Equivalent & Substitute Parts for 651MILF Clock Buffer IC

Part Overview

The 651MILF is a Clock/Timing IC manufactured by Renesas Electronics Corporation, classified as a Clock Fanout Buffer (Distribution) device with a 1:4 input-to-output ratio and maximum frequency of 200 MHz. This part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. The 651MILF operates across a supply voltage range of 1.425V to 2.625V and is packaged in an 8-SOIC (0.154", 3.90mm Width) surface mount configuration. With 3,463 units currently in stock, alternative parts must maintain functional equivalence across critical electrical and mechanical parameters.

Substiute Parts

651MILF

Renesas Electronics CorporationIn Stock: 3543651MILF Datasheet

Current PartRFQ

651SDCGI

Renesas Electronics CorporationIn Stock: 1099651SDCGI Datasheet

MFR RecommendedRFQ

NB3N551DG

onsemiIn Stock: 1176NB3N551DG Datasheet

MFR RecommendedRFQ

NB3N551DR2G

onsemiIn Stock: 2324NB3N551DR2G Datasheet

MFR RecommendedRFQ

PI6CL10804WE

Diodes IncorporatedIn Stock: 1493PI6CL10804WE Datasheet

MFR RecommendedRFQ

PI6CL10804WEX

Diodes IncorporatedIn Stock: 5216PI6CL10804WEX Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 651MILF requires matching across the following critical parameters:

Mandatory Matching Parameters:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Ratio - Input:Output: 1:4
• Mounting Type: Surface Mount
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• RoHS Status: ROHS3 Compliant

Functional Compatibility Parameters:

• Frequency - Max: 200 MHz or higher
• Voltage - Supply: Must accommodate or exceed the 1.425V ~ 2.625V range
• Operating Temperature: Must support -40°C ~ 85°C minimum

The substitute parts identified below meet these criteria across different manufacturers and packaging configurations, enabling direct functional replacement in clock distribution applications.

Parameter Comparison

Engineering Selection Recommendations

651SDCGI (Renesas Electronics Corporation) - Preferred Renesas alternative with active product status. Maintains 200 MHz maximum frequency and 1:4 fanout ratio. Supply voltage range of 1.71V ~ 3.465V encompasses the original 1.425V ~ 2.625V specification. Extended operating temperature range to 105°C provides additional thermal margin. Available in Tube packaging with 1,061 units in stock.

NB3N551DG and NB3N551DR2G (onsemi) - Active alternatives from onsemi with identical 1:4 fanout ratio and 8-SOIC packaging. Maximum frequency of 180 MHz is below the 200 MHz specification of the 651MILF. Supply voltage range of 3V ~ 5.5V differs significantly from the original part. These parts are suitable only for applications where 180 MHz operation is acceptable and 3V ~ 5.5V supply voltage is available. NB3N551DG available in Tube; NB3N551DR2G available in Tape & Reel with 2,269 units in stock.

PI6CL10804WE and PI6CL10804WEX (Diodes Incorporated) - Active alternatives maintaining 200 MHz maximum frequency and 1:4 fanout ratio. Supply voltage range of 1.1V ~ 1.6V is narrower than the original specification. These parts are suitable for applications operating within the 1.1V ~ 1.6V supply voltage window. PI6CL10804WE available in Tube with 1,391 units; PI6CL10804WEX available in Tape & Reel with 5,200 units in stock.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and 8-SOIC surface mount packaging, ensuring mechanical and environmental compatibility with the original 651MILF design.

Frequently Asked Questions (FAQ)

Q: Can the 651SDCGI directly replace the 651MILF in all applications?

A: The 651SDCGI maintains the same 1:4 fanout ratio, 200 MHz maximum frequency, and 8-SOIC package as the 651MILF. The supply voltage range of 1.71V ~ 3.465V overlaps with the original 1.425V ~ 2.625V specification. Direct substitution is supported for applications operating within the overlapping voltage range. The extended temperature rating to 105°C provides additional operational margin.

Q: Why do the onsemi NB3N551 parts show 180 MHz instead of 200 MHz?

A: The NB3N551DG and NB3N551DR2G are specified for 180 MHz maximum frequency, which is lower than the 651MILF's 200 MHz rating. These parts are functional substitutes only for applications where the clock distribution requirement does not exceed 180 MHz. Additionally, their supply voltage range of 3V ~ 5.5V differs from the original part's 1.425V ~ 2.625V specification.

Q: What is the difference between PI6CL10804WE and PI6CL10804WEX?

A: Both parts are identical in electrical specifications, maintaining 200 MHz frequency and 1:4 fanout ratio. The primary difference is packaging: PI6CL10804WE is supplied in Tube format, while PI6CL10804WEX is supplied in Tape & Reel (TR) format. Selection depends on production volume and assembly line requirements. Both operate within a 1.1V ~ 1.6V supply voltage range.

Q: Are all substitute parts RoHS compliant?

A: All identified substitute parts—651SDCGI, NB3N551DG, NB3N551DR2G, PI6CL10804WE, and PI6CL10804WEX—are ROHS3 compliant with MSL Level 1 rating, matching the environmental and regulatory compliance of the original 651MILF.

Q: Which substitute part has the highest inventory availability?

A: PI6CL10804WEX (Diodes Incorporated) has the highest inventory with 5,200 units in stock, followed by NB3N551DR2G (onsemi) with 2,269 units. The 651SDCGI (Renesas) has 1,061 units available.

Q: Can I use the NB3N551 parts in a 1.425V ~ 2.625V supply voltage application?

A: No. The NB3N551DG and NB3N551DR2G are specified for 3V ~ 5.5V supply voltage operation. They are not suitable for applications requiring the original 1.425V ~ 2.625V voltage range.

Q: What supply voltage range should I use for the PI6CL10804 parts?

A: The PI6CL10804WE and PI6CL10804WEX are specified for 1.1V ~ 1.6V supply voltage operation. This range is narrower than the original 651MILF specification of 1.425V ~ 2.625V. Ensure your application operates within the 1.1V ~ 1.6V window for compatibility.