Nec B58944 Datasheet «TOP-RATED»

For those looking to purchase or find detailed pinouts, parts are often listed on specialized sites like Jotrin Electronics new circuit design

At high currents, the B58944 generates significant heat. Ensure the copper trace area is sufficient or use an external aluminum heatsink.

: After opening the ECU, use a hot air rework station (set to ~350-400°C) to carefully heat the B58944's pins until the solder melts. Use fine tweezers to gently lift the chip. Alternatively, a combination of low-melt solder and a soldering iron can be used.

A critical warning for tuners: Always read and save the injector codes from the ECU before making any changes. After flashing or modifying data, these injector codes may need to be reprogrammed for the vehicle to run correctly. nec b58944 datasheet

. It acts as a buffer or temporary storage for sensor data and engine mapping. Repair and Replacement:

Reading or writing the B58944 chip often requires . Using OBD tools requires backing up injector codes separately, as they can be lost during the read/write process. Specific tools recommended for this include Kess, K-TAG, CMD, and BDM100 for BDM access, while MPPS v13/v16 can be used for OBD access but increases the risk of losing injector codes.

However, this guide will help you in two ways: For those looking to purchase or find detailed

Move your hot air nozzle in a continuous circle over the chip package. Use tweezers to gently lift the chip once the solder fully liquefies. Do not force the lift, or you may tear the PCB pads.

The device supports , maintaining memory contents with a minimal power supply of just 2.0V. This ensures vital configuration data survives engine shutdowns.

When handling an unknown component like the NEC B58944 without a datasheet: Use fine tweezers to gently lift the chip

| Parameter | Symbol | Rating | Unit | | :--- | :---: | :---: | :---: | | Collector-Base Voltage | $V_CBO$ | 1500 | V | | Collector-Emitter Voltage | $V_CEO$ | 800 | V | | Emitter-Base Voltage | $V_EBO$ | 6 | V | | Peak Collector Current | $I_CM$ | 15 | A | | Continuous Collector Current | $I_C$ | 8 | A | | Base Current | $I_B$ | 5 | A | | Power Dissipation ($T_c=25^\circ C$) | $P_C$ | 100 | W | | Junction Temperature | $T_j$ | +150 | $^\circ C$ | | Storage Temperature | $T_stg$ | -55 to +150 | $^\circ C$ |

If you are sourcing this part for hardware testing or bench repairs, components can be procured from independent international suppliers. You can review inventory quantities, package statuses, and quote requests through specialized platforms like Jotrin Electronics B58944 Database , ECUFixTool Automotive ICs , or general electronic tracking archives like Alldatasheet . Always verify that your replacement unit explicitly matches the SOP-28 package dimension to ensure it drops cleanly onto your specific Bosch ECU board version.

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