While direct links change, the B58944 datasheet can often be found on various technical documentation platforms. To download a free copy, you can look for listings on: : Often lists the B58944 IC under NEC.
This technical analysis covers the internal architecture, absolute maximum ratings, deployment across automotive platforms, and troubleshooting methodologies for the NEC B58944. Technical Specifications and Architecture Overview
| | Pin Name | Type | Function | | :--- | :--- | :--- | :--- | | 10 | A0 | Input | Address Bus Input (LSB) - Part of 15-line bus for 32,768 locations | | 11 | A1 | Input | Address Bus Input | | 12 | A2 | Input | Address Bus Input | | ... | ... | ... | ... | | 4 | A14 | Input | Address Bus Input (MSB) | | 23 | I/O1 | Input/Output | Data Bus (Bit 0) - 8-line bidirectional bus | | 24 | I/O2 | Input/Output | Data Bus (Bit 1) | | 25 | I/O3 | Input/Output | Data Bus (Bit 2) | | 26 | I/O4 | Input/Output | Data Bus (Bit 3) | | 27 | I/O5 | Input/Output | Data Bus (Bit 4) | | 1 | I/O6 | Input/Output | Data Bus (Bit 5) | | 2 | I/O7 | Input/Output | Data Bus (Bit 6) | | 3 | I/O8 | Input/Output | Data Bus (Bit 7 - MSB) | | 20 | /CS | Input | Chip Select - Active LOW to enable chip access | | 22 | /OE | Input | Output Enable - Active LOW to drive data onto the bus | | 21 | /WE | Input | Write Enable - Active LOW to write data from the bus into memory | | 14 | VDD | Power | +5V Power Supply | | 28 | VSS | Ground | Ground (0V) | | 5, 6, 7, 8, 9, 13, 15, 16, 17, 18, 19 | NC | - | No Connect - Not internally bonded |
with a low airflow setting to prevent blowing off surrounding surface-mount resistors.
Utilized in linear or series regulators to maintain stable voltage outputs despite load fluctuations. 4. Pinout Configuration and Mechanical Data nec b58944 datasheet Free
The B58944 is not a standard NEC semiconductor part number (like a microcontroller or transistor). It is almost certainly a custom OEM part number , likely a display (LCD) or a hybrid module from a specific device (e.g., a car stereo, cash register, or industrial equipment).
Use the exact part number in your searches to filter out noise and find the correct memory chip for your repairs, whether in an automotive ECU or another embedded system.
While official NEC/Renesas legacy datasheets can be elusive, technical parameters and PDF links are hosted on Elparts and Jotrin Electronics .
: As noted by ECUFIX, new B58944 chips are "empty" and will not work unless programmed with the correct data for your specific Bosch ECU model. While direct links change, the B58944 datasheet can
Ensure the datasheet covers the SOP-28 variant to match the B58944's physical footprint.
Note: The "Commercial" temperature grade suggests this component was primarily used in vehicle infotainment or body control systems.
Connects to the common reference or ground loop.
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Several distributors list the B58944 in their inventory, including:
: Portals like AllDatasheet or DatasheetCatalog hold comprehensive original scanning sheets for NEC's entire 1990s memory lineup free of charge.
Because this IC is a "vulnerable" component (prone to failure due to thermal stress or voltage spikes), it is a common target for automotive ECU repair professionals. How to Download the NEC B58944 Datasheet for Free
Replacing an SOP-28 package requires a careful hand to avoid lifting traces from aging, multi-layered ECU motherboards.