B58944 Datasheet: Nec

The NEC B58944 reveals the hidden complexity of modern car electronics. On the surface, it is a simple chip, but its role ties into critical systems of security, performance, and diagnostics.

Note: "H" denotes High Logic level, "L" denotes Low Logic level, and "X" represents a "Don't Care" state. Common Automotive Diagnostic Applications

| Parameter | Specification | | :--- | :--- | | | 32,768 words × 8 bits | | Total Capacity | 262,144 bits (256 Kib) | | Access Time (Max) | 70 ns (for the -70L version) | | Supply Voltage (VCC) | 4.5 V to 5.5 V for standard operation | | Standby Current | 50 μA (max) for LL version, 3 μA (max) for L version | | Data Retention VCC | 2.0 V (min) | | Operating Ambient Temp | 0°C to 70°C (for the standard -70L version) | | Package | 28-pin Plastic SOP (450 mil / 11.43 mm wide) | nec b58944 datasheet

Because this component is a legacy automotive ASIC, direct replacements are rarely found through standard commercial catalog channels. Hardware developers and repair specialists typically source authentic new-old-stock (NOS) inventory or salvage components through vetted global platforms like Jotrin Electronics or Worldway Electronics to guarantee circuit compatibility and reliable thermal tolerances.

: Active LOW. Must be pulled low to enable the device. 22 The NEC B58944 reveals the hidden complexity of

The confirmed specification details for the NEC B58944 are limited. The following key parameters are derived from the most likely candidate for the underlying core component, the static RAM, which shares the same physical package and pin count.

The EDC16 system handles closed-loop control for common-rail diesel vehicles, managing: Must be pulled low to enable the device

Moisture entry into the ECU housing leads to pin-to-pin shorts across the parallel address lines. Replacement Rules for Technicians

The single most common use-case for sourcing the NEC B58944 is the refurbishment of .