الساعة والتوقيت
المنتجات (480+)
SI4113-D-GT - 1.8 GHz Dual-Band RF Synthesizer | Skyworks
Skyworks Solutions SI4113-D-GT is a dual-band RF frequency synthesizer IC with integrated VCOs, an operating frequency listed as 1.8 GHz, RF1 and RF2 outputs, and a 24-pin TSSOP package measuring 4.40 mm wide. It is a phase-locked-loop timing device intended for dual-band, low-noise wireless frequency synthesis. According to Skyworks product data, the SI4113 family reduces external passive-component count and eliminates external VCOs and varactor diodes. A frequency synthesizer generates or translates a stable, programmable reference into an RF carrier used by wireless transmitters, receivers, and related communication equipment. The SI4113-D-GT combines a phase-locked loop with integrated voltage-controlled oscillators and RF output circuitry. Its dual-band architecture supports wireless personal-communications designs where compactness, low power, and reduced external component count are important. The verified distributor information identifies RF1/RF2 outputs, a 1.8 GHz operating frequency, one synthesizer circuit, and a 24-pin TSSOP package. Skyworks states that the device targets price-sensitive, low-power, high-performance personal wireless communications by reducing passive components, eliminating discrete VCOs and varactor diodes, improving power efficiency, and isolating external interference in silicon. These features make it useful in RF modulation and demodulation chains requiring local frequency generation. The part also appears in distributor listings under both Skyworks Solutions and legacy Silicon Laboratories naming. This distinction matters when searching for documentation or inventory: the manufacturer history is reflected in the search results, while the current distributor records identify Skyworks Solutions. The exact RF output power, tuning range, phase-noise figures, supply voltage, and control-interface details were not included in the supplied records and require confirmation from the manufacturer datasheet. Typical design uses include dual-band wireless transceivers, RF modulators, RF demodulators, IF-generation stages, compact communications modules, and low-power RF front ends. In a transmitter, the synthesizer can create the carrier or intermediate frequency while the PLL locks its output to a stable reference. Designers should preserve controlled impedance on RF traces, provide suitable grounding and decoupling, and verify loop-filter settings against the intended channel plan. The main design tradeoff is integration versus specialized flexibility: integrated VCOs simplify the BOM and reduce external interference pickup, but RF performance, output power, and frequency limits must be confirmed against the exact system requirements. The verified source record does not provide a manufacturer datasheet URL, complete electrical limits, or a full pinout, so those details remain explicitly unconfirmed rather than inferred. This page combines distributor specifications, package information, source links, application guidance, and a strict validation framework so engineers can distinguish verified facts from parameters that must be checked in the manufacturer datasheet.
SI4113-D-GTR - 1.8 GHz Dual-Band RF Synthesizer | Skyworks (Tape & Reel)
Skyworks Solutions SI4113-D-GTR is a dual-band RF frequency synthesizer IC with integrated VCOs, an operating frequency listed as 1.8 GHz, RF1 and RF2 outputs, and a 24-pin TSSOP package measuring 4.40 mm wide. It is a phase-locked-loop timing device intended for dual-band, low-noise wireless frequency synthesis. According to Skyworks product data, the SI4113 family reduces external passive-component count and eliminates external VCOs and varactor diodes. A frequency synthesizer generates or translates a stable, programmable reference into an RF carrier used by wireless transmitters, receivers, and related communication equipment. The SI4113-D-GTR combines a phase-locked loop with integrated voltage-controlled oscillators and RF output circuitry. Its dual-band architecture supports wireless personal-communications designs where compactness, low power, and reduced external component count are important. The verified distributor information identifies RF1/RF2 outputs, a 1.8 GHz operating frequency, one synthesizer circuit, and a 24-pin TSSOP package. Skyworks states that the device targets price-sensitive, low-power, high-performance personal wireless communications by reducing passive components, eliminating discrete VCOs and varactor diodes, improving power efficiency, and isolating external interference in silicon. These features make it useful in RF modulation and demodulation chains requiring local frequency generation. The part also appears in distributor listings under both Skyworks Solutions and legacy Silicon Laboratories naming. This distinction matters when searching for documentation or inventory: the manufacturer history is reflected in the search results, while the current distributor records identify Skyworks Solutions. The exact RF output power, tuning range, phase-noise figures, supply voltage, and control-interface details were not included in the supplied records and require confirmation from the manufacturer datasheet. Typical design uses include dual-band wireless transceivers, RF modulators, RF demodulators, IF-generation stages, compact communications modules, and low-power RF front ends. In a transmitter, the synthesizer can create the carrier or intermediate frequency while the PLL locks its output to a stable reference. Designers should preserve controlled impedance on RF traces, provide suitable grounding and decoupling, and verify loop-filter settings against the intended channel plan. The main design tradeoff is integration versus specialized flexibility: integrated VCOs simplify the BOM and reduce external interference pickup, but RF performance, output power, and frequency limits must be confirmed against the exact system requirements. The verified source record does not provide a manufacturer datasheet URL, complete electrical limits, or a full pinout, so those details remain explicitly unconfirmed rather than inferred. This page combines distributor specifications, package information, source links, application guidance, and a strict validation framework so engineers can distinguish verified facts from parameters that must be checked in the manufacturer datasheet.
SI4113-D-ZT1 - Dual-Band 1.8GHz RF Synthesizer | Skyworks
The Skyworks Solutions, Inc. SI4113-D-ZT1 is a dual-band RF frequency synthesizer IC with a maximum RF1 output frequency of 1.8 GHz, a 2.7 V to 3.6 V supply range, and a 24-pin TSSOP package. It supports RF1 synthesis from 900 MHz to 1.8 GHz, RF2 synthesis from 750 MHz to 1.5 GHz, and IF synthesis from 62.5 MHz to 1 GHz. A frequency synthesizer is a clock-and-timing semiconductor that locks an internal voltage-controlled oscillator to a stable reference, allowing a system to generate programmable RF and intermediate-frequency signals. The SI4113-D-ZT1 belongs to the PLL frequency synthesizer family, combining phase-locked loops, voltage-controlled oscillators, frequency dividers, phase detectors, and loop filters in one integrated circuit. The device includes three synthesis paths, integrated VCOs, loop filters, varactors, and resonators. Its RF1 range extends to 1.8 GHz, RF2 reaches 1.5 GHz, and the IF path covers 62.5 MHz to 1 GHz. Programmable power-down modes are available, and the listed standby current is 1 µA with typical operating supply current of 18 mA. The monolithic architecture reduces the number of external RF components to a minimum of two according to the manufacturer data. This integration is valuable in wireless transmitters and receivers because the synthesizer supplies coherent, programmable frequencies while avoiding a large collection of discrete VCO, divider, detector, and filter components. Its low phase noise is another principal benefit for communications equipment. Typical uses include dual-band wireless communications, RF transceivers, IF generation, cellular equipment, and other RF systems requiring multiple locally generated frequencies. The part operates from a 2.7 V to 3.6 V supply and is offered in a compact 24-pin TSSOP package measuring approximately 0.173 inch by 4.40 mm. Designers should preserve adequate loop-filter bandwidth for the intended channel plan and verify that the selected reference frequency supports the required division ratios. PCB layout must keep reference and RF connections short, provide solid ground return paths, and decouple the supply close to the device. The SI4113-D-ZT1 is marked not recommended for new designs, so new equipment should evaluate the manufacturer-recommended SI4113-D-GM replacement. This page combines verified distributor lifecycle information, manufacturer-derived operating ranges, package information, and same-footprint replacement guidance. It also provides application-focused design notes and a structured comparison to help engineers identify the correct migration path without changing the 24-pin TSSOP board footprint.
SI4114G-B-GM - 1.99 GHz RF Synthesizer | Silicon Labs
The Silicon Labs SI4114G-B-GM is a single-circuit frequency synthesizer with a PLL, clock input, clock output, and a maximum frequency of 1.99 GHz, supplied in a 28-pin QFN package. Designed for RF synthesizer applications associated with direct-conversion GSM and GPRS wireless communications, it combines an integrated VCO and phase-locked-loop architecture in one device. Its identified supply-voltage range is 2.7 V to 2.9 V. A frequency synthesizer is a clock-and-timing device that generates, multiplies, divides, or locks a reference-derived output frequency to a stable phase relationship. A PLL, or phase-locked loop, compares a divided feedback signal with an input reference and adjusts a controlled oscillator until the loop reaches lock. In the wireless RF signal chain, a frequency synthesizer provides the local oscillator used by mixers to translate information between the carrier frequency and baseband. The SI4114G-B-GM belongs to the broader clock-generation and timing-control hierarchy that includes PLL synthesizers, RF synthesizers, and integrated VCO devices. Key verified features include one synthesizer circuit, PLL operation, a clock input, a clock output, and a maximum supported frequency of 1.99 GHz. The 2.7 V to 2.9 V operating supply range places the device in a low-voltage RF integration environment. The part is associated with a 28-pin QFN package and is offered in a GM-related ordering configuration. Additional operating details, including exact output-frequency limits, tuning range, reference-input conditions, lock time, phase-noise values, temperature limits, and package dimensions, were not included in the supplied verified records. Technically, the SI4114G-B-GM integrates the VCO with PLL synthesis functions intended for direct-conversion RF receivers. This integration can reduce the number of separate frequency-generation blocks required around a mixer, although the final receiver design must still satisfy required tuning range, reference frequency, phase-noise, spur, and temperature requirements. Because a PLL synthesizer depends on both its reference source and loop-filter implementation, good reference routing, controlled supply impedance, and deliberate ground-plane design remain essential. Typical uses include GSM and GPRS direct-conversion receivers, RF transceiver intermediate-frequency sections, and other wireless communication systems requiring a local oscillator below the verified 1.99 GHz maximum frequency. The device may also be relevant to custom RF test equipment or legacy receiver platforms, provided the designer verifies every electrical and timing parameter against the manufacturer datasheet before committing the part to a new PCB. Designers should not treat the Mouser replacement note as proof that any Si41xx-D-GM product is a one-for-one drop-in replacement. The manufacturer guidance describes multiple Si41xx-D-GM devices, so board-level compatibility, pin assignment, control registers, reference frequency, tuning range, and RF performance must all be checked. The SI4114G-B-GM is also marked not recommended for new designs, making lifecycle risk a primary selection criterion. This page consolidates the verified distributor information, package and application context, lifecycle warning, source links, and engineering cautions for SI4114G-B-GM. It distinguishes confirmed specifications from unavailable datasheet details and avoids presenting generic cross-reference tools as verified, pin-compatible replacements.
SI4114G-BM RF Synthesizer | Silicon Labs
The Silicon Labs SI4114G-BM is an RF frequency synthesizer with integrated voltage-controlled oscillators for direct-conversion E-GSM 900, DCS 1800, PCS 1900, and GPRS wireless systems. The verified source identifies a 28-QFN package, while operating frequency, phase-noise, tuning-range, supply-voltage, and electrical-limit details remain unavailable in the supplied records. The part is positioned as a legacy RF synthesizer rather than a current general-purpose clock generator. An RF frequency synthesizer generates a controllable, stable carrier or local-oscillator signal for wireless transmitters and receivers. In a direct-conversion receiver, synthesizer output can be mixed directly with the received RF signal, while in a transmitter it establishes the carrier frequency. Integrating the VCO with the synthesizer reduces the number of separate RF signal-path components and supports compact multiband radio designs. The SI4114G family was developed for multiband GSM and GPRS equipment. Silicon Labs states that it performs multiband RF synthesis for E-GSM 900, DCS 1800, and PCS 1900 applications. Its cited fast transient response makes it particularly relevant to GPRS multislot systems, where channel switching and settling performance influence receiver or transmitter readiness. The SI4114G-BM is identified as an RF synthesizer in a 28-QFN package. The supplied distributor results do not expose a complete current price table, operating-temperature range, pin map, output-power specification, tuning range, or phase-noise data. Those values must be taken from the manufacturer datasheet and verified against the exact ordering code before layout or production use. Typical legacy uses include GSM handset receivers and transmitters, multislot GPRS terminals, direct-conversion radios, and RF test equipment. The exact RF band, channel spacing, reference frequency, loop bandwidth, and board environment must be checked against the manufacturer document before selecting the device. For a new design, evaluate the modern Si41xx-D-GM family named by Mouser as the recommended replacement family rather than assuming that every Si41xx device is pin-compatible. Migration should be treated as a redesign unless the replacement's package, pinout, RF band plan, control interface, and timing behavior have all been verified. This page consolidates the supplied manufacturer-related PDF record, distributor lifecycle guidance, and cross-reference findings. It separates verified facts from missing electrical data rather than estimating unstated synthesizer parameters or presenting a non-pin-compatible modern family as a drop-in replacement.
SI4115G-BM PLL Clock Synthesizer | Silicon Labs
The Silicon Labs SI4115G-BM is a frequency synthesizer and phase-locked-loop clock integrated circuit associated with GSM/GPRS and external-synthesis applications. The verified product data confirms its clock-generator and frequency-synthesizer classification, but it does not provide a verified frequency range, supply voltage, output configuration, pin count, or package dimensions. Accordingly, those technical values remain data-needed rather than being inferred. The component is associated with the MLP-28 package in the available cross-reference data. A phase-locked loop, or PLL, is a frequency-control circuit in which an internal oscillator is phase and frequency aligned to a reference input. In clock-generator and frequency-synthesizer ICs, this architecture supports clock distribution, frequency multiplication or division, and generation of timing signals required by communications and digital systems. The SI4115G-BM belongs to the broader Clock & Timing > Clock Generators, PLL, and Frequency Synthesizers category. The verified distributor and manufacturer listings identify SI4115G-BM as a clock and timing IC associated with frequency synthesis and legacy wireless applications. The listing snippets specifically reference GSM/GPRS synthesis and external synthesis, providing application context without supplying enough verified electrical data to specify operating conditions. Users should obtain the original manufacturer datasheet before making a board-level substitution or timing-design decision. Typical design uses for this product family include RF and baseband clock generation, wireless transceiver timing, communications infrastructure, and embedded systems requiring a stable synthesized clock. However, exact suitability depends on required reference frequency, output frequency, channel spacing, loop bandwidth, supply voltage, jitter, and package-level pin compatibility. Those values must be confirmed from the manufacturer documentation. A legacy replacement should not be treated as drop-in solely because another PLL has a similar function. The verified search results mention Si4126-F-GM as a recommended replacement, but they do not establish that it shares the MLP-28 footprint, pinout, frequency range, or electrical parameters with SI4115G-BM. PCB migration therefore requires formal comparison of package drawings, pin names, supply rails, and timing specifications. This page combines the available verified distributor listings, package information, lifecycle concerns, and replacement guidance with explicit uncertainty markers. It is intended to support component identification and sourcing research rather than substitute for the original manufacturer datasheet or a complete engineering cross-reference.
SI4122-BT - 1.5 GHz Dual-Band RF Synthesizer | Silicon Labs
The Silicon Labs SI4122-BT is a 1.5 GHz dual-band RF frequency-synthesizer IC with integrated VCOs, loop filters, varactors, and resonators, supplied in a 24-pin TSSOP package. It operates from a 2.7 V to 3.6 V supply, features programmable power-down modes, and requires only two external components according to the available manufacturer-related data. A frequency synthesizer is a clock-and-timing IC that generates a stable output frequency from a reference signal. This synthesizer supports wireless-communication RF signal chains, where programmable frequency generation is used for local oscillators, transceivers, and related RF functions. Its 1.5 GHz headline specification identifies the supported synthesis range in the distributor data, while the dual-band architecture supports wireless RF signal-generation requirements. The SI4122-BT is identified as a frequency-synthesizer IC with a 1:2 input-to-output ratio in the available distributor records. The available data also reports 18 mA typical supply current, 1 µA standby current, 3.6 V operation, and integrated VCO, loop-filter, varactor, and resonator functions. These features are useful where designers want to minimize external RF support components and simplify the synthesizer implementation. The 24-TSSOP package has a 0.173 inch, or 4.40 mm, width according to the DigiKey result. It is a surface-mount package, and the available distributor data identifies a 24-pin TSSOP with SMD/SMT mounting. Exact pin names, operating-temperature limits, phase-noise figures, frequency ranges by band, and full electrical limits were not supplied in the verified data and are therefore not inferred here. Typical applications include wireless-communication transmitters and receivers, RF transceiver local-oscillator paths, dual-band RF signal generation, and embedded RF systems requiring a programmable synthesizer. Designers should confirm the complete pinout, reference requirements, loop-filter configuration, and band-specific operating limits against the manufacturer datasheet before layout or firmware release. For implementation, preserve the supplied 24-pin TSSOP footprint and validate the reference and RF routing according to the manufacturer’s layout guidance. The integrated resonator and VCO functions can reduce external component count, but RF layout, grounding, decoupling, and keep-out requirements remain critical. This page consolidates verified distributor specifications, sourcing links, packaging information, and design considerations while clearly identifying parameters that still require datasheet confirmation.
SI4122-D-GM - 1.5 GHz Dual-Band RF Synthesizer | Skyworks
Skyworks Solutions Inc. SI4122-D-GM is a 1.5 GHz dual-band RF frequency synthesizer IC with RF2 and IF outputs, housed in a 28-pin VQFN surface-mount package with an exposed pad. Its stated operating frequency ranges are 900 MHz to 1800 MHz and 750 MHz to 1500 MHz, while output power spans -14 dBm to 1 dBm. The device operates from a 2.7 V to 3.6 V supply and consumes 18 mA to 27 mA. An RF frequency synthesizer is a phase-locked-loop device that generates or translates a stable high-frequency carrier from a reference clock. Within the broader semiconductor hierarchy, the SI4122-D-GM is a PLL-based clock and timing IC, an RF synthesizer, and ultimately an integrated circuit used for wireless frequency generation. Its integrated VCOs reduce the need for external VCO components and varactor diodes, supporting compact and power-efficient wireless transmitter or receiver designs. Key features include support for IF and dual-band RF synthesis, integrated VCOs, RF2 and IF outputs, and a usable upper frequency of 1.5 GHz. According to the available manufacturer information, the device is designed to reduce external passive-component count and eliminate external VCOs and varactor diodes. Those characteristics make it suitable for price-sensitive, low-power personal wireless communications equipment where integration and board area are important. Technically, the device combines a phase-locked loop, integrated voltage-controlled oscillators, reference and RF synthesis functions, and an IF output path. The available product data specifies a supply-voltage range of 2.7 V to 3.6 V and current consumption of 18 mA to 27 mA. Exact phase noise, tuning-step, reference-input, temperature-coefficient, lock-time, and output-impedance details were not included in the supplied source data and therefore require confirmation from the manufacturer datasheet before final design release. Typical applications include cellular and personal wireless communication equipment, dual-band RF front ends, wireless handsets, RF modems, and other systems requiring local RF carrier generation. The integrated VCO arrangement is particularly relevant to compact designs that cannot accommodate separate discrete VCO and varactor networks. The 2.7 V to 3.6 V operating range also allows use with low-voltage RF system rails. Designers should preserve the exposed-pad thermal and electrical requirements of the 28-pin VQFN package and follow the manufacturer layout guidance for high-frequency RF routing. Reference, feedback, supply, and output paths should be kept short and appropriately decoupled. Since detailed loop-filter, reference-sensitivity, and decoupling values were not supplied in the verified excerpts, they must be taken directly from the official datasheet rather than inferred. This product page consolidates verified distributor pricing, package and operating information, available same-family alternatives, and application-specific engineering guidance into one engineering reference. It also clearly separates confirmed parameters from data that still requires datasheet confirmation, helping designers avoid unsupported assumptions during schematic and PCB-layout reviews.
SI4122-D-GMR - 1.5GHz RF Synthesizer | Silicon Labs
The Silicon Labs SI4122-D-GMR is a dual-band RF frequency synthesizer IC with integrated VCOs, a maximum RF output frequency of 1.5 GHz, and operation from a 2.7 V to 3.6 V supply in a 28-pin QFN exposed-pad package. The device accepts a reference or crystal-related input described in distributor data as 2 MHz to 26 MHz and generates RF and IF outputs, making it suitable for wireless communications and other frequency-generation systems. An RF frequency synthesizer is a clock-and-timing semiconductor that combines a phase-locked loop, frequency dividers, and voltage-controlled oscillators to produce stable, programmable output frequencies. The broader hierarchy is frequency synthesizer > PLL-based clock generator > clock and timing IC > semiconductor. The SI4122-D-GMR belongs to the Silicon Labs Si41xx family of integrated RF synthesizers, designed to reduce the number of discrete RF components required in a receiver or transmitter signal chain. Verified product information identifies the SI4122-D-GMR as a single PLL-based frequency synthesizer with divider and multiplier functions. Its supply range is 2.7 V to 3.6 V, its operating-temperature range is -40 °C to +85 °C, and its RF output extends to approximately 1.5 GHz. One distributor listing describes a 1,720 MHz output configuration, while another characterizes the device generically as a 1.5 GHz maximum-frequency synthesizer; engineers should consult the manufacturer datasheet for the exact configuration encoded by the full ordering code. The dual-band architecture is significant in wireless receiver and transmitter designs because separate synthesis paths can support RF and IF outputs without requiring unrelated external oscillator arrangements. The integrated VCOs also reduce board area compared with a discrete approach, although loop-filter selection, reference routing, output matching, supply filtering, and control-software sequencing remain essential design tasks. Exact phase-noise, tuning-range, divider-ratio, current-consumption, and lock-time figures were not present in the supplied verified data and therefore are not asserted here. Typical uses include wireless communications equipment, RF and IF signal-chain generation, test and measurement systems, and industrial RF modules. In a receiver, the synthesizer can establish the local oscillator needed by a mixer or downstream conversion stage. In a transmitter, it can provide a programmable carrier while a separate loop filter and reference system establish frequency accuracy and stability. Designers should preserve the exposed-pad thermal and electrical requirements of the 28-QFN package, place supply bypass capacitors close to the device, and follow the manufacturer layout and component-selection guidance for the VCO loop filter. Because the provided snippets conflict on whether the highlighted 1,720 MHz figure is a fixed maximum or configuration-specific output, verify the relevant register settings and frequency plan against the official datasheet before releasing a PCB. This product synthesis consolidates verified distributor specifications, package information, lifecycle indicators, related-family options, and practical engineering guidance. It also identifies where pin-level, phase-noise, and configuration-specific information remains necessary so procurement and design decisions are based on traceable evidence rather than inferred specifications.
SI4122-D-GT - Dual-Band RF Synthesizer | Silicon Labs
The Silicon Labs SI4122-D-GT is a dual-band RF synthesizer with integrated voltage-controlled oscillators for wireless communications, covering 750 to 1500 MHz and 900 to 1800 MHz in a 24-pin TSSOP surface-mount package. It accepts a 2 MHz to 26 MHz reference input, operates from a 2.7 V to 3.6 V supply, and provides an RF2/IF synthesizer output. An RF synthesizer is a frequency-generation IC that combines a phase-locked loop, frequency dividers, and one or more VCOs to produce coherent high-frequency signals. In the broader electronics hierarchy, it belongs to clock and timing ICs, frequency synthesizers, and phase-locked-loop devices. Its integrated VCOs reduce the need for external oscillators, varactor diodes, and associated passive networks in cost-sensitive wireless transmitters and receivers. Key operating characteristics include an output-power range of -14 dBm to 1 dBm, harmonic content from -26 dBc to -20 dBc, and supply-current consumption between 18 mA and 27 mA. The 1.5 GHz device designation and dual-band coverage support RF communication architectures operating near the upper GSM, DCS1800, and PCS1900 frequency regions. The 24-pin TSSOP body is approximately 4.40 mm wide according to the distributor data. The SI4122-D-GT uses phase-locked-loop signal generation to establish the required output frequency and phase relationship. Its RF2/IF output arrangement is intended for wireless communication systems requiring a local oscillator or intermediate-frequency signal. Exact phase-noise, reference-input sensitivity, tuning-step, lock-time, and temperature-coefficient values are not present in the supplied verified results and must be checked against the manufacturer datasheet before final design release. Typical applications include GSM and DCS-style cellular equipment, dual-band wireless transceivers, RF up-converter and down-converter local-oscillator paths, intermediate-frequency generation, and cost-sensitive industrial RF modules. The integrated-VCO architecture can shorten RF design cycles while reducing external component count and improving integration against environmental interference. When laying out a replacement board, preserve the 24-pin TSSOP footprint, verify every exposed and supply connection against the original pinout, and place support components according to the manufacturer reference circuit. The 2.7 V to 3.6 V operating range leaves little margin for supply excursions, so regulation, bypass placement, grounding, and VCO loop stability require careful review. This product record consolidates verified distributor availability, frequency-band data, package information, and same-package cross-reference candidates with practical selection guidance. It highlights verified differences among related Silicon Labs parts so engineers can distinguish true footprint matches from devices that merely share the same package family.
SI4122-D-GTR - 1.5 GHz RF Synthesizer | Skyworks Solutions
Skyworks Solutions SI4122-D-GTR is a dual-band RF frequency synthesizer IC with integrated VCOs, a maximum operating frequency of 1.5 GHz, one synthesizer circuit, and a 24-pin TSSOP surface-mount package measuring 0.173 inch wide by 4.40 mm. The device generates RF2 and IF outputs for wireless communication systems and requires only two external components according to the manufacturer information included in the verified distributor data. A frequency synthesizer is a clock-and-timing IC that combines a phase-locked loop, voltage-controlled oscillator, reference divider, programmable counters, and control logic to produce an output frequency locked to an external reference. Within the product hierarchy, the SI4122-D-GTR is a PLL frequency synthesizer, clock generator, RF synthesizer, and clock-and-timing semiconductor. Its integrated VCO architecture reduces the need for external oscillators, varactors, resonators, and discrete loop-filter components. Key verified characteristics include a 1.5 GHz maximum frequency, one synthesizer circuit, a clock input, a clock output, a non-differential input and output configuration, and programmable power-down modes. The SI4122-D-GTR also offers low phase noise and a standby current of 1 µA. These characteristics make the device relevant to wireless communications equipment in which compact synthesizer implementation and reduced external-component count are important design objectives. Technically, the device is identified as an RF synthesizer with RF2 and IF outputs rather than a general-purpose clock generator. Its PLL-based architecture is intended to support precise frequency generation from a stable reference source. The verified snippets describe an input-to-output ratio of 1:2, but detailed operating bands, reference-frequency limits, tuning resolution, phase-noise curves, loop-filter settings, supply-voltage limits, and lock-time limits are not present in the supplied data and therefore should not be inferred. Typical uses include RF front-end local oscillators, dual-band wireless transceivers, intermediate-frequency generation, and compact radio equipment. The SI4122-D-GTR is particularly suitable when integrating an RF2/IF synthesizer into a 24-pin TSSOP design is preferable to implementing a discrete VCO and PLL arrangement. Its integrated VCOs can reduce board area and assembly effort while preserving programmable synthesis across the intended RF operating ranges. A key design consideration is that synthesizer performance depends on the reference signal, loop-filter components, supply decoupling, layout symmetry, and the intended output frequency. Engineers should follow the manufacturer datasheet and reference circuitry for component values, grounding, RF routing, and lock-detection implementation. The exact pin assignments are not included in the verified web data, so this page does not publish an unverified pinout or recommend substitutions without schematic-level review. This page consolidates verified distributor specifications, package information, same-package family candidates, and practical selection guidance. It also separates verified facts from unavailable electrical details, helping engineers identify the SI4122-D-GTR quickly while avoiding unsupported assumptions about pricing, compliance, pin assignments, or drop-in interchangeability.
SI4123-BM - 1.8GHz Dual-Band RF Synthesizer, 28-QFN | Silicon Labs
The Silicon Labs SI4123-BM is a monolithic dual-band RF frequency synthesizer with integrated VCOs, loop filters, varactors, and resonators, operating up to 1.8 GHz in a 28-pin QFN (5x5 mm) exposed-pad package. It accepts a 2 MHz to 26 MHz crystal reference and delivers programmable RF output through a 1:2 input-to-output divider chain, drawing 18 mA typical supply current from a 2.7V to 3.6V single rail. A frequency synthesizer is a closed-loop building block inside a wireless transceiver that generates a stable, programmable local-oscillator (LO) signal by phase-locking a voltage-controlled oscillator to a low-frequency crystal reference. Synthesizers sit within the signal-chain hierarchy of mixer -> LNA -> IF/baseband; they belong to the broader category of clock and timing ICs alongside PLLs, VCOs, and clock generators. Integrating the VCO, varactor, loop filter, and resonator on-die eliminates dozens of external components that a discrete PLL+VCO implementation would require. Key features of the SI4123-BM include a dual-band architecture supporting both low-IF and high-band RF outputs from a single IC, integrated loop filter and resonator for minimal external BOM, 1 microamp standby current with programmable power-down modes, and low phase noise suitable for GSM/cellular local-oscillator roles. The 28-VFQFN exposed-pad package provides a low thermal-resistance path to PCB copper, important when the part is biased continuously in a radio that does not sleep deeply. Architecturally, the Si4123 family uses Silicon Labs' proven bipolar RF process and a fractional-N topology with multi-modulus prescalers. The integrated VCOs cover the two RF bands used by legacy 2G/ISM radios; output frequency, reference division, and charge-pump current are all programmed through a simple three-wire serial interface. The combination of integrated resonators and on-die loop filter means the design needs only a crystal and a couple of bypass caps to produce a clean LO. Typical applications include GSM/GPRS handset local-oscillator generation, ISM-band 433/868/915 MHz radios, dual-band cordless phone transceivers, and wireless metering links. The 1.8 GHz ceiling also covers early Wi-Fi and proprietary 2.4 GHz sub-harmonic upconversion stages when the output is followed by a doubler. When designing with the SI4123-BM, ensure the exposed pad is soldered to a continuous ground pour with multiple thermal vias; a floating EP will cause VCO pulling and degraded phase noise. The 1 microamp standby current only applies when the serial interface holds the part in its deepest power-down state, so the host MCU must drive the appropriate register sequence to actually achieve it. This page consolidates distributor pricing, drop-in package-compatible alternatives, and practical design notes that are not presented together in the manufacturer datasheet.
SI4123-BT - 1.8 GHz Dual-Band RF Synthesizer | Silicon Labs
The Silicon Labs SI4123-BT is a 1.8 GHz dual-band RF frequency-synthesizer IC with integrated VCOs, loop filters, varactors, and resonators for wireless communications. It operates from a 2.7 V to 3.6 V supply, supports a 24-pin TSSOP package, and requires only two external components according to the available manufacturer-related data. The device is designed for RF signal generation, frequency control, and wireless communication systems. A frequency synthesizer generates or controls a stable reference-related output by combining a phase-locked loop, voltage-controlled oscillator, and frequency-setting network. In wireless equipment, this type of RF synthesizer establishes the local oscillator used by transmit and receive signal chains. The SI4123-BT integrates multiple RF oscillator functions into one IC, reducing board area and external-component count while keeping the RF frequency-generation function close to the system antenna and transceiver circuitry. Key verified features include integrated VCOs, integrated loop filters, integrated varactors, integrated resonators, programmable power-down modes, low phase noise, a 1 uA standby current, and approximately 18 mA typical supply current. The available data also identifies 3.6 V operation and a 24-pin TSSOP package. Exact tuning range, phase-noise curves, control-interface details, temperature limits, and output-power specifications are not provided in the verified search data and must be confirmed from the manufacturer datasheet before design release. The SI4123-BT is suited to wireless communication modules, RF transceivers, frequency-generation circuits, industrial RF equipment, and compact embedded radio systems. Its integrated architecture can help reduce component count in designs where PCB area is constrained. The 24-TSSOP footprint is also convenient for conventional surface-mount assembly, although RF layout remains critical because high-frequency interconnects and supply-return paths can affect oscillator performance. The primary design consideration is to verify the complete electrical and timing envelope against the current Silicon Labs datasheet. Place the device according to the recommended decoupling and grounding arrangement, keep the RF output path short, and avoid routing sensitive oscillator and feedback nets beneath or beside unrelated switching nodes. Confirm the required external resistor, capacitor, and reference values before manufacturing; the verified data does not provide those values. This page summarizes verified distributor specifications, package information, and practical design considerations for the SI4123-BT. It does not invent missing electrical parameters, pricing, pin functions, lifecycle claims, or drop-in replacements that cannot be verified from the supplied sources.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.