Nec B58944 Datasheet Jun 2026
The engine cranks but will not fire due to a lack of communication from the ECU.
The NEC B58944 is a high-performance amplifier IC that has been widely used in various electronic applications, including audio equipment, instrumentation, and communication systems. In this article, we will provide an in-depth review of the NEC B58944 datasheet, covering its features, specifications, and application areas.
The NEC B58944 datasheet is more than just a list of numbers; it’s a blueprint for the stability of the device it powers. Whether you are performing a "board-level" repair or archiving data for legacy support, understanding the PNP characteristics of this transistor is key.
The "NEC B58944" is a for a NEC Electronics µPD43256BGU-70L 256K-bit CMOS static RAM , packaged in a 28-pin SOP. It is used in critical ECUs primarily from Bosch in various vehicle models. It is a programmable IC requiring specific BDM or OBD tools and procedures , and its failure is linked to common ECU issues like loss of OBD communication. Key equivalent parts include the D43256BGU-70Y , and potential compatibility with low-power -70LL variants should be verified with datasheets. For ECU repair professionals and electronics engineers, this part remains a standard item for restoring functionality to many modern vehicles. When sourcing replacements, relying on reputable suppliers and using component marking references alongside manufacturer part numbers will help ensure successful repairs.
: Active LOW. Gates data from the I/O pins into the selected memory cell. 26 nec b58944 datasheet
The remains an elusive document, but by understanding NEC’s component families, typical packages, and application contexts, engineers can derive 80% of its functionality. Whether you are repairing a vintage monitor, restoring an old NEC computer, or simply cataloging surplus components, treat the B58944 as a custom hybrid IC – likely a voltage regulator or pre-driver – and proceed with careful testing. For mission-critical projects, always redesign with a modern, fully documented substitute.
Key electrical / packaging facts (compiled from distributor listings and datasheet aggregators)
Despite its industrial ruggedization, the B58944 is classified by technicians as a on automotive circuit boards. Because it handles volatile temporary data constantly, it is highly susceptible to external electrical stresses. Primary Causes of Component Failure
If you are currently troubleshooting an automotive board, what specific or symptoms is the engine module displaying? I can provide guided diagnostic steps to isolate the issue to this specific memory chip. Share public link The engine cranks but will not fire due
The NEC B58944 is a versatile IC that can be used in a variety of applications, including:
: Write Enable and Output Enable signals that regulate data flow timing to prevent collision on the ECU's internal bus. Primary Applications: Bosch EDC16 Repair
The B58944 operates via the .
Check the chip's clock inputs or output lines. Flatline signals during active CPU polling point to an internal component failure. Replacement and Repair Instructions The NEC B58944 datasheet is more than just
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NEC Corporation (now part of Renesas Electronics). Package Type: SOP-28 (Small Outline Package with 28 pins). Compliance: Lead-free and RoHS compliant.
Given this ambiguity, we will approach the datasheet from a functional perspective, referencing equivalent NEC components with known specifications.