Nec B58944 Datasheet Jun 2026

Found inside ME7.4.4, ME7.5, ME7.5.10, ME7.9.6, and ME7.9.20 engine controllers.

Ensure the replacement can handle the same fTf sub cap T if used in a radio or data circuit. Conclusion

Move your hot air nozzle in a continuous circle over the chip package. Use tweezers to gently lift the chip once the solder fully liquefies. Do not force the lift, or you may tear the PCB pads. nec b58944 datasheet

: Regulating microsecond pulses to solenoids or piezoelectric injectors.

– Japanese car radios and ECUs from the late 1980s (Toyota, Nissan, Honda) often featured NEC hybrids for 8V or 5V regulation from the car battery. Found inside ME7

The B58944 operates via the .

When sourcing a replacement, use the full part number and verify the SOP-28 package. The following table lists verified suppliers. Use tweezers to gently lift the chip once

(Engine Control Unit) boards, this specialized integrated circuit (IC) is a critical component for engine management systems.

Within these circuits, the B58944 acts as an intermediary component—either serving as a dedicated high-reliability buffer memory or driving localized output logic. Because it handles continuous read/write routines and coordinates localized processing data, it is a frequent point of electrical failure when an ECU undergoes an external short circuit or thermal overload. Common Failure Modes & Diagnostics

The chip is fabricated using NEC's advanced silicon-gate CMOS technology, contributing to its high speed and low power draw.