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Nec B58944 Datasheet 2021 !new!

The NEC B58944 is a 256-Kibit Parallel SRAM integrated circuit manufactured by NEC Electronics. It is commonly used as a memory component in various electronic systems. Key Features and Specifications

According to technical databases like Elparts and Jotrin Electronics, the B58944 has the following features: Device Type: Static Random Access Memory (SRAM). Memory Density: 256 Kibit (Kilobits). Interface: Parallel. Package Type: SO-28 (Small Outline 28-pin).

Equivalent Part: It is functionally equivalent to the $\mu$PD43256BGU-70L.

Access Speed: Typically indicated by the suffix (e.g., "-70L" denotes a 70ns access time). Datasheet Availability

While NEC Electronics has undergone various corporate restructuring (merging into Renesas Electronics), you can still find legacy technical documentation through these third-party distributors and archives:

Elparts Parameter View: Provides a simplified view of parameters and package info.

AllDatasheet Search: A repository for PDF versions of technical manuals for older semiconductor parts. B58944 - datasheet, pdf, info, parameters, stock - Elparts

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 . nec b58944 datasheet 2021

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 The NEC B58944 is a 256-Kibit Parallel SRAM

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 a specialized integrated circuit primarily utilized as an ECU driver within automotive engine control units. It is widely recognized as an equivalent or alternative designation for the $\mu$PD43256BGU-70L, a 256-Kibit static RAM (SRAM) component. Technical Overview Component Type: Integrated Circuit (IC) / SRAM.

Function: In automotive contexts, it serves as a driver or memory buffer for Engine Control Units (ECUs), often found in Bosch or other European automotive modules. Package Style: SOP-28 (Small Outline Package with 28 pins). Memory Density: 256 Kilobits (32K x 8 bits).

Performance: Typically rated with an access time of 70ns (indicated by the "-70" suffix in its equivalent part number). Application & Repair

The B58944 is frequently referenced in professional automotive repair circles, specifically for:

ECU Refurbishment: Replacing failed driver chips in older vehicle control modules.

Data Storage: Handling critical operational parameters and temporary data within the vehicle's computer system. The top line may be the real part (e

While the "2021" designation in your query may refer to updated inventory records or specific 2021 datasheet revisions from distributors like Jotrin Electronics or Elparts, the core technology remains an established standard in legacy automotive electronics. NEC B58944 ECU DRIVER SOP-28 - Inovauto.com

3. How you can identify the part without the datasheet

Look at the actual component marking — not just B58944. Example:

NEC
B58944
123
  • The top line may be the real part (e.g., µPD78F, 2SC, PS2561)
  • B58944 could be a date/lot code (year 2021, week 44?)

Check:

  • Package type (SOT-23, DIP, QFP, TO-220)
  • Pin count
  • Application (power supply, MCU, opto, RF)

1. Overview of the NEC B58944

5.3 Leakage Check

Between collector and emitter at 60V DC (using insulation tester or curve tracer): leakage should be < 10µA.

1.1 What is the NEC B58944?

The NEC B58944 is widely identified as a bipolar junction transistor (BJT) or, in some documented applications, a Darlington transistor array or switching transistor. Based on cross-referencing with vintage equipment service manuals (especially CRT monitors, power supplies, and audio amplification stages from the 1990s and early 2000s), the B58944 typically functions as a medium-power NPN transistor.

However, it is critical to note that NEC's part numbering convention in that era often used "B" prefixes for PNP transistors and "D" for NPN. The "58944" suggests a custom or semi-custom OEM (Original Equipment Manufacturer) part number. Therefore, the NEC B58944 datasheet 2021 search often leads to confusion, as no unified public datasheet exists under that exact string.

4. If you still need a “prepared piece” (summary table)

Here is a placeholder datasheet template you can fill in as you find the real document:

| Parameter | Value (when known) | |-----------|--------------------| | Manufacturer | NEC / Renesas | | Part number | B58944 (verify) | | Part family | ? | | Package | ? | | Pin count | ? | | Operating voltage | ? | | Supply current | ? | | Key features | ? | | Datasheet release | 2021 (if confirmed) | | Status | ? (Active / EOL) |