Microchip Technology MCS3122T-I/ST

The MCS3122 combines three switch inputs, a programmable 32-bit serial number, a 128-bit crypt key and an AES-128 block cipher. It supports 160-bit or 192-bit transmission codes, with the longer form including an optional 32-bit authorization check. Configurable RF and data modulation support FSK or OOK and PWM or Manchester formats, respectively.

LCDChip's original registered package is 14-TSSOP (0.173", 4.40mm Width). Microchip's product-identification table gives ST = TSSOP and lists MCS3122-I/ST as the industrial TSSOP example and defines T as the tape-and-reel option. Use the current controlled package drawing for land pattern, body width and pin-one marking.

Layout checks

• Confirm the 14-pin TSSOP orientation and controlled footprint.
• Keep the RFOUT matching path appropriate for the chosen radio implementation.
• Route XTAL and programming-related lines according to Microchip guidance.

The expected 14-TSSOP JPG is missing locally and returns HTTP 404 in production. Restore and inspect it before publication.

Microchip's 14-pin TSSOP table identifies both power and RF-control connections. Use the manufacturer's top-view drawing for physical orientation.

Pin functions are from Microchip data sheet DS40001762A, Table 1; do not infer them from another encoder.

Configuration-dependent functions and typical-current examples must be checked against the programmed application; the listed supply and temperature ranges are normal operating conditions.

Compare complete order code, package, temperature grade, provisioning method, cryptographic format, receiver support, RF modulation, data format and pin functions. The MCS3122-I/ST uses standard packaging rather than this tape-and-reel order code; purchasing format alone does not establish a validated substitute for an already-programmed transmitter. No internal replacement link is added without manufacturer-backed equivalence and an exact API match.

Microchip Technology documents MCS3122 in its Advanced KEELOQ Technology Encoder data sheet DS40001762A. The feature overview, pin table, electrical specifications and product-identification example establish the claims used here for MCS3122T-I/ST.

Verify the exact suffix, 14-pin TSSOP dimensions, pin-one orientation, lot traceability and device programming state. Validate receiver enrollment and RF behavior with an authorized system-level test. Protect cryptographic keys and provisioning records.

Configure modulation, button mapping and maximum code word for the intended receiver, and follow Microchip's controlled programming specification. Validate RF matching, regulatory compliance and key custody. Restore the live 14-TSSOP JPG and complete formal review before publication.