| Parameter | Specification | Notes | | :--- | :--- | :--- | | | D43256BGU-70Y / µPD43256BGU-70L | "B58944" is the marking code. | | Memory Type | CMOS Static RAM (SRAM) | Does not require refreshing. | | Memory Size | 256 Kbit | Organized as 32,768 words x 8 bits (32KB). | | Supply Voltage (Vcc) | 4.5V to 5.5V | Designed for standard 5V logic systems in automotive ECUs. | | Access Time | 70 ns (nanoseconds) | The "-70" in the part number indicates a fast 70ns access speed. | | Operating Current | Low power consumption | Crucial for managing heat in sealed ECU enclosures. | | Standby Current | Very low (CMOS) | Helps preserve vehicle battery when the ignition is off. | | Operating Temperature | 0°C to +70°C | Suitable for automotive-grade applications. | | Package / Pin Count | SOP-28 (Small Outline Package) | A 28-pin, surface-mount package. |

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

Because the original is classified as a proprietary manufacturer document, finding public, pin-by-pin factory specifications can be difficult. This comprehensive technical guide synthesizes structural, functional, and replacement data to support electronics engineers and automotive repair professionals. Technical Specifications Overview

The B58944 is engineered for high-speed switching and low on-state resistance (

): Low junction-to-case resistance to allow for massive heat transfer to a heatsink. Common Applications

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC

: Find the exact part number on the original chip ( NEC B58944 ). Cross-reference with the SOP-28 package type.

: An internal short circuit can cause the B58944 to ground an injector continuously, flooding a cylinder with fuel. Repair Best Practices

The NEC B58944 is engineered for the rigorous high-temperature and electrically noisy environments found in vehicle engine bays. It bridges the main microcontroller and peripheral engine components, handling vital data processing or signaling.

: Write Enable and Output Enable signals that regulate data flow timing to prevent collision on the ECU's internal bus. Primary Applications: Bosch EDC16 Repair

Rth(j−c)cap R sub t h of open paren j minus c close paren end-sub

The is a specialized Integrated Circuit (IC) primarily used in automotive Engine Control Units (ECUs) , specifically for BOSCH engine computer systems. It is often identified alongside the part number D43256BGU-70Y , which designates it as a specific type of high-speed CMOS static RAM chip frequently adapted for automotive driver applications. Technical Summary

The B58944 operates via the .

High-speed Parallel SRAM requiring dedicated address and data buses for instantaneous read/write cycles.

You can find the B58944 through specialized electronic component distributors such as Jotrin Electronics , Worldway Electronics , or UTSOURCE . Share public link

(The exact unbranded native component) Alliance Memory AS6C62256-70SIN Cypress Semiconductor CY62256NLL-70SNXI

This "helpful paper" is formatted as a , designed to give engineers and hobbyists the essential data needed for implementation.

What specific is the module presenting?

Since I cannot browse the live internet to retrieve a specific copyrighted PDF document, I have compiled the technical specifications for the based on its standard identity as a Bluetooth SiP (System in Package) Module .

The is a specialized, proprietary automotive integrated circuit (IC) predominantly recognized under its standard semiconductor designation, D43256BGU-70Y . Manufactured by NEC Electronics (now part of Renesas Electronics), this device functions as a 32K x 8-bit Static Random-Access Memory (SRAM) . It is widely used in automotive applications, specifically for repairing and rebuilding Engine Control Units (ECUs) and Powertrain Control Modules (PCMs).

Nec B58944 Datasheet [extra Quality] Jun 2026

| Parameter | Specification | Notes | | :--- | :--- | :--- | | | D43256BGU-70Y / µPD43256BGU-70L | "B58944" is the marking code. | | Memory Type | CMOS Static RAM (SRAM) | Does not require refreshing. | | Memory Size | 256 Kbit | Organized as 32,768 words x 8 bits (32KB). | | Supply Voltage (Vcc) | 4.5V to 5.5V | Designed for standard 5V logic systems in automotive ECUs. | | Access Time | 70 ns (nanoseconds) | The "-70" in the part number indicates a fast 70ns access speed. | | Operating Current | Low power consumption | Crucial for managing heat in sealed ECU enclosures. | | Standby Current | Very low (CMOS) | Helps preserve vehicle battery when the ignition is off. | | Operating Temperature | 0°C to +70°C | Suitable for automotive-grade applications. | | Package / Pin Count | SOP-28 (Small Outline Package) | A 28-pin, surface-mount package. |

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

Because the original is classified as a proprietary manufacturer document, finding public, pin-by-pin factory specifications can be difficult. This comprehensive technical guide synthesizes structural, functional, and replacement data to support electronics engineers and automotive repair professionals. Technical Specifications Overview

The B58944 is engineered for high-speed switching and low on-state resistance (

): Low junction-to-case resistance to allow for massive heat transfer to a heatsink. Common Applications

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC nec b58944 datasheet

: Find the exact part number on the original chip ( NEC B58944 ). Cross-reference with the SOP-28 package type.

: An internal short circuit can cause the B58944 to ground an injector continuously, flooding a cylinder with fuel. Repair Best Practices

The NEC B58944 is engineered for the rigorous high-temperature and electrically noisy environments found in vehicle engine bays. It bridges the main microcontroller and peripheral engine components, handling vital data processing or signaling.

: Write Enable and Output Enable signals that regulate data flow timing to prevent collision on the ECU's internal bus. Primary Applications: Bosch EDC16 Repair

Rth(j−c)cap R sub t h of open paren j minus c close paren end-sub | Parameter | Specification | Notes | |

The is a specialized Integrated Circuit (IC) primarily used in automotive Engine Control Units (ECUs) , specifically for BOSCH engine computer systems. It is often identified alongside the part number D43256BGU-70Y , which designates it as a specific type of high-speed CMOS static RAM chip frequently adapted for automotive driver applications. Technical Summary

The B58944 operates via the .

High-speed Parallel SRAM requiring dedicated address and data buses for instantaneous read/write cycles.

You can find the B58944 through specialized electronic component distributors such as Jotrin Electronics , Worldway Electronics , or UTSOURCE . Share public link

(The exact unbranded native component) Alliance Memory AS6C62256-70SIN Cypress Semiconductor CY62256NLL-70SNXI | | Supply Voltage (Vcc) | 4

This "helpful paper" is formatted as a , designed to give engineers and hobbyists the essential data needed for implementation.

What specific is the module presenting?

Since I cannot browse the live internet to retrieve a specific copyrighted PDF document, I have compiled the technical specifications for the based on its standard identity as a Bluetooth SiP (System in Package) Module .

The is a specialized, proprietary automotive integrated circuit (IC) predominantly recognized under its standard semiconductor designation, D43256BGU-70Y . Manufactured by NEC Electronics (now part of Renesas Electronics), this device functions as a 32K x 8-bit Static Random-Access Memory (SRAM) . It is widely used in automotive applications, specifically for repairing and rebuilding Engine Control Units (ECUs) and Powertrain Control Modules (PCMs).