NEC’s semiconductor division merged with Renesas in 2010. Submit a part number inquiry through Renesas’s customer support portal. Provide photos of the component and any surrounding PCB markings.
When sourcing a replacement, use the full part number and verify the SOP-28 package. The following table lists verified suppliers.
: 70 nanoseconds (indicated by the -70 suffix), matching the rapid read/write cycles required by automotive processing units.
: Clean the area with isopropyl alcohol and a brush. Apply a thin, even layer of flux to the empty pads. Finally, use solder wick and a clean soldering iron tip to remove residual solder, leaving the pads flat and clean. nec b58944 datasheet
The NEC B58944 operates as a multi-channel driver or specialized application-specific integrated circuit (ASIC). While standard commercial components carry generic alphanumeric naming conventions, parts prefixed with proprietary designations like "B58944" are typically customized for tier-1 automotive suppliers. Characteristic Value / Standard Target NEC Electronics (Renesas) Package Type SOP-28 (Small Outline Package, 28-Lead) Primary Application
Because these chips are frequently targeted for repairs when an ECU fails, finding the right technical data is essential for a successful fix. Technical Specifications
Tack down two opposite corner pins to hold the chip in place. Apply flux along both rows, then use a drag-soldering technique to secure the remaining pins. NEC’s semiconductor division merged with Renesas in 2010
Stalling, non-starting, or intermittent sensor errors can sometimes be traced back to a damaged B58944 chip. ECU Board Repair:
– Many NEC monitors (e.g., Multisync series) used 7-pin SIP ICs for H-out or V-out pre-drivers. The B58944 could be a replacement for defective vertical output ICs like LA7830 or TDA1170.
| Category | Example NEC Parts | B58944 Similarity | |------------------------|-----------------------------|-------------------| | Bipolar transistor | 2SB589 (PNP, if existed) | Possible, but no record of 2SB589 | | Diode array | D58944 | Not standard | | Custom ASIC / Hybrid | B5xxxx series (some hybrids) | Most likely | | Date/lot code | B58944 on package surface | Not a datasheet part number | When sourcing a replacement, use the full part
While full internal schematics for proprietary automotive chips are rarely released to the public, technical parameters and stock availability can be found through industrial suppliers:
. It acts as a buffer or temporary storage for sensor data and engine mapping. Repair and Replacement:
In automotive field environments, the NEC B58944 is exposed to voltage transients, thermal cycles, and moisture ingress. Technicians working with platform repair tools frequently encounter a few signature failure modes:
Understanding the NEC B58944: A Technical Overview If you are hunting for the , you are likely working with legacy telecommunications equipment or specialized industrial electronics. NEC (now part of Renesas Electronics in many segments) produced a vast array of semiconductors, and the B58944 remains a critical component for maintaining older hardware.
: One or more injectors fail to pulse because the internal channel driver inside the SOP-28 package has burned out.