ICS551MIT Clock Fanout Buffer Equivalent & Substitute Parts

Part Overview

The ICS551MIT 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. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility through matching input/output ratios, package form factor, and operating voltage ranges while meeting current RoHS and REACH compliance standards.

Substiute Parts

ICS551MIT

Renesas Electronics CorporationIn Stock: 1170ICS551MIT Datasheet

Current PartRFQ

551MILFT

Renesas Electronics CorporationIn Stock: 120191551MILFT 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

Substitution for the ICS551MIT is determined by the following critical parameters:

• 1:4 Input:Output Ratio: All substitute parts must provide identical clock distribution capability
• 8-SOIC Package: Physical and electrical compatibility requires the same package form factor
• Supply Voltage Range: Substitute parts must operate within or encompass the 3V ~ 5.5V range
• Operating Temperature Range: -40°C ~ 85°C compatibility is required
• Non-Differential Configuration: Input and output must remain non-differential

Substitute parts are grouped into two categories:

Direct Equivalent (Same Frequency Rating):

• 551MILFT (Renesas Electronics Corporation) — Active product status, identical 160 MHz specification, RoHS3 compliant

Functional Equivalents (Higher Frequency Rating):

• NB3N551DG (onsemi) — 180 MHz rated, active product status, RoHS3 compliant
• NB3N551DR2G (onsemi) — 180 MHz rated, active product status, RoHS3 compliant
• PI6C10804WE (Diodes Incorporated) — 180 MHz rated, discontinued at DiGi Electronics, RoHS3 compliant

Higher frequency-rated parts are functionally compatible as they exceed the minimum 160 MHz requirement while maintaining all other electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): The 551MILFT is the primary substitute for the ICS551MIT. Both parts are manufactured by Renesas Electronics Corporation with identical electrical specifications (160 MHz maximum frequency, 3V ~ 5.5V supply voltage, 1:4 distribution ratio). The 551MILFT holds active product status and RoHS3 compliance, making it suitable for new designs and production continuity.

For Functional Equivalents: The onsemi NB3N551DG and NB3N551DR2G parts provide 180 MHz frequency capability, exceeding the ICS551MIT requirement. Both maintain the required 1:4 ratio, 8-SOIC package, and -40°C ~ 85°C operating range. The NB3N551DR2G is packaged in Tape & Reel format, while NB3N551DG is supplied in Tube packaging. Both are RoHS3 compliant and active products.

Voltage Supply Consideration: The PI6C10804WE from Diodes Incorporated operates at 1.4V ~ 2.7V supply voltage, which does not encompass the original 3V ~ 5.5V range. This part is not suitable for direct substitution in applications requiring the full 3V ~ 5.5V operating window. Additionally, this part is discontinued at DiGi Electronics.

Compliance Status: All recommended substitutes (551MILFT, NB3N551DG, NB3N551DR2G) are RoHS3 compliant, addressing the non-compliance status of the obsolete ICS551MIT.

Frequently Asked Questions (FAQ)

Q: Can the 551MILFT directly replace the ICS551MIT without circuit modifications? A: Yes. The 551MILFT maintains identical electrical specifications including frequency rating, supply voltage range, input/output logic levels, and package form factor. No circuit modifications are required.

Q: Are the onsemi NB3N551DG and NB3N551DR2G interchangeable with each other? A: Electrically, yes. Both parts have identical specifications. The difference is packaging: NB3N551DG is supplied in Tube format, while NB3N551DR2G is supplied in Tape & Reel format. Selection depends on production volume and handling requirements.

Q: Why is the PI6C10804WE not recommended as a substitute? A: The PI6C10804WE operates at 1.4V ~ 2.7V supply voltage, which does not overlap with the ICS551MIT's 3V ~ 5.5V range. Applications designed for 3V or 5V operation would not be compatible. Additionally, this part is discontinued at DiGi Electronics.

Q: What is the significance of the higher 180 MHz frequency rating on onsemi parts? A: The NB3N551DG and NB3N551DR2G are rated for 180 MHz maximum frequency, which exceeds the ICS551MIT's 160 MHz specification. This higher rating provides additional performance margin and is fully backward compatible with 160 MHz applications.

Q: Are all substitute parts RoHS compliant? A: The 551MILFT, NB3N551DG, and NB3N551DR2G are RoHS3 compliant. The original ICS551MIT is RoHS non-compliant. All recommended substitutes meet current RoHS requirements.

Q: Do the substitute parts maintain the same 8-SOIC package dimensions? A: Yes. All substitute parts use the 8-SOIC (0.154", 3.90mm Width) package, ensuring identical PCB footprint and mechanical compatibility.