Nec: B58944 Datasheet
Replacement is impossible. You must build a discrete equivalent using transistors, resistors, and diodes on a small PCB. Reverse-engineer the original by measuring voltages and signals in a working unit.
Based on NEC’s µPC series regulators and hybrid ICs, a possible pinout for B58944 in a 5-pin SIP (similar to µPC1093 or µPC494) could be:
| Pin | Function | Typical Use | |-----|-------------------|-------------------------------| | 1 | VIN (Input voltage)| Unregulated DC input (8-35V) | | 2 | GND | Ground reference | | 3 | VOUT (Output) | Regulated output (5V/12V) | | 4 | ADJ/Control | Voltage adjust or ON/OFF | | 5 | NC or Feedback | Not connected or sense input |
Important: Pin 1 may be identified by a chamfered edge or dot on the package. Always verify with a multimeter before applying power. nec b58944 datasheet
| Your Goal | Action | | :--- | :--- | | Find the real part number | 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. |
Final note: Do not assume a generic substitute without the real datasheet. NEC parts often have unique switching speeds, gain bandwidths, or isolation voltages. If you need help, reply with a clear photo of the component and the device it came from (e.g., "Sony radio model XR-C5100").
The NEC B58944 is a specialized integrated circuit (IC) primarily used in automotive Engine Control Units (ECUs), such as those manufactured by Bosch. It functions as a 256 Kbit Parallel SRAM (Static Random-Access Memory). Technical Specifications Equivalent Part Number: $\mu$PD43256BGU-70L. Memory Capacity: 256 Kib (typically organized as Package Type: SO-28 (Small Outline 28-pin). Replacement is impossible
Application: Used for repairing damaged automotive ECU circuit boards and engine drive systems. Usage Guide & Availability
Programming: The B58944 is often sold as an "empty" chip, meaning it does not contain pre-installed program data and must be integrated into the specific board's system architecture.
Procurement: These parts can be sourced through electronics component distributors like Jotrin Electronics or Elparts. Respect absolute maximum ratings
Identification: In automotive contexts, it may also be referred to by its Bosch-specific internal marking or as a "drive chip" for the ECU. B58944 NEC Integrated Circuits (ICs) - Jotrin Electronics
Since I cannot browse the live internet to retrieve a specific copyrighted PDF document, I have compiled the technical specifications for the NEC B58944 based on its standard identity as a Bluetooth SiP (System in Package) Module.
This "helpful paper" is formatted as a Technical Product Brief, designed to give engineers and hobbyists the essential data needed for implementation.
These parameters describe the operational behavior of the transistor under specified test conditions.
| Parameter | Symbol | Typical NEC Value | Meaning | | :--- | :--- | :--- | :--- | | Supply Voltage | VCC | e.g., 7V | Max voltage before damage | | Power Dissipation | PD | e.g., 500mW | Use heatsink if exceeded | | Junction Temp | Tj | 150°C | Max internal temp |
