Nec B58944 Datasheet 2021 [better]

The NEC B58944 (often cross-referenced as the $\mu$PD43256BGU-70L or D43256BGU-70Y) is a specialized Static RAM (SRAM) integrated circuit primarily utilized as an ECU driver or memory chip within automotive engine control units.

While the original NEC semiconductor line has transitioned under Renesas, the B58944 remains available through specialized electronic component distributors and ECU repair services. nec b58944 datasheet 2021

Integrated circuits > Memories > SRAM > Parallel. eq. μPD43256BGU-70L. NEC Electronics. SO-28. Size = 256 Kib. B58944 NEC Integrated Circuits (ICs) - Jotrin Electronics eq. μPD43256BGU-70L. NEC Electronics.

: The "-70" suffix in its equivalent part number ($\mu$PD43256BGU- Y) indicates an access time of nec b58944 datasheet 2021

As of 2021 and moving into 2026, the B58944 remains a "legacy yet essential" part. Because these chips are often custom-made for Tier 1 automotive suppliers like Bosch, they are typically sourced through specialized distributors rather than general consumer electronics retailers.

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