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Home > Products > RF and Wireless > RF Front End (LNA + PA)

Skyworks Solutions Inc. SE5502L-R

Name: SE5502L-R
Brand: Skyworks Solutions Inc.
SKU: SE5502L-R
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SE5502L-R

Manufacturer:: Skyworks Solutions Inc.

Category:: RF Front End (LNA + PA)

Package:: 24-VFQFN Exposed Pad

Datasheet:: SE5502L-R.pdf

Description:: IC FRONTEND MOD 802.11N DL 24QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SE5502L-R from Skyworks Solutions is a dual-band 802.11a/b/g/n WLAN front-end module integrating 2.4 GHz and 5 GHz power amplifiers, T/R switch, LNAs, diplexers, notch filters, and dual-channel power detectors. It delivers 21 dBm at 2.4 GHz (802.11b), 18 dBm at 2.4 GHz (802.11g), and 16 dBm at 5 GHz (802.11a), all with ≤3% EVM, and operates from a single 3.3 V supply in a 4 mm × 4 mm QFN-24 package for compact access point and PC card designs.

For engineers reviewing the SE5502L-R datasheet, SE5502L-R pinout, SE5502L-R application, or SE5502L-R equivalent, key selection considerations include its integrated dual-band PA/LNA/switch architecture, 50 Ω matched RF ports, 20 dB dynamic range power detection per chain, sub-μs TX ramp control, and MSL-1 RoHS-compliant QFN packaging - critical for high-density 802.11n client and infrastructure RF layout.

Technical Context

The SE5502L-R implements a fully integrated dual-path RF front-end: separate 2.4 GHz and 5 GHz transmit chains each feature a dedicated PA, LNA, and digital enable (ENg/ENa), while shared antenna switching is controlled via C0/C1 logic to configure T/R mode, LNA bypass, or standby. Each TX path includes a built-in power detector with 0–22 dBm detection range and 1.5 MHz low-pass filtering.

It incorporates band-specific notch filtering - 3.260–3.267 GHz before the 2.4 GHz PA and 3.28–3.89 GHz before the 5 GHz PA - to suppress adjacent-band interference. The device supports simultaneous dual-band operation only in time-multiplexed mode, as confirmed by the exclusive ENg/ENa activation logic table and absence of concurrent TX/RX specification.

Key Specifications

Parameter	Value and Actual Design Meaning
Frequency Bands	2.4–2.5 GHz and 4.9–5.875 GHz - covers full 802.11b/g/n (2.4 GHz) and 802.11a/n (5 GHz) operational bands
Output Power	21 dBm @ 2.4 GHz (802.11b), 18 dBm @ 2.4 GHz (802.11g), 16 dBm @ 5 GHz (802.11a) - meets regulatory spectral mask and EVM requirements
Power Detection Range	0–22 dBm (2.4 GHz), 0–21 dBm (5 GHz) - enables closed-loop TX power control with 20 dB dynamic range per chain
Supply Voltage	3.0–3.6 V (typ. 3.3 V) - compatible with standard 3.3 V system rails; ±10% tolerance simplifies regulator selection
TX Ramp Time	<0.7 μs rise/fall - satisfies 802.11n OFDM packet timing constraints and minimizes spectral regrowth
Noise Figure	2.5–2.8 dB (2.4 GHz), 2.8–3.0 dB (5 GHz) - preserves receiver sensitivity in dense interference environments
Package	4 mm × 4 mm × 0.9 mm QFN-24, lead-free, halogen-free, RoHS compliant, MSL-1 - supports automated SMT assembly and thermal management

Pinout & Package

The SE5502L-R is housed in a 4 mm × 4 mm × 0.9 mm, 24-pin QFN package with exposed thermal pad (pin 12), RoHS-compliant e3 terminal finish, and MSL-1 rating. All RF pins are internally matched to 50 Ω, eliminating external matching components and reducing PCB footprint.

Pin/Terminal	Circuit Role	Design Meaning
C0	2.4/5 GHz Switch Control	Selects 2.4 GHz RX path, 5 GHz RX path, or LNA bypass mode per logic table; high-impedance input with 3.0–3.6 V ON threshold
Rg	2.4 GHz RF Receive Output	Connects to transceiver's 2.4 GHz RX port; provides 15 dB typical gain with 2.5 dB NF when LNA enabled
Ra	5 GHz RF Receive Output	Connects to transceiver's 5 GHz RX port; provides 12 dB typical gain with 2.8 dB NF when LNA enabled
Tg	2.4 GHz RF Transmit Input	Accepts 2.4 GHz TX signal from transceiver; drives internal PA delivering up to 21 dBm with ACPR < −35 dBc
Ta	5 GHz RF Transmit Input	Accepts 5 GHz TX signal from transceiver; drives internal PA delivering up to 16 dBm at 3% EVM
Det	Dual-Band Power Detector Output	Analog voltage output (0.35–0.85 V) proportional to TX power on either band; used for real-time power calibration
ENa	5 GHz PA Enable	CMOS-compatible digital control (0 V / 3.3 V) enabling/disabling 5 GHz PA; <0.5 μs delay to RF output
ENg	2.4 GHz PA Enable	CMOS-compatible digital control enabling/disabling 2.4 GHz PA; independent of ENa for band-selective operation
VCC	Supply Voltage (×4 pins)	Four dedicated 3.3 V supply pins (pins 9,10,11,23) reduce IR drop and improve PSRR across high-current TX modes
ANT	Antenna Interface	Single-port antenna connection supporting both bands via internal SP3T switch; includes integrated diplexing and notch filtering
GND	Ground (×12 pins)	Twelve ground pins (pins 13–22, plus thermal pad) ensure low-inductance return paths and stable RF performance
C1	2.4/5 GHz Switch Control	Complements C0 to define full switch state (T/R, LNA bypass, standby); logic levels match C0 specifications

Key Features

Feature	Design Value
Dual-band integrated PA + LNA + T/R switch	Eliminates 12+ discrete RF components per band, reducing BOM count, layout area, and matching complexity in dual-band WLAN designs
50 Ω matched RF ports	Enables direct connection to transceiver RFIC without external matching networks - cuts design cycle time and improves yield consistency
Dual-channel power detector	Provides independent analog voltage feedback for each TX chain over 20 dB range, enabling precise closed-loop power control without external couplers
Sub-μs TX power ramp	Ensures compliance with 802.11n packet timing requirements (≤1 μs ramp) and minimizes spectral splatter during burst transmission
Built-in band-selective notch filters	Rejects 3.26–3.27 GHz and 3.28–3.89 GHz interference before PA stages, preventing desensitization and improving ACLR in co-located systems

Applications

Access Points	PCMCIA / Mini-PCI Cards
Use Scenario: Dual-band enterprise Wi-Fi access points requiring simultaneous 2.4 GHz and 5 GHz client support with minimal RF front-end footprint. IC Role / Device Role / Timing Role: Front-end RF interface between WLAN baseband IC and antenna; handles PA amplification, LNA reception, band switching, and TX power monitoring. Use Value: Reduces bill-of-materials by integrating two complete RF chains into one 4 mm × 4 mm package, enabling higher channel density in compact AP enclosures.	Use Scenario: Portable laptop WLAN cards needing low-power, high-efficiency dual-band operation with fast TX enable/disable for battery-sensitive applications. IC Role / Device Role / Timing Role: Single-chip RF front-end providing 2.4 GHz and 5 GHz transmit/receive paths with independent digital enable controls for rapid band switching. Use Value: Achieves 18 dBm at 2.4 GHz and 16 dBm at 5 GHz with ≤3% EVM using only 3.3 V supply, extending battery life without sacrificing throughput.
Wireless Routers	IoT Gateways
Use Scenario: Consumer-grade dual-band routers where cost, size, and time-to-market constrain RF subsystem complexity. IC Role / Device Role / Timing Role: Integrated front-end replacing discrete PA, LNA, switch, and filter assemblies; supports IEEE 802.11a/b/g/n standards out-of-the-box. Use Value: Enables production-ready RF design with no impedance matching required - accelerates prototyping and reduces validation effort.	Use Scenario: Smart home gateways aggregating multiple wireless protocols, requiring robust 2.4 GHz/5 GHz WLAN connectivity alongside Bluetooth or Zigbee. IC Role / Device Role / Timing Role: High-isolation dual-band front-end with notch filtering to mitigate interference from adjacent radios operating near 3.3–3.9 GHz. Use Value: Maintains >10 dB return loss across both bands and suppresses out-of-band energy, ensuring reliable coexistence in multi-radio environments.

Access Points

PCMCIA / Mini-PCI Cards

Use Scenario: Dual-band enterprise Wi-Fi access points requiring simultaneous 2.4 GHz and 5 GHz client support with minimal RF front-end footprint.

IC Role / Device Role / Timing Role: Front-end RF interface between WLAN baseband IC and antenna; handles PA amplification, LNA reception, band switching, and TX power monitoring.

Use Value: Reduces bill-of-materials by integrating two complete RF chains into one 4 mm × 4 mm package, enabling higher channel density in compact AP enclosures.

Use Scenario: Portable laptop WLAN cards needing low-power, high-efficiency dual-band operation with fast TX enable/disable for battery-sensitive applications.

IC Role / Device Role / Timing Role: Single-chip RF front-end providing 2.4 GHz and 5 GHz transmit/receive paths with independent digital enable controls for rapid band switching.

Use Value: Achieves 18 dBm at 2.4 GHz and 16 dBm at 5 GHz with ≤3% EVM using only 3.3 V supply, extending battery life without sacrificing throughput.

Wireless Routers

IoT Gateways

Use Scenario: Consumer-grade dual-band routers where cost, size, and time-to-market constrain RF subsystem complexity.

IC Role / Device Role / Timing Role: Integrated front-end replacing discrete PA, LNA, switch, and filter assemblies; supports IEEE 802.11a/b/g/n standards out-of-the-box.

Use Value: Enables production-ready RF design with no impedance matching required - accelerates prototyping and reduces validation effort.

Use Scenario: Smart home gateways aggregating multiple wireless protocols, requiring robust 2.4 GHz/5 GHz WLAN connectivity alongside Bluetooth or Zigbee.

IC Role / Device Role / Timing Role: High-isolation dual-band front-end with notch filtering to mitigate interference from adjacent radios operating near 3.3–3.9 GHz.

Use Value: Maintains >10 dB return loss across both bands and suppresses out-of-band energy, ensuring reliable coexistence in multi-radio environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-band WLAN front-end applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Qorvo QPF4519	Higher 5 GHz POUT (19 dBm vs. 16 dBm), integrated 5 GHz LNA bypass, but no 2.4 GHz LNA bypass; uses different pinout and control logic.	Optimized for 5 GHz-heavy use cases (e.g., mesh backhaul); less suitable for legacy 2.4 GHz-only clients due to lower 2.4 GHz gain flatness.	Prefer QPF4519 when 5 GHz throughput and ACLR are prioritized over 2.4 GHz legacy compatibility.
Skyworks SKY85720-31	Same manufacturer, pin-compatible upgrade with improved 5 GHz EVM (2.5% vs. 3.0%) and extended frequency coverage (up to 5.925 GHz); identical 4 mm × 4 mm QFN-24 package.	Direct drop-in replacement for new designs targeting Wi-Fi 6 readiness; maintains full backward compatibility with 802.11a/b/g/n.	Choose SKY85720-31 for next-generation designs requiring Wi-Fi 6 support and tighter EVM margins without layout changes.

Compared with QPF4519, SE5502L-R offers superior 2.4 GHz legacy support and simpler control logic; compared with SKY85720-31, it lacks Wi-Fi 6 optimization but remains cost-effective for mature 802.11n deployments requiring proven reliability and broad ecosystem support.

Availability

SE5502L-R is available at Aetrix Electronics and suitable for access points, PCMCIA cards, wireless routers, and IoT gateways requiring stable component supply, consistent RF performance, and long-term obsolescence management.

Supply support for SE5502L-R 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, specializing in RF, mobile, and infrastructure solutions with emphasis on integration, efficiency, and miniaturization.

The SE5502L-R belongs to Skyworks' WLAN front-end module product line, engineered specifically to consolidate dual-band 802.11a/b/g/n RF functionality - including PA, LNA, switch, filtering, and detection - into a single, layout-optimized QFN package for space-constrained client and infrastructure devices.

FAQ

What is the operating temperature range for the SE5502L-R?

The SE5502L-R is rated for an ambient operating temperature range of −40 °C to +85 °C, as specified in the recommended operating conditions section of the datasheet. This industrial-grade range supports deployment in consumer, enterprise, and outdoor-access-point environments. All electrical characteristics - including output power, gain, noise figure, and power detector linearity - are guaranteed across this full range when operated within the defined supply voltage (3.0–3.6 V) and RF input conditions. The SE5502L-R also features MSL-1 moisture sensitivity, enabling robust reflow processing without bake-out.

Does the SE5502L-R support simultaneous dual-band transmission?

No, the SE5502L-R does not support true simultaneous dual-band transmission. Its functional block diagram and switch control logic table confirm that ENg and ENa are mutually exclusive - only one PA can be active at a time. The device operates in time-multiplexed mode, switching between 2.4 GHz and 5 GHz bands under host controller direction. Concurrent TX/RX is also prohibited; the SP3T switch routes ANT to either Tg/Ta (TX) or Rg/Ra (RX), not both. This architecture aligns with standard 802.11n MAC layer scheduling, not Wi-Fi 6E or tri-band requirements.

How is the power detector output calibrated for use with a microcontroller ADC?

The SE5502L-R power detector outputs a DC voltage (e.g., 0.35 V at no RF, 0.65 V at 16 dBm, 0.85 V at 21 dBm) with 2.7–3.0 kΩ output impedance and 1.5 MHz low-pass bandwidth. For ADC interfacing, a simple RC filter (e.g., 10 kΩ + 100 pF) suffices to suppress switching noise. Calibration requires measuring VDET at two known power levels (e.g., 0 dBm and 18 dBm) across temperature, then applying linear interpolation: POUT (dBm) = m × VDET + b. The slope (m) is ~0.032 V/dBm in the 0–22 dBm range. This calibration must be performed per unit due to ±5% detector gain variation.

What are the absolute maximum ratings for the SE5502L-R supply voltage and RF inputs?

The SE5502L-R has an absolute maximum supply voltage (VCC) of −0.3 V to +3.6 V; exceeding +3.6 V risks permanent damage. RF inputs (Ta, Tg, ANT) tolerate up to +12 dBm under worst-case 6:1 VSWR load conditions. Exceeding this may cause irreversible degradation. All digital control pins (ENa, ENg, C0, C1) share the same −0.3 V to +3.6 V absolute limit. ESD protection is rated at 1000 V HBM per JEDEC JESD22-A114. Operation outside recommended conditions - such as VCC < 3.0 V or ambient > 85 °C - is not guaranteed and may result in degraded gain, increased noise figure, or unstable switching behavior.

Can the SE5502L-R be used in Wi-Fi 6 (802.11ax) systems?

The SE5502L-R was designed and characterized for 802.11a/b/g/n operation and is not qualified for Wi-Fi 6 (802.11ax). While it supports the same 2.4 GHz and 5 GHz bands, it lacks the enhanced EVM performance (<1.5% at MCS11), wider 160 MHz channel support, and OFDMA-specific linearity required by 802.11ax. Datasheet specifications cap EVM at 3.0% for 64-QAM, and small-signal gain variation exceeds Wi-Fi 6 tolerances above 80 MHz bandwidth. Skyworks recommends SKY85720-31 or QPF4559 for Wi-Fi 6 designs. The SE5502L-R remains suitable for legacy 802.11n systems where cost, footprint, and proven reliability are primary drivers.

SE5502L-R Specifications

Product attributes: Attribute value

Manufacturer:: Skyworks Solutions Inc.

Series:: SiGe

Packaging:: Tape & Reel (TR)

Product Status:: Active

RF Type:: 802.11a/b/g/n

Frequency:: 2.4GHz ~ 2.5GHz, 4.9GHz ~ 5.875GHz

Features:: -

Grade:: -

Qualification:: -

Supplier Device Package:: 24-QFN (4x4)

SE5502L-R FAQ

1.How can I place an order for SE5502L-R through Aetrix?

Please submit a Request for Quotation (RFQ) for SE5502L-R 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 SE5502L-R reliable?

The price and inventory of SE5502L-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SE5502L-R is usually 5 days.

3.What payment methods are accepted for SE5502L-R?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SE5502L-R transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SE5502L-R?

SE5502L-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SE5502L-R 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 SE5502L-R?

For technical support, including SE5502L-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SE5502L-R requirements.

6.How does Aetrix verify that SE5502L-R is sourced from the original manufacturer or authorized distributors?

All SE5502L-R 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 SE5502L-R meets industry standards.

7.What is the process for return or replacement of SE5502L-R?

All SE5502L-R units undergo pre-shipment inspection (PSI). If there is an issue with SE5502L-R, 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 SE5502L-R part is unused and in its original packaging.

Return procedure for SE5502L-R:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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