Nec B58944 Datasheet |verified| Free Page
The primary function of the NEC B58944 is to store volatile runtime data for vehicle engine telemetry. If you are retrofitting or replacing this component, the foundational data profile mirrors standard high-speed CMOS static RAM:
: If an engine module experiences sudden memory drops, fails to hold adaptive learning parameters, or throws internal RAM checksum errors, the B58944 is typically the point of physical hardware failure.
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Apply high-quality liquid tack flux generously across both rows of pins. Use a hot-air rework station set between 340°C and 360°C with low airflow to prevent blowing surrounding SMD resistors out of place. Gently lift the IC once the solder liquefies completely. nec b58944 datasheet Free
Used heavily in common-rail diesel commercial vehicles and vans, including the EDC16 Iveco and EDC16 S10 Nova.
: The vehicle diagnostics scan tool displays a "No Connection to ECU" error.
Because it's custom, NEC/Renesas will not have a public datasheet. You will need to search by application. The primary function of the NEC B58944 is
Note: Always use insulation hardware (mica washers and thermal grease) when mounting the metal tab to a shared chassis or heatsink to prevent short circuits. 5. Where to Download the NEC B58944 Datasheet for Free
: Decodes which of the 32,768 memory addresses the ECU is targeting.
Check obsolete inventory specialists or distributors who maintain extensive documentation libraries for legacy repair operations. This link or copies made by others cannot be deleted
Though proprietary, benchmarking the B58944 against industry-standard automotive SOP-28 multi-channel drivers provides its core operating boundaries: 1. Absolute Maximum Ratings (Handles load-dump transients from car alternators). Output Current ( IOUTcap I sub cap O cap U cap T end-sub ): per channel (Depending on individual pin configuration). Operating Junction Temperature ( TJcap T sub cap J ): -40∘Cnegative 40 raised to the composed with power C +150∘Cpositive 150 raised to the composed with power C 2. Built-In Fault Protections
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Because the underlying core is a 32K x 8 SRAM, the SOP28 pinout layout maps consistently to standard JEDEC configurations for 256K SRAMs. Below is the technical pin breakdown required for circuit probing or board-level replacement: Pin Number Signal Name Description A0 – A14 Address Lines (15 lines required to address 32K locations) 11-13, 15-19 I/O1 – I/O8 Input/Output Data Lines (8-bit bi-directional data bus) 14 Ground Reference 20 /CE or /CS Chip Enable / Chip Select (Active Low) 22 Output Enable (Active Low) 27 Write Enable (Active Low) 28 Main Power Supply (+5V Typical for legacy automotive) Critical Applications in Automotive Diagnostics
: Typically provided as an "empty" chip, meaning it requires external programming or data flashing specific to the vehicle's engine map before it can function.
