NEC discontinued many legacy components after the Renesas merger. Consequently, older part numbers like the B58944 are often:
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B58944 NEC Integrated Circuits (ICs) - Jotrin Electronics nec b58944 datasheet Free
The B58944 is frequently sold as an meaning it does not contain pre-programmed software or data. If you are replacing this in an ECU, you may need to transfer or flash the existing firmware from the old chip to the new one for the engine to function. NEC B58944 ECU DRIVER SOP-28 - Inovauto.com NEC B58944 ECU DRIVER SOP-28. Inovauto.com NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC NEC discontinued many legacy components after the Renesas