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This guide is for informational purposes. Specifications may vary. Consult official manufacturer documentation before making design decisions.
is a 1-channel buck DC/DC converter with integrated MOSFETs (High-Side: 250mΩ, Low-Side: 200mΩ). It is designed to step down a high input voltage (up to 26V) to a lower, stable output voltage, making it ideal for systems running on 12V or 24V DC rails. Its ability to operate at 570 kHz allows for the use of smaller external inductors and capacitors, significantly reducing board space. Key Features
1.0 mH (Millihenries) or 1000 µH (Microhenries) for inductors; or 1k Ohm for resistors (though 102 is most common for inductors in this series). Tolerance: ±10% or ±20% (Standard M or K tolerance).
While I couldn't find a specific datasheet for the 9E102, here are some general characteristics that are typical of Hall Effect sensors: 9e102 datasheet
Featuring a compact footprint, the 9E102 is available in both Surface Mount (SMT) and Through-Hole (THT) termination styles, utilizing high-reliability contacts and a durable housing suitable for automated assembly processes.
The SOP-J8 package has a on the pin 1 side. ROHM datasheets provide detailed mechanical drawings showing the orientation. Some distributors also provide PCB footprint and symbol resources for CAD tools like DesignSpark PCB.
: If you suspect a 1000pF capacitor, download the datasheet for "Generic SMD MLCC Series 0805 X7R 50V" and look for the order code ending in 102K or 102J . The "9e" is often a packaging or internal tracking code, not part of the generic datasheet.
To download the complete 32-page BD9E102FJ-FJ datasheet, visit reputable component distributors or the official ROHM Semiconductor website. : This guide is for informational purposes
Operates at a fixed switching frequency, typically between 484 kHz and 656 kHz, which helps balance component size and efficiency.
Stable 19V at the VIN pin but 0V at the output rails.
Careful attention to PCB layout is required: the input capacitors should be placed as close as possible to the VIN and GND pins to minimize parasitic inductance, and the feedback (FB) trace should be routed away from the SW node to prevent noise coupling.
A 10μH - 22μH inductor is typically chosen based on the required output current and ripple voltage requirements. COUTcap C sub cap O cap U cap T end-sub is a 1-channel buck DC/DC converter with integrated
The 9E102 is ideal for applications requiring precise, repeatable time delays without complex clocking or microcontrollers.
An unrelated but notable usage of the string “9E102” appears in European Union export control regulations. Under Council Regulation (EC) No 428/2009, “9E102” is a classification code for related to unmanned aerial vehicles (UAVs) capable of a range exceeding 300 km. This has no technical relation to the BD9E102FJ or the “9E102 SOP-8” component. However, engineers working in export-controlled environments should be aware of the distinction to avoid confusion.
Includes Under Voltage Lockout (UVLO), Over Current Protection (OCP), and Thermal Shutdown (TSD).