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The industry-standard equivalent for the NEC B58944 is the μPD43256BGU-70Y (or μPD43256 series). Memory Architecture: 256 Kbit (32K x 8 bits) Parallel SRAM. Package Type: SOP-28 (Small Outline Package with 28 pins).
: 70 nanoseconds (indicated by the -70 nomenclature in equivalent parts). Technology : Low-power CMOS Parallel Static RAM (SRAM).
This IC is known to be a "damaged-prone" part during ECU repairs; always ensure proper ESD precautions and heat management when soldering. nec b58944 datasheet Free
Because this component is primarily used in Bosch ECUs, automotive repair forums and ECU tuning websites can be valuable resources. Forums like ECUforum.ru, MHH Auto, and Digital-Kaos often have members who have reverse-engineered these components and can provide pinouts and functional descriptions based on practical experience.
: Look for the open-market equivalent datasheet, the μPD43256BGU-70L .
While official NEC/Renesas legacy datasheets can be elusive, technical parameters and PDF links are hosted on Elparts and Jotrin Electronics . Related search suggestions provided
The SOP-28 package optimizes heat dissipation directly into the PCB copper ground planes. 🚗 Target Applications & Supported Vehicles
When purchasing this IC for ECU repair, ensure the chip is "new" and "empty," as these drivers typically require proper integration into the board's existing logic rather than individual programming . B58944 NEC Integrated Circuits (ICs) - Jotrin Electronics
SOP-28 (Small Outline Package with 28 pins) . Function: Parallel SRAM / ECU Driver . Memory Density: 256 Kib . RoHS Status: Often listed as Lead-free/RoHS Compliant . Common Applications Package Type: SOP-28 (Small Outline Package with 28 pins)
Reliable platforms for locating these technical documents include:
Automotive grades often require -40°C to +85°C or higher. Pin Configuration: Match the Chip Enable ( CEcap C cap E ), Output Enable ( OEcap O cap E ), and Write Enable ( WEcap W cap E ) pins to ensure compatibility during replacement.
When the B58944 driver IC fails, the most commonly reported symptoms include:
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Frequently used as an ECU driver or memory chip in Bosch ME7.x and EDC16 series controllers for vehicles like Honda and Iveco. Datasheet and Resources