Equivalent & Substitute Parts for 651MILFT Clock Buffer IC

Part Overview

The 651MILFT is a Clock Fanout Buffer (Distribution) IC manufactured by Renesas Electronics Corporation, designed for 1:4 clock distribution at frequencies up to 200 MHz in 8-SOIC surface mount packaging. This part is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The 651MILFT operates across a supply voltage range of 1.425V to 2.625V with an operating temperature range of -40°C to 85°C.

Key Parameters

Parameter	Specification
Manufacturer Part Number	651MILFT
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Type	Fanout Buffer (Distribution)
Ratio - Input:Output	1:4
Frequency - Max	200 MHz
Voltage - Supply	1.425V ~ 2.625V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 651MILFT is determined by the following critical parameters:

Package Compatibility: All substitute parts must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging to ensure PCB footprint compatibility
Functional Configuration: 1:4 input-to-output ratio for clock distribution functionality
Frequency Capability: Maximum frequency rating of 200 MHz or higher to support the original specification
Supply Voltage Overlap: Substitute parts must support voltage ranges that encompass or exceed the 1.425V to 2.625V requirement
Operating Temperature Range: Minimum support of -40°C to 85°C operating conditions
Signal Type Compatibility: LVCMOS or LVTTL input/output standards for logic level compatibility

The following substitute parts meet these criteria and are classified as Active products with current manufacturing availability.

Parameter Comparison

Parameter	651MILFT	651SDCGI8	NB3N551DG	NB3N551DR2G	PI6CL10804WE	PI6CL10804WEX
Manufacturer	Renesas	Renesas	onsemi	onsemi	Diodes Inc.	Diodes Inc.
Type	Fanout Buffer	Clock Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer
Ratio	1:4	1:4	1:4	1:4	1:4	1:4
Frequency - Max	200 MHz	200 MHz	180 MHz	180 MHz	200 MHz	200 MHz
Voltage - Supply	1.425V ~ 2.625V	1.71V ~ 1.89V, 2.375V ~ 2.625V, 3.135V ~ 3.465V	3V ~ 5.5V	3V ~ 5.5V	1.1V ~ 1.6V	1.1V ~ 1.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Input Signal Type	Clock	LVCMOS	LVCMOS, LVTTL	LVCMOS, LVTTL	LVCMOS	LVCMOS
Output Signal Type	Clock	LVCMOS	LVCMOS, LVTTL	LVCMOS, LVTTL	LVCMOS	LVCMOS
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Renesas 651SDCGI8: This part maintains Renesas manufacturer continuity and supports the original 200 MHz frequency specification. It provides extended operating temperature range to 105°C and offers multiple supply voltage bands including the original 2.375V to 2.625V range. Product status is Active with 6886 units in stock. Packaging is Tape & Reel (TR).

onsemi NB3N551DG and NB3N551DR2G: Both parts provide 1:4 fanout buffer functionality in 8-SOIC packaging with Active product status. Maximum frequency is 180 MHz, which is below the original 200 MHz specification. Supply voltage range is 3V to 5.5V, requiring voltage level translation if the original 1.425V to 2.625V supply is maintained. NB3N551DG is supplied in Tube packaging (1105 units in stock), while NB3N551DR2G is supplied in Tape & Reel (2269 units in stock).

Diodes Incorporated PI6CL10804WE and PI6CL10804WEX: Both parts support the full 200 MHz frequency specification and maintain LVCMOS signal compatibility. Supply voltage range is 1.1V to 1.6V, which overlaps with the lower portion of the original specification. Both are Active products with ROHS3 compliance. PI6CL10804WE is supplied in Tube packaging (1391 units in stock), while PI6CL10804WEX is supplied in Tape & Reel (5200 units in stock).

Frequently Asked Questions (FAQ)

Q: Can the 651SDCGI8 directly replace the 651MILFT?

A: The 651SDCGI8 provides direct functional replacement with identical 1:4 ratio, 200 MHz frequency capability, and 8-SOIC packaging. Both are Renesas products with ROHS3 compliance. The 651SDCGI8 supports extended temperature operation to 105°C and multiple supply voltage bands that include the original specification range.

Q: What is the frequency limitation with onsemi substitutes?

A: The NB3N551DG and NB3N551DR2G are rated for maximum 180 MHz operation, compared to the 200 MHz specification of the 651MILFT. These parts are suitable for applications operating at or below 180 MHz. Applications requiring the full 200 MHz capability should use the 651SDCGI8, PI6CL10804WE, or PI6CL10804WEX.

Q: Are voltage level adjustments required for the Diodes Incorporated substitutes?

A: The PI6CL10804WE and PI6CL10804WEX operate at 1.1V to 1.6V supply voltage, which is lower than the original 1.425V to 2.625V range. Applications using supply voltages above 1.6V require voltage regulation or level translation to interface with these parts.

Q: What packaging options are available for production quantities?

A: The 651SDCGI8 and PI6CL10804WEX are supplied in Tape & Reel (TR) packaging suitable for automated assembly. The NB3N551DG and PI6CL10804WE are supplied in Tube packaging. The NB3N551DR2G is also available in Tape & Reel format.

Q: Do all substitute parts maintain ROHS3 compliance?

A: All listed substitute parts are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited), matching the environmental compliance profile of the original 651MILFT.

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