SI4133T-GM - 1.8GHz Frequency Synthesizer | Silicon Labs
部品番号: SI4133T-GM ✗ 生産終了SI4133T-GM 概要
A frequency synthesizer is a clock-and-timing IC that derives one or more stable output frequencies from a controlled internal reference and phase-locked loop. Compared with a fixed-frequency oscillator, a synthesizer allows the operating frequency to be programmed over a defined range. Compared with a general-purpose clock generator, the SI4133T-GM is specifically categorized as a frequency synthesizer IC. Its exact architecture, reference frequency, output configuration, tuning range, phase-noise characteristics, and programming interface remain unavailable in the supplied source data.
The SI4133T-GM supports a 2.7 V to 3 V supply range and is specified for operation up to 1.8 GHz. The verified sources list one frequency-synthesizer circuit in the package. Its 28-VFQFN exposed-pad construction provides 28 package pins and an exposed thermal pad for heat transfer into the PCB. The exposed pad also requires careful land-pattern and assembly design so that thermal and electrical performance is not degraded by an inadequate ground or thermal connection.
A key engineering consideration is that the 2.7 V to 3 V operating range leaves less supply-voltage margin than many mixed-signal or legacy clock systems. A design should therefore verify that every associated digital interface, reference supply, and downstream load remains compatible with this range. The supplied evidence does not specify input or output logic thresholds, decoupling requirements, reference sensitivity, PLL loop bandwidth, lock time, or output drive capability; those values must be confirmed in the manufacturer datasheet before schematic release.
Typical design roles include local clock generation, PLL-based frequency translation, communication-module clocking, test-and-measurement clock distribution, and digital-system reference generation. In each case, the device's stated 1.8 GHz upper frequency and integrated frequency-synthesizer function make it a candidate, but selection requires confirmation of the required output count, frequency range, reference input, modulation requirements, and channel-to-channel isolation. Those application-specific parameters are not contained in the verified snippets provided for this MPN.
Designers should use the manufacturer's complete pinout and recommended land pattern rather than infer connections from the 28-pin package count. Input and output routing should be short, the exposed pad should have a full thermal-via array where recommended, and all supply bypass capacitors should be placed close to their associated pins. Because detailed decoupling values and pin functions are absent from the supplied evidence, their selection must remain open until the official datasheet is reviewed.
This product record consolidates the verified 1.8 GHz frequency-synthesizer classification, 2.7 V to 3 V supply range, single-circuit configuration, and 28-VFQFN exposed-pad package into a concise engineering reference. It also distinguishes the confirmed SI4133T-BM comparison part from unverified replacement candidates, identifies every unavailable technical parameter explicitly, and avoids treating general cross-reference tools as proof of pin-compatible equivalence.
ドロップイン代替品: SI4133T-GM — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
SI4133T-BM
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SI4133T-GM 仕様
| Device Type | Frequency synthesizer IC |
| Maximum Stated Frequency | 1.8 GHz |
| Number of Circuits | 1 |
| Supply Voltage Range | 2.7 V to 3 V |
| Package Type | 28-VFQFN exposed pad |
| Package Dimensions | 5 mm x 5 mm |
| ピン数 | 28 |
| 実装スタイル | Surface mount |
| Exposed Pad | Present |
| カテゴリ | Clock generators, PLLs, frequency synthesizers |
SI4133T-GM 5 mm x 5 mm ピン配置ガイド
SI4133T-GM (5 mm x 5 mm パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: SI4133T-GM.
詳細は データシート をご参照ください。
主な用途
SI4133T-GM の用途: 6 件s: Communication Module Clock Generation, PLL-Based Clock Translation, Test and Measurement Clocking, Digital Processor Reference Clock, RF and Microwave Subsystem Clocking, Industrial Embedded Clocking.
Communication Module Clock Generation
The SI4133T-GM is a candidate for generating a controlled clock in a low-voltage communication module because the verified data identifies it as a frequency synthesizer with operation up to 1.8 GHz and a 2.7 V to 3 V supply range. Its single frequency-synthesizer circuit could support transceiver, receiver, or digital-interface clocking where the required frequency falls within the device's complete output range. Before selection, the designer must confirm output count, tuning range, reference frequency, phase noise, spur performance, and lock time from the manufacturer datasheet. The 28-VFQFN exposed-pad package also requires a manufacturer-approved PCB land pattern and adequate thermal-via implementation.
おすすめ
PLL-Based Clock Translation
The SI4133T-GM fits applications requiring PLL-based frequency translation when the system uses a single frequency-synthesizer IC with an operating frequency specified to 1.8 GHz. Its verified 2.7 V to 3 V supply range suits low-voltage digital clocking systems, while the single-circuit package can simplify board allocation compared with a multi-channel clock generator. The supplied sources do not reveal whether the output is integer- or fractional-N, the valid reference frequencies, tuning resolution, PLL bandwidth, or lock-time behavior. Those characteristics determine whether the part can translate a particular reference into a required carrier, sampling, or service clock and must be confirmed before implementation.
おすすめ
Test and Measurement Clocking
The SI4133T-GM can be evaluated for clock generation in compact test and measurement systems requiring a programmable frequency source up to 1.8 GHz. Its frequency-synthesizer classification provides the appropriate functional category, and the 5 mm by 5 mm 28-VFQFN exposed-pad package supports compact board layouts. The verified data does not establish phase noise, tuning resolution, output amplitude, spur levels, reference sensitivity, or calibration behavior, all of which are important for instrumentation. Consequently, engineers should treat this as a preliminary candidate and compare the manufacturer performance curves against the measurement floor before using it for signal-generation or trigger-clock applications.
おすすめ
Digital Processor Reference Clock
The SI4133T-GM is potentially suitable for a digital processor or controller reference-clock requirement when the system operates from 2.7 V to 3 V and needs synthesis near the device's stated 1.8 GHz operating frequency. The single-circuit implementation may reduce board space compared with a multi-output clock generator, and the exposed-pad package permits heat transfer into the PCB. However, the supplied sources do not specify logic-level compatibility, jitter, reference-input format, output-drive strength, or programming method. The design must confirm that the clock amplitude and jitter meet the processor interface requirement and that the synthesizer can be configured using the supported control interface before selecting this device.
おすすめ
RF and Microwave Subsystem Clocking
The SI4133T-GM can be assessed for local reference or service-clock generation inside an RF or microwave subsystem because it is a frequency synthesizer with a stated operating frequency of up to 1.8 GHz. Its compact 5 mm by 5 mm VFQFN package can help preserve board area around RF components, and the 2.7 V to 3 V operating range can align with low-voltage mixed-signal systems. RF suitability nevertheless depends on phase noise, close-in and far-out spurs, reference isolation, tuning accuracy, and output drive, none of which are available in the verified excerpts. Those characteristics must be checked against the receiver or transmitter phase-noise budget before the part is approved.
おすすめ
Industrial Embedded Clocking
The SI4133T-GM is a candidate for an industrial embedded system that requires a compact synthesized clock and operates on a 2.7 V to 3 V rail. The single-circuit frequency-synthesizer configuration and 28-VFQFN exposed-pad package are well suited to space-constrained control boards, although the actual suitability depends on the required output frequency and industrial temperature limits. Those operating details, along with output count, reference requirements, PLL stability, and digital control compatibility, are absent from the supplied source data. The engineer should verify them in the manufacturer datasheet and confirm the exposed-pad thermal design against the enclosure temperature and available PCB copper.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: SI4133T-GM — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | SI4133T-BM |
|---|---|---|
| Brand | Silicon Labs | Silicon Labs |
| Package | 28-VFQFN exposed pad, 5 mm x 5 mm | 28-VFQFN exposed pad, 5 mm x 5 mm |
| Device Type | Frequency synthesizer IC | Clock generator / frequency synthesizer |
| Number of Circuits | 1 | 1 |
| Supply Voltage Range | 2.7 V to 3 V | 2.7 V to 3 V |
| Number of Pins | 28 | 28 |
| Mounting Style | Surface mount | Surface mount |
主な差別化要因
- Verified package compatibility （vs SI4133T-BM)
- Confirmed shared supply range （vs SI4133T-BM)
- Single-circuit implementation （vs SI4133T-BM)
設計ノート
Use the SI4133T-GM manufacturer land pattern and provide the exposed pad with the recommended thermal-via arrangement. The verified package is a 28-VFQFN with an exposed pad in a 5 mm by 5 mm body, but the supplied data does not include pad dimensions, via counts, or thermal resistance. Do not infer the pad's electrical net from package type alone; confirm its connection in the official pin table. Adequate copper spreading and vias are particularly important when operating continuously near the stated 1.8 GHz frequency.
Keep the reference, feedback, control, and clock-output routing compact and route outputs away from sensitive analog nodes where possible. Although the supplied excerpts do not provide specific decoupling values, any production design should follow the manufacturer guidance for input and output bypass capacitors and place them adjacent to the relevant pins. Pay particular attention to ground-return continuity under the exposed pad. A generic 28-pin QFN footprint must not be substituted without checking land dimensions, exposed-pad geometry, and paste-mask recommendations.
Do not treat the package similarity between SI4133T-GM and SI4133T-BM as proof of complete interchangeability. The verified comparison confirms the same 28-pin VFQFN format, one circuit, and 2.7 V to 3 V supply range, but it does not provide pin assignments or PLL differences. Before substitution, compare every signal, power pin, control interface, output frequency range, reference requirement, and register definition from the official datasheets. Unverified changes can cause an apparently drop-in component to prevent clock lock or produce invalid outputs.
Validate the synthesized clock at the far end of the PCB rather than relying only on the device's stated maximum frequency of 1.8 GHz. The supplied data does not include output amplitude, jitter, phase noise, rise and fall times, or drive capability, so the receiver's timing budget cannot yet be closed. Use the manufacturer characterization curves and receiver requirements to determine acceptable loading, trace length, termination, and isolation. Consider clock jitter and reference noise together because either can limit the useful performance of a nominally correct synthesized frequency.
コンプライアンス情報
The supplied distributor and manufacturer-page excerpts do not provide verified RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statements. These fields therefore remain unknown rather than being inferred.
