Microchip Technology HCS500/SM

The HCS500 decodes compatible KEELOQ code-hopping transmissions for remote keyless-entry and access-control receivers. It can be used in a stand-alone decoder arrangement or with a host microcontroller. The device performs automatic bit-rate detection and supports normal and secure transmitter learning.

• KEELOQ code-hopping decryption and validation.
• Normal and secure learning mechanisms.
• Encrypted storage of manufacturer code and crypt keys in external EEPROM.
• Serial host interface through S_DAT and S_CLK.
• Internal oscillator and 3.0 to 5.5 V operating supply.

The catalog lists an 8-SOIC package with approximately 5.30 mm body width. Microchip DS40000153E calls the SM option an 8-lead SOIJ, a wide-body J-style outline. These descriptions require mechanical cross-check against the exact manufacturer package drawing; do not substitute a narrow-body SOIC footprint.

Layout checks

• Confirm 5.3 mm body class and lead style against Microchip's drawing.
• Use the eight-pin top-view diagram for pin orientation.
• Place supply bypassing and EEPROM connections close to the decoder.

The illustration is generic and is not a mechanical drawing for the SM suffix.

Check all encoder-format restrictions and security programming details in DS40000153E.

The P package variant is through-hole and not footprint-compatible. Any alternate decoder must match the SM mechanical outline, supply, EEPROM organization, host interface, learning mode, encoder timing, and key-provisioning method. No unverified internal product link is provided.

Microchip DS40000153E documents the HCS500 decoder, eight-pin pinout, operating behavior, and SM SOIJ package code. A legacy datasheet describes SM as a wide-body SOIC. The exact temperature ordering suffix for the catalog code should be confirmed before publication.

Verify the exact HCS500/SM marking, wide-body package, lot traceability, and temperature grade with the manufacturer or controlled ordering documentation. Protect manufacturer codes and crypt keys during programming.

Resolve the exact order-code temperature grade and SM mechanical nomenclature with Microchip. Validate the external EEPROM, receiver waveform, synchronization, learning process, host interface, and key handling against DS40000153E before design release.