Nec B58944 Datasheet =link= Jun 2026

The NEC B58944 is engineered primarily as an . Within an automotive ECU, the chip bridges the gap between the vehicle’s low-power microcontroller logic and high-power physical actuators, such as fuel injectors, solenoids, relays, and ignition modules.

Tell me whether you have a scanned PDF or a photo of the part marking, or confirm the exact package and full part code. I can then locate the precise datasheet numbers (pinout tables, absolute max values, detailed electrical characteristics) and produce a component-specific summary, BOM notes, and recommended schematic snippets.

Because the NEC B58944 is supplied as an unprogrammed, hardware-level drive component, it does not hold a separate vehicle software image. Replacing a damaged chip does require you to re-flash or clone the vehicle’s specific immobilizer or tuning maps. You simply need to perform a precise hardware transplant.

If you are performing a repair, would you like help finding or compatible replacement guides for this specific ECU? NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC

: 70 nanoseconds (ns) maximum time window from address stabilization to valid data output (derived from the -70L / -70Y nomenclature). Supply Voltage ( VCCcap V sub cap C cap C end-sub ) : Normally operates on a regulated power plane. nec b58944 datasheet

: Used for repairing damaged automotive ECU circuit boards and engine drive systems. Usage Guide & Availability

According to its technical parameters, the B58944 offers reliability in demanding environments: SOP-28 (Small Outline Package). Memory Size: 256 Kib. Architecture: Parallel SRAM.

Architecturally, the device provides of memory organized in an 8-bit parallel configuration (

[Apply Flux to Pins] ──> [Apply Hot Air (350°C)] ──> [Lift Chip Safely] │ [Inspect/Align New IC] <── [Clean PCB Pads with Wick] <──────┘ │ └──> [Drag Solder Pins] ──> [Clean with IPA] ──> [Bench Test] The NEC B58944 is engineered primarily as an

Isopropyl alcohol (99% concentration) and an ESD-safe brush. Step-by-Step Rework Procedure

: Standard TTL and CMOS input/output thresholds. Power Dissipation : Ultra-low low-power standby mode (

What (e.g., oscilloscope, multimeter) you have available.

Report generated for informational purposes. Always verify component identities with original manufacturer documentation when available. I can then locate the precise datasheet numbers

The is a specialized integrated circuit (IC) primarily used as an SRAM memory chip or driver within automotive Engine Control Units (ECUs), particularly those manufactured by Bosch . It is widely recognized in automotive repair circles as a common point of failure in vehicle computers for brands like Honda, Mercedes-Benz, and Volvo. Key Specifications & Equivalents Part Number: B58944

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:

While proprietary datasheets remain tightly controlled, the 28-pin SOP package layout aligns with standard industrial memory and driver pinouts used by Bosch configurations:

RDS(on)cap R sub cap D cap S open paren o n close paren end-sub