SI4133T-BM - 1.8 GHz Frequency Synthesizer | Silicon Labs
Référence : SI4133T-BM ✓ ActifSI4133T-BM Présentation
A frequency synthesizer is a timing and control IC that generates an output frequency from a stable reference. Within the broader semiconductor hierarchy, the SI4133T-BM is a PLL-based clock generator and frequency synthesizer, belonging to the clock and timing IC family used in RF, communications, test equipment, and digital systems. An integrated PLL and voltage-controlled oscillator can simplify frequency planning while reducing the component count required by a discrete reference, divider, loop filter, and oscillator arrangement.
The verified feature set identifies a maximum frequency of 1.8 GHz, a 2.7 V to 3 V operating supply, and an input-to-output ratio of 1:2. These parameters place the device in applications where a relatively high-frequency synthesized reference is needed without the higher supply voltage associated with many larger RF synthesizer families. The 28-VFQFN package also supports compact RF board layouts, although its exposed pad requires deliberate thermal and layout treatment.
The SI4133T-BM integrates the core frequency-synthesis function into one package. Its 1:2 ratio identifies a divided synthesis architecture, but the supplied source material does not expose the complete divider table, reference-frequency range, phase-noise values, lock-time data, or channel spacing. Those details must therefore be confirmed in the manufacturer datasheet before finalizing a PLL loop filter, reference selection, or production release.
Typical uses include RF transceiver clocking, local-oscillator generation, communications test equipment, wireless infrastructure, and embedded frequency-reference subsystems. In these systems, the 1.8 GHz ceiling provides a defined operating envelope, while the low 2.7 V to 3 V supply can simplify integration with adjacent digital or RF circuitry. The 1:2 ratio is especially relevant when the downstream block requires a related clock or intermediate frequency.
Designers should place input, output, supply, and ground connections according to the manufacturer’s reference layout, with a continuous ground plane beneath the exposed pad. Because loop bandwidth depends on phase noise, reference quality, divider settings, and filtering, the available 1.8 GHz, 1:2, and 2.7 V to 3 V specifications are not sufficient to select final capacitors or predict lock performance.
This page consolidates verified distributor attributes, pricing status, package details, and practical substitution constraints. It also distinguishes a documented same-package candidate from package-only order codes and unrelated devices, helping engineers compare alternatives without mistaking a different footprint for a true PCB drop-in replacement.
Alternatives de remplacement direct pour SI4133T-BM — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec SI4133T-BM (même facteur de forme et même empreinte) — différant par Exposed Pad.
SI4133T-GM
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →SI4133T-BM Spécifications
| Product Type | Frequency synthesizer IC |
| Manufacturer | Silicon Labs |
| Maximum Frequency | 1.8 GHz |
| Supply Voltage Range | 2.7 V to 3 V |
| Input-to-Output Ratio | 1:2 |
| Device Series | Aero |
| Boîtier | 28-VFQFN exposed pad |
| Package Dimensions | 5 mm x 5 mm |
| Type de montage | Surface mount |
| Exposed Pad | Yes |
| Circuit Type | Single circuit |
| Synchronization Category | PLL frequency synthesizer |
Guide de configuration des broches du SI4133T-BM 5 mm x 5 mm
Configuration des broches du SI4133T-BM (boîtier 5 mm x 5 mm). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour SI4133T-BM.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
SI4133T-BM convient pour 6 applications: RF Transceiver Clock Generation, Wireless Infrastructure Reference Clock, Communications Test Equipment, Local Oscillator Generation, Frequency Reference Distribution, Embedded RF Control Subsystem.
RF Transceiver Clock Generation
The SI4133T-BM fits RF transceiver clock-generation requirements that operate below its 1.8 GHz maximum output frequency and can be supplied from 2.7 V to 3 V. Its integrated frequency-synthesizer function provides a more compact alternative to a discrete reference, divider, and oscillator arrangement, while the documented 1:2 ratio can support systems that derive a related clock or intermediate-frequency signal. The 28-VFQFN exposed-pad package is appropriate for space-constrained RF boards, but thermal via placement and an uninterrupted ground plane remain critical. Before committing to the SI4133T-BM, verify reference-input range, required channel division, phase noise, lock time, and output drive against the manufacturer datasheet.
Recommandé
Wireless Infrastructure Reference Clock
The SI4133T-BM can serve as a compact synthesis element in wireless infrastructure equipment when the required output remains within the verified 1.8 GHz limit. Its 2.7 V to 3 V operating range is suited to low-voltage communications circuitry, while the 1:2 input-to-output ratio provides a defined relationship for downstream clock generation. Integrating the synthesizer in a 28-VFQFN package helps minimize board area, but RF layout quality can materially affect reference integrity and loop behavior. Use the manufacturer’s recommended ground and decoupling arrangement, preserve short supply connections, and confirm phase-noise and lock-time requirements before using the device in production baseband or radio equipment.
Recommandé
Communications Test Equipment
For communications test equipment, the SI4133T-BM provides a 1.8 GHz maximum-frequency synthesis function in a compact 5 mm by 5 mm 28-VFQFN package. This package scale is useful in modular instruments where several signal sources, dividers, and control blocks must coexist. The 2.7 V to 3 V supply range can simplify rail planning, and the 1:2 ratio may simplify generation of a related intermediate signal. Instrument designers must still validate tuning granularity, reference sensitivity, settling time, spur performance, and output amplitude because those values are not present in the verified web data. Thermal design should account for the exposed pad and local copper area.
Recommandé
Local Oscillator Generation
The SI4133T-BM is applicable to local-oscillator generation when the target frequency is covered by its documented 1.8 GHz maximum and the surrounding circuitry operates from 2.7 V to 3 V. A dedicated synthesizer IC can reduce component count compared with a discrete VCO implementation and centralize frequency control in one package. The 1:2 ratio provides a useful synthesis relationship where an offset or divided clock is required. RF engineers should preserve controlled return paths, use the recommended reference routing, and verify close-in and far-out phase noise, tuning range, lock behavior, and spur levels in the manufacturer datasheet before finalizing an LO architecture.
Recommandé
Frequency Reference Distribution
The SI4133T-BM can be considered for frequency-reference distribution where a system needs a compact synthesizer rather than a fixed clock buffer. Its 1:2 ratio establishes a clear division relationship, while the 2.7 V to 3 V supply and 1.8 GHz ceiling provide bounded design targets. The exposed-pad 28-VFQFN construction supports dense layouts but requires a low-impedance supply and ground implementation to avoid adding noise or instability to downstream timing circuits. Because the supplied records do not provide reference jitter, divider granularity, output waveform, or lock-time details, those characteristics must be checked before the SI4133T-BM is approved for precision distribution applications.
Recommandé
Embedded RF Control Subsystem
The SI4133T-BM is suitable for an embedded RF control subsystem when the board requires a compact synthesized reference and operates within the 2.7 V to 3 V supply range. Its 1.8 GHz maximum output and 1:2 ratio make it relevant to clock-planning tasks, while the 28-VFQFN package reduces footprint compared with larger leaded or TSSOP implementations. The small package does not remove the need for careful thermal engineering: the exposed pad should connect to a solid ground plane with multiple vias where the recommended layout permits. Confirm reference stability, output drive, channel spacing, startup time, and lifecycle status before committing to a production embedded-RF design.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour SI4133T-BM — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | SI4133T-GM |
|---|---|---|
| Package | 28-VFQFN exposed pad | 28-VFQFN exposed pad - same |
| Brand | Silicon Labs | Silicon Labs |
| Maximum Frequency | 1.8 GHz | 1.8 GHz device class |
Principaux différenciateurs
- Documented same-package replacement path (vs SI4133T-GM)
- Defined high-frequency ceiling (vs SI4133-BT)
- Compact exposed-pad integration (vs SI4133-BT)
Notes de conception
Follow the manufacturer land pattern and exposed-pad layout exactly. Place the device-side supply and ground connections close to their pins, use a continuous ground reference beneath the 28-VFQFN package, and add thermal vias under the exposed pad where the recommended layout permits. The 5 mm by 5 mm package has little tolerance for long current loops, so verify the final assembly and soldering process as well as the bare-board geometry.
Design the SI4133T-BM around its verified 2.7 V to 3 V supply range and confirm the permitted rail tolerance and operating conditions in the manufacturer datasheet. Use the recommended local bypass capacitors and keep the reference and synthesizer connections away from noisy switching-current paths. Because the supplied data does not state current consumption or loop-filter requirements, do not calculate or select those values from assumptions.
Do not treat the SI4133-BT as a drop-in substitute: the verified listing identifies a 24-TSSOP package rather than the target 28-VFQFN footprint. Likewise, confirm that any proposed SI4133T ordering code has the same package and that the exact model retains the required divider, reference, qualification, and temperature attributes. A similar frequency headline is not enough to establish PCB, firmware, and RF compatibility.
Informations de conformité
The supplied distributor and indexed datasheet results do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is recorded as not applicable because this is a clock and timing IC, not an automotive-qualified device claim.
