EM Microelectronic-Marin Compatible Cards & Fobs
EM Microelectronic-Marin is the Swiss semiconductor company behind the EM4100, EM4102, and EM4200 read-only 125 kHz RFID chips that form the basis of the world's most widely deployed low-security proximity standard. American Key Cards supplies compatible EM4100, EM4102, and EM4200 clamshell cards and key fobs pre-encoded to your facility code range for any access control or identification system that speaks the EM protocol.
Supported formats
EM Microelectronic-Marin formats we make compatible cards for
Pick your exact format for specs, OEM part-number equivalents, and a quote. Not sure which you have? Here's how to identify it.
EM4100 (EM Marin 64-bit Read-Only)
EM4100 is the original and most widely deployed 125 kHz read-only proximity standard, using a factory-programmed 64-bit ID transmitted via Manchester-encoded ASK modulation.
View compatible cardsEM4102 (EM Marin 64-bit Read-Only Variant)
EM4102 is a 64-bit read-only 125 kHz proximity variant fully protocol-compatible with EM4100, commonly used as an interchangeable replacement in EM Marin–based access control and identification systems.
View compatible cardsEM4200 (EM Marin 128-bit Enhanced Read-Only)
EM4200 is EM Microelectronic's enhanced successor to EM4100/EM4102, offering up to 128 bits of read-only data and superior read range while remaining fully backward compatible with all EM4100 reader installations.
View compatible cardsNeed EM Microelectronic-Marin cards in volume?
Tell us your EM Microelectronic-Marin format and quantity — we'll quote compatible cards and fobs, encoded to your facility code, usually within one business day.