Nec B58944 Datasheet «TRUSTED»

The chip is fabricated using NEC's advanced silicon-gate CMOS technology, contributing to its high speed and low power draw.

The NEC B58944 is more than just a part number; it is a vital link in the chain of automotive reliability. As a 256K SRAM chip housed in a compact SOP-28 package, it provides the low-latency memory environment necessary for modern engines to run efficiently. For engineers and technicians, identifying its relationship to the series is the key to sourcing the correct datasheet and ensuring successful hardware diagnostics. NEC B58944 ECU DRIVER SOP-28 - Inovauto.com NEC B58944 ECU DRIVER SOP-28. Inovauto.com NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC

: If an external solenoid or valve shorts out, the internal flyback protection diode within the B58944 can fail open, causing subsequent high-voltage spikes to destroy the logic driver channel.

: Apply high-quality tacky flux to both rows of the SOP-28 pins. Use a hot air rework station set to 350°C–380°C with a medium airflow setting to melt the factory lead-free solder, then gently lift the IC with tweezers. nec b58944 datasheet

Frequently paired with an NPN counterpart for push-pull configurations.

. It is often used for repair and replacement in diesel engine controllers like the Technical Identification

) . NEC components are often sorted into "ranks" (indicated by a letter suffix) based on their gain. If you are replacing a B58944, matching the gain rank is vital for circuit balance. 3. Performance Curves The chip is fabricated using NEC's advanced silicon-gate

Typically rated at 70ns (indicated by the "-70" suffix). Manufacturer: NEC Electronics (now Renesas). Automotive Applications

Since no official NEC B58944 datasheet is publicly archived, the following parameters are derived from NEC’s standard hybrid regulator family (e.g., µPC7800 series and µPC2930 series). Use these values only as a reference for testing or substitution:

The is a specialized Integrated Circuit (IC) primarily used in automotive Engine Control Units (ECUs) , specifically for BOSCH engine computer systems. It is often identified alongside the part number D43256BGU-70Y , which designates it as a specific type of high-speed CMOS static RAM chip frequently adapted for automotive driver applications. Technical Summary : Apply high-quality tacky flux to both rows

: Parallel SRAM, allowing for direct and fast data retrieval by the host microcontroller. Applications and Repair

Have you encountered the NEC B58944 in a device? Contribute your findings to the comments section or contact the author for inclusion in future updates to this datasheet guide.

The real "story" for engineers and mechanics is the hunt for the datasheet. Because this chip was custom-manufactured by NEC for Bosch, a standard public datasheet doesn't technically exist in the way it does for a generic transistor. www.bosch-semiconductors.com The Repair Community: For years, ECU repair specialists on forums and sites like

The NEC B58944 is engineered to withstand the extreme environmental conditions of an engine bay, including high thermal cycles, voltage spikes, and mechanical vibration. Core Architecture and Specifications : NEC (Nippon Electric Company)