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Skyworks Solutions Inc. RFX8051B
- Part No.:
- RFX8051B
- Manufacturer:
- Skyworks Solutions Inc.
- Category:
- RF Front End (LNA + PA)
- Package:
- 16-UFQFN Exposed Pad
- Datasheet:
-
RFX8051B.pdf
- Description:
- IC FRONT END MOD 5GHZ WLAN 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,406
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Product details
Overview
RFX8051B from Skyworks Solutions is a CMOS 5GHz WLAN 802.11ac RF front-end integrated circuit (RFeIC) integrating PA, LNA with bypass, SPDT switch, harmonic filters, and directional-coupler-based power detector. It operates in the 5.15–5.85 GHz band, delivers +16.5 dBm linear output power (MCS9/80MHz), features 50-Ω matched I/O, and targets space-constrained mobile Wi-Fi systems.
For engineers reviewing the RFX8051B datasheet, RFX8051B pinout, RFX8051B application, or RFX8051B equivalent, key selection considerations include its single-die 5GHz RFeIC integration, low-voltage CMOS control logic (1.2–3.3 V), 3.0×3.0×0.55 mm QFN-16 package, +2.8 dB noise figure, and 12.5 dB LNA gain - all critical for 802.11ac smartphone and tablet RF front-end design.
Technical Context
The RFX8051B implements a fully integrated transmit/receive path with separate TX and RX transceiver ports and a shared antenna port, enabling full-duplex 5GHz WLAN operation via internal SPDT switching. Its architecture includes on-chip matching, LO rejection, and harmonic filtering - eliminating external baluns, filters, and matching components.
Control logic uses three CMOS inputs (TXEN, RXEN, LEN) to select among four operational modes: shutdown, transmit, LNA receive, and LNA bypass - with sub-microsecond switching times (0.4 µs) and <3 µA shutdown current. All RF ports are DC-short to ground, and VDD pins include internal RF decoupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range | 5.15–5.85 GHz - fully covers IEEE 802.11a/n/ac U-NII bands without external tuning. |
| Linear Output Power | +16.5 dBm @ MCS9/80MHz - meets EVM <1.8% requirement for 802.11ac high-throughput transmission. |
| LNA Gain / NF | 12.5 dB gain, 2.8 dB noise figure - enables high-sensitivity 5GHz receive performance in compact layouts. |
| Power Detector Range | 200–1500 mV output for +5 to +20 dBm antenna power - supports closed-loop TX power control without external coupler. |
| Supply Voltage | 3.0–3.6 V - compatible with standard mobile system rails; control logic accepts 1.2–3.3 V logic levels. |
| Package | 3.0 × 3.0 × 0.55 mm QFN-16 with exposed thermal pad - enables ultra-thin PCB designs and efficient thermal dissipation. |
| ESD Protection | HBM ±2 kV on all pins - ensures robust handling and board-level reliability in consumer assembly environments. |
Pinout & Package
RFX8051B is housed in a 3.0 × 3.0 × 0.55 mm, 16-lead QFN package with exposed ground pad for thermal and electrical performance. Pin 1 is marked by a dot; recommended PCB land pattern includes nine 0.3 mm thermal vias under the pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 9, 11 | NC | Internally not connected - may be tied to GND on PCB for mechanical stability or EMI reduction. |
| 2 | RX | LNA output or bypass path to transceiver - DC shorted to GND; requires 50-Ω termination at receiver input. |
| 4, 10 | VDD | Primary DC supply pins - each supplies bias to internal blocks; internal RF decoupling reduces external capacitor count. |
| 5 | DET | Analog power detector output - voltage proportional to PA output power; used for real-time TX power monitoring/control. |
| 6 | TXEN | CMOS enable input for transmit mode - "High" activates PA and disconnects LNA; "Low" disables PA. |
| 7, 12, 14, 17 | GND | Ground terminals - must be connected to low-impedance system ground plane; critical for RF return path integrity. |
| 8 | TX | RF input from transceiver - DC shorted to GND; 50-Ω matched for direct connection to Wi-Fi baseband IC. |
| 13 | ANT | Shared antenna port - carries PA output during TX or LNA/bypass input during RX; DC shorted to GND. |
| 15 | RXEN | CMOS enable for receive path - "High" enables LNA or bypass path depending on LEN state. |
| 16 | LEN | CMOS LNA enable/bypass control - "High" enables LNA; "Low" places LNA in bypass mode for high-power signal handling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PA + LNA + SPDT | Single-die 5GHz RFeIC eliminates discrete RF front-end layout complexity and interconnect loss. |
| On-chip power detector | Directional coupler-based DET pin enables accurate, temperature-stable TX power feedback without external couplers or ADCs. |
| LNA bypass mode | 6 dB insertion loss and +16 dBm input P1dB allow robust operation under strong interferers without LNA saturation. |
| Full on-chip matching | 50-Ω matched TX, RX, and ANT ports reduce bill-of-materials and eliminate external matching networks. |
| Ultra-low control current | 1 µA typical DC control pin current and 3 µA shutdown current minimize system standby power consumption. |
Applications
| Smartphone 5GHz Wi-Fi Front-End | Tablet WLAN Module Integration |
|---|---|
Use Scenario: Compact 5GHz MIMO antenna interface in thin-profile smartphones requiring high-efficiency transmit and low-noise receive. IC Role / Device Role / Timing Role: Single-chip RFeIC providing PA amplification, LNA reception, antenna switching, and power monitoring for 802.11ac PHY layer. Use Value: Reduces front-end footprint by >40% vs. discrete solutions while maintaining +16.5 dBm linear output and 2.8 dB NF. | Use Scenario: Integrated 5GHz Wi-Fi subsystem in Android/iOS tablets where PCB area and thermal density are constrained. IC Role / Device Role / Timing Role: RF front-end controller managing TX/RX path selection, power control, and LNA bypass under dynamic interference conditions. Use Value: Enables seamless 802.11ac operation across U-NII-1/2A/2C/3 bands with no external matching or filtering components required. |
| Wi-Fi Media Gateway RF Stage | Ultrabook Wireless Subsystem |
Use Scenario: High-reliability 5GHz client connectivity in home media gateways operating continuously in thermally limited enclosures. IC Role / Device Role / Timing Role: Primary RF front-end delivering stable +16 dBm output and <3 dB NF across -40°C to +85°C ambient range. Use Value: Maintains EVM compliance and link margin over temperature due to integrated harmonic filtering and on-chip bias regulation. | Use Scenario: Low-power 5GHz Wi-Fi coexistence in fanless ultrabooks with strict TDP and EMI budgets. IC Role / Device Role / Timing Role: Energy-efficient RFeIC supporting rapid TX/RX mode transitions (<0.4 µs) and <150 mA TX quiescent current. Use Value: Extends battery life via 3 µA shutdown current and eliminates need for external LDOs or sequencers in RF power management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 5GHz WLAN RFeIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Qorvo QPF4551 | SiGe process; higher PA P1dB (+26 dBm); no integrated power detector; 3.0×3.0 mm QFN-16 | Targets higher-output access points; lacks on-chip power sensing for closed-loop control | Choose when maximum output power is prioritized over integrated monitoring and mobile power efficiency |
| Qualcomm WTR5975 | Integrated with transceiver; supports multi-band LTE/Wi-Fi coexistence; proprietary control interface | Designed for Qualcomm reference platforms; not standalone drop-in replacement | Choose only within Qualcomm-based designs requiring tight RF/baseband integration |
Compared with QPF4551 and WTR5975, the RFX8051B uniquely balances +16.5 dBm 802.11ac linear output, 2.8 dB NF, integrated power detection, and ultra-low control current - making it optimal for cost- and space-sensitive 5GHz client devices where autonomous TX power calibration and thermal efficiency are essential.
Availability
RFX8051B is available at Aetrix Electronics and suitable for smartphone Wi-Fi front-ends, tablet wireless modules, and ultrabook WLAN subsystems requiring stable component supply, consistent RF performance across production lots, and long-term lifecycle support.
Supply support for RFX8051B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Skyworks Solutions is a global leader in high-performance analog semiconductors for wireless, broadband, automotive, and industrial markets, with expertise in RF front-end design and CMOS integration.
The RFX8051B belongs to Skyworks' RFeIC product line, engineered specifically for highly integrated, low-footprint 5GHz WLAN front-ends in mobile and portable consumer electronics.
FAQ
What is the operating frequency range supported by the RFX8051B?
The RFX8051B supports the full 5.15–5.85 GHz band, covering all U-NII sub-bands required for IEEE 802.11a/n/ac operation. This includes U-NII-1 (5.15–5.25 GHz), U-NII-2A (5.25–5.35 GHz), U-NII-2C (5.47–5.725 GHz), and U-NII-3 (5.725–5.85 GHz). The device maintains specified linear output power, gain flatness, and noise figure across this entire range without external tuning components.
Does the RFX8051B require external matching components for 50-Ω interfaces?
No, the RFX8051B does not require external matching components. It integrates full on-chip matching networks for TX, RX, and ANT ports, ensuring 50-Ω input/output impedance across its operating band. This eliminates discrete baluns, capacitors, and inductors traditionally needed in discrete RF front-ends, reducing PCB area and assembly cost while improving repeatability.
How does the RFX8051B handle strong out-of-band interferers in receive mode?
The RFX8051B handles strong interferers using its LNA bypass mode, activated when LEN = "Low" and RXEN = "High". In this mode, insertion loss is 6 dB and input P1dB is +16 dBm - allowing the device to pass high-amplitude signals without LNA compression or distortion. This preserves receiver dynamic range in dense RF environments such as urban Wi-Fi deployments.
What is the function of the DET pin on the RFX8051B?
DET is an analog voltage output proportional to the RF power delivered to the antenna port during transmit. It provides 200–1500 mV for +5 to +20 dBm output power into a 10 kΩ load, enabling real-time closed-loop TX power control without external directional couplers or ADCs. This simplifies calibration and improves transmit accuracy across temperature and voltage variations.
Can the RFX8051B operate from a 3.0 V supply rail?
Yes, the RFX8051B is fully specified for operation from 3.0 V to 3.6 V on all VDD pins. At 3.0 V, it maintains +16 dBm linear output power (MCS9/80MHz), 12.5 dB LNA gain, and 2.8 dB noise figure. Control logic remains functional down to 1.2 V high-level threshold, supporting compatibility with 1.8 V and 3.3 V GPIO interfaces.
RFX8051B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Skyworks Solutions Inc.
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- RF Type:
- 802.11a/n/ac
- Frequency:
- 5.15GHz ~ 5.85GHz
- Features:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-QFN (3x3)
RFX8051B FAQ
1.How can I place an order for RFX8051B through Aetrix?
Please submit a Request for Quotation (RFQ) for RFX8051B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for RFX8051B reliable?
The price and inventory of RFX8051B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RFX8051B is usually 5 days.
3.What payment methods are accepted for RFX8051B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RFX8051B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for RFX8051B?
RFX8051B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your RFX8051B order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for RFX8051B?
For technical support, including RFX8051B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RFX8051B requirements.
6.How does Aetrix verify that RFX8051B is sourced from the original manufacturer or authorized distributors?
All RFX8051B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that RFX8051B meets industry standards.
7.What is the process for return or replacement of RFX8051B?
All RFX8051B units undergo pre-shipment inspection (PSI). If there is an issue with RFX8051B, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The RFX8051B part is unused and in its original packaging.
Return procedure for RFX8051B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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