HCS412-I/SN

Specialized ICS Overview

The HCS412-I/SN is a KEELOQ code hopping encoder and transponder by Microchip Technology, housed in an 8-SOIC package. It operates on a 2.0V to 6.3V supply with an industrial temperature range of -40°C to +85°C. The device integrates a programmable 64-bit crypt key, two 64-bit IFF keys, and a 69-bit transmission format comprising a 32-bit encrypted portion and a 37-bit non-encrypted portion. Key features include asynchronous transponder communication, battery-low detection, and support for PWM or Manchester encoding.

Specialized ICS Feature Summary

• KEELOQ security with programmable 64-bit crypt key and read protection
• Bi-directional challenge-and-response authentication using two IFF algorithms
• Battery-less passive proximity activation via LC input amplifier
• On-chip EEPROM for user data and synchronization counter management

Specialized ICS Applications

• Automotive remote entry systems
• Gate and garage openers
• Electronic door locks (Home/Office/Hotel)
• Proximity access control

Specialized ICS Procurement Notes

Verify the 'I' suffix confirms the industrial temperature grade (-40°C to +85°C) and the '/SN' suffix denotes the 8-SOIC surface-mount package. Confirm the specific revision level against the latest Microchip datasheet DS41099D to ensure compatibility with existing decoder firmware and programming tools.

Specialized ICS Selection Notes

Select this component for designs requiring combined encoder and transponder functionality in a single chip. Ensure the application supports the required 69-bit transmission length and utilizes the KEELOQ algorithm. Verify that the system architecture can accommodate the asynchronous LF communication interface for transponder operations if proximity features are utilized.

Specialized ICS Part Context

This part belongs to the KEELOQ family of high-security crypto encoders. It serves as a unified solution for logical and physical access control, replacing separate encoder and transponder components. The device simplifies hybrid transmitter/transponder designs by integrating encryption, modulation, and low-frequency antenna interfaces.

Specialized ICS Replacement Considerations

Public confirmed substitute part numbers: None identified.