Nec B58944 Datasheet Free [best] [2024-2026]

. In the context of vehicle repair, it is frequently replaced when an ECU suffers from memory-related failures or physical damage to the circuit board. 256 Kib (32,768 words × 8 bits). Access Time: 70 ns (indicated by the "-70" suffix). Package Type: 28-pin PLASTIC SOP (Small Outline Package) or SO-28. Operating Voltage: Typically 2.7V to 5.5V for the "B" version. Key Feature:

: Clean off all protective silicone conformal coatings from around the SOP-28 package.

This site specializes in obsolete components. If NEC stopped making the B58944 in 1995, this is your best bet.

For standard power packages like the TO-220 or TO-3P variant of this component, the pin configuration typically follows standard industry layouts:

The NEC B58944 is engineered for harsh, high-reliability automotive environments. It functions heavily as an interface or driver chip within Bosch electronic engine management modules. Specification Details NEC Electronics (now Renesas) / Bosch Package Type SOP-28 (Small Outline Package, 28-pin) Mounting Type SMD / SMT (Surface Mount Technology) Primary Application Automotive ECU Driver / Voltage Regulation & Monitoring Associated Modules Bosch ME7.x, EDC16, EDC7 Diesel and Petrol Systems RoHS Status Lead-Free / RoHS Compliant 🛠️ Key Technical Specifications & Architecture nec b58944 datasheet Free

[Isolate the ECU Fault] | v [Check Pin 28 (VCC)] ----(No Voltage)----> Check Board Voltage Regulator (e.g., Bosch Power IC) | (+5V Present) | v [Inspect Data / Address Pins via Logic Analyzer] | (No Activity) | v [Replace Defective NEC B58944 IC] Steps for Physical Component Replacement

: Heavy-duty and passenger diesel injection platforms found in Iveco commercial trucks, Fiat vehicles, and GM/Chevrolet applications. Pinout Configuration (SOP-28 Package)

Replacing "empty" chips that do not contain pre-stored programs or data, requiring external programming if used for specific firmware tasks. Datasheet and Sourcing

If you are working on a specific ECU repair involving the B58944, we recommend reaching out to the automotive electronics community or a professional ECU repair specialist, as they may have access to resources not available through standard public channels. Access Time: 70 ns (indicated by the "-70" suffix)

Tied to massive ground planes to sink heat away from the silicon die. Power Stages / Outputs

: It is typically an "empty" chip; when used for repairs, it does not contain software itself but provides the physical space for the ECU's processor to work. Where to Find Resources

The NEC B58944 is a type of N-channel MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) designed for high-speed switching applications. Manufactured by NEC Corporation, a renowned Japanese electronics company, this component is widely used in various electronic devices, including power supplies, motor control systems, and audio equipment.

| Parameter | Symbol | Rating | Unit | | :--- | :---: | :---: | :---: | | Supply Voltage | $V_CC$ | 7.0 | V | | Output Voltage (Peak) | $V_OUT$ | 120 - 180 | V | | Operating Temperature | $T_opr$ | -20 to +70 | °C | | Storage Temperature | $T_stg$ | -40 to +125 | °C | Key Feature: : Clean off all protective silicone

Do not confuse this with the 2SB589 transistor. The 2SB589 is a PNP power transistor. While the numbers look similar, the B58944 is distinct. Ensure your board actually says "B58944" and not "B589" or "D58944."

Technically, the B58944 is often cross-referenced or identified as being equivalent to the , which is a 256 Kib Parallel SRAM chip manufactured by NEC Electronics in an SOP-28 (SO-28) footprint. Technical Summary Manufacturer: NEC Electronics (now Renesas) . Equivalent Model: μPD43256BGU-70L. Package Type: SOP-28 / SO-28. Function: ECU Driver / Static RAM (SRAM).

✅ Real Identity: It's a 256K CMOS SRAM ($\mu$PD43256BGU).✅ Package: SOP-28.✅ Common in: Honda, Iveco, and VW/Audi Bosch units.

If the datasheet is impossible to find publicly, it may be locked inside a manufacturer's private database. However, forums like Badcaps (dedicated to capacitor and IC repair) have users who have extracted these datasheets from original equipment manufacturers (OEMs).

: Parts are currently listed as available through distributors like Jotrin Electronics .