Nec B58944 Datasheet 2021 _verified_ <VALIDATED ✭>
The NEC B58944 is a specialized integrated circuit (IC) primarily utilized as an ECU driver within automotive engine management systems. It is technically equivalent to the $\mu$PD43256BGU-70Y, a 256 Kib Parallel SRAM. Technical Overview and Specifications
The NEC B58944 functions as high-speed memory, enabling real-time data processing for engine driving chips in vehicles. Detailed technical parameters include: Component Type: 256 Kib Parallel Static RAM (SRAM). Package Type: SOP-28 (Small Outline Package with 28 pins).
Access Time: Indicated by the "-70" suffix, signifying a 70ns access speed.
Equivalent Part: Often cross-referenced as $\mu$PD43256BGU-70L or $\mu$PD43256BGU-70Y. Key Automotive Applications
This chip is a critical component in the repair and maintenance of Electronic Control Units (ECUs) for several major automotive brands. Common ECU models that utilize the B58944 include: nec b58944 datasheet 2021
Bosch ME Series: ME7.4.4, ME7.5, ME7.5.10, ME7.9.6, and ME7.9.20. Iveco EDC Series: EDC7 and EDC16.
Vehicle Manufacturers: Widely found in Honda, Volvo (e.g., XC70 and XC90), and Iveco engine management systems. Sourcing and Data Sheets
While the original NEC semiconductor line has transitioned under Renesas, the B58944 remains available through specialized electronic component distributors and ECU repair services.
Technical Data: You can view inventory and basic parameters on platforms like Jotrin Electronics or Elparts. The NEC B58944 is a specialized integrated circuit
Repair Services: Specialized workshops like ECUfix provide replacement chips and firmware files specifically for ECU restoration.
Supplier Options: 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
3.2 Marking
The top line reads B58944, often preceded by NEC logo. Second line may contain date code (e.g., H941 for August 1994 or similar). No surface-mount variant has been reliably documented.
Step 1: Decode the Marking
Look at the physical component. "B58944" is likely a combination of: Type number: B589 or 2SB589 Lot/Batch: 44 (date
- Type number:
B589or2SB589 - Lot/Batch:
44(date code or factory code)
Action: Search for 2SB589 or B589 transistor instead.
| If the component has... | It is likely... | | :--- | :--- | | 3 pins, plastic case | PNP transistor (2SB589) | | 5-7 pins, small IC | Custom driver or logic IC | | Large, metal tab | Power transistor or voltage regulator |
Q1: Is the NEC B58944 a MOSFET or BJT?
A: It is a BJT (bipolar junction transistor), NPN type, based on all available measurements.
Q4: Why does my B58944 have a different pinout?
A: Some OEM orders used specialized pin configurations (e.g., reverse pinout for automated assembly). Always test.