Nec B58944 Datasheet 2021 [better] Jun 2026
If you confirm the exact or share an image of the marking, I can help locate the correct 2021 or later datasheet.
Because it is a highly vulnerable, frequently replaced component during automotive diagnostics and repair, finding definitive engineering parameters via the revision is a high priority for hardware engineers, ECU remappers, and automotive technicians. Core Component Architecture and Specifications
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: Automotive engine drive chip / memory IC for ECU computer boards. Part Association : Frequently listed alongside , which is a standard 32K x 8-bit Static RAM (SRAM) Package Type : Typically found in a SOP (Small Outline Package) , common for surface-mount automotive applications. nec b58944 datasheet 2021
Are you currently troubleshooting a specific vehicle model or fault code? If you let me know the or the exact symptoms you are seeing, I can help you trace the circuit paths or find compatible replacement components. Share public link
Indicated by the "-70" suffix, signifying a 70ns access speed.
The NEC B58944 proved that in the fast-paced world of tech, sometimes the most important innovation isn't the newest chip, but the documentation that keeps the old ones running. If you confirm the exact or share an
Hardware suppliers such as Inovauto list the B58944 specifically as an ECU driver for Bosch and NEC systems. NEC B58944 ECU DRIVER SOP-28 - Inovauto.com
A massive benefit for bench techs is that the NEC B58944 is a blank/empty memory chip . It does not hold permanent firmware or proprietary vehicle data. You do not need to read, clone, or flash it before installation—simply solder a new one in place, and the main MCU will instantly write to it during boot.
: High-speed CMOS Static RAM / Bosch Engine Management Interface. Part Association : Frequently listed alongside , which
The B58944 is a critical component for repairing damaged automotive ECU boards, specifically for engine drive functions. It is compatible with a wide range of Bosch and Honda control units, including: ME7.4.4, ME7.5, ME7.5.10, ME7.9.6, ME7.9.20.
Based on available technical documentation from Bosch/NEC, the B58944 contains multiple DMOS (Double-diffused MOS) low-side switches, offering high efficiency and reliable protection. 2.1 Key Technical Features
: Used in Honda and various European models (e.g., ME7.4.4, ME7.5, ME7.9.6). Bosch EDC Series : Essential for diesel controllers like the EDC7 and used in Iveco and other commercial vehicles. Reliability & Repair
According to vehicle cross-reference databases on Inovauto , the B58944 acts as an essential driver component in several widely distributed ECU modules:
When buying replacement parts from components distributors like Jotrin Electronics or specialty automotive suppliers like ECUFIXTTOOL , verify the precise suffix. Note that these replacement chips are shipped as "blank" hardware components. They do not store permanent firmware independently; rather, they rely on the ECU's master EEPROM and flash memory to dictate operations upon power-up. 2. Rework and Soldering Protocol
