Nec B58944 Datasheet
The NEC B58944's main role is in a car's ECU, where it likely serves as a data buffer or scratchpad. Its core function is to manage and act as a Double Channel Solid-State Relay (IC Relay) —these are electronically controlled switches that turn power on and off to various automotive systems on the "high side" (the +12V side) of the load. The table below lists known ECUs.
[Apply Flux to Pins] ──> [Apply Hot Air (350°C)] ──> [Lift Chip Safely] │ [Inspect/Align New IC] <── [Clean PCB Pads with Wick] <──────┘ │ └──> [Drag Solder Pins] ──> [Clean with IPA] ──> [Bench Test]
Delivers a stable +5V regulated power rail from the ECU's main power management IC. nec b58944 datasheet
: SOP / SOP-28 (Small Outline Package) or BGU (SOP variation), optimized for compact, vibration-resistant surface mounting on automotive PCBs. Hardware Specifications & Pin Configuration
Practical summary for repair/modification The NEC B58944's main role is in a
: Low-profile, surface-mount design featuring gull-wing leads for secure solder joint inspection on automotive multi-layer PCBs. Pinout Functional Mapping
To download the full technical datasheet for the B58944, search for its base model number, . This document will contain the complete electrical characteristics, timing diagrams, and physical dimensions. You can find it on any major datasheet website, such as Alldatasheet.com , Datasheet4U.com , or directly from the manufacturer's (now Renesas Electronics) archive. Some specific pages to check include: [Apply Flux to Pins] ──> [Apply Hot Air
) : -40°C to +85°C (Standard industrial/automotive lower-tier threshold) : -65°C to +150°C Timing and Truth Table Operation
At its core, the is a surface-mount, high-speed, 256K-bit CMOS static RAM (SRAM) device. It's specifically designed to operate within the demanding environment of a vehicle's electronic systems. The common full part number is D43256BGU-70Y , with "B58944" being a factory marking code printed on the chip's body.
While a dedicated, single datasheet for the "B58944" itself is not available, the component is well-documented under its primary part number, the series. You can use this information to find the relevant documentation. Here are the core specifications you would find in its datasheet:
NEC part numbers generally follow structured formats. does not match common NEC logic families (e.g., µPD for microcontrollers, 2SC/2SA for transistors, or Dxxxx for diodes). It resembles: