Nec B58944 Datasheet [work] [ ORIGINAL ✰ ]
: Constant temperature cycling inside the engine bay degrades internal silicon structures over time.
The NEC B58944 datasheet provides detailed information on the IC's features and specifications. Some of the key features include:
Based on NEC’s µPC series regulators and hybrid ICs, a possible pinout for B58944 in a 5-pin SIP (similar to µPC1093 or µPC494) could be: nec b58944 datasheet
For automotive technicians and electronics enthusiasts, this chip represents a common point of failure that can lead to frustrating issues like OBD communication loss. However, thanks to its well-documented nature and continued availability from automotive part specialists, repairing a failed B58944 is a feasible task. Whether you are sourcing a replacement for a repair or looking for the technical data to understand your ECU, this guide serves as a definitive reference for the role, specifications, and datasheet of the NEC B58944.
Technically, the B58944 is an chip. It is frequently identified as an automotive-grade equivalent or a rebranded version of the μPD43256BGU-70L . Capacity: 256 Kib (32K x 8 bits). : Constant temperature cycling inside the engine bay
Architecturally, the device provides of memory organized in an 8-bit parallel configuration (
Based on its identical counterpart, the , the B58944 features the following technical characteristics: Feature Specification Memory Type CMOS Static RAM (SRAM) Capacity 256K-bit (32,768 words x 8 bits) Access Time 70 ns (indicated by the "-70" suffix) Package Type 28-pin Plastic SOP (Small Outline Package) Voltage Range 2.7 V to 5.5 V (B version) Data Retention Low VCC data retention down to 2.0 V Key Features for Automotive Use However, thanks to its well-documented nature and continued
At its core, the is a surface-mount, high-speed, 256K-bit CMOS static RAM (SRAM) device. It's specifically designed to operate within the demanding environment of a vehicle's electronic systems. The common full part number is D43256BGU-70Y , with "B58944" being a factory marking code printed on the chip's body.
Specific diagnostic trouble codes (DTCs) referencing ECU internal circuit faults, driver stage errors, or RAM/ROM test failures.
The is a specialized automotive integrated circuit (IC) predominantly recognized as an Engine Control Unit (ECU) memory driver chip . Manufactured by NEC Electronics (now part of Renesas Electronics), it functions as a 256 Kibit Parallel Static Random-Access Memory (SRAM) chip equivalent to the standard industry part number μPD43256BGU-70L .