Skyworks Solutions Inc. SKY13380-350LF

Overview

SKY13380-350LF from Skyworks Solutions is a symmetrical single-pole, four-throw (SP4T) RF switch with integrated CMOS decoder, designed for broadband high-power mobile front-end switching. It operates from 20 MHz to 3.0 GHz, delivers 0.40 dB insertion loss at 1 GHz and 28 dB isolation at 1 GHz, and supports 2.5–3.0 V supply for high-power GSM/WCDMA/EDGE handset applications.

For engineers reviewing the SKY13380-350LF datasheet, SKY13380-350LF pinout, SKY13380-350LF application, or SKY13380-350LF equivalent, this device requires attention to its dual-control logic interface, QFN-16 package layout, antenna-to-RF path selection behavior, and absolute maximum RF input power of +40 dBm across its full frequency band.

Technical Context

The SKY13380-350LF integrates a TTL-compatible CMOS decoder with a GaAs pHEMT RF switch core, enabling full SP4T routing using only two logic control lines (CTRL1, CTRL2). Its internal architecture ensures deterministic RF path selection-ANT connects exclusively to one of RF1–RF4 per truth table state-with all other paths maintaining ≥19 dB isolation.

Startup sequencing is critical: VDD must be applied first (25 μs minimum), followed by control signals, then RF input; reverse order required for shutdown. The device remains in undefined high-loss, low-isolation state when VDD is unapplied, making proper power sequencing essential for reliability and linearity.

Key Specifications

Pinout & Package

SKY13380-350LF is housed in a 3 × 3 mm, 16-pin Quad Flat No-Lead (QFN) package rated MSL1 (260 °C reflow compatible), with exposed thermal pad (Pin 16 is N/C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SP4T RF switch applications.

Compared with QM11025 and AFEM-8071, the SKY13380-350LF uniquely balances integrated decoder simplicity, 3 × 3 mm footprint, and verified GSM/WCDMA/EDGE linearity - making it optimal for mid-tier handsets and datacards where BOM count, layout area, and proven 2G/3G performance are prioritized over ultra-wideband or module-level integration.

Availability

SKY13380-350LF is available at Aetrix Electronics and suitable for GSM/WCDMA/EDGE handsets, mobile datacards, and high-power multimode transceiver modules requiring stable component supply, consistent RF performance, and long-term production continuity.

Supply support for SKY13380-350LF 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 infrastructure, mobile communications, and aerospace/defense applications, headquartered in Irvine, CA.

The SKY13380-350LF belongs to Skyworks' high-linearity SPnT RF switch product line, engineered specifically for battery-powered mobile front-ends demanding low insertion loss, high isolation, and robust multi-mode band coverage from 20 MHz to 3.0 GHz.

FAQ

What is the recommended power-up sequence for the SKY13380-350LF?

The SKY13380-350LF requires strict sequencing: apply VDD first (minimum 25 μs startup time), then assert CTRL1 and CTRL2 logic levels, and finally apply RF input. Reversing this order risks device damage or undefined switching states. This sequence ensures the internal pHEMT switch and CMOS decoder stabilize before RF engagement, preserving linearity and preventing latch-up in the SKY13380-350LF.

Does the SKY13380-350LF support 1.8 V logic control when powered at 2.65 V?

Yes - the SKY13380-350LF specifies minimum VHIGH = 1.6 V and maximum VLOW = 0.3 V for CTRL1 and CTRL2, making it fully compatible with 1.8 V GPIOs from baseband processors. At VDD = 2.65 V, the control inputs tolerate 0–3.0 V swing, and leakage remains ≤0.5 μA, ensuring reliable state transitions without level-shifting circuitry in the SKY13380-350LF design.

Can the SKY13380-350LF be used without DC blocking capacitors on RF ports?

No - DC blocking capacitors are mandatory on ANT, RF1, RF2, RF3, and RF4 per datasheet requirements. The SKY13380-350LF has no internal DC path isolation; absence of external blocking capacitors risks DC shorting between ports, unintended biasing of external components (e.g., PAs or LNAs), and violation of absolute maximum ratings. Capacitor values determine low-frequency cutoff and must be selected per target band.

What is the thermal pad connection requirement for the SKY13380-350LF QFN package?

The SKY13380-350LF's exposed thermal pad (center underside of QFN) must be soldered to a solid copper thermal land on the PCB, connected to ground via multiple vias. This is required for both thermal dissipation (critical at +40 dBm input) and RF grounding - incomplete pad connection degrades isolation, increases insertion loss, and risks thermal runaway. The datasheet specifies MSL1 rating and 260 °C reflow compatibility for the SKY13380-350LF.

How does the SKY13380-350LF behave when VDD is unpowered?

When VDD is unapplied, the SKY13380-350LF enters an undefined off-state where all RF paths conduct weakly - acting as a poor four-way power splitter with very low return loss (<10 dB) on all ports. RF input must never be applied in this state, as it risks permanent damage. The SKY13380-350LF datasheet explicitly prohibits RF application without valid VDD, and recommends powering VDD before any RF signal in all operational modes.