The requests increased. People came with increasingly fragile needs: a town petitioning to keep the sound of church bells that weather had erased; a factory that wanted the exact shiver of a welder’s rhythm from a foreman who had died; a grieving mother wanting a single word restored to the last voicemail from her son. Mara could not help them all. 9e102 had limits. Its exchanges were finite; each restoration left both the restored object and the module itself changed. Memories accumulated in its ceramic like barnacles. It grew heavier to the touch.
To achieve optimal performance, the datasheet recommends using specific external components around the BD9E102FJ. A typical application circuit includes:
Switching node output. Connects directly to the external power inductor. Pin 4 (GND): Power and analog ground reference.
A minority of component listings also show a device labeled simply “9E102” in an SOP-8 package, with specifications distinct from the BD9E102FJ. However, the overwhelming majority of references to “9e102 datasheet” lead directly to the ROHM BD9E102FJ. 9e102 datasheet
(commonly laser-etched simply as on the physical chip package) serves as an efficient power management tool designed to deliver stable low-voltage tracks from high-voltage inputs. Electrical Performance Parameters Input Voltage Range ( VINcap V sub cap I cap N end-sub ) : 4.5V to 28V Output Voltage Range ( VOUTcap V sub cap O cap U cap T end-sub ) : 1.0V adjustable up to Maximum Output Current : 1A continuous Switching Frequency ( fSWf sub cap S cap W end-sub
) : Typically fixed at 550 kHz, adaptive across 300 kHz to 1.2 MHz : 90 mΩ (Typical) Low-Side MOSFET On-Resistance : 70 mΩ (Typical) Quiescent Current ( IQcap I sub cap Q ) : 10 µA Operating Supply Current : 290 µA
The series consists of ultra-miniature, octal (8-position) DIP switches designed for use on printed circuit boards (PCBs). These switches are typically used for logic configuration, address selection, and mode settings in electronic systems. The requests increased
Understanding the pinout and internal architecture is essential for board layout and troubleshooting.
Note: For multi-tap versions, each tap output toggles sequentially with the specified increment.
The datasheet sat in the dark at the back of a drawer, its lines now part legend, part warning. The story of 9e102 lived not only in metal and ceramic but in the few people who had chosen to treat memory like more than fuel. They argued, sometimes, about what the right choices had been. They argued until the arguments themselves became part of the world the module had helped stabilize—a world that would, like any other, be remembered or forgotten according to the small, stubborn acts of people who still chose to care. 9e102 had limits
You may encounter the number sequence 9E102 in a completely unrelated context: .
When searching for "9e102", it is crucial to use the full manufacturer part numbers to ensure you get the correct device. There are two primary variants of the IC, plus an evaluation board, all available in different packaging options.