ICS651M Clock Fanout Buffer Equivalent & Substitute Parts

Part Overview

The ICS651M 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 equivalent substitutes necessary for new designs and ongoing production requirements. The ICS651M operates across a supply voltage range of 1.425V to 2.625V and supports operating temperatures from 0°C to 70°C.

Key Parameters

Parameter	Value
Part Number	ICS651M
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	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the ICS651M is determined by the following critical parameters: 1:4 input-to-output ratio, 8-SOIC surface mount package, maximum frequency capability, supply voltage compatibility, and operating temperature range. The ICS651M operates at 200 MHz with a supply voltage window of 1.425V to 2.625V and temperature range of 0°C to 70°C.

Substitute parts must maintain the same 1:4 fanout ratio, identical 8-SOIC package footprint, and support clock distribution functionality. Frequency capability must meet or exceed 200 MHz. Supply voltage ranges and operating temperature specifications are evaluated for application compatibility based on the design requirements.

Three qualified substitutes are identified:

PI6C10804WE (Diodes Incorporated): 1:4 fanout buffer at 180 MHz, supply voltage 1.4V to 2.7V, operating temperature -40°C to 85°C, 8-SOIC package, ROHS3 compliant, discontinued at DiGi Electronics.

PI6CL10804WE (Diodes Incorporated): 1:4 fanout buffer at 200 MHz, supply voltage 1.1V to 1.6V, operating temperature -40°C to 85°C, 8-SOIC package, ROHS3 compliant, active product status.

PI6CL10804WEX (Diodes Incorporated): 1:4 fanout buffer at 200 MHz, supply voltage 1.1V to 1.6V, operating temperature -40°C to 85°C, 8-SOIC package, ROHS3 compliant, active product status, tape & reel packaging.

Parameter Comparison

Parameter	ICS651M	PI6C10804WE	PI6CL10804WE	PI6CL10804WEX
Manufacturer	Renesas Electronics	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Type	Fanout Buffer	Fanout Buffer	Fanout Buffer	Fanout Buffer
Ratio - Input:Output	1:4	1:4	1:4	1:4
Frequency - Max	200 MHz	180 MHz	200 MHz	200 MHz
Voltage - Supply	1.425V ~ 2.625V	1.4V ~ 2.7V	1.1V ~ 1.6V	1.1V ~ 1.6V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Discontinued at DiGi Electronics	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

PI6CL10804WE and PI6CL10804WEX are the primary substitutes for new designs. Both parts are active products with ROHS3 compliance, matching the ICS651M's 200 MHz frequency specification and 1:4 fanout ratio. The supply voltage range of 1.1V to 1.6V is narrower than the ICS651M but covers the lower portion of the original specification window. Operating temperature range extends to -40°C to 85°C, providing broader environmental coverage than the original 0°C to 70°C specification. PI6CL10804WEX is supplied in tape & reel packaging, suitable for high-volume production. PI6CL10804WE is supplied in tube packaging.

PI6C10804WE is a secondary option with ROHS3 compliance and extended operating temperature range. The maximum frequency of 180 MHz is below the ICS651M specification and may not be suitable for applications requiring the full 200 MHz capability. This part is discontinued at DiGi Electronics, limiting long-term availability.

All three substitutes maintain identical 8-SOIC package footprints, enabling direct PCB layout compatibility with the original ICS651M design.

Frequently Asked Questions (FAQ)

Q: Can PI6C10804WE replace ICS651M in all applications?

A: PI6C10804WE maintains the 1:4 fanout ratio and 8-SOIC package compatibility. However, the maximum frequency is 180 MHz compared to the ICS651M's 200 MHz specification. Applications operating at frequencies above 180 MHz require PI6CL10804WE or PI6CL10804WEX.

Q: What is the difference between PI6CL10804WE and PI6CL10804WEX?

A: Both parts are electrically identical with 200 MHz maximum frequency, 1:4 fanout ratio, and identical supply voltage and temperature specifications. The primary difference is packaging: PI6CL10804WE is supplied in tube packaging, while PI6CL10804WEX is supplied in tape & reel format for automated assembly processes.

Q: Are the substitute parts pin-compatible with ICS651M?

A: All substitute parts use the 8-SOIC package with identical 0.154" width and 3.90mm body dimensions. Pin compatibility must be verified against the specific pinout documentation for each part, as fanout buffer configurations may vary.

Q: Does the narrower supply voltage range of PI6CL10804WE affect compatibility?

A: PI6CL10804WE operates from 1.1V to 1.6V, which is narrower than the ICS651M's 1.425V to 2.625V range. Applications operating within the 1.1V to 1.6V window are fully compatible. Applications requiring operation above 1.6V or below 1.1V require PI6C10804WE or design modification.

Q: What is the RoHS compliance status of the substitutes?

A: PI6C10804WE, PI6CL10804WE, and PI6CL10804WEX are all ROHS3 compliant, meeting current environmental and regulatory requirements. The original ICS651M is RoHS non-compliant.

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