Nec B58944 Datasheet =link= -

The chip functions as an automotive engine drive or memory-related component within the ECU. It is a critical part of the circuit board responsible for managing engine computer operations.

The chip is fabricated using NEC's advanced silicon-gate CMOS technology, contributing to its high speed and low power draw.

: It is integrated into several generations of Bosch hardware, including the ME7.4.4, ME7.5, ME7.5.10, ME7.9.6, ME7.9.20, EDC7, and EDC16 ECU platforms. These modules manage engine mapping across common consumer vehicle brands like Volkswagen, Audi, Honda, and Iveco.

The NEC B58944 is sold as an "empty chip". This means it depends entirely on the surrounding hardware architecture or internal flashing systems to step into the circuit seamlessly. Required Tools Hot air rework station set between 340°C and 360°C. Fine-tip soldering iron. High-quality tacky rosin flux. Solder wick (desoldering braid).

Technical Specifications and Application Overview for the B58944 Transistor Component Type: High-Voltage, High-Speed Switching Power Transistor Manufacturer: NEC (now Renesas Electronics) nec b58944 datasheet

Before moving on, it's crucial to clarify a common point of confusion. The identical string "B58944" is also used to classify an manufactured by Borosil Scientific, designed for lab analysis of fine crystalline precipitates. While this is an interesting coincidence, it is completely unrelated to the IC we are discussing.

The chip's physical format is a . The dimensions are consistent with the JEDEC standard for this package, with a pin spacing (pitch) of 1.27mm. It is also known by other physical codes such as SOP28 or SO28 .

Interfaces with the central processor to manage read, write, and driver activation timings.

When handling the B58944 chip, use an and appropriate tools: The chip functions as an automotive engine drive

Check the chip's clock inputs or output lines. Flatline signals during active CPU polling point to an internal component failure. Replacement and Repair Instructions

: After replacement and programming, reinstall the ECU in the vehicle and use a professional diagnostic scanner to check for fault codes and perform any necessary system calibrations (e.g., throttle body alignment, injector coding).

The standard operational parameters for this device class include: Specification NEC (Now Renesas Electronics) Legacy automotive semiconductor line. Package Type SOP-28 (Small Outline Package) Surface-mount device with 28 pins. Cross-Reference D43256BGU-70Y High-speed static RAM variant architecture. Target Systems Bosch Engine Management (ME7 / EDC16) Standard automotive platform integration. Access Time 70ns (Inferred from -70Y suffix) Typical for vintage automotive SRAM/Driver chips. Pinout Configuration and Signal Behavior

: Use solder wick (desoldering braid) and a soldering iron to clear the PCB pads. Clean the area thoroughly with isopropyl alcohol (IPA). : It is integrated into several generations of

Found in power management sub-circuits for 1990s-era hardware. Finding a Replacement

Verify inventory, component lead times, and quote requests via global aggregators like Jotrin Electronics or UTSource .

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.

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.