Coaxial Switch Receptacle for RF Signal Routing
The Hirose MS-151NB is a coaxial switch receptacle with a 4.15mm plug diameter, designed for RF signal routing where controlled impedance and repeatable switching matter. The internal switch feature allows signal path selection within the connector body — useful for antenna switching, band selection, or test-point isolation in compact RF assemblies. This is a surface-mount, right-angle receptacle with a female socket interface. The snap-on fastening gives a positive tactile engagement without requiring a threaded coupling nut, which saves board space and speeds assembly in high-volume production.
RF Performance and Signal Integrity
The 3 GHz frequency ceiling covers common wireless bands including cellular, Wi-Fi, and ISM applications. Insertion loss of 0.6dB means the connector contributes about 13% power loss at the rated frequency — a typical figure for a switching coaxial connector in this class. For signal budget calculations, factor this loss into the link margin, especially in multi-connector signal chains. The internal switch feature adds a mechanical switching element inside the connector body. This is not a standard coaxial pass-through — the switch position changes the signal path, so verify the switching logic (normally-open, normally-closed, or transfer) against your circuit requirements before specifying.
Mechanical and Environmental Ratings
The polyamide (nylon) dielectric maintains stable RF properties across this range. The right-angle SMT footprint requires a reflow soldering profile compatible with the nylon housing material. The shield termination is solder — the ground connection relies on a good solder fillet around the body pads for consistent RF grounding and shielding effectiveness.