LIN bus physical layer for the 12V board
The MCP2003A-E/SN is a LIN bus transceiver — the physical-layer interface between a microcontroller's UART and the single-wire LIN bus found in automotive body electronics, sensor clusters, and low-speed actuator networks. Half-duplex operation with a single driver and single receiver (1/1) means it handles bidirectional communication on the same wire, one direction at a time, which is the standard LIN topology. Supply range of 6 V to 27 V covers the nominal 12 V automotive rail with headroom for load-dump transients and cold-crank dips, so it stays alive when the battery sags during engine start.
Temperature grade and package fit
This is the under-hood and cabin-grade band; the part operates through the heat soak of a parked car in summer and the cold crank of a winter start. The 1.27 mm pitch is a standard footprint that routes easily on a two-layer board without micro-vias. Receiver hysteresis of 175 mV provides noise immunity on the bus — the input doesn't chatter when the LIN line carries coupled ignition noise or ripple from the alternator.
Active production and compliance
Lifecycle status is Active — Microchip continues to manufacture this part for new and existing designs. ROHS3 compliant, so it meets the current EU restriction on hazardous substances without an exemption. No additional compliance documentation (REACH, UL, IEC) is listed in the part record.
Sourcing posture
Available to order through independent distribution channels. The MCP2003A-E/SN is a current-production part, so it can be sourced through authorized Microchip distributors as well as the independent market. No risk of counterfeit from a discontinued line.