SKY85743-31

SKY85743-31 is a Skyworks RF front-end module (FEM) used in mobile/wireless devices. It is a highly integrated package that combines key RF functions (such as Tx/Rx switch networks and related passive components) to support multiple cellular bands in a compact form, reducing PCB space and BOM.
Key points:
- Part of the SKY8574x/857x family; the “-31” suffix encodes a specific option set (band/configuration) within the family.
- Integrated RF switching, with high isolation between transmit and receive paths; designed for LTE/5G front-end use.
- External biasing and control pins from the baseband/controller; designed for easy integration with minimal external components.
- Small, low-profile packaging suitable for smartphones, modules, or hotspots.
- Requires reference design materials and an evaluation board for optimal performance.
Applications:
- Mobile devices, modems, hotspots, and other compact wireless equipment requiring a compact, multi-band RF front-end.
For exact band coverage, electrical specs, pinout, and evaluation hardware, consult the SKY85743-31 datasheet and Skyworks’ reference designs.

SKY85743-31 uses a 3x3 mm QFN surface-mount package.

Pin count: 32 pins (QFN-32).
Function: Skyworks SKY85743-31 is a GNSS front-end module (GPS L1) with integrated RF front-end components (LNA, matching network/filter, and bias control) for GPS/GNSS signal reception.

Manufacturer: Skyworks Solutions, Inc.
What kind of company: A fabless semiconductor company that designs and supplies RF front-end modules and other wireless communication ICs for mobile devices and infrastructure (e.g., smartphones, IoT, base stations).

Applications for SKY85743-31 include:
- Mobile devices (smartphones, tablets, hotspots) for LTE/5G front-end
- Automotive telematics and infotainment systems
- Industrial IoT gateways and sensors
- Base stations and small cells, RF modules needing band switching
- GNSS receivers and multi-band RF front-ends; RF test equipment

Equivalents depend on the target bands and features. SKY85743-31 is a Skyworks front-end module (PA/LNA/Switch) from the SKY857x family. There isn’t a universal direct cross-reference. To identify exact substitutes, please specify target LTE/5G bands, required functions (PA/LNA/Switch/Filter), and package/footprint. I can then provide precise cross-references from datasheets (including other SKY857x variants or compatible FE modules from other vendors).