Renesas Electronics 651MLF Clock Buffer IC - Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 651MLF is a Clock Fanout Buffer (Distribution) IC with 1:4 ratio and 200 MHz maximum frequency, housed in an 8-SOIC package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production requirements. The 651MLF operates across a supply voltage range of 1.425V to 2.625V and is suitable for surface mount applications requiring clock distribution in low-voltage environments.

Key Parameters

Parameter	Value
Manufacturer Part Number	651MLF
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	0°C ~ 70°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 of the 651MLF is determined by the following critical parameters: 1:4 input-to-output ratio, 8-SOIC package footprint, surface mount mounting type, and maximum frequency capability. The substitute parts are grouped into two categories based on voltage supply compatibility and frequency specifications:

Category 1: Direct Voltage Range Substitutes (1.1V ~ 3.465V Supply)

651SDCGI (Renesas Electronics) - Active status, extended temperature range, compatible supply voltage envelope
PI6CL10804WE and PI6CL10804WEX (Diodes Incorporated) - Active status, 200 MHz frequency match, lower voltage supply range (1.1V ~ 1.6V)

Category 2: Higher Voltage Substitutes (3V ~ 5.5V Supply)

NB3N551DG and NB3N551DR2G (onsemi) - Active status, 180 MHz frequency, standard logic voltage levels

All substitute parts maintain the 1:4 ratio, 8-SOIC package, and surface mount configuration. Frequency and voltage supply ranges differ and must be evaluated against specific application requirements.

Parameter Comparison

Parameter	651MLF	651SDCGI	NB3N551DG	NB3N551DR2G	PI6CL10804WE	PI6CL10804WEX
Manufacturer	Renesas	Renesas	onsemi	onsemi	Diodes Inc.	Diodes Inc.
Type	Fanout Buffer	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 ~ 3.465V	3V ~ 5.5V	3V ~ 5.5V	1.1V ~ 1.6V	1.1V ~ 1.6V
Operating Temperature	0°C ~ 70°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
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

Selection of substitute parts for the obsolete 651MLF must be based on application-specific voltage supply requirements and frequency specifications:

For applications operating within 1.71V to 2.625V supply range: The 651SDCGI offers the closest functional match as a Renesas Electronics product with identical 1:4 ratio and 200 MHz frequency capability. This part extends the operating temperature range to -40°C to 105°C and maintains ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

For applications requiring 200 MHz frequency with ultra-low voltage supply (1.1V to 1.6V): The PI6CL10804WE and PI6CL10804WEX from Diodes Incorporated provide frequency parity with the 651MLF. Both parts are active products with ROHS3 compliance. PI6CL10804WEX is available in Tape & Reel packaging with higher inventory availability (5200 units).

For applications operating at standard logic voltage levels (3V to 5.5V): The NB3N551DG and NB3N551DR2G from onsemi are active alternatives. These parts operate at 180 MHz maximum frequency, which is 20 MHz below the 651MLF specification. NB3N551DR2G is supplied in Tape & Reel format with higher inventory (2269 units).

All substitute parts maintain identical 8-SOIC package footprint, surface mount configuration, and ROHS3 compliance status. Selection should prioritize supply voltage compatibility with the target application circuit.

Frequently Asked Questions (FAQ)

Q: Can the 651SDCGI directly replace the 651MLF in all applications? A: The 651SDCGI maintains the same 1:4 ratio, 200 MHz frequency, and 8-SOIC package as the 651MLF. However, the supply voltage range differs: 651SDCGI operates from 1.71V to 3.465V, while the 651MLF operates from 1.425V to 2.625V. Applications requiring operation below 1.71V supply voltage cannot use the 651SDCGI.

Q: What is the frequency difference between the 651MLF and the NB3N551 series? A: The 651MLF and PI6CL10804 series support 200 MHz maximum frequency. The NB3N551DG and NB3N551DR2G support 180 MHz maximum frequency. Applications requiring frequencies above 180 MHz must use parts rated for 200 MHz operation.

Q: Are all substitute parts available in the same packaging options? A: No. The 651MLF was supplied in standard tube packaging. Substitute parts are available in different packaging formats: 651SDCGI (Tube), NB3N551DG (Tube), NB3N551DR2G (Tape & Reel), PI6CL10804WE (Tube), and PI6CL10804WEX (Tape & Reel). Packaging selection affects lead times and handling requirements.

Q: Do all substitute parts meet the same environmental compliance standards? A: Yes. All substitute parts listed are ROHS3 compliant, REACH unaffected, and classified as MSL 1 (Unlimited moisture sensitivity level). All parts carry EAR99 export classification and HTSUS code 8542.39.0001.

Q: Which substitute part has the widest operating temperature range? A: The 651SDCGI operates from -40°C to 105°C, providing the widest temperature range among all substitutes. The 651MLF operates from 0°C to 70°C. Other substitutes (NB3N551 series and PI6CL10804 series) operate from -40°C to 85°C.

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