Nec B58944 Datasheet 2021 【Ultimate】

| Dimension | Min | Max | |-----------|-----|-----| | Body Length | 10.0 | 10.5 | | Body Width | 4.4 | 4.7 | | Body Height | 15.0 | 15.9 | | Lead Pitch | 2.54 (nominal) | - | | Mounting Hole Dia | 3.6 | 3.8 |

Viewed from the flat face with leads downward:

Package type: TO-220 (isolated or non-isolated variants exist).

The 2021 datasheet emphasizes the device's switching efficiency, a critical parameter for modern SMPS (Switched-Mode Power Supplies) and DC-DC converters.

  • Gate Threshold Voltage ($V_th$): Range typically between 2.0V and 4.0V. This allows the device to be driven by standard logic-level circuits, although higher gate voltages (10V-12V) are required to achieve the optimal $R_DS(on)$.

  • Switching Speeds:

    • NEC B58944 is an integrated circuit (IC) primarily used as an SRAM (Static Random-Access Memory)

    chip in automotive electronic control units (ECUs), particularly those manufactured by . It is technically equivalent to the μPD43256BGU-70L part from NEC Electronics. Technical Specifications

    Based on its equivalency to the μPD43256BGU series, the core specifications are as follows: Component Type : Parallel SRAM memory. Memory Density : 256 Kib (32K x 8 bits). Package Type (SOP-28) surface-mount package. Access Time : Approximately

    (indicated by the "-70" suffix in the equivalent part number). Applications and Use Cases Automotive ECU Repair : The B58944 is a common component in BOSCH automotive engine computers

    . It is often identified as a "driver chip" or memory chip that can be replaced to repair damaged ECU circuit boards. Programming

    : 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.

    : Shortened industry designation for the same 256k SRAM family.

    You can find more detailed inventory and technical data on platforms like Jotrin Electronics or specific cross-reference parts for an ECU repair project?

    Part: B58944 • SO-28 • datasheet, pdf, info ... - Elparts

    I couldn’t find a specific NEC B58944 datasheet from 2021 in my current knowledge base or search results.

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    • 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.

    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:

    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.

    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

    Manufacturer: NEC Corporation (now part of Renesas Electronics). Package Type: SOP-28 (Small Outline Package with 28 pins).

    Associated Component: Frequently cross-referenced with the μPD43256BGU-70L, which is a 256 Kib Parallel SRAM.

    Role in ECU: It serves as a driver IC, often acting as a vulnerable point in automotive circuit boards that may require replacement to restore ECU functionality. Technical Characteristics

    The B58944 is typically found in high-performance automotive environments. Based on its association with the D43256BGU series, key parameters include: Memory Configuration: 32,768 words 8 bits (if functioning as the SRAM component).

    Access Time: 70 ns (indicated by the "-70Y" or "-70L" suffix).

    Power Requirements: Standard low-power CMOS operation suitable for the stable but demanding power rails of a vehicle's computer system. Applications and Repair Context

    In the automotive repair industry, the NEC B58944 is known as a "vulnerable driver IC". It is a common point of failure on BOSCH Auto ECU circuit boards. Repair technicians often seek this specific chip to: nec b58944 datasheet 2021

    Restore Engine Drive: Fix chips responsible for engine drive signals that have burned out or suffered electrical stress.

    ECU Computer Repair: Swap out the "empty" IC (which contains no internal program or data) to allow the ECU's main processor to function correctly again. Design Considerations

    When integrating or replacing this component, designers and technicians must account for: AN218241 PSOC 6 MCU Hardware Design Considerations

    The NEC B58944 is a specialized automotive ECU (Engine Control Unit) driver chip

    , typically found in Bosch systems such as the EDC16 diesel engine computer. In some technical documentation and inventory listings, it is cross-referenced or identified as the D43256BGU-70Y , which is a 256K-bit CMOS Static RAM. Key Technical Specifications Manufacturer Package Type SOP-28 (Small Outline Package, 28-pin) Primary Function ECU Driver / Solid State High-Side Relay Memory Specs 32K words x 8 bits (if identified as D43256BGU) Access Time Voltage Supply 4.5V to 5.5V (Standard CMOS) Operating Temp 0°C to 70°C (Standard) Applications and Features Engine Control:

    Specifically used as a driver chip for Bosch ECUs in vehicles like Honda, Iveco (EDC16), and various ME7 series modules (e.g., ME7.5, ME7.9.6). Vehicle Repair:

    It is frequently replaced during ECU board repairs when the unit fails to communicate or drive engine components properly. High-Side Driving:

    Operates as a dual-channel high-side solid-state relay to control power flow to automotive actuators. Data Retention: When used in its RAM capacity, it features low cap V sub cap C cap C end-sub

    data retention (minimum 2.0V) and battery backup capabilities. www.dcddcc.com Pinout Overview (SOP-28)

    The SOP-28 configuration generally follows standard JEDEC SRAM or driver layouts for 28-pin packages: Address Inputs: cap A sub 0 cap A sub 14 Control Pins: Chip Enable ( modified cap C cap E with bar above ), Output Enable ( modified cap O cap E with bar above ), and Write Enable ( modified cap W cap E with bar above cap V sub cap C cap C end-sub (Pin 28) and cap G cap N cap D www.dcddcc.com

    For further procurement or detailed schematics, retailers like Jotrin Electronics

    provide updated stock and compatibility lists as of 2024–2026. Jotrin Electronics list of compatible replacement NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC

    The NEC B58944 is a specialized integrated circuit primarily utilized as an ECU driver within automotive engine control units. Often cross-referenced as the Bosch B58944, this component is a critical "intelligent" power switch used to manage various actuators in modern vehicle electronics. Key Specifications and Overview

    While full public datasheets for automotive-grade proprietary chips like the B58944 are often restricted to authorized manufacturers, the following technical profile has been established through industry procurement data:

    Manufacturer: NEC Corporation (now under the Renesas umbrella) and Bosch.

    Package Type: SOP-28 (Small Outline Package with 28 pins), a standard surface-mount format for high-density automotive circuits.

    Function: Integrated circuit (IC) driver designed for Engine Control Units (ECUs). Compliance: Generally listed as Lead-free / RoHS Compliant. Common Applications

    The B58944 is a staple in the repair and manufacturing of high-performance ECUs. It is frequently found in systems developed by Bosch for major automotive brands:

    Honda: Used in various ME-series control modules (e.g., ME7.9.6, ME7.5). | Dimension | Min | Max | |-----------|-----|-----|

    Iveco & Heavy Duty: Found in EDC7 and EDC16 diesel control systems.

    Volkswagen/Audi Group: Compatible with ME7.4.4 and ME7.5.10 systems.

    General Purpose: Applicable in communications equipment, industrial controls, and personal electronics requiring robust driver ICs. 2021 Technical Context and Availability

    As of 2021 and moving into 2026, the B58944 remains a "legacy yet essential" part. Because these chips are often custom-made for Tier 1 automotive suppliers like Bosch, they are typically sourced through specialized distributors rather than general consumer electronics retailers.

    Sourcing: Available via Worldway Electronics or Jotrin Electronics, which provide factory excess stock for repair workshops.

    Repair Insights: In many automotive repair scenarios, the B58944 is replaced alongside other memory or processor chips like the D43256BGU to restore full ECU functionality. Design and Integration Tips If you are integrating or replacing this part:

    Thermal Management: Given its role in SOP-28 packaging as a driver IC, ensure adequate heat dissipation through PCB copper pours, as ECU environments are subject to high thermal stress.

    Compatibility: Double-check the suffix on the part number, as variations may exist for different voltage tolerances or temperature grades.

    Authentication: Always source from authorized resources to avoid "gray market" components that may lack the durability required for automotive safety systems. NEC B58944 ECU DRIVER SOP-28 - Inovauto.com

    The NEC B58944 (often cross-referenced as the $\mu$PD43256BGU-70L or D43256BGU-70Y) is a specialized Static RAM (SRAM) integrated circuit primarily utilized as an ECU driver or memory chip within automotive engine control units.

    While it is frequently associated with Bosch-manufactured automotive hardware, it is an NEC-manufactured part designed for high-reliability environments. Core Technical Specifications

    Based on technical data available for its equivalent parts and automotive application listings: Type: Parallel Static RAM (SRAM). Memory Size: 256 Kib (32K x 8 bits). Package Type: SOP-28 (Small Outline Package with 28 pins).

    Access Speed: Typically 70ns (indicated by the "-70" suffix in equivalent part numbers like D43256BGU-70Y). Primary Manufacturer: NEC Electronics. Automotive Applications

    The B58944 is a critical component for repairing damaged automotive ECU boards, specifically for engine drive functions. It is compatible with a wide range of Bosch and Honda control units, including: Bosch Models: ME7.4.4, ME7.5, ME7.5.10, ME7.9.6, ME7.9.20.

    Diesel Systems: EDC7, EDC16 (found in Iveco and S10 Nova vehicles).

    Other Vehicle Matches: Volvo XC70 and XC90 (EDC15C11 and EDC16C31 systems). Usage and Availability

    Repair Status: It is considered an "easily damaged" part on Auto ECU circuit boards and is often sold as a replacement "empty chip" (no pre-loaded program or data) for technicians performing hardware-level repairs.

    Procurement: Parts can be sourced through specialized electronic component distributors like Jotrin Electronics or automotive repair supply sites like Inovauto. B58944 - datasheet, pdf, info, parameters, stock - Elparts

    Integrated circuits > Memories > SRAM > Parallel. eq. μPD43256BGU-70L. NEC Electronics. SO-28. Size = 256 Kib. B58944 NEC Integrated Circuits (ICs) - Jotrin Electronics Gate Threshold Voltage ($V_th$): Range typically between 2

    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.