SL28PCIE25ALC Equivalent & Substitute Parts

Part Overview

The SL28PCIE25ALC is a PCI Express (PCIe) Gen3/Gen2 clock generator manufactured by Skyworks Solutions Inc., designed for high-speed timing applications requiring precise clock distribution. This device features a 100MHz input with a 1:5 input-to-output ratio, generating HCSL and LVCMOS differential outputs in a 32-WFQFN package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

SL28PCIE25ALC

Skyworks Solutions Inc.In Stock: 975SL28PCIE25ALC Datasheet

Current PartRFQ

SI52144-A01AGM

Skyworks Solutions Inc.In Stock: 12207SI52144-A01AGM Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SL28PCIE25ALC is determined by alignment of the following critical parameters:

• Maximum frequency: 100MHz operation required
• Supply voltage range: 3.135V ~ 3.465V compatibility
• Input type: Clock or Crystal input capability
• Output type: HCSL differential output support
• Single circuit configuration
• Surface mount packaging
• PCI Express clock generation functionality
• ECCN and HTSUS classification alignment

The SI52144-A01AGM qualifies as a functional substitute based on matching maximum frequency, supply voltage range, input/output types, circuit count, and export classification. Differences in input-to-output ratio (1:4 vs. 1:5), package size (24-QFN vs. 32-QFN), and operating temperature range represent design trade-offs that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The SI52144-A01AGM presents a viable substitute for the obsolete SL28PCIE25ALC based on matching core electrical specifications and export compliance classifications. The substitute part offers the advantage of active product status, ensuring continued availability and manufacturing support. Both devices maintain identical supply voltage ranges and maximum operating frequencies, supporting direct functional replacement in PCIe clock generation applications.

The SI52144-A01AGM provides an extended operating temperature range (-40°C to 85°C versus 0°C to 85°C), offering improved performance in wider environmental conditions. The reduced input-to-output ratio (1:4 versus 1:5) and smaller package footprint (24-QFN versus 32-QFN) require circuit-level evaluation to confirm compatibility with existing board layouts and timing requirements. The substitute part supports HCSL output but does not include LVCMOS output capability; applications requiring LVCMOS output must implement alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can SI52144-A01AGM directly replace SL28PCIE25ALC without circuit modifications?

A: Direct replacement requires verification of three factors: (1) the 1:4 input-to-output ratio compatibility with system timing requirements, (2) the smaller 24-QFN package footprint compatibility with PCB layout, and (3) confirmation that HCSL output alone satisfies application needs if LVCMOS output was previously utilized.

Q: What is the significance of the different input-to-output ratios?

A: The SL28PCIE25ALC provides five output clocks from one input (1:5 ratio), while the SI52144-A01AGM provides four output clocks from one input (1:4 ratio). Applications requiring exactly five clock outputs must implement alternative solutions or external distribution logic.

Q: Does the extended operating temperature range of SI52144-A01AGM affect compatibility?

A: The SI52144-A01AGM's extended lower temperature limit (-40°C versus 0°C) represents a superset of the original part's operating range. Applications operating within the original 0°C to 85°C range experience no compatibility issues from this specification difference.

Q: Are there packaging considerations for PCB redesign?

A: Yes. The SI52144-A01AGM uses a smaller 24-QFN (4x4mm) package compared to the SL28PCIE25ALC's 32-QFN (5x5mm) package. PCB layouts must be modified to accommodate the reduced footprint and pin count differences.

Q: What export compliance applies to both parts?

A: Both the SL28PCIE25ALC and SI52144-A01AGM are classified under ECCN EAR99 and HTSUS 8542.39.0001, maintaining identical export control status.