SI4136-F-BT 2.5GHz RF Synthesizer | Skyworks Solutions
MPN: SI4136-F-BT ✓ ActiveSI4136-F-BT Overview
A frequency synthesizer is a clock-and-timing IC that generates a stable, programmable output frequency from a fixed reference source. Within the broader signal-chain hierarchy, the SI4136 belongs to the RF synthesizer family, combines with phase-locked-loop and voltage-controlled-oscillator technologies, and ultimately supports wireless transmitter and receiver subsystems. Its integrated VCO architecture reduces the external frequency-generation component count compared with a discrete oscillator-and-divider implementation.
The verified product listing identifies the SI4136-F-BT as a 2.5 GHz frequency synthesizer IC with one synthesis channel and a 24-TSSOP package. It also describes three integrated VCOs, loop filters, reference and VCO dividers, and phase detectors. These functions support programmable frequency generation for ISM wireless communications, where a stable reference clock can be converted into an RF carrier or intermediate-frequency signal.
The 24-pin TSSOP package is surface mount and 4.40 mm wide, allowing reuse of compact wireless-control board layouts. Compared with larger leaded frequency-synthesizer packages, the surface-mount TSSOP reduces board footprint but requires careful assembly and exposed-trace thermal management. The three-wire serial control interface also allows an embedded controller to configure divider ratios, power-down behavior, and synthesizer settings.
Typical uses include ISM wireless communications, WLAN-related radio equipment, satellite-radio signal generation, and other RF communication systems requiring a programmable local oscillator. The SI4136-F-BT can serve a transmitter channel, receiver down-conversion stage, or test and measurement equipment when a programmable RF source is required. Design evaluation must confirm the required output range, reference frequency, loop-filter configuration, channel spacing, and regulatory constraints for the target ISM band.
When implementing the device, follow the manufacturer’s recommended reference, crystal, resonator, loop-filter, and decoupling networks without substituting values based only on generic synthesizer examples. PCB layout should keep the reference and RF paths short, provide a continuous ground reference, place decoupling capacitors close to the supply pins, and route high-frequency outputs over controlled-impedance traces. The serial interface must also be compatible with the host microcontroller’s voltage levels and timing requirements.
This page consolidates the verified 2.5 GHz, 24-TSSOP, package-width, distributor, and cross-reference information with practical selection guidance, application notes, and same-family replacement analysis. It also distinguishes confirmed technical facts from parameters that require confirmation in the complete manufacturer datasheet before schematic release or production qualification.
Drop-in alternatives for SI4136-F-BT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with SI4136-F-BT (same form factor and footprint) — differing in Package, Device Type, Integrated Functions, Package Width, Control Interface.
SI4136-F-GT
✅ Drop-InContact for price
View Datasheet →SI4136-F-BM
✅ Drop-In📋 Reference alternative (not in catalog)
SI4136-F-GM
✅ Drop-InContact for price
View Datasheet →SI4136-BT
✅ Drop-InContact for price
View Datasheet →SI4136-F-BT Specifications
| Product Type | ISM RF frequency synthesizer IC |
| Maximum Stated Frequency | 2.5 GHz |
| Channel Count | 1 channel |
| Integrated VCO Count | 3 VCOs |
| Control Interface | 3-wire serial interface |
| Package | 24-TSSOP |
| Package Width | 4.40 mm |
| Mounting Type | Surface mount |
| Pin Count | 24 pins |
| Integrated Functions | Phase detectors, loop filters, reference divider, and VCO divider |
| Power-Down Programming | Programmable |
| Divider Programming | Programmable reference and VCO divider settings |
SI4136-F-BT 4.40 mm Pin Configuration Guide
Pin configuration for SI4136-F-BT (4.40 mm package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for SI4136-F-BT.
Refer to the datasheet for full pin configuration.
Typical Applications
SI4136-F-BT is suitable for 6 applications: ISM Wireless Transmitter, WLAN Radio Frequency Generation, Satellite Radio Signal Source, RF Receiver Down-Conversion, RF Test and Measurement, Industrial Wireless Control.
ISM Wireless Transmitter
The SI4136-F-BT fits an ISM wireless transmitter because it generates a programmable RF frequency from a stable reference and integrates three VCOs, phase detectors, loop filters, and dividers. Its stated maximum frequency of 2.5 GHz supports RF synthesis stages in the ISM band when the required carrier and intermediate frequencies fall within the device’s limits. The 24-TSSOP package also reduces board area compared with larger leaded synthesizers. During design, verify the reference frequency, divider ratios, loop filter, output drive, supply range, and permitted operating band. The benefit is a compact multi-block synthesizer; the engineering trade-off is that RF layout, reference isolation, and phase-noise performance remain critical.
Recommended
WLAN Radio Frequency Generation
The SI4136-F-BT is applicable to WLAN radio subsystems that require programmable local-oscillator or intermediate-frequency generation. Its integrated VCO and phase-detection architecture provides the fundamental synthesis functions in one 24-TSSOP device, while the three-wire serial interface permits configuration from the radio controller. The verified 2.5 GHz upper frequency provides useful range for 2.4 GHz-class ISM radio designs, subject to the complete datasheet’s operating limits. Engineers should verify channel spacing, reference stability, loop bandwidth, spur performance, and output buffer requirements. The compact TSSOP footprint benefits dense consumer equipment, although controlled-impedance routing and careful ground-plane design remain essential for repeatable RF performance.
Recommended
Satellite Radio Signal Source
The SI4136-F-BT can support programmable signal-generation blocks in satellite-radio equipment because it combines three VCOs with reference and VCO dividers, phase detectors, and loop filters. The confirmed 2.5 GHz maximum operating frequency allows use where the required intermediate or RF output lies below that boundary. A host controller can use the three-wire serial interface to select divider and power-down settings during channel changes. Before adoption, confirm phase noise, tuning range, lock time, temperature stability, reference requirements, and output amplitude against the receiver or exciter specification. Its integrated 24-TSSOP implementation saves board space, but loop stability and reference-noise isolation must be validated with the final component values and PCB layout.
Recommended
RF Receiver Down-Conversion
The SI4136-F-BT is suitable for generating a programmable local oscillator in an RF receiver down-conversion path. A synthesized reference can support mixer selection of the desired channel, while the integrated dividers permit programmable frequency ratios from the system reference. The device’s stated 2.5 GHz ceiling covers many 2.4 GHz ISM receiver frequencies, subject to the manufacturer’s detailed tuning and operating limits. Designers should evaluate phase noise against receiver sensitivity, confirm lock behavior over temperature, and calculate spur and channel-selection requirements. The 24-TSSOP package supports compact radio boards, while low-impedance RF routing and a clean reference supply remain necessary to avoid degrading conversion performance.
Recommended
RF Test and Measurement
The SI4136-F-BT can provide programmable local-oscillator or IF generation in RF test equipment where multiple frequencies must be selected under software control. Its integrated phase detectors, loop filters, reference and VCO dividers, and three VCOs support flexible frequency planning in a 24-TSSOP package. The stated 2.5 GHz maximum frequency is sufficient for many low- to mid-band test purposes. An automated controller can configure settings through the three-wire serial interface, while power-down programming can simplify state control. Before using it as a laboratory source, verify output power, tuning resolution, phase noise, reference sensitivity, and calibration behavior. The main benefit is integration; the main limitation is that no phase-noise or accuracy specification was available in the supplied summaries.
Recommended
Industrial Wireless Control
The SI4136-F-BT fits compact industrial wireless-control modules that require programmable RF synthesis within a 24-TSSOP footprint. Three integrated VCOs and programmable divider settings allow one silicon device to support multiple frequency plans or channels, reducing reliance on discrete oscillator components. The verified 2.5 GHz upper frequency applies to many ISM industrial wireless links, but the exact band and regulatory limits must be checked for the operating region. Industrial implementations should also verify temperature range, supply tolerance, reference aging, and electromagnetic compatibility. The compact package supports dense control hardware, although the RF output network, reference source, and loop filter must follow validated manufacturer guidance to avoid channel-dependent behavior.
Recommended
Recommended Products Summary
Engineering reference data for SI4136-F-BT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI4136-F-GT | SI4136-F-BM | SI4136-F-GM | SI4136-BT |
|---|---|---|---|---|---|
| Brand | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. | Skyworks Solutions Inc. |
| Package | TSSOP-24 | TSSOP-24 | TSSOP-24 | TSSOP-24 | TSSOP-24 |
| Product Type | ISM RF frequency synthesizer IC | ISM RF frequency synthesizer | ISM RF frequency synthesizer | ISM RF frequency synthesizer | Frequency synthesizer IC |
Key Differentiators
- Three integrated VCOs consolidate RF generation functions (vs SI4136-F-GT)
- Matches the verified SI4136-BT RF frequency class (vs SI4136-BT)
- Software-programmable divider and power-down control (vs SI4136-F-BM)
Design Notes
Route the reference input, synthesizer feedback path, RF outputs, and serial-control traces according to the manufacturer reference layout. Keep switching and high-current supply nodes away from the reference network, use a continuous ground reference beneath the 24-TSSOP, and minimize stubs on RF outputs. Because the verified evidence confirms integrated VCOs, phase detectors, loop filters, and dividers but not their exact layout tolerances, validated application guidance should take precedence over generic RF layout assumptions.
Provide a quiet, stable reference source because reference phase noise and supply variation can propagate through the synthesizer loop. Place the manufacturer-recommended bypass capacitors directly beside the appropriate supply and ground pins, observe the device’s permitted voltage range, and avoid sharing noisy supply paths with RF power amplifiers where possible. The supplied data does not state the supply-voltage range, quiescent current, or capacitor values; these must be obtained from the datasheet before schematic release.
Do not treat every SI4136 suffix as electrically identical without checking the ordering table. SI4136-F-GT, SI4136-F-BM, SI4136-F-GM, and SI4136-BT appeared in verified cross-reference results, but the available snippets do not disclose complete temperature-grade, marking, or compliance differences. Compare pinout, package, electrical limits, reference configuration, and programming procedure for the exact production ordering code before approving a substitution.
Evaluate both conducted and radiated emissions with the final reference source, loop filter, RF output network, enclosure, and switching supplies present. The SI4136-F-BT integrates oscillators and phase-detection functions, so the complete RF path can influence emissions and receiver desensitization. Confirm compliance at the system level rather than inferring it solely from the 2.5 GHz synthesizer capability or the 24-TSSOP package. Use the manufacturer’s recommended values and reference design as the baseline.
Compliance Information
The verified search results do not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. AEC-Q100 is marked not_applicable because no automotive qualification evidence was supplied and the part is presented as a general RF synthesizer.
