Skyworks SI5351 Family (10 parts in our catalog)
The Skyworks Solutions SI5351 is a highly versatile, I2C-configurable clock generator family capable of replacing multiple crystals, oscillators, and buffers in space-constrained designs. Manufactured using a patented MultiSynth fractional divider technology, these CMOS clock generators can synthesize up to eight unique non-integer related frequencies from 2.5 kHz to 200 MHz with 0 ppm error. This family is widely utilized by embedded engineers to simplify clock trees, reduce PCB footprint, and lower BOM costs in complex digital systems.
Key Features
- Glitchless frequency changes via I2C interface
- Independent frequency synthesis on each output
- Low jitter generation with 0 ppm frequency error
- Available in three variants for different input clocking needs
- Small footprint 10-MSOP or 20-QFN packages
Sub-families
| Sub-family | Variants | Core | Max Speed | Features |
|---|---|---|---|---|
| PRECISION TIMING | ||||
| SI5351B-B02073 | 2 | CMOS Clock Generator | 200 MHz | I2C HS PREC LP |
| PRECISION PROGRAMMABLE | ||||
| SI5351C-B | 3 | MultiSynth Fractional-N | 200 MHz | VCXO I2C HS PREC |
| OTHER | ||||
| SI5351A-B-G | 1 | — | — | |
| SI5351A-B | 4 | — | — | |
Typical Use Cases
The SI5351 family is ideally suited for a broad range of embedded applications requiring multiple independent reference clocks. In consumer electronics, it serves as a central timing hub for digital cameras, gaming consoles, and printers, where it drives diverse subsystems from a single master crystal. Communication engineers frequently utilize the SI5351 in software-defined radios (SDR) and networking equipment to provide stable local oscillator signals and ethernet clocks. Its ability to generate precise frequencies makes it a staple in industrial automation for synchronizing microcontrollers and FPGAs. Furthermore, the SI5351B variant, which includes an integrated VCXO, is commonly used in phase-locked loop (PLL) systems for clock recovery and jitter attenuation in audio/video equipment. The device's low power consumption and high integration level make it a preferred choice for battery-powered instrumentation where board space and efficiency are critical design constraints.
Popular Variants
Top variants from across the family, with specs that differentiate them.
| Part Number | Sub-family | Package | Type | Input | Voltage | Number of Circuits | Ratio - Input:Output | Stock |
|---|---|---|---|---|---|---|---|---|
| SI5351A-B-GTR Tape & Reel | SI5351A-B-G | TFSOP-10 | Clock Generator | Crystal | 1.71V | 2 | 1:3 | 7,189 |
| SI5351A-B-GMR | SI5351A-B | VFQFN-20 | Clock Generator | Crystal | 1.71V | 2 | 1:8 | 8,796 |
| SI5351B-B02073-GMR | SI5351B-B02073 | VFQFN-20 | Clock Generator | Crystal | 1.71V | 2 | 1:8 | 26,103 |
| SI5351C-B-GM | SI5351C-B | VFQFN-20 | Clock Generator | Clock, Crystal | 1.71V | 1 | 2:8 | 43,264 |
| SI5351A-B-GM | SI5351A-B | VFQFN-20 | Clock Generator | Crystal | 1.71V | 2 | 1:8 | 1,224 |
| SI5351B-B02073-GM | SI5351B-B02073 | VFQFN-20 | Clock Generator | Crystal | 1.71V | 2 | 1:8 | 6,586 |
| SI5351C-B-GMR | SI5351C-B | VFQFN-20 | Clock Generator | Clock, Crystal | 1.71V | 1 | 2:8 | 6,336 |
| SI5351C-B-GM1 | SI5351C-B | VFQFN-16 | Clock Generator, V.. | Clock, Crystal | 2.25V | 1 | 2:4 | 702 |
| SI5351A-B-GT | SI5351A-B | TFSOP-10 | Clock Generator | Crystal | 1.71V | 2 | 1:3 | 15,081 |
| SI5351A-B-GM1 | SI5351A-B | VFQFN-16 | Clock Generator, V.. | Clock, Crystal | 2.25V | 1 | 1:4 | 272 |
