SI5341B-B-GM - 350MHz 10-Output Clock Generator | Skyworks
MPN: SI5341B-B-GM ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $19.0297 | $19.03 |
| 10 | $19.0297 | $190.30 |
| 100 | $19.0297 | $1,902.97 |
| 500 | $19.0297 | $9,514.85 |
| 1,000 | $19.0297 | $19,029.70 |
SI5341B-B-GM Overview
A clock generator is a timing IC that converts one or more reference sources into multiple synchronized or independently synthesized clocks. The Si5341B belongs to the PLL clock-generator hierarchy: clock generator -> frequency synthesizer -> timing and clock-management IC. This architecture reduces the number of separate oscillators and distribution components required in communications, networking, industrial, and test systems.
Principal features include 10 outputs, four reference inputs, integer and fractional synthesis modes, a 350 MHz maximum output, and 0.09 ps phase jitter. A search listing for the target order code also identifies a 1.71 V to 1.89 V supply range, while Arrow describes a 10 MHz to 750 MHz input and 350 MHz output range. These values make the device suitable for systems requiring multiple low-jitter clocks with flexible frequency relationships.
Internally, the Si5341B family combines a wide-band phase-locked loop with MultiSynth fractional-synthesis technology. Integer and fractional modes allow designers to select clock frequencies that are integer- or non-integer-related to the references. Differential outputs can support high-speed links and clock-sensitive circuitry, while the fractional capability simplifies synthesis when a conventional integer divider cannot produce the required relationship.
Typical uses include high-speed serial-interface clocking, optical transport modules, network equipment, industrial instrumentation, and semiconductor test systems. The 0.09 ps phase-jitter figure is particularly relevant where timing margin, data-eye closure, or reference-clock purity affects system performance. Engineers must still evaluate frequency-plan support, output logic levels, reference stability, and PCB thermal conditions for each specific configuration.
For layout, place the exposed-pad connection and decoupling network exactly as directed by the manufacturer reference manual. The VFQFN package relies heavily on its thermal pad for heat spreading, so via stitching and uninterrupted ground or supply copper beneath the device are important. This page combines verified source data with explicitly marked data gaps rather than inferring unverified electrical limits.
This product data adds practical interpretation of verified distributor pricing, package identity, family-level frequency synthesis, and replacement constraints. It distinguishes an orderable configuration from other Si5341B programming variants and avoids treating different frequency codes as unqualified drop-in replacements.
Drop-in alternatives for SI5341B-B-GM — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
SI5341B-D-GM
✅ Drop-In📋 Reference alternative (not in catalog)
SI5341B-B05071-GM
✅ Drop-In📋 Reference alternative (not in catalog)
SI5341B-B04226-GMR
✅ Drop-In📋 Reference alternative (not in catalog)
SI5341B-D13341-GM
✅ Drop-In📋 Reference alternative (not in catalog)
SiT95141
✅ Drop-In📋 Reference alternative (not in catalog)
SI5341B-B-GM Specifications
| Product Type | Ultra-low-jitter clock generator |
| Maximum Output Frequency | 350 MHz |
| Output Count | 10 differential outputs |
| Phase Jitter | 0.09 ps |
| Reference Input Count | 4 reference inputs |
| Frequency Synthesis Modes | Integer and fractional modes |
| Input Frequency Range | 10 MHz to 750 MHz |
| External Crystal Input Range | 25 MHz to 54 MHz |
| Differential Clock Input Range | 10 MHz to 750 MHz |
| LVCMOS Clock Input Range | 10 MHz to 250 MHz |
| Supply Voltage | 1.71 V to 1.89 V |
| Package | 64-pin VFQFN exposed pad |
| Mounting Type | Surface mount |
| Synthesis Technology | MultiSynth fractional synthesizer technology |
| PLL Architecture | Wide-band phase-locked loop |
SI5341B-B-GM 64-pin vfqfn exposed pad Pin Configuration Guide
Pin configuration for SI5341B-B-GM (64-pin vfqfn exposed pad 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 SI5341B-B-GM.
Refer to the datasheet for full pin configuration.
Typical Applications
SI5341B-B-GM is suitable for 6 applications: High-Speed Serial-Link Clocking, Optical Transport Module Timing, Network and Switching Equipment, Semiconductor Test Systems, Industrial Data Acquisition, Instrumentation and Timing Control.
High-Speed Serial-Link Clocking
The SI5341B-B-GM fits high-speed serial interfaces that need multiple low-jitter clocks derived from a controlled reference set. Its 10 differential outputs support parallel clocking, data-converter, serializer, and transceiver domains, while the 350 MHz maximum output covers many common interface rates. The 0.09 ps family phase-jitter figure helps preserve timing margin. Integer or fractional synthesis permits clock ratios that are not simple integer divisions. Before placement, verify that each required output frequency and logic standard is supported by the programmed configuration and that trace lengths and terminations follow the reference manual.
Recommended
Optical Transport Module Timing
Optical transport modules benefit from deterministic, low-jitter reference and line-side clocks. The SI5341B-B-GM can derive up to 10 differential outputs from four references, allowing shared clock distribution across transmit, receive, control, and monitoring sections. Differential reference inputs spanning 10 MHz to 750 MHz and fractional synthesis simplify adaptation to multiple line rates. Its 0.09 ps family phase jitter is relevant to high-speed signal integrity. The design must still verify output frequency, I/O voltage, reference topology, and firmware support against the exact Si5341B programming plan.
Recommended
Network and Switching Equipment
The SI5341B-B-GM is appropriate for network cards, switches, routers, and line cards that distribute several related frequencies. Four reference inputs and 10 outputs reduce clock-tree complexity, while integer and fractional synthesis allow fine control of generated frequencies. A 350 MHz maximum output supports high-speed fabric, memory, and transceiver clocking, and 0.09 ps phase jitter can improve deterministic timing margin. For each port, compare the output plan and drive level with the receiving device. Board design should isolate noisy digital and switching power paths from reference and high-speed clock traces.
Recommended
Semiconductor Test Systems
Semiconductor test systems use programmable clock generation to exercise devices across operating conditions. The SI5341B-B-GM's ten differential outputs and fractional synthesis allow multiple test clocks to be generated from shared references, while 0.09 ps phase jitter supports timing-sensitive measurements. Its four reference inputs may support redundant or multi-source synchronization. The main design consideration is validating every frequency, output format, and programming sequence before production use. Thermal layout also matters because the 64-pin VFQFN exposed pad is the primary heat-spreading path.
Recommended
Industrial Data Acquisition
Precision data-acquisition equipment can use the SI5341B-B-GM to synchronize converters, control processors, and communication blocks. Fractional synthesis avoids restricting every clock to integer ratios, while differential outputs can reduce sensitivity to common-mode noise on suitable board layouts. The family's low 0.09 ps phase jitter is advantageous when clock quality influences sampling accuracy or deterministic acquisition windows. Engineers should verify that the ADC or DAC clock limits fall below the configured 350 MHz output ceiling and that reference and output interfaces match the target acquisition IC.
Recommended
Instrumentation and Timing Control
The SI5341B-B-GM can consolidate timing for laboratory and industrial instrumentation that needs several derived clocks. Four references and ten outputs offer flexible distribution across converters, field-programmable logic, processors, and backplanes. Integer and fractional modes support both straightforward divider ratios and more complex frequency relationships, while the 0.09 ps family jitter specification targets precise timing. Validate reference stability, output termination, and cable or trace loss at the highest operating frequency. Configuration-specific programming must also be included in calibration and manufacturing test procedures.
Recommended
Recommended Products Summary
Engineering reference data for SI5341B-B-GM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI5341B-D-GM | SI5341B-B05071-GM | SI5341B-B04226-GMR | SI5341B-D13341-GM | SiT95141 |
|---|---|---|---|---|---|---|
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | SiTime |
Key Differentiators
- Broader verified family output capacity (vs SiT95141)
- Low phase jitter is explicitly quantified (vs SiT95141)
- Flexible non-integer frequency relationships (vs SiT95141)
Design Notes
Use the official Si5341/Si5340 family reference-manual footprint and pin-assignment guidance rather than a generic 64-pin QFN layout. Place decoupling capacitors at the associated supply pins with short return paths, and provide uninterrupted copper beneath the exposed pad. Confirm exposed-pad connection, antipad clearances, and via pattern against the manufacturer drawing before fabrication.
Validate every output frequency, edge rate, logic standard, trace length, and termination against the receiving device. Although the family supports differential clock inputs to 750 MHz and outputs to 350 MHz, those maxima do not remove the need for controlled impedance and topology-aware routing. Keep reference and high-speed clock traces away from switching nodes, connectors, and discontinuous return paths.
Treat the VFQFN exposed pad as the principal thermal path. Follow the manufacturer's recommended via count and pad geometry, provide solid surrounding copper where electrically permitted, and avoid placing thermal openings beneath sensitive high-speed routes. Assess temperature rise under the worst programmed-output and ambient conditions; the supplied data does not include package thermal resistance, so no dissipation value is estimated.
Do not treat every SI5341B order code as an unconditional substitute. The B-GM, D-GM, B05071-GM, B04226-GMR, and D13341-GM suffixes can represent different programmed output plans. Compare the decoded frequency map, I/O assignment, reference requirements, supply sequencing, control interface, and programming before substitution or reuse of an existing footprint.
Compliance Information
The supplied verified excerpts do not extract definitive compliance statements for the exact SI5341B-B-GM order code.
