MPC94551EF Clock Fanout Buffer Equivalent & Substitute Parts

Part Overview

The MPC94551EF 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. The MPC94551EF operates with LVCMOS input and output levels, supporting a supply voltage range of 3.135V to 3.465V across an operating temperature range of -40°C to 85°C.

Substiute Parts

MPC94551EF

Renesas Electronics CorporationIn Stock: 2171MPC94551EF Datasheet

Current PartRFQ

551MILF

Renesas Electronics CorporationIn Stock: 1695551MILF Datasheet

DirectRFQ

NB3N551DG

onsemiIn Stock: 1176NB3N551DG Datasheet

MFR RecommendedRFQ

NB3N551DR2G

onsemiIn Stock: 2324NB3N551DR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MPC94551EF is determined by the following critical parameters that must be maintained or exceeded:

Core Functional Requirements:

• Fanout Buffer (Distribution) topology with 1:4 input-to-output ratio
• 8-SOIC surface mount package (0.154", 3.90mm Width)
• Maximum frequency capability of at least 160 MHz
• Operating temperature range of -40°C to 85°C

Electrical Compatibility Criteria:

• Supply voltage range must encompass or exceed 3.135V to 3.465V
• Input and output logic levels must be compatible with LVCMOS or broader logic families (LVCMOS, LVTTL, CMOS)
• Number of circuits: 1

The substitute parts identified below meet these criteria while offering improved product status (Active) and enhanced compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

551MILF (Renesas Electronics Corporation): This part is the direct Renesas equivalent to the MPC94551EF, maintaining the same 160 MHz maximum frequency and 1:4 fanout configuration. The 551MILF offers improved product status (Active) and superior moisture sensitivity rating (MSL 1 vs. MSL 3), reducing handling and storage risks. The supply voltage range expands to 3V to 5.5V, providing greater design flexibility. Both parts are REACH Unaffected and carry EAR99 classification. The 551MILF is available in Tube packaging and represents the preferred choice for designs requiring Renesas component continuity.

NB3N551DG and NB3N551DR2G (onsemi): Both onsemi parts exceed the MPC94551EF specifications with 180 MHz maximum frequency capability, providing 20 MHz additional headroom. These parts support dual input/output logic levels (LVCMOS and LVTTL), offering broader system compatibility. The supply voltage range of 3V to 5.5V accommodates the original specification while providing extended operating margins. Both parts carry Active product status, ROHS3 compliance, and MSL 1 rating. The NB3N551DG is supplied in Tube packaging, while the NB3N551DR2G is supplied in Tape & Reel format for automated assembly. Selection between these two depends on packaging and assembly requirements.

All substitute parts maintain identical 8-SOIC package geometry, ensuring direct PCB footprint compatibility with the MPC94551EF.

Frequently Asked Questions (FAQ)

Q: Can the 551MILF directly replace the MPC94551EF in existing designs?

A: Yes. The 551MILF maintains identical functional specifications (1:4 fanout, 160 MHz maximum frequency, 8-SOIC package) and operating temperature range. The expanded supply voltage range (3V to 5.5V vs. 3.135V to 3.465V) is backward compatible. PCB layout and footprint remain unchanged.

Q: What are the advantages of using NB3N551DG or NB3N551DR2G over the 551MILF?

A: The onsemi parts provide 180 MHz maximum frequency, exceeding the original 160 MHz specification by 20 MHz. They support dual logic levels (LVCMOS and LVTTL) compared to single-level support in the 551MILF. Both offer improved moisture sensitivity (MSL 1) and ROHS3 compliance. These characteristics provide enhanced design margin and regulatory compliance.

Q: Are there packaging differences between the substitute parts?

A: Yes. The 551MILF is supplied in Tube packaging. The NB3N551DG is supplied in Tube packaging. The NB3N551DR2G is supplied in Tape & Reel format. All three maintain identical 8-SOIC (0.154", 3.90mm Width) package geometry. Packaging selection depends on assembly process requirements and volume considerations.

Q: What is the moisture sensitivity impact of switching from MPC94551EF to substitute parts?

A: The MPC94551EF carries MSL 3 (168 hours), requiring controlled storage and handling. All substitute parts carry MSL 1 (Unlimited), eliminating moisture sensitivity constraints. This reduces storage complexity and extends shelf life without special environmental controls.

Q: Are all substitute parts REACH compliant?

A: Yes. The MPC94551EF, 551MILF, NB3N551DG, and NB3N551DR2G are all REACH Unaffected, indicating no REACH-regulated substances of concern in their composition.

Q: Can I use NB3N551DG and NB3N551DR2G interchangeably?

A: Yes, from an electrical and functional perspective. Both parts are identical in specifications and performance. The difference is packaging format: NB3N551DG uses Tube packaging, while NB3N551DR2G uses Tape & Reel format. Selection depends on assembly equipment compatibility and production volume requirements.