| | Value | | --- | --- | | Type | N-channel MOSFET | | Drain-Source Voltage (VDS) | 100V | | Gate-Source Voltage (VGS) | ±20V | | Drain Current (ID) | 80A | | On-Resistance (RDS(on)) | 44mΩ | | Switching Time (ton/toff) | 10/15ns | | Thermal Resistance (Rth(j-c)) | 2.5°C/W |
The 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
The on the aluminum ECU casing (e.g.,0 261...) What fault codes or behaviors the vehicle is exhibiting
The is a specialized integrated circuit (IC) that has long served as a backbone component in automotive electronics, specifically for Engine Control Units (ECUs). Even in 2021, when looking for reliable automotive components, the B58944 remained a critical part in repair and replacement markets for ECU Bosch systems, particularly in Honda, Fiat, and Iveco vehicles. nec b58944 datasheet 2021
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 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 |
: Align the new chip, matching the Pin 1 orientation dot exactly with the board markings, and solder using either drag soldering techniques or a fine-tip iron. Summary Table: Quick Reference Specification Details Manufacturer NEC (Automotive Division / Legacy Architecture) Primary Part Variant B58944 / D43256BGU-70Y Commonly Found In Bosch EDC16 Engine Computer Boards Package Style Primary Failure Cause Thermal stress, voltage spikes, overcurrent Programming Requirement None (Operates as dynamic system memory structure) | | Value | | --- | ---
In the dimly lit archives of a global electronics distributor, Alex discovered a component that shouldn’t have existed in the 2021 digital catalog: the .
If you need to find where to buy this chip in 2026, I can search for current supplier inventory, or if you need help with the pinout for testing, I can try to find that specific diagram. NEC B58944 ECU DRIVER SOP-28 - Inovauto.com
| 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. | Even in 2021, when looking for reliable automotive
, and various European models using systems like Bosch ME7.4.4, ME7.5, and EDC16. Common Failure Point
When buying replacement parts from components distributors like Jotrin Electronics or specialty automotive suppliers like ECUFIXTTOOL , verify the precise suffix. Note that these replacement chips are shipped as "blank" hardware components. They do not store permanent firmware independently; rather, they rely on the ECU's master EEPROM and flash memory to dictate operations upon power-up. 2. Rework and Soldering Protocol
From service records and component-level repair logs (2020–2021), the NEC B58944 has been found in:
Though dependent on specific implementations, ICs in this class (such as those described in) are designed with protection mechanisms, including over-temperature protection, short-circuit detection, and reverse-polarity protection. Troubleshooting and Replacing the B58944
Do not assume B58944 is the actual datasheet part number. Post a clear photo of the component marking. Step 2: Search Renesas application notes for “B58944”. Step 3: Contact Renesas support with the full marking and device photo.