The is a specialized integrated circuit (IC) widely recognized within the automotive electronics industry as a core memory component for engine control units (ECUs) . Manufactured by NEC (now part of Renesas), this chip is most commonly found in high-performance Bosch ECUs used by major vehicle manufacturers like Honda, Volvo, and Iveco. Core Technical Profile
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.
Based on NEC’s µPC series regulators and hybrid ICs, a possible pinout for B58944 in a 5-pin SIP (similar to µPC1093 or µPC494) could be:
: Specializes in automotive ECU drivers and replacement components. nec b58944 datasheet
When the NEC B58944 fails, the vehicle's ECU will typically trigger specific symptoms:
When sourcing a replacement, note that is listed as the brand in many databases. However, based on the available evidence, the most likely original manufacturer is NEC, now part of Renesas . Always verify the physical chip markings and the SOP-28 package to ensure you get the correct part.
: Tuning emission parameters dynamically. The is a specialized integrated circuit (IC) widely
: Random loss of vehicle map configurations or immoblizer data syncing. Bench Testing Protocol
: The vehicle cuts out when the engine bay reaches full operating temperature, pointing to internal IC thermal fracturing.
As it's a standard 32K x 8 SRAM, its pinout would follow a conventional SRAM configuration: The identical string "B58944" is also used to
If you are looking for a from another brand (like Infineon or ST) Share public link
If the B58944 is unavailable, technicians typically look for: NEC $\mu$PD43256BGU-70L (Direct equivalent).
According to industry databases and technical listings, the B58944 is equivalent to the . Type : CMOS Static RAM (SRAM). Capacity : 256 Kilobits (32K x 8 bits). Package : SOP-28 (Small Outline Package with 28 pins).