Produced by NEC (now part of Renesas Electronics).
Always ensure you are looking at electronic components. Use the full part number ( µPD43256BGU-70L ) when searching for the datasheet.
Use the exact part number in your searches to filter out noise and find the correct memory chip for your repairs, whether in an automotive ECU or another embedded system. nec b58944 datasheet Free
The NEC B58944 is a simple yet powerful 32K x 8-bit SRAM. It is used in embedded systems for temporary data storage and processing, especially in automotive ECUs, where it manages critical engine parameters.
It plays an essential role in several generations of and control modules, including: Produced by NEC (now part of Renesas Electronics)
I can provide the exact wiring locations, pinouts, and common failure points for your specific module. Share public link
Users on ECU tuning forums have specifically identified the B58944 inside Nissan X-Trail diesel ECUs (model EDC 16CP33-6.7), noting that it is located next to an MZP665 BGA processor. This chip is integral to the ECU's operation and is a common point of failure in these modules. Use the exact part number in your searches
For technicians and engineers, the most practical approach is often to focus on the component's functional characteristics and cross-reference numbers. The D43256BGU-70Y and Infineon equivalents provide viable alternatives, and the wealth of information available through automotive repair communities can often substitute for formal manufacturer documentation.
Note: Sourcing a physical replacement chip from hardware suppliers yields an "empty chip," meaning it contains no pre-flashed software data. The chip acts as a hardware canvas that interacts directly with your vehicle's core flash memory chip. Common Failure Symptoms & Troubleshooting
The is a specialized integrated circuit (IC) widely recognized within the automotive electronics industry. If you are searching for the NEC B58944 datasheet , it is essential to understand that this part is an OEM-specific (Original Equipment Manufacturer) component, often appearing in Bosch automotive Engine Control Units (ECUs) .
: As noted by ECUFIX, new B58944 chips are "empty" and will not work unless programmed with the correct data for your specific Bosch ECU model.