The MCP2021-500E/MD is a LINbus transceiver from Microchip Technology, configured as a half-duplex interface with one driver and one receiver (1/1). It operates from a 6V to 18V supply rail, making it suitable for automotive and industrial 12V battery systems where the bus voltage can sag or rise during cranking and load-dump events. The receiver hysteresis is specified at 175 mV, providing noise immunity on the LIN bus against signal degradation from coupled interference in a harness.
The part is supplied in tube packaging, consistent with prototype and low-to-medium volume assembly. For reel quantities, confirm the alternate order code with Microchip.
Second-source and cross-reference considerations
The closest functional peer is the MCP2022-500E/P, which shares the same LINbus protocol, half-duplex topology, 1/1 driver/receiver count, and 175 mV hysteresis, but is packaged in a through-hole PDIP rather than the surface-mount DFN. A board designed for the MCP2021-500E/MD (8-DFN) cannot accept the MCP2022-500E/P without a PCB respin due to the different footprint and mounting type (surface-mount vs through-hole).