FS6128-04G-XTP PLL Clock Generator Equivalent & Substitute Parts

Part Overview

The FS6128-04G-XTP is a PLL Clock Generator IC manufactured by onsemi, designed for 27MHz crystal input applications in 8-SOIC surface mount packaging. This component generates clock signals with a 1:1 input-to-output ratio and operates across a 3V to 3.6V supply voltage range. The part is currently classified as obsolete, making identification of functionally compatible alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	FS6128-04G-XTP
Manufacturer	onsemi
Category	Clock/Timing
Type	PLL Clock Generator
Package / Case	8-SOIC (0.154", 3.90mm Width)
Frequency - Max	27MHz
Voltage - Supply	3V ~ 3.6V
Input Type	Crystal
Output Type	Clock
Ratio - Input:Output	1:1
Number of Circuits	1
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	2 (1 Year)

Substitute Part Grouping Explanation

Substitution of the FS6128-04G-XTP is determined by the following critical parameters:

Manufacturer Compatibility: onsemi family devices maintain consistent pinout and functional architecture within the PLL Clock Generator product line
Package Type: Both 8-SOIC and 16-SOIC packages share the same 0.154" width and surface mount technology, enabling PCB-level compatibility with layout adjustments
Supply Voltage Range: The substitute must operate within or encompass the 3V to 3.6V requirement of the original design
Input/Output Characteristics: Crystal input and clock/CMOS output types are functionally interchangeable within the onsemi PLL generator family
Operating Temperature Range: Minimum 0°C to 70°C coverage is required for direct substitution
Frequency Capability: The substitute must support the maximum frequency requirements of the application

The FS6377-01G-XTP qualifies as a substitute based on these parameters, despite differences in package pin count and maximum frequency rating.

Parameter Comparison

Parameter	FS6128-04G-XTP	FS6377-01G-XTP	Compatibility Notes
Manufacturer	onsemi	onsemi	Same manufacturer ensures consistent design standards
Category	Clock/Timing	Clock/Timing	Identical functional category
Type	PLL Clock Generator	PLL Clock Generator	Same device type and architecture
Package / Case	8-SOIC (0.154", 3.90mm Width)	16-SOIC (0.154", 3.90mm Width)	Different pin counts; same body width enables PCB adaptation
Frequency - Max	27MHz	230MHz	Substitute supports higher frequency; backward compatible for lower frequency applications
Voltage - Supply	3V ~ 3.6V	3V ~ 5.5V	Substitute range encompasses original specification
Input Type	Crystal	Crystal	Identical input interface
Output Type	Clock	CMOS	CMOS output is compatible with clock-level signaling requirements
Ratio - Input:Output	1:1	1:4	Different multiplication ratios; application-dependent compatibility
Number of Circuits	1	1	Single circuit configuration in both devices
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	Identical temperature range
Mounting Type	Surface Mount	Surface Mount	Same mounting technology
Product Status	Obsolete	Active	Substitute is actively manufactured and supported
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	Identical moisture handling requirements

Engineering Selection Recommendations

Product Status Consideration: The FS6128-04G-XTP is obsolete, while the FS6377-01G-XTP is active. For new designs or long-term production support, the FS6377-01G-XTP is the appropriate selection.

Compliance and Certifications: Both devices carry identical REACH Unaffected and EAR99 ECCN classifications. The FS6377-01G-XTP includes RoHS3 Compliant certification, providing enhanced environmental compliance for regulated applications.

Supply Voltage Compatibility: The FS6377-01G-XTP operates across 3V to 5.5V, fully encompassing the FS6128-04G-XTP specification of 3V to 3.6V. This extended range provides design flexibility without compromising the original voltage requirements.

Package and Pinout Considerations: The transition from 8-SOIC to 16-SOIC requires PCB layout modification. The identical 0.154" body width simplifies mechanical integration, though pin assignment verification is necessary during design adaptation.

Frequency and Ratio Differences: The FS6377-01G-XTP supports 230MHz maximum frequency and a 1:4 input-to-output ratio, compared to the FS6128-04G-XTP's 27MHz and 1:1 ratio. Application-specific frequency and multiplication requirements must be evaluated to confirm functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can the FS6377-01G-XTP directly replace the FS6128-04G-XTP without PCB modifications?

A: No. The FS6377-01G-XTP uses 16-SOIC packaging versus the 8-SOIC of the original part. Pin count and assignment differ, requiring PCB layout changes. However, the identical 0.154" body width simplifies mechanical adaptation.

Q: What is the primary reason for substitution?

A: The FS6128-04G-XTP is obsolete. The FS6377-01G-XTP is an active product from the same manufacturer, ensuring continued availability and manufacturing support.

Q: Are the supply voltage ranges compatible?

A: Yes. The FS6377-01G-XTP operates across 3V to 5.5V, which fully encompasses the FS6128-04G-XTP requirement of 3V to 3.6V. No power supply modifications are necessary.

Q: How do the frequency specifications differ?

A: The FS6128-04G-XTP supports up to 27MHz, while the FS6377-01G-XTP supports up to 230MHz. The substitute is capable of higher frequency operation and is backward compatible with lower frequency applications.

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

A: The ratio determines the multiplication factor between input and output frequencies. The FS6128-04G-XTP provides 1:1 (no multiplication), while the FS6377-01G-XTP provides 1:4 (4x multiplication). Application requirements determine whether this difference affects compatibility.

Q: Are moisture sensitivity levels the same?

A: Yes. Both devices carry MSL 2 (1 Year) classification, requiring identical handling and storage protocols.

Q: Does the FS6377-01G-XTP have better environmental compliance?

A: Yes. The FS6377-01G-XTP is RoHS3 Compliant, while the FS6128-04G-XTP status is not specified. Both share REACH Unaffected and EAR99 ECCN classifications.

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