Nec B58944 Datasheet File

: Low-profile, surface-mount design featuring gull-wing leads for secure solder joint inspection on automotive multi-layer PCBs. Pinout Functional Mapping

The B58944 features a standard asynchronous SRAM footprint. It separates the address bus, data bus, and control lines to ensure straightforward interfacing with 8-bit, 16-bit, or 32-bit automotive microcontrollers. Pinout Description (Standard 28-Pin SOP) Pin Number Function Type Description A0 – A14 Address Inputs : Selects one of the 32,768 memory locations. 11 - 13, 15 - 19 I/O1 – I/O8 Input/Output

The primary direct equivalent is the , with other -LL (very low power) versions like the UPD43256BGU-70LL also potentially compatible depending on power requirements.

According to its technical parameters, the B58944 offers reliability in demanding environments: SOP-28 (Small Outline Package). Memory Size: 256 Kib. Architecture: Parallel SRAM. nec b58944 datasheet

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

Ensure the Emitter-Base-Collector sequence matches your PCB. Gain ( hFEh sub cap F cap E end-sub ): Try to stay within 10% of the original NEC rating.

If you have the physical component, provide clear photographs of all markings and the surrounding PCB to electronics forums (e.g., EEVblog, Badcaps) for crowd-sourced identification. Pinout Description (Standard 28-Pin SOP) Pin Number Function

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.

Typically rated at 70ns (indicated by the "-70" suffix). Manufacturer: NEC Electronics (now Renesas). Automotive Applications

NEC B58944 Datasheet: Comprehensive Guide to the 10k NTC Thermistor Memory Size: 256 Kib

The is an integrated circuit primarily used as a static random-access memory (SRAM) chip in automotive Engine Control Units (ECUs). It is commonly found in Bosch-manufactured ECUs for vehicles like Honda, Iveco, and various European models. Technical Specifications

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.

While full internal schematics for proprietary automotive chips are rarely released to the public, technical parameters and stock availability can be found through industrial suppliers:

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

Stalling, non-starting, or intermittent sensor errors can sometimes be traced back to a damaged B58944 chip. ECU Board Repair: