Nec B58944 Datasheet [portable]

NEC B58944 a specialised integrated circuit (IC) primarily used as a memory component in automotive Engine Control Units (ECUs) , specifically those manufactured by

You can find replacements on AliExpress and eBay for relatively low costs.

256 Kibibits organized uniformly into a 32K x 8-bit architecture .

: Parallel SRAM, allowing for direct and fast data retrieval by the host microcontroller. Applications and Repair

Because these chips are prone to damage from voltage spikes or age-related failure in ECUs, they are widely sought as replacement parts for ECU board repairs. Blank State: nec b58944 datasheet

Because the B58944 is an "empty chip" (it does not contain pre-installed vehicle software but rather acts as hardware), it is a popular choice for technicians performing . When an ECU fails due to memory corruption or driver malfunction, replacing this IC can often restore the unit to full functionality without requiring a complete (and expensive) module replacement.

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.

Scrub away any leftover flux residue to prevent future moisture corrosion. Inspect your work under magnification to confirm there are no solder bridges between adjacent pins. Purchasing and Sourcing Tips

engine control units (ECUs). These ECUs are the "brains" of diesel engines in popular vehicles like the Volvo XC70 NEC B58944 a specialised integrated circuit (IC) primarily

Found inside heavy-duty diesel modules like the EDC7 and EDC16 platforms used by Iveco.

Always use a gate resistor to dampen oscillations and protect against voltage spikes.

It functions as an automotive engine drive chip or memory interface within the ECU.

Examine the SOP-28 package pins using a microscope to look for solder fatigue or thermal discoloration. Applications and Repair Because these chips are prone

The B58944 features a standard asynchronous SRAM footprint. It separates the address bus, data bus, and control lines to ensure straightforward interfacing with 8-bit, 16-bit, or 32-bit automotive microcontrollers. Pinout Description (Standard 28-Pin SOP) Pin Number Function Type Description A0 – A14 Address Inputs : Selects one of the 32,768 memory locations. 11 - 13, 15 - 19 I/O1 – I/O8 Input/Output

While proprietary Bosch schematics map these pins to internal ECU architecture, the underlying template establishes the fundamental pin distribution for a 28-pin parallel SRAM: Description Functional Role A0 – A14 Address Inputs Selects one of the specific 8-bit memory locations. I/O1 – I/O8 Data Inputs / Outputs Bi-directional 8-bit bus used to read or write byte data. /CE (or /CS) Chip Enable / Select

: Typically +5V DC (+/- 10%) for automotive logic systems. Absolute Maximum Ratings

Like all MOSFETs, this component is sensitive to static electricity. Handle with proper grounding.

: Used by Honda, Toyota, and various global compact vehicle platforms.