SKY 58255-11 Mobile Phone IC
The SKY 58255-11 Mobile Phone IC is a high-performance Sky5® Ultra-High Band (UHB) Front-End Module (FEM) manufactured by Skyworks Solutions. Designed specifically for 5G New Radio (NR) and 4G LTE-Advanced applications, it is a critical component in modern smartphones (often paired with Snapdragon processors) to manage complex signal paths across diverse frequency bands. SKY 58255-11 Mobile Phone IC
1. Core Technical Overview
The SKY58255-11 is more than a simple chip; it is a highly integrated PAMiD (Power Amplifier Module with integrated Duplexers). It combines Power Amplifiers (PA), Low Noise Amplifiers (LNA), antenna switches, and filtering into a single, compact surface-mount package. Its primary role is to ensure that your mobile device can transmit data efficiently (TX) and receive weak signals clearly (RX) even in high-interference environments. SKY 58255-11 Mobile Phone IC
2. Full Technical Specifications
The following table provides a comprehensive breakdown of the SKY58255-11’s electrical, physical, and operational parameters.
| Parameter Category | Technical Specification | Details / Values |
| General Info | Manufacturer | Skyworks Solutions, Inc. |
| Product Name | Sky5® Front-End Module for LTE and NR | |
| Part Number | SKY58255-11 | |
| Frequency & Radio | Supported Standards | 5G NR, 4G LTE, LTE-Advanced |
| Frequency Bands | B42, B43, B48, n77, n78, n79 | |
| Bandwidth Support | Up to 100 MHz (CP-OFDM & DFTS-OFDM) | |
| MIMO Support | 2×2 UL-MIMO (using dual TX placements) | |
| Impedance | 50 $\Omega$ (Fully Matched I/O) | |
| Architecture | Internal Components | PA Blocks, LNAs, ASM (Antenna Switch), Filters |
| PA Cores | Two ET/APT PA cores | |
| LNA Gain Modes | Integrated LNA with up to 7 gain modes | |
| Control Interface | MIPI® RFFE v2.1 compliant (52 MHz bus) | |
| Power & Electrical | Supply Voltage (Vcc) | 0.5 V to 5.5 V (Adjustable for APT/ET) |
| Control Voltage | 1.2 V (Standard MIPI RFFE) | |
| Efficiency Mode | Average Power Tracking (APT) & Envelope Tracking (ET) | |
| Leakage Current | Extremely low (optimized for standby time) | |
| Physical | Package Type | 42-pad Surface Mount (SMT) |
| Dimensions | 4.5 mm x 5.5 mm x 0.7 mm | |
| Grounding | Integrated 20-pad ground array | |
| Environmental | Operating Temp | -30°C to +110°C |
| Storage Temp | -30°C to +150°C |
3. Key Functional Features
Multi-Band UHB Support
This IC is specifically tuned for Ultra-High Band (UHB) frequencies. This is vital for 5G “Sub-6GHz” performance, particularly for the n77 and n78 bands which are the backbone of global 5G rollouts. SKY 58255-11 Mobile Phone IC
SRS Hopping Capability
One of the standout features of the SKY58255-11 is its support for Fast Sounding Reference Signal (SRS) Hopping. This allows the network to evaluate the channel quality across multiple antennas rapidly, significantly improving upload speeds and link reliability. SKY 58255-11 Mobile Phone IC
Baseband Agnostic Design
Skyworks has designed this module to be “Baseband Agnostic.” This means it can interface with various chipset platforms (Qualcomm, MediaTek, Samsung Exynos) without requiring extensive redesign, making it a favorite for global smartphone manufacturers. SKY 58255-11 Mobile Phone IC
4. Application and Usage
The SKY58255-11 is predominantly found in:
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Flagship & Mid-range 5G Smartphones: It acts as the “bridge” between the RF Transceiver and the device antenna.
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5G Telematics Units: Used in automotive applications for high-speed vehicle-to-everything (V2X) communication.
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Mobile Hotspots: Providing the high-speed UHB backbone for portable 5G routers.
Note for Repair Technicians:
This IC is a BGA (Ball Grid Array) component. Because it manages high frequencies and power, it is sensitive to moisture. If you are replacing this chip, it is recommended to bake the component at 100°C–110°C for 24 hours if it has been exposed to air for an extended period to prevent “popcorning” during the soldering process.
5. Pinout & Port Summary
While a full 42-pad map is complex, the module generally follows this logic:
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ANT1/ANT2: Two selectable primary antenna ports.
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AUX1–AUX6: Six auxiliary ports used for SRS Hopping and RX diversity.
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TX_IN / RX_OUT: High-speed differential or single-ended lines to the RF Transceiver.
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MIPI SDATA/SCLK: Digital control lines for switching bands and adjusting gain.
The SKY58255-11 is a high-performance Sky5® Ultra-High Band (UHB) Front-End Module (FEM) manufactured by Skyworks Solutions. Designed specifically for 5G New Radio (NR) and 4G LTE-Advanced applications, it is a critical component in modern smartphones (often paired with Snapdragon processors) to manage complex signal paths across diverse frequency bands
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