Nec B58944 Datasheet ★ Verified

The "B58944" designation is a Bosch-specific house part number. The original manufacturer part is the NEC $\mu$PD43256BGU-70Y Component Type : 256K-bit CMOS Static RAM (SRAM). Configuration : 32K words : SOP-28 (Small Outline Package with 28 pins). Speed Grade : 70ns access time (indicated by the "-70" suffix). Supply Voltage : Typically 5V (standard for the $\mu$PD43256 series). Datasheet Documentation NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC

Technicians have identified specific failure characteristics for this chip. A faulty B58944 can cause , preventing diagnostic tools from connecting to the ECU.

Resistance is low (e.g., at 100°C, R ≈ 680Ω). 3. Top Applications for the B58944 nec b58944 datasheet

| Your Goal | Action | | :--- | :--- | | | Look for a shorter code on the component (e.g., "C945", "A733"). Ignore "B58944" if it appears as a single line. | | Get the datasheet | Search that shorter code + "NEC" on Alldatasheet. | | Understand the datasheet | Focus on Absolute Max, Electrical Characteristics, and Pinout. | | Still no datasheet? | The part is likely a custom-marked OEM component. Find the device's service manual instead. |

Operating the component beyond these thresholds can cause permanent silicon degradation or immediate failure. : -0.5V to +7.0V Input/Output Voltage ( VINcap V sub cap I cap N end-sub VOUTcap V sub cap O cap U cap T end-sub ) : -0.5V to Operating Temperature ( TAcap T sub cap A The "B58944" designation is a Bosch-specific house part

| Supplier | Part Number Offered | Additional Notes | | :--- | :--- | :--- | | | B58944 | Lists as Infineon; verify specs | | Centralitas Ecu | Circuito integrado B58944 | Verified automotive ECU supplier | | Buy360 | NEC B58944 D43256BGU-70Y | Includes Bosch body computer IC | | Mekweb (Elparts) | μPD43256BGU-70L | NEC Electronics, SO-28 package | | Win-Source | UPD43256BGU-70Y-E2 | Renesas Electronics |

Since the NEC B58944 is a discontinued part, you will generally not find it from major distributors like Mouser or DigiKey. Instead, your best sources are specialized and online marketplaces . For instance, retailers like CentralitasECU.com list the "B58944 D43256BGU-70Y" as a new component for ECU repair. Important Note : The price for a genuine, new old stock (NOS) or high-quality salvaged B58944 can vary significantly. Some parts listed as "new" might be pulls from recycled ECUs. For example, one Taiwanese electronics supplier lists the price at around 116 TWD (~$3.70 USD) . Speed Grade : 70ns access time (indicated by

When sourcing a replacement, use the full part number and verify the SOP-28 package. The following table lists verified suppliers.

The "B58944" designation is a Bosch-specific house part number. The original manufacturer part is the NEC $\mu$PD43256BGU-70Y Component Type : 256K-bit CMOS Static RAM (SRAM). Configuration : 32K words : SOP-28 (Small Outline Package with 28 pins). Speed Grade : 70ns access time (indicated by the "-70" suffix). Supply Voltage : Typically 5V (standard for the $\mu$PD43256 series). Datasheet Documentation NEC B58944 D43256BGU-70Y BOSCH Auto ECU computer IC

Technicians have identified specific failure characteristics for this chip. A faulty B58944 can cause , preventing diagnostic tools from connecting to the ECU.

Resistance is low (e.g., at 100°C, R ≈ 680Ω). 3. Top Applications for the B58944

| Your Goal | Action | | :--- | :--- | | | Look for a shorter code on the component (e.g., "C945", "A733"). Ignore "B58944" if it appears as a single line. | | Get the datasheet | Search that shorter code + "NEC" on Alldatasheet. | | Understand the datasheet | Focus on Absolute Max, Electrical Characteristics, and Pinout. | | Still no datasheet? | The part is likely a custom-marked OEM component. Find the device's service manual instead. |

Operating the component beyond these thresholds can cause permanent silicon degradation or immediate failure. : -0.5V to +7.0V Input/Output Voltage ( VINcap V sub cap I cap N end-sub VOUTcap V sub cap O cap U cap T end-sub ) : -0.5V to Operating Temperature ( TAcap T sub cap A

| Supplier | Part Number Offered | Additional Notes | | :--- | :--- | :--- | | | B58944 | Lists as Infineon; verify specs | | Centralitas Ecu | Circuito integrado B58944 | Verified automotive ECU supplier | | Buy360 | NEC B58944 D43256BGU-70Y | Includes Bosch body computer IC | | Mekweb (Elparts) | μPD43256BGU-70L | NEC Electronics, SO-28 package | | Win-Source | UPD43256BGU-70Y-E2 | Renesas Electronics |

Since the NEC B58944 is a discontinued part, you will generally not find it from major distributors like Mouser or DigiKey. Instead, your best sources are specialized and online marketplaces . For instance, retailers like CentralitasECU.com list the "B58944 D43256BGU-70Y" as a new component for ECU repair. Important Note : The price for a genuine, new old stock (NOS) or high-quality salvaged B58944 can vary significantly. Some parts listed as "new" might be pulls from recycled ECUs. For example, one Taiwanese electronics supplier lists the price at around 116 TWD (~$3.70 USD) .

When sourcing a replacement, use the full part number and verify the SOP-28 package. The following table lists verified suppliers.