It is a BJT (bipolar junction transistor), NPN type, based on all available measurements.
: New replacement chips are typically "empty" and do not contain pre-loaded programs or data; they serve as hardware storage for the ECU's operating firmware. Identification and Equivalents This part is often cross-referenced with: μPD43256BGU-70L / 70Y : The standard NEC catalog equivalent. nec b58944 datasheet 2021
: Originally crafted by NEC, a titan of the semiconductor world before the industry consolidated. It is a BJT (bipolar junction transistor), NPN
: The B58944 is noted as a "easily damaged part" on ECU circuit boards. It is frequently sought by technicians to repair damaged engine computers rather than replacing the entire unit. Availability : Originally crafted by NEC, a titan of
For more detailed and precise specifications, including the 2021 datasheet, I recommend checking the following resources:
: 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