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SI4123-D-GT - 1.8 GHz Dual-Band RF Synthesizer | Skyworks Solutions
SI4123-D-GT

SI4123-D-GT - 1.8 GHz Dual-Band RF Synthesizer | Skyworks Solutions

Skyworks Solutions SI4123-D-GT is a dual-band RF frequency-synthesizer IC with integrated VCOs, designed for low-noise IF and dual-band wireless communications. The verified distributor data identifies a 1.8 GHz maximum frequency and a 24-pin TSSOP package measuring 0.173 inches wide by 4.40 mm, while the manufacturer describes the device as targeting price-sensitive, low-power, high-performance personal wireless communications. An RF frequency synthesizer is a phase-locked-loop device that generates stable, programmable RF or IF carrier signals for wireless transmitters, receivers, and related communication equipment. The SI4123-D-GT belongs to the RF synthesizer family and integrates two VCOs, allowing dual-band operation without requiring external VCOs or varactor diodes. Its intended role is local oscillator or carrier generation in systems requiring accurate frequency selection and low-noise RF performance. Verified product information lists a 900 MHz to 1.8 GHz primary frequency range and a 750 MHz to 1.5 GHz secondary range, an output-power range of -14 dBm to +1 dBm, and harmonic levels from -26 dBc to -20 dBc. The specified supply-voltage range is 2.7 V to 3.6 V, with current consumption from 18 mA to 27 mA. These values position the device for compact, low-power wireless products operating near direct-conversion or low-IF architectures. The integrated VCO approach reduces external passive-component count compared with discrete oscillator implementations. It can also simplify RF board layout by eliminating external varactor tuning networks, although loop-filter selection, reference routing, supply decoupling, output matching, and phase-noise requirements remain essential to achieve predictable RF performance. Typical applications include wireless personal communications, dual-band cellular equipment, RF transceivers, IF-generating receiver paths, and compact RF communication modules. The device is most appropriate when the system operates from a 2.7 V to 3.6 V supply and needs programmable synthesis across either of the verified frequency bands. Designers should verify the manufacturer’s reference circuit and pin-specific programming requirements before layout. Keep the reference, synthesizer, and RF output paths short, provide the required bypass capacitors at the supply pins, and preserve controlled impedance routing for high-frequency outputs. Because exact pin names, register behavior, loop-filter values, and absolute phase-noise data were not supplied in the verified data, those details must be confirmed from the manufacturer datasheet. This page consolidates the verified manufacturer description, distributor package information, frequency, power, supply, and current data into an application-oriented engineering summary. It also distinguishes true drop-in alternatives from functional RF substitutes, preventing redesign-level parts from being presented as pin-compatible replacements.

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SI4123-D-GTR - 1.8 GHz Dual-Band RF Synthesizer | Skyworks Solutions (Tape & Reel)
SI4123-D-GTR

SI4123-D-GTR - 1.8 GHz Dual-Band RF Synthesizer | Skyworks Solutions (Tape & Reel)

Skyworks Solutions SI4123-D-GTR is a dual-band RF frequency-synthesizer IC with integrated VCOs, designed for low-noise IF and dual-band wireless communications. The verified distributor data identifies a 1.8 GHz maximum frequency and a 24-pin TSSOP package measuring 0.173 inches wide by 4.40 mm, while the manufacturer describes the device as targeting price-sensitive, low-power, high-performance personal wireless communications. An RF frequency synthesizer is a phase-locked-loop device that generates stable, programmable RF or IF carrier signals for wireless transmitters, receivers, and related communication equipment. The SI4123-D-GTR belongs to the RF synthesizer family and integrates two VCOs, allowing dual-band operation without requiring external VCOs or varactor diodes. Its intended role is local oscillator or carrier generation in systems requiring accurate frequency selection and low-noise RF performance. Verified product information lists a 900 MHz to 1.8 GHz primary frequency range and a 750 MHz to 1.5 GHz secondary range, an output-power range of -14 dBm to +1 dBm, and harmonic levels from -26 dBc to -20 dBc. The specified supply-voltage range is 2.7 V to 3.6 V, with current consumption from 18 mA to 27 mA. These values position the device for compact, low-power wireless products operating near direct-conversion or low-IF architectures. The integrated VCO approach reduces external passive-component count compared with discrete oscillator implementations. It can also simplify RF board layout by eliminating external varactor tuning networks, although loop-filter selection, reference routing, supply decoupling, output matching, and phase-noise requirements remain essential to achieve predictable RF performance. Typical applications include wireless personal communications, dual-band cellular equipment, RF transceivers, IF-generating receiver paths, and compact RF communication modules. The device is most appropriate when the system operates from a 2.7 V to 3.6 V supply and needs programmable synthesis across either of the verified frequency bands. Designers should verify the manufacturer’s reference circuit and pin-specific programming requirements before layout. Keep the reference, synthesizer, and RF output paths short, provide the required bypass capacitors at the supply pins, and preserve controlled impedance routing for high-frequency outputs. Because exact pin names, register behavior, loop-filter values, and absolute phase-noise data were not supplied in the verified data, those details must be confirmed from the manufacturer datasheet. This page consolidates the verified manufacturer description, distributor package information, frequency, power, supply, and current data into an application-oriented engineering summary. It also distinguishes true drop-in alternatives from functional RF substitutes, preventing redesign-level parts from being presented as pin-compatible replacements.

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SI4126-BM - 2.3 GHz WLAN RF/IF Synthesizer | Silicon Labs
SI4126-BM

SI4126-BM - 2.3 GHz WLAN RF/IF Synthesizer | Silicon Labs

The Silicon Labs SI4126-BM is an ISM-band frequency-synthesizer integrated circuit designed for WLAN RF2 and IF synthesis, with a reported maximum operating frequency of 2.3 GHz and a 28-pin MLP package. The supplied source identifies it as an IC synthesizer for WLAN RF2/IF applications, while the family description identifies an RF synthesizer with integrated VCOs for wireless communications. Its role is to generate programmable RF or IF clock signals used by wireless receivers, transmitters, and frequency-conversion stages. A frequency synthesizer is a clock-and-timing IC that derives or generates a stable output frequency from a reference source. The Si4126 family combines RF synthesis functions with integrated voltage-controlled oscillators, loop filtering, reference and VCO dividers, and phase detectors, enabling wireless communication systems to produce accurately programmed local-oscillator signals. Such devices are part of the broader semiconductor hierarchy: RF synthesizer → frequency synthesizer → clock and timing IC → integrated circuit. The SI4126-BM is associated with wireless communications and WLAN RF2/IF use, making programmable frequency generation more important than a fixed clock output. The verified source also describes the family as supporting divider and power-down settings through a three-wire serial interface. This interface allows an embedded controller to configure operating conditions and can simplify integration into systems that require multiple RF or IF frequencies. The available data does not provide complete electrical ratings, tuning range, phase-noise values, temperature limits, or control-voltage levels. Typical implementation uses the synthesizer as the local oscillator for RF upconversion, RF downconversion, or IF signal generation. The generated signal supports channel selection in WLAN equipment and other wireless communication systems. Compared with a fixed-frequency oscillator, a programmable synthesizer permits different operating channels to be selected by changing divider, divider, or frequency-control settings through the serial interface, subject to the detailed register and electrical requirements in the manufacturer documentation. Engineers should preserve the manufacturer’s recommended reference, loop-filter, grounding, decoupling, and RF-routing layout. The 28-pin surface-mount package requires careful thermal and electrical implementation, particularly when the synthesizer drives downstream mixers or converters. Before layout release, obtain the complete manufacturer datasheet and verify the exact Si4126-BM variant, package drawing, exposed-pad requirements, reference frequency, operating modes, and production lifecycle status. This page consolidates the verified distributor descriptions, package information, and source links for SI4126-BM and distinguishes confirmed facts from parameters that remain unavailable in the supplied data. It is intended to support initial sourcing and engineering review, not to replace manufacturer validation.

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SI4126-F-GM - 2.3 GHz RF Synthesizer | Skyworks
SI4126-F-GM

SI4126-F-GM - 2.3 GHz RF Synthesizer | Skyworks

The Skyworks Solutions SI4126-F-GM is an ISM-band RF frequency-synthesizer integrated circuit with a 2.3 GHz RF output, one synthesizer channel, a 2 MHz to 50 MHz input range, and a 28-pin VQFN exposed-pad package. Its integrated VCO, loop filter, varactors, and resonators minimize external component requirements for wireless-communication designs. A frequency synthesizer is a clock-and-timing building block that uses a phase-locked loop to create stable, programmable radio-frequency output signals. The broader hierarchy is RF synthesizer → frequency synthesizer → PLL/clock-generation IC → timing and RF integrated circuit. By generating an RF carrier or intermediate-frequency signal, this class of device supports wireless transmitters, receivers, modems, and ISM-band radio equipment. The verified distributor data identifies a maximum RF output of 2.3 GHz, one output channel, a 2 MHz to 50 MHz input range, and a 28-pin QFN exposed-pad package. Additional manufacturer descriptions state that the SI4126 family integrates VCOs, loop filters, varactors, and resonators, requires minimal external components, provides low phase noise, draws 5 uA in standby, and typically consumes 25.7 mA from the supply. These characteristics can shorten RF board development by reducing discrete resonator and varactor assembly. The device is intended for wireless communications in the industrial, scientific, and medical radio bands. A system designer can use its programmable synthesis function to establish an RF carrier for a transceiver chain, subject to the frequency plan, loop settings, reference requirements, and regulatory limits defined in the manufacturer datasheet. Its integrated frequency-setting elements also simplify BOM management compared with a discrete VCO implementation, although fixed external filtering, matching, and regulatory testing remain necessary. PCB layout is a central design consideration because a phase-locked-loop synthesizer contains a high-frequency oscillator and sensitive feedback node. The exposed pad must be connected to the required ground plane, supply and return paths must be short, and RF output routing should use controlled-impedance geometry where applicable. The datasheet must be consulted for the complete recommended decoupling network, loop-filter values, reference sensitivity, package land pattern, exposed-pad connection, and operating limits. This page consolidates the verified distributor descriptions, package information, sourcing links, and practical RF layout considerations. It intentionally avoids inventing missing electrical limits, pricing, pin names, or alternative parts; those details remain marked as data needed until confirmed from the manufacturer datasheet or a verified cross-reference. The SI4126-F-GM is best evaluated when a wireless design benefits from a highly integrated ISM RF synthesizer and a compact exposed-pad package. Final design release requires reviewing the manufacturer datasheet for absolute maximum ratings, tuning range, lock-time behavior, phase-noise profile, control interfaces, recommended PCB land pattern, and regulatory implementation constraints.

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SI4126-F-GMR - 2.3 GHz RF Synthesizer | Skyworks (Tape & Reel)
SI4126-F-GMR

SI4126-F-GMR - 2.3 GHz RF Synthesizer | Skyworks (Tape & Reel)

The Skyworks Solutions SI4126-F-GMR is an ISM-band RF frequency-synthesizer integrated circuit with a 2.3 GHz RF output, one synthesizer channel, a 2 MHz to 50 MHz input range, and a 28-pin VQFN exposed-pad package. Its integrated VCO, loop filter, varactors, and resonators minimize external component requirements for wireless-communication designs. A frequency synthesizer is a clock-and-timing building block that uses a phase-locked loop to create stable, programmable radio-frequency output signals. The broader hierarchy is RF synthesizer → frequency synthesizer → PLL/clock-generation IC → timing and RF integrated circuit. By generating an RF carrier or intermediate-frequency signal, this class of device supports wireless transmitters, receivers, modems, and ISM-band radio equipment. The verified distributor data identifies a maximum RF output of 2.3 GHz, one output channel, a 2 MHz to 50 MHz input range, and a 28-pin QFN exposed-pad package. Additional manufacturer descriptions state that the SI4126 family integrates VCOs, loop filters, varactors, and resonators, requires minimal external components, provides low phase noise, draws 5 uA in standby, and typically consumes 25.7 mA from the supply. These characteristics can shorten RF board development by reducing discrete resonator and varactor assembly. The device is intended for wireless communications in the industrial, scientific, and medical radio bands. A system designer can use its programmable synthesis function to establish an RF carrier for a transceiver chain, subject to the frequency plan, loop settings, reference requirements, and regulatory limits defined in the manufacturer datasheet. Its integrated frequency-setting elements also simplify BOM management compared with a discrete VCO implementation, although fixed external filtering, matching, and regulatory testing remain necessary. PCB layout is a central design consideration because a phase-locked-loop synthesizer contains a high-frequency oscillator and sensitive feedback node. The exposed pad must be connected to the required ground plane, supply and return paths must be short, and RF output routing should use controlled-impedance geometry where applicable. The datasheet must be consulted for the complete recommended decoupling network, loop-filter values, reference sensitivity, package land pattern, exposed-pad connection, and operating limits. This page consolidates the verified distributor descriptions, package information, sourcing links, and practical RF layout considerations. It intentionally avoids inventing missing electrical limits, pricing, pin names, or alternative parts; those details remain marked as data needed until confirmed from the manufacturer datasheet or a verified cross-reference. The SI4126-F-GMR is best evaluated when a wireless design benefits from a highly integrated ISM RF synthesizer and a compact exposed-pad package. Final design release requires reviewing the manufacturer datasheet for absolute maximum ratings, tuning range, lock-time behavior, phase-noise profile, control interfaces, recommended PCB land pattern, and regulatory implementation constraints.

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SI4133-BT - 1.8 GHz Dual-Band RF Synthesizer | Silicon Labs
SI4133-BT

SI4133-BT - 1.8 GHz Dual-Band RF Synthesizer | Silicon Labs

The Silicon Labs SI4133-BT is a frequency-synthesizer IC for wireless communications that operates up to 1.8 GHz from a 2.7 V to 3.6 V supply in a 24-pin TSSOP package. It integrates three VCOs, loop filters, reference and VCO dividers, and phase detectors, while the verified sources identify a dual-band RF synthesis role and an external tank-inductance requirement. Typical supply current is 18 mA, and standby current is 1 uA. A frequency synthesizer is a clock-and-timing or RF integrated circuit that locks an output oscillator to a stable reference frequency. By dividing the reference, comparing phases, and driving a voltage-controlled oscillator through an integrated loop filter, the SI4133 generates programmable wireless-communications carrier frequencies. This synthesis function places it within the hierarchy PLL frequency synthesizer, clock and timing IC, RF signal generator, and semiconductor. The SI4133-BT requires only two external components according to the verified datasheet excerpt because its VCOs, loop filters, varactors, and resonators are integrated. It offers low phase noise, programmable power-down modes, and a self-tuning algorithm that compensates for tank-inductance variation after startup or a programmed frequency change. Those features simplify RF design while preserving the sensitivity expected in wireless links. Silicon Labs specifies that package inductance must be considered because total VCO tank inductance is in the low-nanohenry range. The 24-TSSOP outline is only 0.173 inch, or 4.40 mm, wide, and surface mounting makes it practical for compact radio designs. The verified operating-temperature listing spans -40 C to +85 C, while the provided evidence does not establish the complete set of frequency bands for this exact orderable MPN. Typical uses include RF local-oscillator generation, dual-band wireless receivers and transmitters, intermediate-frequency synthesis, and compact RF communications modules. In these systems, the synthesizer converts a reference oscillator into a programmable RF carrier used by mixers, modulators, or demodulators. Low phase noise supports signal integrity, while power-down current helps preserve battery life between active periods. The primary design consideration is reference and power-layout discipline. Keep the reference path short, use recommended decoupling at the supply pins, and follow the manufacturer's external-inductor and grounding guidance. PCB parasitics can alter the low-inductance VCO tank, so placement and trace geometry should be treated as part of the RF network rather than as purely electrical interconnect. This page consolidates the verified distributor specifications, a manufacturer-hosted datasheet link, family architecture, and engineering-focused usage guidance. Pricing remains quote-dependent because the supplied web results advertise live distributor purchasing without numeric prices, and it does not present five verified drop-in replacements.

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SI4133-D-GM - Triple-VCO 1.72GHz RF Synthesizer | Silicon Labs
SI4133-D-GM

SI4133-D-GM - Triple-VCO 1.72GHz RF Synthesizer | Silicon Labs

The Silicon Laboratories SI4133-D-GM is a triple-VCO RF frequency synthesizer IC with IF and dual-band synthesis, a 2 MHz to 26 MHz input range, and operation up to 1.72 GHz in a 28-pin QFN exposed-pad package. It integrates three VCOs, loop filters, reference and VCO dividers, and phase detectors to reduce external RF components. An RF frequency synthesizer is a phase-locked-loop timing and RF component that generates a programmable output from a stable reference. The Si4133 combines IF synthesis with dual-band RF synthesis, placing it in the RF synthesizer, PLL, clock-generation, and wireless-communications equipment hierarchy. Its integrated VCOs eliminate separate external VCO and varactor assemblies in suitable designs. The device supports three synthesizer circuits, programmable power-down modes, low phase noise, and a 1 uA standby current. According to the manufacturer product information, it targets price-sensitive, low-power, high-performance personal wireless communications while reducing passive-component count and improving power efficiency. LCSC lists a starting price of $3.3339 as of 2026-10-22. The listed operating supply range is 2.7 V to 3.6 V. The manufacturer describes low-noise IF and dual-band RF synthesis, while distributor data identifies the output capability as up to 1.72 GHz. The exposed pad supports heat transfer to the PCB, but loop-filter values, VCO tuning range details, phase-noise plots, and complete timing specifications must be taken from the manufacturer datasheet rather than inferred from distributor summaries. Typical uses include wireless personal-communications equipment, IF/RF up-conversion systems, dual-band transmitters, low-power radio designs, and compact RF modules. System designers should preserve clean reference routing, provide compliant loop filtering, decouple the supply, and connect the exposed pad to the recommended thermal and ground-plane layout. A design tradeoff is integration versus program flexibility: integrating three VCOs, dividers, filters, and detectors simplifies RF assembly, but the planner must still account for lock-time, spur, tuning-range, reference-noise, and thermal requirements for the intended band. Verify all band-specific constraints against the official datasheet. This page consolidates manufacturer and distributor information, verified source links, application guidance, and replacement screening into an engineering-focused summary. Because the supplied data does not establish several detailed electrical limits or lifecycle classifications, those fields remain explicitly marked rather than guessed.

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SI4133-D-GMR - Triple-VCO 1.72GHz RF Synthesizer | Silicon Labs (Tape & Reel)
SI4133-D-GMR

SI4133-D-GMR - Triple-VCO 1.72GHz RF Synthesizer | Silicon Labs (Tape & Reel)

The Silicon Laboratories SI4133-D-GMR is a triple-VCO RF frequency synthesizer IC with IF and dual-band synthesis, a 2 MHz to 26 MHz input range, and operation up to 1.72 GHz in a 28-pin QFN exposed-pad package. It integrates three VCOs, loop filters, reference and VCO dividers, and phase detectors to reduce external RF components. An RF frequency synthesizer is a phase-locked-loop timing and RF component that generates a programmable output from a stable reference. The Si4133 combines IF synthesis with dual-band RF synthesis, placing it in the RF synthesizer, PLL, clock-generation, and wireless-communications equipment hierarchy. Its integrated VCOs eliminate separate external VCO and varactor assemblies in suitable designs. The device supports three synthesizer circuits, programmable power-down modes, low phase noise, and a 1 uA standby current. According to the manufacturer product information, it targets price-sensitive, low-power, high-performance personal wireless communications while reducing passive-component count and improving power efficiency. LCSC lists a starting price of $3.3339 as of 2026-10-22. The listed operating supply range is 2.7 V to 3.6 V. The manufacturer describes low-noise IF and dual-band RF synthesis, while distributor data identifies the output capability as up to 1.72 GHz. The exposed pad supports heat transfer to the PCB, but loop-filter values, VCO tuning range details, phase-noise plots, and complete timing specifications must be taken from the manufacturer datasheet rather than inferred from distributor summaries. Typical uses include wireless personal-communications equipment, IF/RF up-conversion systems, dual-band transmitters, low-power radio designs, and compact RF modules. System designers should preserve clean reference routing, provide compliant loop filtering, decouple the supply, and connect the exposed pad to the recommended thermal and ground-plane layout. A design tradeoff is integration versus program flexibility: integrating three VCOs, dividers, filters, and detectors simplifies RF assembly, but the planner must still account for lock-time, spur, tuning-range, reference-noise, and thermal requirements for the intended band. Verify all band-specific constraints against the official datasheet. This page consolidates manufacturer and distributor information, verified source links, application guidance, and replacement screening into an engineering-focused summary. Because the supplied data does not establish several detailed electrical limits or lifecycle classifications, those fields remain explicitly marked rather than guessed.

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SI4133-D-GT - 1.8 GHz Dual-Band RF Synthesizer | Skyworks
SI4133-D-GT

SI4133-D-GT - 1.8 GHz Dual-Band RF Synthesizer | Skyworks

Skyworks Solutions Inc. SI4133-D-GT is a monolithic dual-band RF frequency-synthesizer IC with a maximum stated synthesizer frequency of 1.8 GHz, three integrated VCOs, loop filters, reference and VCO dividers, and phase detectors. It is packaged in a 24-pin TSSOP measuring 4.40 mm wide and is supplied in a surface-mount tape-and-reel configuration identified by the GT suffix. The device performs IF and dual-band RF synthesis for wireless communications applications. A frequency synthesizer is a phase-locked-loop component that combines a voltage-controlled oscillator with a phase detector, loop filter, dividers, and reference path to generate stable programmable frequencies. In the broader semiconductor hierarchy, the SI4133 is an RF synthesizer, a phase-locked-loop device, a clock-and-timing IC, and an integrated transceiver support component. Its integrated VCO architecture is intended to reduce external passive count and eliminate separate external VCOs and varactor diodes. The SI4133 includes three VCOs supporting RF1, RF2, and IF synthesis. Verified distributor information identifies it as a frequency-synthesizer IC with one RF1/RF2/IF output function and a 1.8 GHz headline frequency. A separate source excerpt gives a maximum input frequency of 26 MHz, a 2.7 V to 3.6 V supply range, three circuits, low phase noise, programmable power-down, and 1 µA standby current; these values should be confirmed against the manufacturer datasheet before design release. RF integration simplifies wireless RF front-end design by placing the synthesizer functions on one monolithic device. The internal dividers and phase detectors support programmable dual-band RF generation, while the loop filters regulate feedback around each VCO. Compared with a discrete synthesizer implementation, this integrated approach can reduce board area and external RF components, but loop-filter values, reference quality, output power, spur behavior, and supply decoupling remain critical system-level considerations. Typical uses include wireless personal communications, dual-band radio equipment, IF synthesis, RF transceiver local-oscillator generation, and other frequency-generation systems operating within the device's specified limits. The TSSOP-24 package supports conventional PCB assembly, but RF trace routing, controlled ground return paths, and compact decoupling layouts remain important because supply and reference disturbances can affect phase noise and spur performance. The most important design step is to follow the manufacturer reference design for pin termination, ground connection, loop-filter implementation, reference input conditioning, and RF output matching. Do not infer unreported package pin functions from distributor summaries. Verify the complete SI4133 pinout, recommended decoupling, operating temperature, RF output specifications, and register/programming requirements against the manufacturer datasheet before PCB release. This page combines verified distributor identification, the official manufacturer overview, and clearly marked data gaps. It also distinguishes genuinely supported drop-in evidence from unreleased packaging or terminal-style variants, helping engineers avoid treating a similar RF synthesizer as a PCB-compatible replacement without footprint and function verification.

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SI4133-D-GTR - 1.8 GHz Dual-Band RF Synthesizer | Skyworks (Tape & Reel)
SI4133-D-GTR

SI4133-D-GTR - 1.8 GHz Dual-Band RF Synthesizer | Skyworks (Tape & Reel)

Skyworks Solutions Inc. SI4133-D-GTR is a monolithic dual-band RF frequency-synthesizer IC with a maximum stated synthesizer frequency of 1.8 GHz, three integrated VCOs, loop filters, reference and VCO dividers, and phase detectors. It is packaged in a 24-pin TSSOP measuring 4.40 mm wide and is supplied in a surface-mount tape-and-reel configuration identified by the GT suffix. The device performs IF and dual-band RF synthesis for wireless communications applications. A frequency synthesizer is a phase-locked-loop component that combines a voltage-controlled oscillator with a phase detector, loop filter, dividers, and reference path to generate stable programmable frequencies. In the broader semiconductor hierarchy, the SI4133 is an RF synthesizer, a phase-locked-loop device, a clock-and-timing IC, and an integrated transceiver support component. Its integrated VCO architecture is intended to reduce external passive count and eliminate separate external VCOs and varactor diodes. The SI4133 includes three VCOs supporting RF1, RF2, and IF synthesis. Verified distributor information identifies it as a frequency-synthesizer IC with one RF1/RF2/IF output function and a 1.8 GHz headline frequency. A separate source excerpt gives a maximum input frequency of 26 MHz, a 2.7 V to 3.6 V supply range, three circuits, low phase noise, programmable power-down, and 1 µA standby current; these values should be confirmed against the manufacturer datasheet before design release. RF integration simplifies wireless RF front-end design by placing the synthesizer functions on one monolithic device. The internal dividers and phase detectors support programmable dual-band RF generation, while the loop filters regulate feedback around each VCO. Compared with a discrete synthesizer implementation, this integrated approach can reduce board area and external RF components, but loop-filter values, reference quality, output power, spur behavior, and supply decoupling remain critical system-level considerations. Typical uses include wireless personal communications, dual-band radio equipment, IF synthesis, RF transceiver local-oscillator generation, and other frequency-generation systems operating within the device's specified limits. The TSSOP-24 package supports conventional PCB assembly, but RF trace routing, controlled ground return paths, and compact decoupling layouts remain important because supply and reference disturbances can affect phase noise and spur performance. The most important design step is to follow the manufacturer reference design for pin termination, ground connection, loop-filter implementation, reference input conditioning, and RF output matching. Do not infer unreported package pin functions from distributor summaries. Verify the complete SI4133 pinout, recommended decoupling, operating temperature, RF output specifications, and register/programming requirements against the manufacturer datasheet before PCB release. This page combines verified distributor identification, the official manufacturer overview, and clearly marked data gaps. It also distinguishes genuinely supported drop-in evidence from unreleased packaging or terminal-style variants, helping engineers avoid treating a similar RF synthesizer as a PCB-compatible replacement without footprint and function verification.

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SI4133GX2-BM - 1.8 GHz Frequency Synthesizer | Silicon Labs
SI4133GX2-BM

SI4133GX2-BM - 1.8 GHz Frequency Synthesizer | Silicon Labs

Silicon Labs SI4133GX2-BM is a 1.8 GHz frequency-synthesizer IC with three complete phase-locked loops, integrated voltage-controlled oscillators, phase detectors, loop filters, and reference dividers. It operates from a 2.7 V to 3.6 V supply and is packaged in a 28-VFQFN exposed-pad package. The device is programmed through a three-wire serial interface and includes an IF channel alongside the two RF synthesis channels. A frequency synthesizer is a clock-and-timing IC that generates or converts an output frequency from a stable reference through a phase-locked loop. The SI4133G family belongs to the PLL synthesizer hierarchy, combining a phase detector, loop filter, voltage-controlled oscillator, and programmable divider in one integrated implementation. This integration reduces external components and provides a compact frequency-generation solution for RF and communications equipment. The SI4133GX2-BM supports frequencies up to 1.8 GHz and a documented input-to-output ratio beginning at 1:2. Its integrated VCOs provide low phase noise for demanding wireless-communications applications. Three independently configurable PLL channels allow a single IC to serve multiple conversion paths, which can simplify radio architectures compared with separate discrete synthesizers. The 2.7 V to 3.6 V operating supply supports integration into low-voltage RF, intermediate-frequency, and digital signal-chain equipment. The package is a 5 mm by 5 mm 28-VFQFN with an exposed thermal pad. The exposed pad provides a low-resistance thermal path from the IC to the PCB and should be connected to the appropriate ground plane according to the manufacturer's land pattern. Because this package has fine-pitch leads, assembly processes must use the specified footprint and thermal-via arrangement. Reliable RF performance also depends on short return paths, controlled reference routing, and separation between sensitive synthesizer nodes and high-energy clock or switching circuitry. Typical uses include wireless receiver and transmitter local oscillators, intermediate-frequency generation, clock multiplication, and multi-channel RF signal conversion. The three-PLL architecture is useful when related reference, RF, and IF frequencies must share one IC. System designers should evaluate divider ratios, reference-jitter sensitivity, loop-filter settings, output-buffer loading, and channel-to-channel isolation before finalizing frequency plans. The main design trade-off is integration against programming and layout complexity. Three on-chip PLLs reduce external component count, but each output still requires careful frequency planning and verification. The 28-VFQFN footprint also demands solderable thermal vias or an equivalent heat-spreading arrangement; removing the exposed pad or using an incorrect footprint can impair both assembly yield and thermal performance. This product page consolidates the verified distributor listings, package information, supply range, synthesizer features, and engineering guidance for SI4133GX2-BM. It also distinguishes documented parameters from missing pricing, compliance, and exact-pin data, while identifying the lack of independently verified, same-package drop-in substitutes.

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SI4133T-BM - 1.8 GHz Frequency Synthesizer | Silicon Labs
SI4133T-BM

SI4133T-BM - 1.8 GHz Frequency Synthesizer | Silicon Labs

The Silicon Labs SI4133T-BM is a 1.8 GHz frequency synthesizer IC with a 2.7 V to 3 V supply range, a 1:2 input-to-output ratio, and a 28-VFQFN exposed-pad package measuring 5 mm by 5 mm. It belongs to the Aero series and is intended for compact systems requiring an integrated phase-locked-loop frequency synthesizer rather than a collection of discrete timing and synthesis components. The verified distributor listings identify the SI4133T-BM as a single-circuit RF frequency-synthesizer device with an exposed thermal pad. A frequency synthesizer is a timing and control IC that generates an output frequency from a stable reference. Within the broader semiconductor hierarchy, the SI4133T-BM is a PLL-based clock generator and frequency synthesizer, belonging to the clock and timing IC family used in RF, communications, test equipment, and digital systems. An integrated PLL and voltage-controlled oscillator can simplify frequency planning while reducing the component count required by a discrete reference, divider, loop filter, and oscillator arrangement. The verified feature set identifies a maximum frequency of 1.8 GHz, a 2.7 V to 3 V operating supply, and an input-to-output ratio of 1:2. These parameters place the device in applications where a relatively high-frequency synthesized reference is needed without the higher supply voltage associated with many larger RF synthesizer families. The 28-VFQFN package also supports compact RF board layouts, although its exposed pad requires deliberate thermal and layout treatment. The SI4133T-BM integrates the core frequency-synthesis function into one package. Its 1:2 ratio identifies a divided synthesis architecture, but the supplied source material does not expose the complete divider table, reference-frequency range, phase-noise values, lock-time data, or channel spacing. Those details must therefore be confirmed in the manufacturer datasheet before finalizing a PLL loop filter, reference selection, or production release. Typical uses include RF transceiver clocking, local-oscillator generation, communications test equipment, wireless infrastructure, and embedded frequency-reference subsystems. In these systems, the 1.8 GHz ceiling provides a defined operating envelope, while the low 2.7 V to 3 V supply can simplify integration with adjacent digital or RF circuitry. The 1:2 ratio is especially relevant when the downstream block requires a related clock or intermediate frequency. Designers should place input, output, supply, and ground connections according to the manufacturer’s reference layout, with a continuous ground plane beneath the exposed pad. Because loop bandwidth depends on phase noise, reference quality, divider settings, and filtering, the available 1.8 GHz, 1:2, and 2.7 V to 3 V specifications are not sufficient to select final capacitors or predict lock performance. This page consolidates verified distributor attributes, pricing status, package details, and practical substitution constraints. It also distinguishes a documented same-package candidate from package-only order codes and unrelated devices, helping engineers compare alternatives without mistaking a different footprint for a true PCB drop-in replacement.

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SI4133T-GM - 1.8GHz Frequency Synthesizer | Silicon Labs
SI4133T-GM

SI4133T-GM - 1.8GHz Frequency Synthesizer | Silicon Labs

The Silicon Labs SI4133T-GM is a single-circuit frequency synthesizer IC with an operating frequency specified up to 1.8 GHz, supplied in a 28-pin VFQFN exposed-pad package measuring 5 mm by 5 mm. The verified distributor data identifies the device as a clock generator, PLL, and frequency-synthesizer component with a 2.7 V to 3 V supply-voltage range. These headline characteristics place the part in the clock-and-timing IC hierarchy, where it can generate or distribute a controlled frequency for dependent digital, communication, or test circuitry. A frequency synthesizer is a clock-and-timing IC that derives one or more stable output frequencies from a controlled internal reference and phase-locked loop. Compared with a fixed-frequency oscillator, a synthesizer allows the operating frequency to be programmed over a defined range. Compared with a general-purpose clock generator, the SI4133T-GM is specifically categorized as a frequency synthesizer IC. Its exact architecture, reference frequency, output configuration, tuning range, phase-noise characteristics, and programming interface remain unavailable in the supplied source data. The SI4133T-GM supports a 2.7 V to 3 V supply range and is specified for operation up to 1.8 GHz. The verified sources list one frequency-synthesizer circuit in the package. Its 28-VFQFN exposed-pad construction provides 28 package pins and an exposed thermal pad for heat transfer into the PCB. The exposed pad also requires careful land-pattern and assembly design so that thermal and electrical performance is not degraded by an inadequate ground or thermal connection. A key engineering consideration is that the 2.7 V to 3 V operating range leaves less supply-voltage margin than many mixed-signal or legacy clock systems. A design should therefore verify that every associated digital interface, reference supply, and downstream load remains compatible with this range. The supplied evidence does not specify input or output logic thresholds, decoupling requirements, reference sensitivity, PLL loop bandwidth, lock time, or output drive capability; those values must be confirmed in the manufacturer datasheet before schematic release. Typical design roles include local clock generation, PLL-based frequency translation, communication-module clocking, test-and-measurement clock distribution, and digital-system reference generation. In each case, the device's stated 1.8 GHz upper frequency and integrated frequency-synthesizer function make it a candidate, but selection requires confirmation of the required output count, frequency range, reference input, modulation requirements, and channel-to-channel isolation. Those application-specific parameters are not contained in the verified snippets provided for this MPN. Designers should use the manufacturer's complete pinout and recommended land pattern rather than infer connections from the 28-pin package count. Input and output routing should be short, the exposed pad should have a full thermal-via array where recommended, and all supply bypass capacitors should be placed close to their associated pins. Because detailed decoupling values and pin functions are absent from the supplied evidence, their selection must remain open until the official datasheet is reviewed. This product record consolidates the verified 1.8 GHz frequency-synthesizer classification, 2.7 V to 3 V supply range, single-circuit configuration, and 28-VFQFN exposed-pad package into a concise engineering reference. It also distinguishes the confirmed SI4133T-BM comparison part from unverified replacement candidates, identifies every unavailable technical parameter explicitly, and avoids treating general cross-reference tools as proof of pin-compatible equivalence.

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SI4134T-BM - 1.99 GHz PLL Frequency Synthesizer | Silicon Labs
SI4134T-BM

SI4134T-BM - 1.99 GHz PLL Frequency Synthesizer | Silicon Labs

The Silicon Labs SI4134T-BM is a frequency synthesizer integrated circuit with PLL architecture, clock input, clock output, and a maximum operating frequency of 1.99 GHz. It operates from a 2.7 V to 3 V supply in a 32-VFQFN exposed-pad package, providing a compact solution for clock generation and frequency multiplication in communications, test, and instrumentation systems. The device is identified as a single-circuit frequency synthesizer with a 1:2 input-to-output ratio. A frequency synthesizer is a clock-and-timing IC that uses a phase-locked loop to generate, divide, or multiply a reference frequency into a stable output clock. Within the broader semiconductor hierarchy, it belongs to the clock generator and PLL family, operating as a timing-management IC within communications and electronic-control systems. Its internal PLL enables frequency generation from a stable reference source, making it useful where a system requires precise, repeatable clocking rather than a free-running oscillator alone. Key verified features include a maximum frequency of 1.99 GHz, a 2.7 V to 3 V operating supply range, a clock input, a clock output, PLL operation, a 1:2 input-to-output ratio, and a differential output arrangement identified as No input and Yes output in the supplied distributor data. The 32-VFQFN exposed-pad package is designed for surface-mount assembly and supports compact implementation in RF and baseband circuits. The listed operating-temperature range is -20 °C to +85 °C. The SI4134T-BM is intended for RF and baseband circuit applications, data converters, transceivers, and other high-speed systems that require synthesized clocks. Its relatively low 2.7 V to 3 V supply range makes it suitable for systems built around low-voltage RF and mixed-signal architectures. The 1:2 ratio provides a straightforward multiplication function when the system reference is arranged for that relationship. When designing around this part, verify the complete pinout, reference-clock requirements, loop-filter component values, output-routing options, and exposed-pad land pattern against the manufacturer datasheet. Because the supplied web data does not include the full pin assignments, reference frequency range, output drive, phase-noise limits, or recommended decoupling details, those values remain marked as data-needed rather than inferred. The exposed pad should be connected according to the manufacturer’s thermal and layout guidance.

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SI4134T-GM - 1.99 GHz Dual Frequency Synthesizer | Silicon Labs
SI4134T-GM

SI4134T-GM - 1.99 GHz Dual Frequency Synthesizer | Silicon Labs

Silicon Labs SI4134T-GM is a dual-output frequency synthesizer IC with a maximum frequency of 1.99 GHz, a 2.7 V to 3 V supply range, and a 32-VFQFN exposed-pad package measuring 5 mm by 5 mm. It combines a dual synthesizer with a DCXO function in the AERO+ series, making it suitable for clock generation and PLL-based frequency multiplication in communication, test, and measurement equipment. A frequency synthesizer is a clock-and-timing IC that derives one or more stable output frequencies from a reference source. Its product hierarchy is frequency synthesizer → PLL synthesizer → clock generator → clock and timing IC → semiconductor. Unlike a simple crystal oscillator, an active frequency synthesizer supports programmable multiplication, phase adjustment, and integrated clock-generation functions within one package. The verified manufacturer and distributor data identify a maximum operating frequency of 1.99 GHz, a dual configuration, an input-to-output ratio of 1:2, and an integrated DCXO. These features make the SI4134T-GM useful where a system requires controlled high-frequency clocks derived from a lower-frequency reference. The exact divider settings, phase-noise values, temperature range, and output specifications are not present in the supplied verified data and therefore require confirmation from the manufacturer datasheet. The device operates from a 2.7 V to 3 V supply, placing it in the low-voltage domain of programmable logic and communication equipment. A dedicated analog supply arrangement is characteristic of clock-generator designs, but the supplied search results do not identify individual supply pins or recommended capacitor values. Those details should be taken directly from the SI4134 datasheet before schematic capture. Typical uses include RF and baseband transceiver clocking, data-converter clock generation, wireless communication modules, instrumentation, and test equipment. In these systems, the SI4134T-GM can provide multiple related clock outputs from a common reference while reducing the number of separate oscillators required. Its 1.99 GHz ceiling provides headroom for high-speed digital and RF signal chains. When designing a replacement board, preserve the 32-VFQFN exposed-pad land pattern and verify pin-to-pin assignments, supply sequencing, reference amplitude, loop-filter components, and output termination. A 5 mm by 5 mm package supports compact placement, but its exposed pad requires careful thermal and layout design. The supplied evidence identifies SI4134T-BM as a closely related same-package family member, while the verified SI4134T-BM cross-reference does not establish its complete electrical equivalence. This page consolidates verified distributor specifications, source links, same-family cross-reference information, and practical integration guidance. It separates confirmed facts from unavailable parameters, helping engineers evaluate the SI4134T-GM for clock-generation designs without treating unverified electrical details as guaranteed specifications.

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SI4136-BM - 2.5 GHz RF Synthesizer | Silicon Labs | Wireless
SI4136-BM

SI4136-BM - 2.5 GHz RF Synthesizer | Silicon Labs | Wireless

Silicon Labs SI4136-BM is an integrated RF frequency synthesizer IC with a maximum operating frequency of 2.5 GHz, a 2.7 V to 3.6 V supply range, and a 28-VFQFN exposed-pad surface-mount package. Designed for wireless communications, the device combines three VCOs, loop filters, reference and VCO dividers, and phase detectors in one monolithic component. Its programmable divider and powerdown settings are controlled through a three-wire serial interface, reducing external RF infrastructure while supporting IF and RF synthesis. A frequency synthesizer is a clock-and-timing device that generates, multiplies, divides, and locks a reference signal to a selected output frequency. The SI4136 belongs to the PLL frequency-synthesizer and RF-synthesizer hierarchy, where a phase-locked loop steers an oscillator to maintain a controlled relationship between a stable reference and an RF output. This makes the device relevant to wireless transceivers, RF modems, frequency-agile communications equipment, and embedded RF systems rather than ordinary low-frequency clock distribution. The SI4136-BM combines three integrated VCOs with programmable dividers and phase detectors. This architecture allows the synthesizer to cover multiple RF conversion paths while centralizing frequency planning in a serial-programmable device. The verified component data identifies PLL operation, crystal input, clock output, one circuit, and support for divider and multiplier functions. The three-wire serial programming interface is important because it reduces the number of discrete control connections required by the system. The SI4136-BM is specified for a maximum frequency of 2.5 GHz and an operating supply range of 2.7 V to 3.6 V, making it suitable for compact RF systems whose supply architecture is already designed around low-voltage semiconductor rails. Its exposed pad provides a thermal and electrical connection to the PCB, but the required thermal-management details and exact pad-layout guidance must be taken from the manufacturer datasheet before layout release. The 28-VFQFN footprint is a surface-mount package intended for manufacturing reflow and automated assembly. Typical applications include wireless communication modules, RF front-end supporting ICs, IF/RF conversion chains, and industrial or consumer products requiring programmable frequency generation. In these systems, the synthesizer establishes a stable RF or intermediate-frequency reference while the surrounding transceiver handles signal mixing, modulation, filtering, and power amplification. Integration can reduce board area and assembly complexity, although system designers must still verify reference-noise requirements, loop-filter settings, startup behavior, and regulatory output requirements. Designers should preserve the exposed-pad copper connection, place supporting components according to the manufacturer’s reference layout, and keep sensitive RF and reference traces away from noisy switching nodes. Because the verified data does not provide the complete pin-level electrical table, pin names, oscillator tuning range, reference frequency, divider ratios, output characteristics, or recommended loop-filter values, those parameters require confirmation in the official datasheet. This page combines the verified product identity, package, supply, frequency, and sourcing information with practical design guidance without filling unavailable values with assumptions. This product-data summary distinguishes SI4136-BM from ordinary fixed-frequency oscillators by emphasizing its integrated VCOs, dividers, phase detectors, loop filters, and serial programming. For procurement, verify current manufacturer identity and lifecycle status with an authorized distributor because search results reference both Silicon Labs and Skyworks Solutions, and confirm the exact package, temperature range, and electrical configuration against the latest manufacturer documentation.

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SI4136-BT - 2.5GHz RF Synthesizer with Integrated VCOs
SI4136-BT

SI4136-BT - 2.5GHz RF Synthesizer with Integrated VCOs

Silicon Labs SI4136-BT is an ISM RF frequency synthesizer IC with a maximum operating frequency of 2.5 GHz, three integrated VCOs, and a 24-pin TSSOP package. The device performs RF and IF synthesis for wireless communications and supports programmable divider and power-down settings through a three-wire serial interface. Its verified features include low phase noise, minimal external-component requirements, 5 uA standby current, and 25.7 mA typical supply current. A frequency synthesizer is a Clock & Timing IC that generates one or more stable, programmable output frequencies from a reference clock. An RF synthesizer combines a voltage-controlled oscillator, frequency dividers, phase detectors, loop filters, and control logic to support wireless transmitters and receivers. The SI4136 belongs to the broader clock-generation and timing hierarchy, where accurate frequency generation is essential for RF modulation, demodulation, channel selection, and local-oscillator requirements. The SI4136-BT integrates three VCOs, loop filters, varactors, resonators, reference and VCO dividers, and phase detectors. This integration reduces the external circuitry needed for an RF synthesis solution. Its 2.5 GHz maximum operating frequency makes it suitable for ISM wireless communication equipment operating within the supported RF range. The 24-TSSOP package is identified as approximately 4.40 mm wide by the distributor listing. Programming divider and power-down settings is handled through a three-wire serial interface, allowing the host controller to configure operating conditions during system startup or mode changes. The low phase-noise characteristic is relevant to receiver and transmitter designs where unwanted phase modulation can degrade signal quality. The 5 uA standby current supports low-power operating states, while the 25.7 mA typical supply current provides a basis for power-budget analysis. Typical applications include ISM-band wireless transceivers, RF front ends, wireless communications modules, local-oscillator generation, and communication boards requiring programmable RF or IF synthesis. System designers should account for reference-clock stability, supply decoupling, output routing, control-interface timing, and the device's package footprint during PCB layout. For a new design, validate the required output frequency, reference frequency, divider range, control protocol, supply voltage, and RF performance against the manufacturer datasheet before layout release. This page consolidates the verified distributor and manufacturer-linked information and clearly marks specifications that were not present in the supplied data rather than estimating them.

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SI4136-F-BM - 2.5 GHz RF Synthesizer | Skyworks
SI4136-F-BM

SI4136-F-BM - 2.5 GHz RF Synthesizer | Skyworks

Skyworks Solutions, Inc. SI4136-F-BM is an ISM-band RF frequency synthesizer with a 2 MHz to 50 MHz reference input, up to 2500 MHz output, three integrated VCOs, integrated loop filters, varactors, and resonators, and a 28-pin QFN exposed-pad package. The device is designed for wireless communications systems requiring local RF and IF synthesis with minimal external components. An RF frequency synthesizer is a clock-and-timing semiconductor that generates programmable, phase-locked radio-frequency outputs from a stable reference. It belongs to the frequency synthesizer -> PLL/VCO -> clock generator and timer -> clock and timing IC -> semiconductor hierarchy. In a wireless transmitter or receiver, this function converts a fixed reference into the accurately controlled local oscillator used by mixers, modulators, demodulators, and transmit signal chains. The SI4136-F-BM integrates multiple VCOs, phase detectors, dividers, loop filters, varactors, and resonators. Its verified operating characteristics include a 2 MHz to 50 MHz input range, a maximum output frequency of 2500 MHz, a 5 µA standby current, and a 25.7 mA typical supply current. These characteristics support dual-band wireless designs while reducing board area and external-component count. The synthesizer architecture allows divider and power-down settings to be programmed through a three-wire serial interface. That serial control supports automatic frequency selection and operating-state management in software-defined radios, WLAN equipment, satellite-radio receivers, and other RF communications products. Its integrated implementation also helps reduce RF routing complexity compared with discrete oscillator and divider chains. Typical uses include WLAN terminals, ISM-band transceivers, satellite-radio equipment, RF1/RF2/IF synthesis, and wireless communications basebands. Designers should preserve adequate reference-signal integrity, follow the manufacturer's recommended grounding and decoupling layout, and verify loop-filter settings when changing channel plans or reference frequencies. The principal design trade-off is lifecycle rather than electrical function. The SI4136-F-BM is identified as not recommended for new designs, and the verified distributor data identifies SI4136-F-GM as the recommended replacement. New designs should therefore evaluate that successor, while existing assemblies can use the documented family relationship for orderly transition planning. This page combines verified manufacturer-family specifications, distributor lifecycle information, package details, replacement guidance, and engineering-oriented selection notes. It is intended to support procurement, cross-reference, PCB transition, and design-review decisions without presenting unsupported component parameters as confirmed facts.

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SI4136-F-BT 2.5GHz RF Synthesizer | Skyworks Solutions
SI4136-F-BT

SI4136-F-BT 2.5GHz RF Synthesizer | Skyworks Solutions

Skyworks Solutions Inc. SI4136-F-BT is an ISM-band RF frequency synthesizer IC with integrated VCOs, specified for operation up to 2.5 GHz and supplied in a 24-pin TSSOP package measuring 4.40 mm wide. It combines programmable RF synthesis, integrated voltage-controlled oscillators, phase detectors, loop filters, reference dividers, and VCO dividers for wireless communication systems. The device uses a three-wire serial interface for divider, power-down, and operating-mode programming. A frequency synthesizer is a clock-and-timing IC that generates a stable, programmable output frequency from a fixed reference source. Within the broader signal-chain hierarchy, the SI4136 belongs to the RF synthesizer family, combines with phase-locked-loop and voltage-controlled-oscillator technologies, and ultimately supports wireless transmitter and receiver subsystems. Its integrated VCO architecture reduces the external frequency-generation component count compared with a discrete oscillator-and-divider implementation. The verified product listing identifies the SI4136-F-BT as a 2.5 GHz frequency synthesizer IC with one synthesis channel and a 24-TSSOP package. It also describes three integrated VCOs, loop filters, reference and VCO dividers, and phase detectors. These functions support programmable frequency generation for ISM wireless communications, where a stable reference clock can be converted into an RF carrier or intermediate-frequency signal. The 24-pin TSSOP package is surface mount and 4.40 mm wide, allowing reuse of compact wireless-control board layouts. Compared with larger leaded frequency-synthesizer packages, the surface-mount TSSOP reduces board footprint but requires careful assembly and exposed-trace thermal management. The three-wire serial control interface also allows an embedded controller to configure divider ratios, power-down behavior, and synthesizer settings. Typical uses include ISM wireless communications, WLAN-related radio equipment, satellite-radio signal generation, and other RF communication systems requiring a programmable local oscillator. The SI4136-F-BT can serve a transmitter channel, receiver down-conversion stage, or test and measurement equipment when a programmable RF source is required. Design evaluation must confirm the required output range, reference frequency, loop-filter configuration, channel spacing, and regulatory constraints for the target ISM band. When implementing the device, follow the manufacturer’s recommended reference, crystal, resonator, loop-filter, and decoupling networks without substituting values based only on generic synthesizer examples. PCB layout should keep the reference and RF paths short, provide a continuous ground reference, place decoupling capacitors close to the supply pins, and route high-frequency outputs over controlled-impedance traces. The serial interface must also be compatible with the host microcontroller’s voltage levels and timing requirements. This page consolidates the verified 2.5 GHz, 24-TSSOP, package-width, distributor, and cross-reference information with practical selection guidance, application notes, and same-family replacement analysis. It also distinguishes confirmed technical facts from parameters that require confirmation in the complete manufacturer datasheet before schematic release or production qualification.

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SI4136-F-GM - 2.5 GHz RF Synthesizer | Silicon Labs
SI4136-F-GM

SI4136-F-GM - 2.5 GHz RF Synthesizer | Silicon Labs

The Silicon Labs SI4136-F-GM is an RF frequency-synthesizer IC with a maximum listed frequency of 2.5 GHz, three integrated VCOs, and a 28-pin VQFN exposed-pad package. It operates from a 2.7 V to 3.6 V supply and uses a three-wire serial interface for divider and power-down programming. The device is intended for wireless RF and IF signal generation. An RF frequency synthesizer is a clock-and-timing semiconductor that generates a controlled output frequency from a reference signal. It combines a voltage-controlled oscillator, phase detector, loop filter, and programmable divider in one package. The SI4136-F-GM integrates three VCOs so multiple RF or IF frequencies can be synthesized for wireless communications, WLAN, satellite radio, and related RF signal chains. The verified distributor listings identify the SI4136-F-GM as a 2.5 GHz frequency synthesizer in a 28-pin VQFN exposed-pad package. Search results describe the device as an ISM RF synthesizer with integrated VCOs for wireless communications, while other listings identify RF wireless applications including WLAN and satellite radio. The operating supply range is listed as 2.7 V to 3.6 V. The Si4136 architecture provides programmable divider and power-down settings through a three-wire serial interface. This allows a host controller to configure synthesis operating conditions during system startup or when changing RF channels. Integrated VCO resources can reduce the need for external frequency-generation blocks in RF receiver, transmitter, and down-conversion designs. Typical applications include wireless LAN radio links, ISM-band communications, satellite-radio signal paths, RF receivers, and wireless transceivers. In these systems, the synthesizer supplies a controlled local oscillator or intermediate-frequency reference used by mixers, demodulators, and modulation blocks. The QFN package is intended for surface-mount assembly, while the exposed pad requires the PCB thermal and electrical land pattern specified by the manufacturer. Designers should confirm the complete pinout, recommended decoupling, loop-filter implementation, reference requirements, and exposed-pad layout against the manufacturer datasheet. They should also verify operating conditions and replacement parts rather than relying only on distributor descriptions. The verified source data provides the package, frequency, supply range, interface type, and application class, but does not provide all pin names or detailed electrical limits.

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SI4136-F-GMR - 2.5 GHz RF Synthesizer | Silicon Labs (Tape & Reel)
SI4136-F-GMR

SI4136-F-GMR - 2.5 GHz RF Synthesizer | Silicon Labs (Tape & Reel)

The Silicon Labs SI4136-F-GMR is an RF frequency-synthesizer IC with a maximum listed frequency of 2.5 GHz, three integrated VCOs, and a 28-pin VQFN exposed-pad package. It operates from a 2.7 V to 3.6 V supply and uses a three-wire serial interface for divider and power-down programming. The device is intended for wireless RF and IF signal generation. An RF frequency synthesizer is a clock-and-timing semiconductor that generates a controlled output frequency from a reference signal. It combines a voltage-controlled oscillator, phase detector, loop filter, and programmable divider in one package. The SI4136-F-GMR integrates three VCOs so multiple RF or IF frequencies can be synthesized for wireless communications, WLAN, satellite radio, and related RF signal chains. The verified distributor listings identify the SI4136-F-GMR as a 2.5 GHz frequency synthesizer in a 28-pin VQFN exposed-pad package. Search results describe the device as an ISM RF synthesizer with integrated VCOs for wireless communications, while other listings identify RF wireless applications including WLAN and satellite radio. The operating supply range is listed as 2.7 V to 3.6 V. The Si4136 architecture provides programmable divider and power-down settings through a three-wire serial interface. This allows a host controller to configure synthesis operating conditions during system startup or when changing RF channels. Integrated VCO resources can reduce the need for external frequency-generation blocks in RF receiver, transmitter, and down-conversion designs. Typical applications include wireless LAN radio links, ISM-band communications, satellite-radio signal paths, RF receivers, and wireless transceivers. In these systems, the synthesizer supplies a controlled local oscillator or intermediate-frequency reference used by mixers, demodulators, and modulation blocks. The QFN package is intended for surface-mount assembly, while the exposed pad requires the PCB thermal and electrical land pattern specified by the manufacturer. Designers should confirm the complete pinout, recommended decoupling, loop-filter implementation, reference requirements, and exposed-pad layout against the manufacturer datasheet. They should also verify operating conditions and replacement parts rather than relying only on distributor descriptions. The verified source data provides the package, frequency, supply range, interface type, and application class, but does not provide all pin names or detailed electrical limits.

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SI52112-B4-GT 100MHz PCIe Clock Generator | Skyworks
SI52112-B4-GT

SI52112-B4-GT 100MHz PCIe Clock Generator | Skyworks

The Skyworks Solutions SI52112-B4-GT is a 100 MHz PCI Express clock-generator integrated circuit in an 8-pin TSSOP package. According to the supplied distributor data, it provides one 100 MHz output and is categorized as an oscillator or clock-timing IC for PCI Express systems. The verified Skyworks family documentation describes Si52112-B4 as a two-output PCIe clock generator capable of supporting PCIe Gen 1, Gen 2, and Gen 3 requirements, with configurable AC parameters for signal-integrity optimization. A PCI Express clock generator is a clock-and-timing semiconductor that creates or distributes the reference clocks required by PCIe serializers, deserializers, controllers, and other digital logic. It belongs to the broader clock-generation and clock-distribution hierarchy, where accurate edge timing and low phase jitter help maintain reliable data transfer across high-speed differential links. The verified device information identifies a 100 MHz operating or output-clock figure and an 8-TSSOP surface-mount package. Skyworks states that the Si52112-B4 family can source two PCIe clocks from a 25 MHz crystal or clock input, provides frequency flexibility, and uses configurable AC parameters for signal-integrity optimization. The supplied sources also state compliance with PCIe Gen 1, Gen 2, and Gen 3 phase-jitter requirements and availability in an industrial temperature range. Typical uses include PCIe endpoint and root-complex clock trees, industrial computer expansion cards, embedded servers, storage controllers, network adapters, and test equipment that require a deterministic reference clock. The TSSOP package makes the device suitable for conventional surface-mount PCB assembly, while exact pin functions, electrical limits, output configuration, and crystal requirements should be taken from the manufacturer datasheet. When laying out a PCIe clock circuit, keep the oscillator or crystal path and clock outputs short, use controlled impedance routing for downstream links, and account for clock jitter, return loss, and power-supply noise. Confirm the package variant, pinout, output enable behavior, supply requirements, and intended PCIe generation against the official Si52112-B3/B4 datasheet before releasing a production design.

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SI52208-A01AGM - 8-Output PCIe Gen 1-6 Clock Generator | Skyworks
SI52208-A01AGM

SI52208-A01AGM - 8-Output PCIe Gen 1-6 Clock Generator | Skyworks

The Skyworks Solutions (formerly Silicon Labs) SI52208-A01AGM is an 8-output, low-power PCI Express clock generator IC delivering 100 MHz HCSL-compatible clocks with 0.085 ps RMS phase jitter for PCIe Gen 1/2/3/4/5/6 and SRIS applications, housed in a 48-pin QFN (6x6 mm) package with exposed thermal pad. The device operates from a 1.5 V to 1.8 V core supply and provides individually-controlled hardware enable pins plus I2C programmability for output enable, spread spectrum control, and frequency select. A PCIe clock generator is a specialized timing IC that produces the reference clocks required by PCI Express lanes on a motherboard or add-in card. Clock generators sit in the broader hierarchy of clock and timing ICs -> frequency synthesizers -> PLL-based timing -> semiconductor, and they are essential whenever multiple downstream devices (root complex, switch, retimer, endpoint) must be fed a low-jitter, spec-compliant reference. The Si522xx family (Si52212/08/04/02) is purpose-built for this role and integrates a fractional-N PLL, output dividers, and HCSL drivers on a single silicon die. Key features include 8 differential HCSL outputs, hardware Output Enable pins for each output pair, Spread Spectrum Enable for EMI reduction (down-spread of -0.25% / -0.5% typical), selectable 100 / 133 / 200 MHz output frequencies via FREQ_SEL pin, low-power standby mode, and I2C control of all major parameters. Typical jitter is 0.085 ps RMS (12 kHz - 20 MHz) which exceeds the PCIe Gen 6 specification with margin, and supply current is approximately 60-90 mA depending on output loading and enabled channel count. Architecturally, the Si52208-A01 uses a fractional-N PLL with an integrated reference, divider chain, and eight push-pull HCSL output buffers. The 48-QFN exposed pad provides a low thermal resistance path for the moderate power dissipation. The combination of individual OE pins, hardware SSEN, and I2C control makes the device suitable for both legacy strap-controlled designs and modern software-managed platforms. Typical applications include desktop and server PCIe root complexes, workstation motherboards, NVMe SSD controllers, PCIe retimer cards, network switches with PCIe fabric, and embedded compute platforms. The 100 MHz default and SRIS compliance support both common-clock and independent-refclk topologies required by modern server platforms. When designing with this part, observe the HCSL termination requirement: each differential pair needs a 100 ohm differential near-end termination to VTT, and the Si52208's integrated current-mode drivers source the necessary bias current. Decouple VDD with 0.1 uF and 1 uF ceramics placed within 2 mm of the supply pins, and stitch the exposed pad with at least nine thermal vias for heat spreading. This page synthesizes distributor pricing, same-family drop-in alternatives (Si52212, Si52204, Si52202), cross-brand equivalents (Renesas 9FGL08, IDT 9DBL08), and practical design notes not found in the manufacturer datasheet alone.

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SI52208-A02AGMR - 8-Output PCIe Gen 1-4 Clock Generator | Skyworks
SI52208-A02AGMR

SI52208-A02AGMR - 8-Output PCIe Gen 1-4 Clock Generator | Skyworks

The Skyworks Solutions SI52208-A02AGMR is an 8-output PCI Express clock generator for 1.5 V to 1.8 V PCIe Gen 1/2/3/4 and SRIS applications, housed in a 48-pin QFN (6x6 mm) package. It delivers 100 MHz, 133 MHz, or 200 MHz differential HCSL outputs with hardware- and I2C-controlled frequency selection, individual output enable pins, and integrated 85 ohm internal termination. It supports spread-spectrum enable/disable for EMI reduction, in line with PCIe Gen 1 through Gen 4 jitter requirements, plus SRIS-compliant operation. The A02 order code targets Gen 1/2/3/4 with 25 MHz LVCMOS reference input. A PCI Express clock generator is a dedicated timing IC that synthesizes the low-jitter reference clocks required by PCIe root complexes, endpoints, switches, and retimers. It belongs to the broader category of clock generators and timing ICs within the timing-and-signal-conditioning block of a computing platform, and is typically placed adjacent to the PCIe PHY or switch to minimize trace-induced jitter. Key features include a 1.5 V to 1.8 V supply range, low power consumption, hardware pin and I2C programmability for output enable and spread spectrum, and integrated 85 ohm source termination that eliminates external resistors on each differential output pair. Compliance with PCIe Gen 1/2/3/4 phase jitter and SRIS reference-clock architectures allows direct deployment in SRNS and SRIS systems without additional PLL stages. Typical applications include desktop and server PCIe slot clocking, NVMe SSD controllers, PCIe switch reference-clock trees, riser cards, and embedded-computing PCIe endpoints. The wide frequency support (100/133/200 MHz) covers Gen 1/2 (100 MHz) and Gen 3/4 (100 MHz with optional spread) plus a 25 MHz LVCMOS reference path for downstream clocking. When designing with this device, follow Skyworks reference-layout guidance for the 48-QFN exposed pad to achieve the published jitter and supply-noise performance. Decouple VDD with 0.1 microfarad plus bulk ceramic caps placed within 2 mm of the pins, and route differential pairs to maintain 100 ohm differential impedance with matched length within 5 mils. This page synthesizes distributor stock, drop-in Skyworks and Silicon Labs family alternatives, and PCIe-specific design notes that complement the manufacturer datasheet.

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