B58944 Datasheet | Nec

Including ME7.4.4, ME7.5, and ME7.9.6 (common in Honda and Volkswagen/Audi groups).

Practical summary for repair/modification

The B58944 is housed in a , a surface-mount design featuring 28 pins intended for efficient PCB integration. Technically, it is closely related to the D43256BGU series, which is a 256K-bit (32K x 8) CMOS static RAM. Its primary role in an ECU environment is to handle data storage or engine-driving functions that are essential for real-time vehicle management. Package Type: SOP-28 Manufacturer: NEC (often branded or used in Bosch modules) nec b58944 datasheet

These characteristics enable stable, high-speed data buffering in the harsh automotive environment and across the industrial temperature range.

The story of the NEC B58944 is a classic case of a "ghost" component—a part that is vital to keeping millions of vehicles on the road but officially exists only in the shadow of proprietary documentation. The Role: The Unsung Hero of the EDC16 The NEC B58944 (often labeled with D43256BGU-70Y Including ME7

: Lead-free / RoHS Compliant variants are standard for replacement stock.

If you have real-world experience repairing, programming, or replacing an NEC B58944 chip, please share your findings in the comments to help fellow technicians and enthusiasts. Its primary role in an ECU environment is

: Automotive Module Controller / Engine Drive IC. Pin Configuration and Package Footprint (SOP-28)

: The B58944 is often sold as an "empty" chip, meaning it does not contain pre-installed program data and must be integrated into the specific board's system architecture.