In this context, it is almost exclusively associated with , a leading global automotive supplier. Furthermore, based on the parts often listed alongside it, the NEC B58944 is most likely a memory component, specifically a static RAM (SRAM) chip , used by the ECU's main processor as temporary data storage. The designation "B58944" is a proprietary Bosch number, and the term "NEC" refers to the original manufacturer of the underlying silicon chip (NEC Electronics, now part of the Renesas Electronics corporation).
Before moving on, it's crucial to clarify a common point of confusion. The identical string "B58944" is also used to classify an manufactured by Borosil Scientific, designed for lab analysis of fine crystalline precipitates. While this is an interesting coincidence, it is completely unrelated to the IC we are discussing.
Ensure the Emitter-Base-Collector sequence matches your PCB. Gain ( hFEh sub cap F cap E end-sub ): Try to stay within 10% of the original NEC rating. nec b58944 datasheet
: Align the new chip's pins with the pads. Tack down one corner pin. Solder the rest using a fine-tip iron. Perform a visual inspection under magnification to ensure there are no solder bridges or bad joints.
If you are looking to purchase the B58944 for your next repair or project, you can find it at several reputable distributors: In this context, it is almost exclusively associated
Isopropyl alcohol (99% concentration) and an ESD-safe brush. Step-by-Step Rework Procedure
This IC is a "vulnerable" part, meaning it is one of the most common failure points in older or high-mileage vehicle computers. It is frequently found in a wide array of Bosch-manufactured ECUs for brands like , Iveco , and various European models. Specific ECU models that utilize the B58944 include: Bosch ME7.x series (e.g., ME7.4.4, ME7.5, ME7.9.6) Bosch EDC series (e.g., EDC7, EDC16) Repair and Procurement Before moving on, it's crucial to clarify a
As it's a standard 32K x 8 SRAM, its pinout would follow a conventional SRAM configuration: