NB4N121KMNG

Clock Buffers, Drivers Overview

The NB4N121KMNG is a single-channel fanout buffer manufactured by Fairchild Semiconductor, now part of onsemi. It provides a 1:21 distribution ratio with differential input and output capabilities. The device supports multiple input logic standards including CML, LVCMOS, LVDS, LVPECL, and LVTTL, while generating HCSL outputs. It operates at a maximum frequency of 400 MHz with a supply voltage range of 3V to 3.6V. The component is housed in a 52-VFQFN package with an exposed pad, suitable for surface mount applications within an operating temperature range of -40°C to 70°C.

Clock Buffers, Drivers Feature Summary

• 1:21 Fanout Buffer with differential input/output
• Supports CML, LVCMOS, LVDS, LVPECL, and LVTTL inputs
• HCSL Output type
• Maximum Frequency: 400 MHz

Clock Buffers, Drivers Applications

• Clock distribution networks
• High-speed data communication systems
• Server and storage backplanes

Clock Buffers, Drivers Procurement Notes

This component is marked as obsolete and no longer manufactured. Verification of availability should focus on surplus or stock suppliers rather than direct manufacturer channels. Confirm the specific revision level and RoHS compliance status when sourcing from secondary markets, as production end-of-life documentation may affect long-term supply stability.

Clock Buffers, Drivers Selection Notes

Select this component for designs requiring a single-input to twenty-one-output clock distribution with mixed-mode input compatibility. Ensure the PCB layout accommodates the 52-QFN (8x8) package dimensions and thermal requirements. Verify that the system power supply remains within the 3V to 3.6V range to maintain signal integrity and operational reliability at frequencies up to 400 MHz.

Clock Buffers, Drivers Part Context

The NB4N121KMNG belongs to the NB4N121 family of clock buffers. Fairchild Semiconductor was acquired by onsemi, which continues to manage the product lifecycle. This specific part number represents the tray-packaged version of the device. Equivalent parts such as the NB4N121KMNR2G exist within the same family, offering different packaging options for the same core functionality.

Clock Buffers, Drivers Replacement Considerations

Public confirmed substitute part numbers include NB4N121KMNR2G.