HCS300 Series 2 - 6.3 V SMT KEELOQ Code Hopping Encoder IC - SOIC-8

Mfr Part#: HCS300-I/SN
Mounting Method:  Surface Mount
Package Style:  SOIC-8
Packaging:  TUBE
Std Packaging Qty:  100




$1.02 USD (each)
600+ $1.02


Qty in Stock : 0
Factory Stock : 0
Factory Lead-Time: 14 Weeks
Min. Order Qty: 600
Multiple of: 100
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Product Highlight

  • No of Outputs: Single
  • Supply Voltage-Max: 6.3 V
  • Reset Timeout: 10 ms

The HCS300 is a code hopping encoder designed for secure Remote Keyless Entry (RKE) systems. The HCS300 utilizes Microchip’s patented KEELOQ® hopping technology, which incorporates high security, a small package outline and low cost to make this device a perfect solution for unidirectional remote keyless entry systems and access control systems.

The HCS300 combines a 32-bit hopping code generated by a non-linear encryption algorithm, with a 28-bit serial number and 6 status bits to create a 66-bit transmission stream. The length of the transmission eliminates the threat of code scanning and the code hopping mechanism makes each transmission unique, thus rendering code capture and re-send (code grabbing) schemes useless. The encryption key, serial number, and configuration data are stored in EEPROM, which is not accessible via any external connection. This makes the HCS300 a very secure unit. The HCS300 provides an easy-to-use serial interface for programming the necessary security keys, system parameters, and configuration data. The encryption keys and code combinations are programmable but read-protected. The HCS300 operates over a wide voltage range of 2.0V to 6.3V and has four button inputs in an 8-pin configuration. This allows the system designer the freedom to utilize up to 15 functions. Additional features include an LED Drive, Overflow bits, Time-out, and Battery low indicator. The HCS301 operates in a voltage range of 3.5 V to 13.0 V.



  • Programmable 28-bit serial number
  • Programmable 64-bit encryption key
  • Each transmission is unique
  • 66-bit transmission code length
  • 32-bit hopping code
  • 28-bit serial number, 4-bit button code, 2-bit status
  • Crypt keys are read protected


  • 3.5 V - 13 V operation
  • Four button inputs
  • No additional circuitry required
  • 15 functions available
  • Selectable baud rate
  • Automatic code word completion
  • Low battery signal transmitted to receiver
  • Non-volatile synchronization data


  • Easy-to-use programming interface
  • On-chip EEPROM
  • On-chip oscillator and timing components
  • Button inputs have internal pull-down resistors
  • Current limiting on LED output
  • Low external component cost

View the complete HCS3x family of Motion Control IC's

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