SI4123-BT - 1.8 GHz Dual-Band RF Synthesizer | Silicon Labs
MPN： SI4123-BT ✗ 停產SI4123-BT 概覽
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.
直接替換替代品，適用於 SI4123-BT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： SI4123-BT （相同外形與佔位） — 差異在於 RoHS Status, Integrated VCOs, Package, Device Type, Manufacturer.
SI4123-D-GTR
✅ 直接替換聯絡詢價
查看資料表 →SI4123-D-GT
✅ 直接替換聯絡詢價
查看資料表 →SI4123-D-GMR
✅ 直接替換聯絡詢價
查看資料表 →SI4123-BT 規格
| Device Type | Frequency synthesizer IC |
| Product Description | Dual-band RF synthesizer with integrated VCOs |
| Maximum Frequency | 1.8 GHz |
| Supply Voltage Range | 2.7 V to 3.6 V |
| Operation Voltage | 3.6 V |
| 封裝 | 24-pin TSSOP, 0.173 inch, 4.40 mm width |
| Input-to-Output Ratio | 1:2 |
| Integrated VCOs | Yes |
| Integrated Loop Filters | Yes |
| Integrated Varactors | Yes |
| Integrated Resonators | Yes |
| Minimum External Components | 2 external components |
| Power-Down Modes | Programmable |
| Standby Current | 1 uA |
| Typical Supply Current | 18 mA |
| 安裝類型 | Surface mount |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
| AEC-Q100 Status | unknown |
SI4123-BT 24-pin tssop, 0.173 inch, 4.40 mm width 腳位配置指南
SI4123-BT（24-pin tssop, 0.173 inch, 4.40 mm width 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： SI4123-BT.
請參閱 資料表 以查看完整腳位配置。
典型應用
SI4123-BT 適用於 6 應用s: Wireless RF Transceiver Frequency Generation, Compact Wireless Communication Module, Industrial RF Data Link, Battery-Powered RF Sensor Node, RF Instrumentation and Test Equipment, RF Front-End Local Oscillator.
Wireless RF Transceiver Frequency Generation
The SI4123-BT fits wireless RF transceiver modules that require an integrated local-frequency synthesizer. Its verified 1.8 GHz device classification and integrated VCOs, loop filters, varactors, and resonators help reduce the RF component count around the transceiver. The 2.7 V to 3.6 V supply range is suitable for systems designed around the stated 3.6 V operating point. The designer must confirm the exact frequency band, reference input, output level, and loop settings in the datasheet. RF layout should keep the synthesizer path short, preserve controlled impedance, and isolate it from switching and digital return currents.
推薦
Compact Wireless Communication Module
The SI4123-BT is applicable to compact wireless modules where RF functions must be integrated without increasing board area unnecessarily. The verified description states that only two external components are required because the VCOs, loop filters, varactors, and resonators are integrated. This can simplify the RF subassembly and reduce assembly steps. The tradeoff is that the integrated architecture still requires disciplined decoupling, grounding, and impedance-controlled routing. The 24-pin TSSOP package supports standard surface-mount assembly, but the complete pinout and layout recommendations must be obtained from the manufacturer documentation before release.
推薦
Industrial RF Data Link
The SI4123-BT can support frequency-generation functions in industrial RF data links when its verified frequency and supply requirements match the system plan. Its integrated synthesizer functions may help reduce discrete RF parts and board-level complexity. Industrial equipment may also impose extended-temperature, EMC, and regulatory requirements that are not specified in the supplied data; confirm these conditions before selecting the device. Keep the RF section physically separated from motors, relays, switching converters, and high-current power stages. A grounded reference and controlled supply return are particularly important when the synthesizer shares a board with industrial electronics.
推薦
Battery-Powered RF Sensor Node
The SI4123-BT may be considered for battery-powered RF sensor nodes that transmit or receive on a compatible supported band. The verified 1 uA standby current is useful for low-power state planning, while the approximately 18 mA typical supply current provides a starting point for active-state budgeting. Actual battery life depends on transmit duty cycle, output state, regulator efficiency, and RF activity. The synthesizer should be enabled only when required, and the supply should be arranged to avoid unwanted RF modulation or unwanted signal generation during standby. Confirm the exact current behavior and mode settings in the manufacturer datasheet.
推薦
RF Instrumentation and Test Equipment
The SI4123-BT can be used in RF instrumentation when the instrument requires a programmable or controlled RF frequency source and the supported operating conditions match. The integrated VCOs and passive RF elements may reduce the number of external components in the source section, while the 24-TSSOP package simplifies assembly compared with a larger RF module. Instrument designs should account for phase noise, tuning accuracy, output power, and temperature behavior; those parameters are not supplied in the verified data. Use shielded or appropriately partitioned RF layout where leakage, unwanted coupling, or measurement noise could affect results.
推薦
RF Front-End Local Oscillator
The SI4123-BT is a candidate for a local-oscillator function in an RF front end because the verified data identifies it as a dual-band RF synthesizer with integrated VCOs. Integration can shorten the distance between the synthesizer and the RF front end, potentially reducing parasitic routing effects, but the actual performance depends on the selected frequency and network. The output path should use controlled impedance, short connections, and a ground reference that avoids shared noisy return paths. Confirm whether the intended architecture requires a single-ended or differential RF connection and verify every pin before layout.
推薦
推薦產品摘要
工程參考資料，適用於 SI4123-BT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | SI4123-D-GTR | SI4123-D-GT | SI4123-D-GMR |
|---|---|---|---|---|
| Device Type | Frequency synthesizer IC | Frequency synthesizer | Frequency synthesizer | Frequency synthesizer |
| Brand | Silicon Labs | Skyworks Solutions Inc | Skyworks Solutions Inc | Skyworks Solutions Inc |
主要差異化特點
- Integrated dual-band RF synthesizer architecture (對比SI4123-D-GTR)
- Documented low-power operating points (對比SI4123-D-GT)
- Common 24-TSSOP footprint family (對比SI4123-D-GTR)
設計說明
Keep the SI4123-BT RF connections short and use controlled impedance where the circuit operates at high frequency. Route the oscillator, feedback, and reference-related nets away from switching-node traces and digital return paths. Because the verified data identifies integrated resonators and varactors, the external RF network is part of the tuning system rather than a simple power connection. Confirm the manufacturer reference layout and land pattern before release.
Provide a stable 2.7 V to 3.6 V supply and place decoupling capacitors close to the relevant supply and ground pins according to the manufacturer recommendations. The verified data gives 1 uA standby current and approximately 18 mA typical supply current, which are useful for initial power budgeting. Do not assume the typical current is a maximum; verify startup, mode-dependent current, and regulator transient behavior in the complete design.
Do not substitute a functionally similar frequency synthesizer solely because it is labeled TSSOP-24. The available comparison data confirms related SI4123-family parts but does not fully verify pin compatibility, frequency range, tuning method, output configuration, or control timing. Compare the complete manufacturer pinouts and electrical tables, then validate the RF network and calibration procedure on hardware before approving a replacement.
Use a continuous, low-impedance ground reference around the RF section and separate noisy power-converter return currents from sensitive oscillator returns. The verified description identifies only two required external components, but the exact component values are not provided. Copy the manufacturer reference values and layout exactly, then inspect the assembled board for soldering errors and unintended RF coupling during bring-up.
合規資訊
The supplied search data does not explicitly establish compliance for the exact SI4123-BT MPN. A related comparison snippet describes another SI4123-family part as RoHS compliant, but that is not transferred to SI4123-BT.
