EM4450- LF Animal & Access ICs

1 kbit Read/Write, Low Frequency Contactless Identification Device

General Description

The EM4450 is a CMOS integrated circuit intented for use in electronic Read/Write RF Transponders. The chip contains 1 KBit of EEPROM which can be configured by the user, allowing a write inhibited area, a read protected area, and a read area output continuously at power on.

The memory can be secured by using the 32 bit password for all write and read protected operations. The password can be updated, but never read. The fixed code serial number and device identification are laser programmed making every chip unique.

The EM4450 will transmit data to the transceiver by modulating the amplitude of the electromagnetic field, and receive data and commands in a similar way. Simple commands will enable to write EEPROM, to update the password, to read a specific memory area, and to reset the logic. The coil of the tuned circuit is the only external component required, all remaining functions are integrated in the chip.


  • Ticketing
  • Automotive Immobilizer with rolling code
  • High Security Hands Free Access Control
  • Industrial automation with portable database
  • Manufacturing automation
  • Prepayment Devices



  • 1 KBit of EEPROM organized in 32 words of 32 bits
  • 32 bit Device Serial Number (Read Only Laser ROM)
  • 32 bit Device Identification (Read Only Laser ROM)
  • Power-On-Reset sequence
  • Power Check for EEPROM write operation
  • User defined Read Memory Area at Power On
  • User defined Write Inhibited Memory Area
  • User defined Read Protected Memory Area
  • Data Transmission performed by Amplitude Modulation
  • Two Data Rate Options 2 KBd (Opt64) or 4 KBd (Opt32).
  • 170 pF ± 2% on chip Resonant Capacitor
  • -40 to +85°C Temperature range
  • 100 to 150 kHz Field Frequency range
  • On chip Rectifier and Voltage Limiter
  • No external supply buffer capacitance needed due to low power consumption
  • Available in chip form for mass production
EM4450 Data Sheet (392.95 KB)392.95 KB
EM4450 Application Note (176.96 KB)176.96 KB

EM4095 RFID Demo Reader
This 125kHz RFID reader supports the majority of EM Microelectronic's low freqency transponder ICs. The development reader serves as a reference design for reader manufacturers and comes with:

- Hardware schematics
- PCB Layout Gerber Files
- Microcontroller source code (easily portable C Language)
- PC software (allowing the user to operate with a large selection of RFID tags)
   export OrCAD

Part numberStockMOQPrice
EM4450A6WS7Available on demand--Order now

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