EM4200 (EM Marin 128-bit Enhanced Read-Only) Compatible Cards & Fobs
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.
Designed as a drop-in upgrade for EM4100/EM4102 deployments, the EM4200 adds a larger antenna resonance capacitor and extended 96/128-bit ROM while retaining the identical ASK/Manchester encoding that every EM reader understands. American Key Cards supplies EM4200-compatible credentials in clamshell, ISO, and key-fob formats, pre-encoded to your facility range, with no reader modifications required when replacing EM4100 stock.
EM4200 (EM Marin 128-bit Enhanced Read-Only) specifications
- Brand / OEM
- EM Microelectronic-Marin SA
- Technology
- Passive RFID proximity
- Frequency
- 125 kHz
- Chip
- EM4200 CMOS read-only IC; 128-bit laser-programmed ROM (selectable 64/96/128-bit output); enhanced resonance capacitor (210 pF or 250 pF options) for extended read range vs EM4100; ASK modulation; Manchester encoding; ISO 11784/11785 compatible
- Bit formats
- 128-bit EM4200 protocol (backward-compatible EM4100/EM4102 output mode selectable at 64, 96, or 128 bits), ISO 11784/11785 FDX-B animal-ID compatible in extended mode
- OEM part numbers
- EM4200
Our compatible EM4200 (EM Marin 128-bit Enhanced Read-Only) credentials
American Key Cards manufactures non-OEM credentials engineered to work with your existing EM Microelectronic-Marin readers — no hardware changes, encoded to your facility code and card-number range.
Can EM4200 (EM Marin 128-bit Enhanced Read-Only) cards be copied?
EM4200 (EM Marin 128-bit Enhanced Read-Only) is an open format, so a compatible card can be produced from your facility code and card number. We don't copy individual cards on request — we manufacture new, correctly-encoded credentials for systems you own or manage.
EM4200 is a read-only chip with no encryption — its ID can be captured and cloned with Proxmark3 or T5577. It provides longer read range than EM4100 but the same zero cryptographic protection. For clone-resistant access control, upgrade to 13.56 MHz smart credentials.
Where EM4200 (EM Marin 128-bit Enhanced Read-Only) is used
- Upgrade path from EM4100 systems needing extended read range
- Animal and livestock identification (ISO FDX-B mode)
- Basic door access where longer read distance is preferred
- Time-and-attendance and visitor tracking
- Parking and asset management
Compatible readers
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View compatible cardsEM4200 (EM Marin 128-bit Enhanced Read-Only) — FAQ
How does EM4200 differ from EM4100?
The EM4200 was designed by EM Microelectronic to directly replace EM4100/EM4102. It stores up to 128 bits of laser-programmed data versus 64 bits in the EM4100, and uses a larger resonance capacitor for better read range. In 64-bit compatibility mode it reads on all existing EM4100 readers.
Are EM4200 cards backward compatible with EM4100 readers?
Yes. When configured in 64-bit mode, the EM4200 is fully backward compatible with all EM4100 and EM4102 readers. No reader changes or reprogramming are needed.
Can EM4200 cards be cloned?
Yes — the EM4200 transmits an unencrypted fixed ID that is easily captured with a Proxmark3 or RFID copier and written to a T5577 blank card. It offers no cryptographic clone protection.