T5577 / T5557 (125kHz read/write) → EM4305
Cross-reference / replacement · Atmel / Microchip → EM Microelectronics
- Frequency:
- 125 kHz
- Memory:
- 512-bit EEPROM
- Modulation:
- ASK / FSK / PSK
- Data Rate:
- Up to 8 kbps
Compatibility & sourcing notes
T5577 and EM4305 are both 125kHz read/write LF transponders, and most reader/writers list support for both — but they are not register- or command-identical: memory maps, config/control words, and password modes differ, so a reader must select the correct chip profile and a tag programmed for one is not automatically a substitute for the other. A functional, profile-specific alternative.
A functional alternative requiring design-in: pinout and driver may differ — re-validate with the corresponding development resources before production.
Frequently asked questions
Can EM4305 replace the T5577 / T5557 (125kHz read/write)? ▾
T5577 and EM4305 are both 125kHz read/write LF transponders, and most reader/writers list support for both — but they are not register- or command-identical: memory maps, config/control words, and password modes differ, so a reader must select the correct chip profile and a tag programmed for one is not automatically a substitute for the other. A functional, profile-specific alternative.
What should I check when replacing the T5577 / T5557 (125kHz read/write)? ▾
A functional alternative requiring design-in: pinout and driver may differ — re-validate with the corresponding development resources before production.
Is the EM4305 in stock, and can I get a quote? ▾
JLink Technology is an authorized distributor and supplies EM4305 with stock, pricing, and lead time. Click "Request a Quote" with your quantity and we reply within one business day.