Probe the PCB:
Pinout / functional notes (assumed from μPD43256 family)
Technicians have identified specific failure characteristics for this chip. A faulty B58944 can cause , preventing diagnostic tools from connecting to the ECU. nec b58944 datasheet
(Engine Control Unit) boards, this specialized integrated circuit (IC) is a critical component for engine management systems.
The NEC B58944 is a high-performance power semiconductor, typically classified as a N-Channel Enhancement Mode MOSFET or a specialized power transistor used in industrial and automotive applications. Finding the specific datasheet requires understanding its electrical limits and thermal characteristics to ensure system stability. Probe the PCB: Pinout / functional notes (assumed
What is the of the vehicle you are servicing?
After an extensive search of publicly available technical databases (including NEC Electronics/Renesas archives, distributor datasheet repositories, and general web indexes), no official or third-party datasheet for a component labeled exactly “B58944” could be located. This report therefore provides: The NEC B58944 is a high-performance power semiconductor,
In the automotive repair sector, the NEC B58944 is a frequent point of interest for engineers working with older generation vehicle modules. It is commonly found in:
When sourcing a replacement, use the full part number and verify the SOP-28 package. The following table lists verified suppliers.
| Parameter | Symbol | Typical Value | Unit | Test Conditions | | :--- | :---: | :---: | :---: | :--- | | Turn-on Time | $t_on$ | 0.7 | $\mu s$ | $I_C = 4A, I_B1 = 0.8A$ | | Storage Time | $t_stg$ | 4.0 | $\mu s$ | $I_C = 4A, I_B1 = 0.8A$ | | Fall Time | $t_f$ | 0.4 | $\mu s$ | $I_C = 4A, I_B1 = 0.8A$ |