ICS551M Clock Fanout Buffer Equivalent & Substitute Parts

Part Overview

The ICS551M is a Clock Fanout Buffer (Distribution) IC manufactured by Renesas Electronics Corporation, designed for 1:4 clock distribution at frequencies up to 160 MHz in 8-SOIC surface mount packaging. The ICS551M is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across the 1:4 fanout ratio, CMOS input/output logic levels, and 8-SOIC package form factor while meeting modern compliance standards.

Substiute Parts

ICS551M

Renesas Electronics CorporationIn Stock: 1916ICS551M Datasheet

Current PartRFQ

551MLF

Renesas Electronics CorporationIn Stock: 1174551MLF Datasheet

DirectRFQ

NB3N551DG

onsemiIn Stock: 1176NB3N551DG Datasheet

MFR RecommendedRFQ

NB3N551DR2G

onsemiIn Stock: 2324NB3N551DR2G Datasheet

MFR RecommendedRFQ

PI6C10804WE

Diodes IncorporatedIn Stock: 1892PI6C10804WE Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ICS551M are qualified based on the following criteria:

Core Functional Parameters (Required Match):

• Fanout Buffer (Distribution) type with 1:4 input:output ratio
• Non-differential input and output configuration
• 8-SOIC (0.154", 3.90mm Width) package form factor
• Surface mount mounting type
• MSL rating of 1 (Unlimited)

Allowable Parameter Variations:

• Maximum frequency: ICS551M operates at 160 MHz; substitutes may operate at higher frequencies (180 MHz) without functional impact
• Input/output logic: ICS551M specifies CMOS; substitutes may support LVCMOS or LVTTL, which are compatible logic families
• Supply voltage: ICS551M operates at 3V ~ 5.5V; substitutes with overlapping or extended voltage ranges are acceptable
• Operating temperature: ICS551M operates at 0°C ~ 70°C; substitutes with extended temperature ranges (-40°C ~ 85°C) are acceptable
• Product status and compliance: Active parts with RoHS3 compliance are preferred over obsolete parts

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 551MLF (Renesas Electronics Corporation)

The 551MLF is the direct Renesas equivalent to the ICS551M, maintaining identical electrical specifications (160 MHz maximum frequency, 3V ~ 5.5V supply voltage, 0°C ~ 70°C operating temperature) and package form factor. The 551MLF is active in production and RoHS3 compliant, addressing the obsolescence and compliance limitations of the ICS551M. This part is the preferred substitute for direct replacement in existing designs.

Secondary Substitutes: NB3N551DG and NB3N551DR2G (onsemi)

Both onsemi parts (NB3N551DG in Tube packaging and NB3N551DR2G in Tape & Reel packaging) are functionally equivalent with enhanced specifications: 180 MHz maximum frequency, extended operating temperature range (-40°C ~ 85°C), and RoHS3 compliance. These parts support LVCMOS and LVTTL input/output logic, providing broader compatibility with modern logic families. The NB3N551DR2G in Tape & Reel packaging is suitable for high-volume production environments.

Alternative Substitute: PI6C10804WE (Diodes Incorporated)

The PI6C10804WE from Diodes Incorporated meets the core functional requirements with 180 MHz frequency capability and RoHS3 compliance. However, this part specifies a supply voltage range of 1.4V ~ 2.7V, which does not overlap with the ICS551M's 3V ~ 5.5V requirement. The PI6C10804WE is discontinued at DiGi Electronics and should be considered only when the lower voltage specification aligns with system requirements.

Frequently Asked Questions (FAQ)

Q: Can the 551MLF directly replace the ICS551M without design changes?

A: Yes. The 551MLF maintains identical electrical and mechanical specifications to the ICS551M, including the same 160 MHz maximum frequency, 3V ~ 5.5V supply voltage range, 0°C ~ 70°C operating temperature, and 8-SOIC package. No design modifications are required for direct substitution.

Q: What are the advantages of using NB3N551DG or NB3N551DR2G instead of 551MLF?

A: The onsemi parts offer higher maximum frequency (180 MHz versus 160 MHz), extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C), and support for LVCMOS and LVTTL logic families in addition to CMOS. These enhancements provide greater design margin and compatibility with a broader range of logic standards. The choice between tube (NB3N551DG) and tape & reel (NB3N551DR2G) packaging depends on production volume and assembly requirements.

Q: Is the PI6C10804WE compatible with the ICS551M?

A: The PI6C10804WE is not directly compatible due to its supply voltage specification of 1.4V ~ 2.7V, which does not overlap with the ICS551M's 3V ~ 5.5V requirement. This part should only be considered if your system operates at the lower voltage range. Additionally, the PI6C10804WE is discontinued at DiGi Electronics, limiting availability.

Q: What is the significance of the 8-SOIC package specification?

A: The 8-SOIC (0.154", 3.90mm Width) package is a surface mount form factor that determines physical compatibility with printed circuit board layouts. All qualified substitutes maintain this identical package specification, ensuring mechanical compatibility without PCB redesign.

Q: Why is RoHS3 compliance important for substitute selection?

A: RoHS3 compliance indicates that the part meets current environmental and regulatory standards for hazardous substance restrictions. The ICS551M is RoHS non-compliant, while all active substitutes (551MLF, NB3N551DG, NB3N551DR2G, and PI6C10804WE) are RoHS3 compliant, ensuring compliance with modern procurement and manufacturing regulations.

Q: What packaging options are available for production?

A: The 551MLF, NB3N551DG, and PI6C10804WE are supplied in Tube packaging suitable for lower-volume or manual assembly processes. The NB3N551DR2G is supplied in Tape & Reel (TR) packaging, which is optimized for high-volume automated assembly operations.