SL28PCIE25ALCT Equivalent & Substitute Parts

Part Overview

The SL28PCIE25ALCT is a PCI Express Gen3/Gen2 clock generator manufactured by Skyworks Solutions Inc., designed to provide precision timing for PCIe applications. This device operates at 100MHz with a 1:5 input-to-output ratio, delivering HCSL and LVCMOS outputs from a single clock or crystal input. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design considerations.

Substiute Parts

SL28PCIE25ALCT

Skyworks Solutions Inc.In Stock: 756SL28PCIE25ALCT Datasheet

Current PartRFQ

SI52144-A01AGMR

Skyworks Solutions Inc.In Stock: 6977SI52144-A01AGMR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SL28PCIE25ALCT is determined by the following critical parameters:

• Frequency Operation: Maximum frequency of 100MHz
• Supply Voltage Range: 3.135V ~ 3.465V compatibility
• Output Signal Types: HCSL output capability for PCIe applications
• Input Configuration: Clock or crystal input support
• PLL with Bypass: Phase-locked loop functionality
• Application Domain: PCI Express clock generation

The SI52144-A01AGMR qualifies as a functional substitute based on matching frequency, supply voltage, output type (HCSL), and PCIe application focus. However, differences in package size, output ratio, and operating temperature range must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The SI52144-A01AGMR serves as an active substitute for the obsolete SL28PCIE25ALCT in PCIe clock generation applications. Both devices share identical frequency and supply voltage specifications, ensuring core functional compatibility. The substitute offers extended operating temperature range (-40°C to 85°C versus 0°C to 85°C) and active product status with ROHS3 compliance, providing advantages for long-term availability and regulatory requirements.

Key considerations for selection:

• Package Transition: The substitute uses a smaller 24-QFN (4x4) package versus the original 32-QFN (5x5), requiring PCB layout modification.
• Output Ratio Difference: The 1:4 ratio of the substitute differs from the original 1:5 ratio; verify that output frequency requirements align with system specifications.
• Temperature Range: The substitute supports lower operating temperatures, beneficial for extended environmental conditions.
• Compliance Status: The substitute's ROHS3 compliance and active status support modern supply chain and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the SI52144-A01AGMR directly replace the SL28PCIE25ALCT without design changes?

A: Direct replacement requires PCB layout modification due to package size difference (24-QFN versus 32-QFN). Additionally, the output ratio change from 1:5 to 1:4 must be verified against system frequency requirements.

Q: What is the significance of the 1:5 versus 1:4 input-to-output ratio?

A: The ratio determines the relationship between input and output frequencies. A 1:5 ratio produces five output signals per input cycle, while 1:4 produces four. System timing requirements must accommodate this difference.

Q: Why is the substitute's operating temperature range wider?

A: The SI52144-A01AGMR supports -40°C to 85°C, compared to the original 0°C to 85°C. This extended range provides flexibility for applications requiring lower temperature operation.

Q: What does the MSL rating difference mean for handling?

A: The original part has MSL 1 (unlimited shelf life), while the substitute has MSL 2 (1-year shelf life). MSL 2 components require controlled storage conditions and have a defined moisture absorption window before soldering.

Q: Are both parts from the same manufacturer?

A: Yes, both are manufactured by Skyworks Solutions Inc., ensuring consistent design philosophy and support within the same product family.

Q: What compliance certifications apply to the substitute?

A: The SI52144-A01AGMR is ROHS3 compliant and carries EAR99 export classification, matching the original part's export status.