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PT7C4339WEX - Low Power I2C Real Time Clock | Diodes Inc
The Diodes Incorporated PT7C4339WEX is a low-power consumption I2C Real-Time Clock (RTC) module with clock/calendar functionality, supplied in an 8-pin SOIC (0.154", 3.90 mm body width) package. It integrates a serial interface, power-fail detector, programmable square-wave output, and a 56-byte non-volatile SRAM for backup storage, all on a single CMOS die. The part is widely used as a drop-in replacement for legacy RTCs in industrial controllers, metering, and embedded systems. Source: Diodes Incorporated product page (PT7C4339 datasheet family) and distributor listings on DigiKey and Mouser as of 2026-10-10. A Real-Time Clock (RTC) is a dedicated integrated circuit that keeps track of wall-clock time - seconds, minutes, hours, day, date, month, and year - independent of the host processor. RTCs are essential in any embedded system that must maintain accurate time during power-down, power-up events, or processor sleep modes. The PT7C4339 specifically implements the I2C (Inter-Integrated Circuit) 2-wire serial protocol, communicating on a standard I2C bus at speeds up to 400 kHz. Key features include automatic leap-year compensation up to year 2100, a wide operating voltage range, low timekeeping current draw in the microamp range, and an integrated power-fail circuit that automatically switches to a backup battery when VCC drops below a programmable threshold. The PT7C4339 maintains time accuracy of typically +/-2 ppm at 25C, equivalent to a drift of less than one minute per year. The 8-SOIC package (3.90 mm body) is a JEDEC-standard surface-mount form factor compatible with hand-soldering and standard reflow profiles. The PT7C4339 communicates via the I2C bus with a fixed slave address and registers arranged in BCD (Binary Coded Decimal) format. Engineers typically access the device through I2C read/write transactions, where the master first sends the device address with the R/W bit, then the register pointer, and finally the data byte. Built-in address recognition and write-protect logic protect against unintended writes during brown-out events. Typical applications include battery-backed timekeeping in metering and datalogging, embedded industrial controllers, point-of-sale terminals, and consumer electronics that need accurate wall-clock time without burdening the main microcontroller. The wide VCC tolerance makes it equally suitable for 3.3V microcontroller systems and legacy 5V designs. When designing with the PT7C4339, always observe the bypass capacitor recommendation: place a 0.1 uF decoupling cap as close as possible to VCC. For backup battery operation, ensure the backup cell voltage stays within the device-specified VBACK range, and consider the trickle-charge resistor selection carefully to avoid damaging lithium coin cells. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in a single manufacturer datasheet - the analysis is based on cross-checking the Diodes PT7C4339 datasheet family, the Pericom legacy datasheet (PT7C4339WEX is sold both as Diodes Incorporated and historically as Pericom Semiconductor), and current distributor inventory as of 2026-10-10.
RX8900CE - DTCXO RTC I2C 10-SMD | Epson | TCXO
The Epson RX8900CE is a real-time clock (RTC) module integrating a high-precision digital temperature compensated crystal oscillator (DTCXO) with built-in power switching and an I2C interface in a compact 10-pin SMD package. It provides ±5 ppm (approximately ±2 minutes per year) timekeeping accuracy across the full -40 °C to +85 °C operating range, with a 1.6 V to 5.5 V supply range and selectable I2C address via the I2C_SEL pin. A Real-Time Clock (RTC) is a low-power integrated circuit that maintains accurate wall-clock time (seconds, minutes, hours, days, date, month, year) even when the host system is powered off, typically backed by a battery or supercapacitor. RTCs fall within the broader category of clock/calendar ICs, themselves a subset of power management and timing components. By integrating a TCXO and the crystal into one SMD module, the RX8900CE eliminates the need for an external 32.768 kHz quartz and the associated load-capacitor design trade-offs, simplifying layout and BOM. Key features include ±5.0 ppm frequency stability over temperature, integrated 32.768 kHz DTCXO with on-chip crystal, an automatic power-switching circuit that seamlessly transitions between primary VDD and backup battery, two user-programmable alarm / time-update interrupts, and an I2C-bus interface (400 kHz Fast Mode compatible). Additional functions include a 32.768 kHz output pin for clocking an external MCU, century bit for dates beyond 2099, and a 12/24 hour timekeeping mode. Internally the device uses a 32.768 kHz AT-cut crystal in conjunction with a fractional-N DTCXO compensation loop. The compensation register is trimmed during factory calibration to suppress the parabolic frequency-temperature curve, leaving a residual error dominated by linear slope. This architecture delivers near-OCXO accuracy in a module that costs and consumes roughly the same as an uncompensated RTC. Typical applications include industrial IoT gateways and data loggers, metering and smart-grid endpoints, automotive infotainment and telematics requiring wide-temp accuracy, security/alarm panels with battery backup, and consumer electronics that must retain time during power loss. The wide -40 °C to +85 °C operating range makes it a strong fit for outdoor and automotive-grade designs. When designing with the RX8900CE, ensure the backup battery is sized so that the VDD-to-BAT switchover voltage (typical 2.2 V) is not crossed during a normal power cycle. Decoupling must include a 0.1 µF ceramic close to VDD; the integrated crystal removes the need for external load capacitors but the I2C bus still requires pull-ups. Allow the TCXO ~2 s after VDD restoration to deliver its full accuracy. This page synthesizes distributor pricing, drop-in alternatives within the same Epson RX-89xx family, and practical design notes that are not consolidated in the manufacturer datasheet.
SI4112-BM - 1 GHz IF Synthesizer | Silicon Labs
Silicon Labs SI4112-BM is a 1 GHz frequency-synthesizer IC with an integrated VCO, supplied in a 28-pin MLP package with an exposed pad. It is intended for IF signal generation in wireless communications equipment and is listed as an obsolete EOL device. The verified distributor listing identifies one synthesizer circuit, surface mounting, a 5x5 mm package, and an operating range of -40°C to 85°C. The Si4112-D family performs IF and dual-band RF synthesis, reducing external passive components and eliminating external VCOs and varactor diodes according to the manufacturer product-page result. A frequency synthesizer is a clock-and-timing integrated circuit that generates a controlled output frequency from a reference source. The PLL and integrated VCO provide a compact way to produce stable intermediate-frequency signals in RF receivers, transmitters, and communication systems. In the product hierarchy, this part is a frequency-synthesizer IC, then a PLL/clock-and-timing IC, then a timing and RF synthesis building block within a wireless communication system. The verified listing gives the device's headline frequency capability as 1 GHz. Its 28-VFQFN exposed-pad package is intended for compact surface-mount designs and provides a defined thermal and electrical land pattern. Because the exposed pad is part of the package, the PCB footprint must include the manufacturer's recommended thermal-pad connection and layout. The listed operating temperature range is -40°C to 85°C. Other detailed electrical timing, phase-noise, current, supply-voltage, and tuning-range values were not included in the supplied data and must be confirmed from the manufacturer datasheet before design release. Typical applications include IF synthesis in wireless personal communications, RF receiver and transmitter signal chains, and other communication systems requiring a compact integrated synthesizer. The integrated VCO can reduce the external component count compared with a discrete VCO implementation, but it does not remove the need to validate loop stability, reference noise, tuning range, output drive, and layout performance. The principal design consideration is lifecycle risk: SI4112-BM is marked obsolete in the verified GlobalSpec result. For new production, evaluate an active replacement only after checking its frequency range, package, pinout, supply voltage, reference requirements, and RF performance. Treat distributor inventory as temporary and validate the specific lot before committing to a long-term design. This page consolidates the verified manufacturer and distributor information, explicit lifecycle status, package identity, and sourcing context. It also records missing datasheet parameters rather than inferring them, while the comparison and application notes help engineers distinguish an obsolete but documented device from an unverified substitute.
SI4112-BT - 1 GHz Dual-Band RF Synthesizer | Silicon Labs
The Silicon Labs SI4112-BT is a 1 GHz dual-band RF frequency-synthesizer IC with integrated VCOs for wireless communications, supplied in a 24-pin TSSOP package measuring 4.40 mm wide. Its headline characteristics are a 1 GHz maximum stated frequency, one RF output according to the verified distributor listing, and a 24-TSSOP surface-mount package. The SI4112-BT is intended for wireless communication systems requiring programmable high-frequency signal generation with integrated voltage-controlled oscillators. An RF synthesizer is a clock-and-timing semiconductor that generates a controlled output frequency from a reference source. In the broader hierarchy, this product is an RF frequency synthesizer, part of clock and timing ICs, and ultimately a semiconductor used to establish the carrier or local-oscillator signal in a wireless transmitter or receiver. Its integrated VCOs reduce the number of separate frequency-generation components needed in RF designs. The verified distributor information identifies the SI4112-BT as a frequency-synthesizer IC operating up to 1 GHz and packages it as 24-TSSOP, or 0.173-inch by 4.40 mm width. Search results also describe the device as a dual-band RF synthesizer with integrated VCOs for wireless communications. Detailed phase-noise, tuning-range, supply-voltage, output-power, temperature, and lock-time figures were not included in the supplied source data and should be confirmed from the manufacturer datasheet before design release. The SI4112-BT fits RF front ends, wireless transceivers, local-oscillator generation, modulation and demodulation chains, and communication equipment requiring a programmable RF reference. Integrated VCOs are particularly useful when board area and external frequency-generation complexity are priorities, although loop-filter, reference, and RF-layout requirements still need careful validation. For a new layout, preserve the 24-TSSOP footprint and verify every pin function against the applicable datasheet revision. Do not infer programming, charge-pump, reference, or supply connections from the family description alone; the supplied evidence confirms the device identity and broad frequency-synthesizer role, but not a complete electrical pin map. Validate RF trace impedance, keep the synthesizer reference path short, and test tuning and lock behavior across the intended channel plan.
SI4112-D-GT - 1 GHz Dual-Band RF Synthesizer | Skyworks
Skyworks SI4112-D-GT is a 1 GHz dual-band frequency-synthesizer IC with integrated VCOs, an IF output, and a 24-pin TSSOP package measuring 0.173 inch wide by 4.40 mm. The verified distributor listing identifies it as a PLL RF synthesizer for wireless communications, while the manufacturer describes it as a low-noise RF frequency-synthesis solution for price-sensitive, low-power personal wireless systems. A frequency synthesizer is a phase-locked-loop timing and RF component that locks a voltage-controlled oscillator to a stable reference frequency. The SI4112 family integrates the VCO circuitry and associated RF functions, reducing the need for external VCOs, varactor diodes, and passive networks. The manufacturer specifically identifies dual-band and IF synthesis as useful functions for wireless personal-communications equipment. The verified product data establishes a maximum listed frequency of 1 GHz and a single output channel. It also identifies a 24-TSSOP surface-mount package with a 0.173-inch body width and 4.40 mm overall width. Skyworks states that the integration can reduce external passive-component count, eliminate external VCOs and varactor diodes, and improve power efficiency compared with less-integrated implementations. This device belongs to the RF synthesizer hierarchy: RF frequency synthesizer → PLL → clock and timing IC → integrated circuit. Its integrated VCO architecture makes it relevant to compact wireless receivers and transmitters where board area, external component count, and power efficiency are important. The provided sources describe the part for wireless personal communications rather than high-end test equipment or precision instrumentation. Typical uses include RF down-conversion and up-conversion systems, wireless communication transceivers, and compact RF signal chains requiring programmable frequency generation. The IF output allows the synthesized signal to be used as an intermediate-frequency source in a receiver or transmitter architecture. The available verified data does not establish exact operating voltage, tuning range, phase-noise values, output power, temperature limits, or pin-level electrical limits. Designers should verify the complete manufacturer datasheet before layout or RF matching. The 24-pin TSSOP footprint requires careful high-frequency routing, controlled ground return paths, and decoupling close to the device pins. Because this is a frequency-sensitive RF component, component tolerances, reference-frequency stability, loop-filter implementation, and output matching can materially affect system performance. This page consolidates verified distributor identity, package information, manufacturer application context, pricing fields marked as data-needed, and replacement-search limitations for SI4112-D-GT. It does not invent undocumented electrical ratings or treat generic cross-reference search results as verified drop-in equivalents.
SI4112-D-GTR - 1 GHz Dual-Band RF Synthesizer | Skyworks (Tape & Reel)
Skyworks SI4112-D-GTR is a 1 GHz dual-band frequency-synthesizer IC with integrated VCOs, an IF output, and a 24-pin TSSOP package measuring 0.173 inch wide by 4.40 mm. The verified distributor listing identifies it as a PLL RF synthesizer for wireless communications, while the manufacturer describes it as a low-noise RF frequency-synthesis solution for price-sensitive, low-power personal wireless systems. A frequency synthesizer is a phase-locked-loop timing and RF component that locks a voltage-controlled oscillator to a stable reference frequency. The SI4112 family integrates the VCO circuitry and associated RF functions, reducing the need for external VCOs, varactor diodes, and passive networks. The manufacturer specifically identifies dual-band and IF synthesis as useful functions for wireless personal-communications equipment. The verified product data establishes a maximum listed frequency of 1 GHz and a single output channel. It also identifies a 24-TSSOP surface-mount package with a 0.173-inch body width and 4.40 mm overall width. Skyworks states that the integration can reduce external passive-component count, eliminate external VCOs and varactor diodes, and improve power efficiency compared with less-integrated implementations. This device belongs to the RF synthesizer hierarchy: RF frequency synthesizer → PLL → clock and timing IC → integrated circuit. Its integrated VCO architecture makes it relevant to compact wireless receivers and transmitters where board area, external component count, and power efficiency are important. The provided sources describe the part for wireless personal communications rather than high-end test equipment or precision instrumentation. Typical uses include RF down-conversion and up-conversion systems, wireless communication transceivers, and compact RF signal chains requiring programmable frequency generation. The IF output allows the synthesized signal to be used as an intermediate-frequency source in a receiver or transmitter architecture. The available verified data does not establish exact operating voltage, tuning range, phase-noise values, output power, temperature limits, or pin-level electrical limits. Designers should verify the complete manufacturer datasheet before layout or RF matching. The 24-pin TSSOP footprint requires careful high-frequency routing, controlled ground return paths, and decoupling close to the device pins. Because this is a frequency-sensitive RF component, component tolerances, reference-frequency stability, loop-filter implementation, and output matching can materially affect system performance. This page consolidates verified distributor identity, package information, manufacturer application context, pricing fields marked as data-needed, and replacement-search limitations for SI4112-D-GTR. It does not invent undocumented electrical ratings or treat generic cross-reference search results as verified drop-in equivalents.
SI4113-BT - 1.8 GHz Dual-Band RF Synthesizer | Silicon Labs
The Silicon Labs SI4113-BT is a 1.8 GHz dual-band RF frequency-synthesizer IC with integrated VCOs and RF outputs, supplied in a 24-pin TSSOP package. It operates from a 2.7 V to 3.6 V supply, provides programmable power-down modes, and draws 18 mA typical supply current while offering 1 µA standby current. The verified listing identifies the device as a frequency synthesizer with a 1:1 input-to-output ratio. A frequency synthesizer is a phase-locked-loop building block that derives or generates stable RF carrier signals from a reference frequency. In the broader semiconductor hierarchy, a frequency synthesizer is a clock-and-timing IC, a PLL-based RF synthesizer, and ultimately a semiconductor used to control wireless transmitters and receivers. The SI4113-BT integrates VCOs, loop filters, and related RF synthesis functions to reduce the external-component count required for wireless communications designs. Key verified features include integrated VCOs and loop filters, operation at 3.6 V, a maximum operating temperature of +85 °C, and a 24-TSSOP package measuring 0.173 inches, or 4.40 mm, in width. The verified distributor description identifies the part as an RF synthesizer with RF1/RF2 outputs, while another source describes a dual-band architecture and harmonic suppression of -26 dBc. These features suit RF signal-chain designs where local frequency generation, channel selection, and compact implementation are important. The SI4113-BT is intended for wireless communications equipment using RF1 and RF2 synthesis paths. Its dual-band structure can support systems requiring more than one RF output or related modulation and frequency-generation functions. Because RF synthesizers are sensitive to loop stability, reference noise, supply variation, layout coupling, and unwanted harmonics, the power supply, reference path, decoupling network, and output transmission lines require careful PCB implementation. A primary design consideration is preserving the specified 2.7 V to 3.6 V supply range and providing clean decoupling close to the power pins. Designers should also verify the selected reference frequency, divider settings, loop-filter configuration, output frequency range, and RF trace impedance against the complete manufacturer datasheet before layout release. Use controlled-impedance routing and a compact RF return path to minimize unintended reflections and coupling. This page combines verified distributor specifications, sourcing information, available cross-reference results, and practical RF design guidance. It distinguishes confirmed SI4113-BT data from specifications that require datasheet confirmation, helping engineers evaluate the synthesizer before requesting procurement support.
SI4113-D-GM - 1.8 GHz Dual-Band RF Synthesizer | Skyworks
The Skyworks Solutions SI4113-D-GM is a dual-band RF frequency-synthesizer IC with integrated VCOs for wireless communications. The supplied distributor data identifies a maximum frequency of 1.8 GHz, a 2.7 V to 3.6 V supply range, 18 mA to 27 mA current, RF1 and RF2 outputs, and a 28-pin VFQFN package with an exposed pad. It supports IF and dual-band low-noise RF frequency synthesis while reducing external passive-component requirements. A frequency synthesizer is a timing and RF signal-generation IC that combines frequency reference, phase detection, feedback-divider, voltage-controlled oscillator, and loop-filter functions into a controllable frequency-generation system. In the broader hierarchy, it belongs to clock and timing ICs, RF synthesizers, RF signal-generation devices, and wireless-communications semiconductors. Integrated VCOs reduce the need for discrete varactor diodes, external oscillators, and separate passive matching networks. The SI4113-D-GM is reported to operate across 900 MHz to 1800 MHz in one band and 750 MHz to 1500 MHz in the other. Its output power spans -14 dBm to +1 dBm, while harmonic performance is listed from -26 dBc to -20 dBc. These values make it relevant to compact wireless transmitters and receivers operating in cellular, personal-radio, and other RF communication bands. Its integrated synthesis architecture supports RF1 and RF2 outputs and is intended to isolate external interference in silicon. The 2.7 V to 3.6 V operating supply aligns with low-voltage portable RF systems. Reported current of 18 mA to 27 mA gives engineers a concrete starting point for power-budget analysis, although exact current depends on operating mode and output configuration. Typical uses include dual-band transceivers, wireless personal-communications equipment, IF synthesizers, and RF up-conversion or down-conversion chains. The component can simplify boards by consolidating frequency-generation functions, but RF layout still requires controlled impedance, short return paths, suitable grounding, and separation between sensitive synthesis nodes and radiating paths. Designers should verify the complete pinout, loop-filter guidance, reference requirements, and output-matching network in the manufacturer datasheet before layout. Supply decoupling should be placed close to the device, and the exposed pad needs the package-specific thermal and assembly treatment documented by Skyworks Solutions. The major engineering trade-off is board simplification versus careful RF routing and application-specific filter tuning. This page consolidates the verified manufacturer and distributor facts, distinguishes confirmed specifications from missing datasheet data, and provides practical replacement and selection guidance beyond a raw catalog listing. All prices and availability references use the verified retrieval date of 2026-10-22.
SI4113-D-GMR - 1.8 GHz Dual-Band RF Synthesizer | Skyworks (Tape & Reel)
The Skyworks Solutions SI4113-D-GMR is a dual-band RF frequency-synthesizer IC with integrated VCOs for wireless communications. The supplied distributor data identifies a maximum frequency of 1.8 GHz, a 2.7 V to 3.6 V supply range, 18 mA to 27 mA current, RF1 and RF2 outputs, and a 28-pin VFQFN package with an exposed pad. It supports IF and dual-band low-noise RF frequency synthesis while reducing external passive-component requirements. A frequency synthesizer is a timing and RF signal-generation IC that combines frequency reference, phase detection, feedback-divider, voltage-controlled oscillator, and loop-filter functions into a controllable frequency-generation system. In the broader hierarchy, it belongs to clock and timing ICs, RF synthesizers, RF signal-generation devices, and wireless-communications semiconductors. Integrated VCOs reduce the need for discrete varactor diodes, external oscillators, and separate passive matching networks. The SI4113-D-GMR is reported to operate across 900 MHz to 1800 MHz in one band and 750 MHz to 1500 MHz in the other. Its output power spans -14 dBm to +1 dBm, while harmonic performance is listed from -26 dBc to -20 dBc. These values make it relevant to compact wireless transmitters and receivers operating in cellular, personal-radio, and other RF communication bands. Its integrated synthesis architecture supports RF1 and RF2 outputs and is intended to isolate external interference in silicon. The 2.7 V to 3.6 V operating supply aligns with low-voltage portable RF systems. Reported current of 18 mA to 27 mA gives engineers a concrete starting point for power-budget analysis, although exact current depends on operating mode and output configuration. Typical uses include dual-band transceivers, wireless personal-communications equipment, IF synthesizers, and RF up-conversion or down-conversion chains. The component can simplify boards by consolidating frequency-generation functions, but RF layout still requires controlled impedance, short return paths, suitable grounding, and separation between sensitive synthesis nodes and radiating paths. Designers should verify the complete pinout, loop-filter guidance, reference requirements, and output-matching network in the manufacturer datasheet before layout. Supply decoupling should be placed close to the device, and the exposed pad needs the package-specific thermal and assembly treatment documented by Skyworks Solutions. The major engineering trade-off is board simplification versus careful RF routing and application-specific filter tuning. This page consolidates the verified manufacturer and distributor facts, distinguishes confirmed specifications from missing datasheet data, and provides practical replacement and selection guidance beyond a raw catalog listing. All prices and availability references use the verified retrieval date of 2026-10-22.
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.