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EM4450/EM4550 is one of the most common low frequency chip, which has many applications such as Ticketing, Automotive Immobilizer with rolling code, High Security Hands Free Access Control, Industrial automation with portable database, Manufacturing automation, Prepayment Devices, etc….

General Description:

The EM4450/4550 is a CMOS integrated circuit intended for use in electronic Read/Write RF Transponders. The difference between EM4450 and EM4550 is that EM4550 are bumped and has mega pads for the two coils. 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.

Technical Features:

  • 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)
  • Bit Period = 64 or 32 periods of field frequency
  • 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

Ordering Information

Delivery Terms

  • <10K pcs: Within 3-4 working days
  • <100K pcs: Within 6-7 working days
  • <1KK pcs: Within 15 working days.
  • >1KK pcs: On request

Payment Terms

  • TT in advance or LC
  • Others on requested

Why buy from us ?

  • You can get our reply within 12 hours at most time
  • Unsurpassable competitive price
  • Large quantity inventory always
  • Strong at customization on request
  • Experience and expertise
  • Fast delivery and strong package



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Shanghai RealSmart Technologies Co., Ltd.

R201, Bldg E, No. 50, Lane 2080 Lianhua Rd, Minhang Dist, Shanghai 201103, China

Tel: +86 21 6432 6941

Fax: +86 21 6432 6942


Tel: +86 21 6432 6941