognises.
We build the compatible Onity HT24 / Advance / Trillium (Mifare Classic 1K) by encoding the identical data structure onto a programmable Genuine NXP MIFARE Ultralight / Classic 1K chip. Once written, the reader cannot tell the difference between our credential and the original — it presents the same bits, the same facility code, and the same card number. That is what "compatible by specification" means: not a generic look-alike, but a credential engineered to read exactly as the original does.
To order, tell us the part number or format printed on your existing Onity card, and our specialists confirm the encoding before anything ships. Bulk and reorder quantities are welcome — pricing is a fraction of OEM list, and every credential is verified to read on your existing equipment.
Also known as
Onity · Onity HT · Onity HT24 · Onity Advance · Trillium · DirectKey
Onity 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.