: 70 nanoseconds ( -70Y suffix indicates speed grading and temperature profiling).
Viewing angle: The emission half-angle (e.g., 120° typical) informs optical coupling and perceived brightness for indicators or backlights.
The SOP-28 package allows for automated PCB assembly and efficient heat dissipation on the ECU circuit board. 4. Over-Current and Thermal Protection
Temporarily stores raw signals from Mass Air Flow (MAF), Oxygen, and Crankshaft position sensors. nec b58944 datasheet 2021
| 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. |
Persistent corruption of temporary adaptation values, causing rough idling after ignition cycles.
The following table provides a summary of the technical specifications of the NEC B58944: : 70 nanoseconds ( -70Y suffix indicates speed
NEC B58944 (often associated with the part number D43256BGU-70Y
The existence of the "NEC" branding on a 2021-accessible datasheet also serves as a historical marker of corporate evolution. Renesas Electronics, the successor to NEC’s semiconductor business, has done a commendable job of maintaining archives, yet the "NEC" prefix remains a source of confusion for younger engineers unfamiliar with the industry's consolidation history. The datasheet stands as a testament to the original manufacturer’s standards, reminding users that despite the passage of time and changes in ownership, the fundamental physics described in the document—input/output relationships and safety tolerances—remain immutable.
The NEC B58944 is widely identified as a 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. | | 2SC2331 | Better gain, same voltage/current
| | 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 |
: A repository for PDF versions of technical manuals for older semiconductor parts. B58944 - datasheet, pdf, info, parameters, stock - Elparts
: U-series (Network/Communication) codes or internal ECU memory checksum errors (e.g., P0606). Hardware Diagnosis:
Conclusion The NEC B58944 as specified in the 2021 datasheet is a compact, efficient SMD LED suitable for a wide range of indicator and backlighting applications. Key design considerations from the datasheet include forward voltage and current ratings, luminous flux/intensity and color binning, thermal management requirements, soldering and handling guidelines, and reliability/lifetime data. For product designs, follow the datasheet’s electrical, thermal, and mechanical recommendations, select appropriate binning for color consistency, and validate parts under your application’s thermal and drive conditions.
