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RDS(on)cap R sub cap D cap S open paren o n close paren end-sub ): Extremely low (typically < 10mΩ) Gate-Source Threshold Voltage (
NEC’s semiconductor division merged with Renesas in 2010. Submit a part number inquiry through Renesas’s customer support portal. Provide photos of the component and any surrounding PCB markings.
If you are performing a repair on an ECU, keep these factors in mind:
Stalling, non-starting, or intermittent sensor errors can sometimes be traced back to a damaged B58944 chip. ECU Board Repair:
The most common symptom of a failed B58944 is the for diagnostics. Other potential issues include: nec b58944 datasheet
The is a specialized integrated circuit (IC) primarily utilized in automotive Engine Control Units (ECUs), particularly those manufactured by Bosch . In technical contexts, it is often identified by the full part number NEC B58944 D43256BGU-70Y . Technical Overview
The B58944 is a "vulnerable" component, meaning it is frequently the culprit when an ECU fails. It is found in several Bosch ECU families:
Because it is a specialized, manufacturer-ordered component rather than a generic consumer IC, finding standard commercial datasheets can be difficult. This comprehensive technical guide synthesizes everything an automotive engineer or technician needs to know about the NEC B58944, including its functional role, package characteristics, common faults, and replacement procedures. Component Overview and Functional Role
Connected to the load; the metal tab is also internally connected to the drain for cooling. RDS(on)cap R sub cap D cap S open
Examine the SOP-28 package pins using a microscope to look for solder fatigue or thermal discoloration.
Ensure you are using the SOP-28 variant, as 256K SRAMs also exist in DIP (Dual Inline Package) formats which will not fit the PCB footprints of modern ECUs.
While proprietary datasheets remain tightly controlled, the 28-pin SOP package layout aligns with standard industrial memory and driver pinouts used by Bosch configurations:
: Deployed primarily in commercial vehicles and heavy-duty diesel engines. Diagnosing B58944 Failures If you are performing a repair on an
For cross-reference lookups, standard datasheets and architectural configurations are cataloged on AllDatasheet .
Integrated circuits > Memories > SRAM > Parallel. eq. μPD43256BGU-70L. NEC Electronics. SO-28. Size = 256 Kib. B58944 NEC Integrated Circuits (ICs) - Jotrin Electronics
The module communicates using standard HCI packets:
: Work on an ESD-safe workbench. Apply a high-quality tacky flux to all 28 pins of the damaged chip.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. B58944 NEC Integrated Circuits (ICs) - Jotrin Electronics
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