EM4102 (EM Marin 64-bit Read-Only Variant) Compatible Cards & Fobs
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.
The EM4102 shares identical electrical and protocol specifications with the EM4100 — same 64-bit ROM, same ASK modulation, same Manchester encoding, and same reader compatibility — making it a transparent substitute wherever EM4100 credentials are deployed. American Key Cards supplies EM4102-compatible clamshell cards, ISO PVC cards, and key fobs in your required facility-code range, encoded and ready to install without reader re-programming.
EM4102 (EM Marin 64-bit Read-Only Variant) specifications
- Brand / OEM
- EM Microelectronic-Marin SA
- Technology
- Passive RFID proximity
- Frequency
- 125 kHz
- Chip
- EM4102 CMOS read-only IC; functionally identical to EM4100; 64-bit laser-programmed ROM; ASK/OOK modulation; Manchester encoding; full protocol compatibility with EM4100 readers
- Bit formats
- 64-bit EM4100/EM4102 protocol (identical transmission format): 9 start bits + 40 data bits + 14 parity bits + 1 stop bit
- OEM part numbers
- EM4102, H4102 (compatible clone IC)
Our compatible EM4102 (EM Marin 64-bit Read-Only Variant) 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 EM4102 (EM Marin 64-bit Read-Only Variant) cards be copied?
EM4102 (EM Marin 64-bit Read-Only Variant) 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.
EM4102 carries the same security profile as EM4100 — unencrypted fixed 64-bit ID with no clone protection. Suitable only for low-security or convenience applications. Upgrade to 13.56 MHz smart credentials for environments requiring clone resistance.
Where EM4102 (EM Marin 64-bit Read-Only Variant) is used
- Legacy EM4100/EM4102 reader system replacements
- Time-and-attendance and visitor management
- Basic building access in residential and light commercial
- Parking and recreational facility entry
Compatible readers
Related formats
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View compatible cardsAWID 26-Bit
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Indala FlexPass 26-bit is a 125 kHz proximity card format using PSK modulation — architecturally distinct from HID Prox — with Wiegand output supporting 255 facility codes and up to 65,535 card numbers per site.
View compatible cardsEM4102 (EM Marin 64-bit Read-Only Variant) — FAQ
What is the difference between EM4100 and EM4102?
Functionally, EM4102 and EM4100 are identical: both are 64-bit read-only 125 kHz chips using the same ASK/Manchester encoding protocol. EM4102 is an alternate production variant — all EM4100 readers also read EM4102 cards without any configuration change.
Will your EM4102 cards work on my existing EM4100 system?
Yes. The EM4102 and EM4100 share the exact same 64-bit communication protocol; they are interchangeable at the reader level. Our EM4102-compatible cards are drop-in replacements for any EM4100 system.
Are EM4102 cards cloneable?
Yes — like all unencrypted 125 kHz proximity cards, EM4102 credentials can be read with a Proxmark3 or basic RFID reader and copied to a T5577 writable card. These formats are suitable only for low-security deployments.