Microchip Technology HCS201-I/SN

The HCS201 is a KEELOQ code-hopping encoder for a transmitter used with a compatible receiver. A switch activation produces a 66-bit transmission consisting of a 32-bit hopping portion and 34 fixed bits: a 28-bit serial number, four button bits and two status bits. It provides encoded data to an external radio stage; it is not an RF transmitter.

The registered package is 8-SOIC (0.154", 3.90mm Width). The local illustration is a package-family reference, not Microchip's controlled mechanical drawing.

Layout checks

• Confirm pin 1 orientation and body dimensions against the latest drawing.
• Place the external step-up components according to the validated circuit.
• Confirm tube handling and device marking with the supplier.

The package register marks this JPG as present and the local JPEG decodes successfully.

Microchip's top-view PDIP/SOIC HCS201 pin diagram assigns:

Unlike HCS200, HCS201 has functional pins at 4 and 7; do not use an HCS200 board footprint without a schematic review.

Consult the full manufacturer timing and electrical tables for component selection and validation.

The catalog-listed HCS201T-I/SN is the tape-and-reel ordering variant of the same HCS201 industrial SOIC device. Verify assembly feed, ordering quantity, marking and programming service before changing the purchasing code.

The catalog also lists HCS200-I/SN, but it is not a pin-compatible drop-in: HCS201 uses VDDB and STEP on pins that are unconnected on HCS200. Confirm receiver format and provisioned keys as well as hardware before any redesign.

Microchip Technology identifies HCS201 as a code-hopping encoder with step-up capability. In its ordering system, I is the -40°C to +85°C option and SN denotes the 8-lead SOIC. The optional T prefix on the package/temperature suffix identifies tape-and-reel packing. Check current manufacturer notices before production release.

Verify the full order code, tube label, lot and date-code traceability. Protect programming keys and confirm the received devices' provisioning state. Validate output frames, battery behavior and receiver learning in the intended system.

Use Microchip's current HCS201 data sheet and programming specification for schematic, footprint, key provisioning and final system validation. Security depends on receiver implementation and key management as well as the encoder. Distributor stock and price are time-sensitive and separate from the technical description.