While you should always verify with the specific PDF version of the datasheet for your batch, the B58944 generally adheres to these parameters: PNP
Often marked with "B58944" in Bosch automotive applications. 2. Technical Specifications
Because these chips are prone to damage from voltage spikes or age-related failure in ECUs, they are widely sought as replacement parts for ECU board repairs. Blank State:
The NEC B58944 serves as a fast, volatile data repository inside automotive computers. In Bosch engine management systems, the central microprocessor requires high-speed access to lookup tables, operational variables, and sensor feedback loops. Because flash memory has slower rewrite cycles, parallel SRAM like the B58944 acts as the core memory driver that stores temporary working calculations while the engine is running. nec b58944 datasheet
Reliability, sourcing, and repair considerations
). The parallel bus interface ensures that data can be read from and written to the controller with minimal latency, avoiding the transmission bottlenecks common to serial SPI or I2C protocols. Pin Configuration and Package Specifications
The primary application for the NEC B58944 is as an external SRAM for the main microcontroller in a variety of . You can find this chip in ECUs from many major vehicle manufacturers, including: While you should always verify with the specific
Typical application & context
Finding the original manufacturer datasheet can be tricky for automotive-grade ICs as they are often proprietary. However, technical parameters and PDF summaries can often be found on specialized component platforms: Jotrin Electronics provides technical parameters and package details. ALLDATASHEET
: It filters out transient spikes and electrical noise from the engine bay before they reach the main CPU. Blank State: The NEC B58944 serves as a
Disclaimer: This paper is a synthesis of available technical data for the B58944 component class. Variations in firmware and hardware revisions exist. Always consult the specific manufacturer datasheet for your exact batch before production.
| 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 | $^\circ C$ |
: Used by Honda, Toyota, and various global compact vehicle platforms.