Primary Function: It is an automotive engine drive chip or ECU driver IC . It is frequently used in diesel engine computer boards, such as the Bosch EDC16 series .
Package Type: Typically found in an SOP-28 (Small Outline Package with 28 pins) .
Hardware Nature: Most units sold for repair are "empty" chips, meaning they do not contain pre-programmed data or software and are intended to replace physically damaged components on the circuit board .
Durability: It is widely noted in technical communities as a "vulnerable" part, often being the first component to fail on an ECU board during power surges or electrical faults . Key Specifications (Estimated)
Manufacturer: Originally produced by NEC (now part of Renesas Electronics) .
Alternative Identification: Often cross-referenced with the part number D43256BGU-70Y in some technical documentation, though this sometimes refers to a 256K-bit CMOS Static RAM chip in a similar SOP-28 package .
Vehicle Compatibility: Found in various European and Asian vehicle ECUs, including Volvo (XC70, XC90) and Mercedes-Benz . Sourcing and Documentation
While a full official 2021 PDF datasheet can be difficult to find through standard consumer channels due to its proprietary automotive nature, technical specifications and replacement parts are available through specialized electronics distributors: NEC B58944 ECU DRIVER SOP-28 - Inovauto.com nec b58944 datasheet 2021
VOLVO XC70 2.4 D 185CV EDC16C31. LCD Display for Dashboard Porsche 911 996 (Left) Km/h. Inovauto.com B58944 Datasheet, PDF - ALLDATASHEET.COM
The NEC B58944 is an automotive engine drive chip (Integrated Circuit) frequently used in BOSCH engine ECU boards.
While it is commonly discussed in repair and technical forums, it is often treated as a specialized "empty chip" that requires external programming and data to function within an ECU system. Key Specifications & Technical Details
Package Type: Typically available in a SOP28 (Small Outline Package with 28 pins).
Primary Application: Engine control unit (ECU) repair, specifically as a drive chip for automotive computers.
Manufacturing Status: Parts are available through specialty electronic distributors such as Jotrin Electronics.
Repair Context: It is identified as a component prone to damage on ECU circuit boards, making it a common target for replacement during automotive computer repairs. Datasheet and Documentation Primary Function : It is an automotive engine
Finding a single "2021" specific datasheet is rare for this part, as it is an older, specialized automotive component. Technical parameters and inventory details can be requested directly from electronic component suppliers like Jotrin Electronics or ECU Fix Tool.
If you are performing a repair, ensure you are referencing the specific D43256BGU-70Y variant if your board uses the combined NEC/BOSCH chip architecture. If you'd like, let me know: The specific vehicle or ECU model you are working on. The fault symptoms (e.g., no start, specific error codes).
If you need a pinout diagram or similar technical reference. NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC
I couldn’t find a specific NEC B58944 datasheet from 2021 in my current knowledge base or search results.
A few possibilities to help you find the correct document:
Check the part number – B58944 may be:
Likely component type – NEC (now Renesas Electronics) used 5‑digit codes for: Check the part number – B58944 may be:
Search suggestions:
"B58944" Renesas or "B58944" NECIf you have the device:
If you confirm the exact full part number or share an image of the marking, I can help locate the correct 2021 or later datasheet.
I cannot directly retrieve or generate the full NEC B58944 datasheet from 2021, as it is a copyrighted document and I do not have live access to NEC/Renesas’s internal or archived part databases.
However, I can help you prepare a structured datasheet request / summary template and advise where you are most likely to find the official 2021 revision of that document.
Try these specific searches (use exact phrases):
2SB589NEC B589B589 (shows if any distributor ever sold it)Because the original B58944 is obsolete, here are proven substitutes from 2021 repair logs:
| Substitute Part | Notes | |----------------|-------| | TIP31C | NPN, 100V, 3A, TO-220 – identical pinout, slightly lower gain. | | 2SC2331 | Better gain, same voltage/current. | | MJE15030 | Higher performance, 120V, 8A – overkill but safe. | | NTE153 (or NTE153AP) | Direct replacement from NTE Electronics (pricey but reliable). | | BD243C | 100V, 6A – available from ST/Multicomp. |
Warning: Always verify gain (hFE) and switching speed for your circuit. For SMPS applications, use a substitute with similar fT (≥50 MHz).