SI52112-B4-GT 100MHz PCIe Clock Generator | Skyworks
MPN: SI52112-B4-GT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.119 | $3.12 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
SI52112-B4-GT Overview
A PCI Express clock generator is a clock-and-timing semiconductor that creates or distributes the reference clocks required by PCIe serializers, deserializers, controllers, and other digital logic. It belongs to the broader clock-generation and clock-distribution hierarchy, where accurate edge timing and low phase jitter help maintain reliable data transfer across high-speed differential links.
The verified device information identifies a 100 MHz operating or output-clock figure and an 8-TSSOP surface-mount package. Skyworks states that the Si52112-B4 family can source two PCIe clocks from a 25 MHz crystal or clock input, provides frequency flexibility, and uses configurable AC parameters for signal-integrity optimization. The supplied sources also state compliance with PCIe Gen 1, Gen 2, and Gen 3 phase-jitter requirements and availability in an industrial temperature range.
Typical uses include PCIe endpoint and root-complex clock trees, industrial computer expansion cards, embedded servers, storage controllers, network adapters, and test equipment that require a deterministic reference clock. The TSSOP package makes the device suitable for conventional surface-mount PCB assembly, while exact pin functions, electrical limits, output configuration, and crystal requirements should be taken from the manufacturer datasheet.
When laying out a PCIe clock circuit, keep the oscillator or crystal path and clock outputs short, use controlled impedance routing for downstream links, and account for clock jitter, return loss, and power-supply noise. Confirm the package variant, pinout, output enable behavior, supply requirements, and intended PCIe generation against the official Si52112-B3/B4 datasheet before releasing a production design.
Drop-in alternatives for SI52112-B4-GT — 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:
SI52112-B4-GTR
✅ Drop-In📋 Reference alternative (not in catalog)
SI52112-B3
✅ Drop-In📋 Reference alternative (not in catalog)
SI52112-A2-GT
✅ Drop-In📋 Reference alternative (not in catalog)
SI52112-B5
✅ Drop-In📋 Reference alternative (not in catalog)
SI52112-B6
✅ Drop-In📋 Reference alternative (not in catalog)
SI52112-B4-GT Specifications
| Device Type | PCI Express clock generator |
| Verified Clock Frequency | 100 MHz |
| Verified Output Count | 1 output |
| Family Output Count | 2 outputs |
| Input Reference | 25 MHz crystal or clock input |
| PCI Express Support | Gen 1, Gen 2, and Gen 3 requirements |
| Output Frequency Flexibility | Configurable |
| AC Parameters | Configurable for signal-integrity optimization |
| Package | 8-pin TSSOP |
| Mounting Type | Surface mount |
| Operating Temperature | Industrial temperature range |
| RoHS Status | RoHS compliant |
| Tube Packaging | Tube |
| Tape-and-Reel Variant | SI52112-B4-GTR |
| Reference Unit Price | 3.119 USD at quantity 1 |
SI52112-B4-GT 8-pin tssop Pin Configuration Guide
Pin configuration for SI52112-B4-GT (8-pin tssop 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 SI52112-B4-GT.
Refer to the datasheet for full pin configuration.
Typical Applications
SI52112-B4-GT is suitable for 6 applications: PCIe Endpoint Clock Tree, Industrial PCI Express Expansion Card, PCIe Root Complex Reference Clock, High-Speed Network Adapter, Embedded Storage and Compute Platform, PCIe Signal-Integrity Test Platform.
PCIe Endpoint Clock Tree
The SI52112-B4-GT is suitable for supplying a controlled reference clock to a PCI Express endpoint when the board requires a dedicated clock-generation component. Skyworks identifies the Si52112-B4 family as compliant with PCIe Gen 1, Gen 2, and Gen 3 phase-jitter requirements, while its configurable AC parameters allow optimization for the downstream receiver and trace environment. In a practical design, the device is placed near the reference-clock source and the PCIe clock routing is kept short and controlled-impedance. The exact number of active outputs, supply rails, enable controls, and pin functions must be confirmed from the official datasheet before layout.
Recommended
Industrial PCI Express Expansion Card
The SI52112-B4-GT is appropriate for industrial expansion cards that need deterministic PCIe timing under commercial or industrial operating conditions. The verified Skyworks material states that the Si52112-B4 is available in an industrial temperature range and meets Gen 1, Gen 2, and Gen 3 phase-jitter requirements with margin. Use it as the board reference-clock source, with the crystal or 25 MHz clock input positioned close to the device and the generated clocks routed away from high-current switching nodes. Validate the full system for jitter, crosstalk, return loss, and power-supply noise rather than relying only on device-level specifications.
Recommended
PCIe Root Complex Reference Clock
The SI52112-B4-GT can be evaluated for a PCIe root-complex or switching-platform clock tree where a stable reference is needed before data is transmitted over high-speed differential links. Skyworks describes the family as frequency-flexible with configurable AC parameters, which supports tailoring the clock output to the channel and receiver requirements. Place the oscillator and clock generator near the source, maintain a short ground return, and isolate the clock path from noisy regulators and digital switching currents. The manufacturer's PCIe compliance statement is a useful starting point, but system-level timing margin must be measured with the actual PCB, connectors, firmware, and load conditions.
Recommended
High-Speed Network Adapter
The SI52112-B4-GT is a candidate for network adapters and interface cards that combine PCIe links with other high-speed digital circuitry. Its stated PCIe Gen 1, Gen 2, and Gen 3 phase-jitter compliance helps establish a low-noise timing reference, while the configurable AC parameters can support signal-integrity optimization. The clock generator should have a clean local supply and short connection to the source; output routing must use the board’s controlled-impedance clock topology. Because neighboring magnetics, PHYs, memories, and switching regulators can inject noise, validate clock jitter and crosstalk after integration and keep the clock path away from those aggressors.
Recommended
Embedded Storage and Compute Platform
The SI52112-B4-GT may be used in embedded compute or storage platforms that expose PCIe interfaces and require a dedicated clock reference. The verified data supports the device’s use as a PCIe clock generator, but it does not provide complete voltage, jitter, or drive-strength data. Consequently, engineers should use the manufacturer datasheet to select the correct configuration and verify startup behavior with the intended 25 MHz crystal or external reference. Place the generator close to the clock-consuming circuits and use a low-impedance reference plane to reduce susceptibility to board-level noise. Thermal and power checks should follow the final output-loading configuration.
Recommended
PCIe Signal-Integrity Test Platform
The SI52112-B4-GT is useful in PCIe signal-integrity test equipment where repeatable reference-clock generation helps compare transmitter and receiver behavior. Skyworks highlights configurable AC parameters, allowing the clock output to be adjusted for the test fixture and measurement bandwidth. Keep the device and test points close together, provide a low-noise supply, and separate the clock path from measurement amplifiers and switching regulators. Because the supplied data does not expose complete output-impedance or amplitude tables, laboratory characterization should establish the usable drive setting. The final configuration should be documented with crystal frequency, loading, PCB revision, probe locations, and observed jitter.
Recommended
Recommended Products Summary
Engineering reference data for SI52112-B4-GT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SI52112-B4-GTR | SI52112-B3 | SI52112-A2-GT | SI52112-B5 | SI52112-B6 |
|---|---|---|---|---|---|---|
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions |
Key Differentiators
- PCIe Gen 1, Gen 2, and Gen 3 timing support (vs SI52112-B5)
- Same-family alternate ordering packaging (vs SI52112-B4-GTR)
- 25 MHz crystal or clock input architecture (vs SI52112-A2-GT)
Design Notes
Keep the 25 MHz crystal or reference-clock input, the Si52112-B4-GT, and the first clock-output vias in a compact, quiet region. Route clock signals on controlled-impedance layers with continuous reference planes and avoid crossings with high-speed data or switching-current paths. Because Skyworks describes configurable AC parameters for signal-integrity optimization, validate the selected output configuration with the actual receiver, connector, and PCB stack-up rather than relying only on nominal frequency.
Place input and output decoupling according to the manufacturer’s recommended layout, with short ground connections and minimized loop area. The supplied data identifies an 8-pin TSSOP package but does not provide the pinout or capacitor values, so do not assign pins or capacitors from memory. Confirm the package drawing, exposed-pad status, pin numbering, crystal connections, and output routing in the official Si52112-B3/B4 datasheet before fabrication.
Do not treat SI52112-B4-GT and SI52112-B4-GTR as automatically interchangeable solely because both share the family name and 8-TSSOP ordering class. The verified data distinguishes GT tube packaging from GTR tape-and-reel packaging but does not provide a complete cross-reference table. Also avoid assuming that SI52112-B3, B5, or B6 is a drop-in replacement: compare PCIe generation, output count, clock inputs, jitter, supply voltage, and every pin assignment before substitution.
The supplied data does not provide supply voltage, output-drive settings, or thermal resistance, so no power-dissipation calculation can be made without inventing inputs. During design review, determine the actual output configuration and load from the datasheet, calculate dissipation from those verified values, and confirm the TSSOP copper area and ambient-temperature budget. This is especially important if both family outputs are active in a densely populated expansion card.
Compliance Information
The supplied IC Components result states RoHS Compliant. No verified REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals statement was provided.
