Microchip Technology HCS300-I/P

The HCS300 generates a changing KEELOQ transmission code when a switch input is activated. A 32-bit hopping-code portion is combined with a 28-bit serial number and six information bits to form a 66-bit code word. Its four switch inputs support button combinations, while the PWM output supplies the encoded data stream to a suitable transmitter circuit.

The catalog records 8-DIP (0.300 inch, 7.62 mm). Microchip's product-identification table defines /P as an 8-lead plastic DIP with a 300 mil body, matching this registration. Use the controlled Microchip PDIP outline for lead spacing, body dimensions, orientation, and PCB footprint.

Assembly checks

• Verify the pin-1 indicator and eight-pin orientation.
• Check the actual 300 mil PDIP dimensions against Microchip's drawing.
• Keep supply bypassing close to VDD and VSS.
• Route PWM to the external transmitter interface specified by the system design.

The registered 8-DIP JPG is absent locally and returns HTTP 404 on the production site. This draft must remain unpublished until the image is restored and checked.

Pin numbers below follow Microchip's HCS300 PDIP/SOIC pin diagram and pin-description table.

Use the manufacturer timing and programming requirements for production provisioning.

The voltage range and feature figures are manufacturer datasheet values; observe its full electrical and timing conditions when designing the circuit.

Microchip also describes an 8-lead SOIC order option, but a different package is not footprint-compatible. Any related KEELOQ encoder requires comparison of code format, receiver compatibility, provisioning, pinout, supply limits, temperature grade, and qualification. No unverified internal substitute link or drop-in claim is made.

Microchip Technology documents the HCS300 as a KEELOQ code-hopping encoder. Its DS21137G product-identification table defines I as industrial temperature and P as the 8-lead, 300 mil PDIP. Consult Microchip's current controlled datasheet, errata, and product-change information before final qualification.

Verify the full order code, eight-lead PDIP body, device marking, lot traceability, and programming state at incoming inspection. Protected key storage does not remove the need for secure provisioning, receiver management, and complete-system security testing. Do not infer authorized-channel provenance from this listing alone.

Keep encryption keys and provisioning procedures controlled. Validate receiver synchronization, replay resistance, RF compliance, and failure handling at system level. Use the current Microchip HCS300 datasheet as the design authority. Publication is blocked until the actual registered package JPG is accessible and correct.