IDT74FCT38074DCI Clock Fanout Buffer Equivalent & Substitute Parts

Part Overview

The IDT74FCT38074DCI is a Clock Fanout Buffer (Distribution) IC manufactured by Renesas Electronics Corporation, designed for 1:4 clock distribution at frequencies up to 166 MHz. This component operates with LVTTL input and LVCMOS/LVTTL output in an 8-SOIC surface mount package.

The main part number IDT74FCT38074DCI is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and meet current compliance requirements for new production runs or system updates.

Substiute Parts

IDT74FCT38074DCI

Renesas Electronics CorporationIn Stock: 2482IDT74FCT38074DCI Datasheet

Current PartRFQ

74FCT38074DCGI

Renesas Electronics CorporationIn Stock: 389974FCT38074DCGI Datasheet

DirectRFQ

74FCT38072DCGI

Renesas Electronics CorporationIn Stock: 131774FCT38072DCGI Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the IDT74FCT38074DCI are classified into two categories based on electrical and mechanical compatibility:

Direct Substitute (Pin-Compatible, Functionally Identical): The 74FCT38074DCGI maintains identical electrical specifications and package configuration. Substitution is valid when the 1:4 fanout ratio, 166 MHz maximum frequency, LVTTL input, LVCMOS/LVTTL output, 3V–3.6V supply voltage, and 8-SOIC package are required. The primary distinction is product status and compliance certification.

Parametric Equivalent (Same Package, Modified Fanout Ratio): The 74FCT38072DCGI shares the same package, frequency rating, voltage supply, signal types, and operating temperature range. The key difference is the fanout ratio of 1:2 instead of 1:4. This part is suitable only when a 1:2 clock distribution function is acceptable within the system design.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution (1:4 Fanout Requirement): The 74FCT38074DCGI is the primary replacement for the obsolete IDT74FCT38074DCI. Both parts maintain identical electrical and mechanical specifications. The 74FCT38074DCGI offers the advantage of active product status and ROHS3 compliance, making it suitable for new designs and production environments with regulatory requirements.

For Parametric Equivalence (1:2 Fanout Acceptable): The 74FCT38072DCGI is applicable only when system architecture permits a 1:2 clock distribution instead of 1:4. All other electrical parameters, package dimensions, and compliance certifications remain equivalent. This part is also active and ROHS3 compliant.

Compliance Considerations: Both substitute parts are ROHS3 compliant and REACH unaffected, meeting modern environmental and regulatory standards. The obsolete status of the main part necessitates transition to one of the active alternatives for continued supply chain support.

Frequently Asked Questions (FAQ)

Q: Can the 74FCT38074DCGI be used as a direct replacement for IDT74FCT38074DCI? A: Yes. The 74FCT38074DCGI is electrically and mechanically identical to the IDT74FCT38074DCI. Both provide 1:4 fanout at 166 MHz with LVTTL input, LVCMOS/LVTTL output, 3V–3.6V supply, and 8-SOIC packaging. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the key difference between the 74FCT38074DCGI and 74FCT38072DCGI? A: The fanout ratio differs: 74FCT38074DCGI provides 1:4 distribution, while 74FCT38072DCGI provides 1:2 distribution. All other specifications—frequency, voltage, signal types, package, and temperature range—are identical.

Q: Can I use the 74FCT38072DCGI if my design requires 1:4 fanout? A: No. The 74FCT38072DCGI is limited to 1:2 fanout. Using it in a 1:4 application would result in insufficient output channels and system malfunction.

Q: Are there packaging differences between these parts? A: No. All three parts use the same 8-SOIC (0.154", 3.90mm Width) surface mount package. PCB layout and footprint compatibility are maintained across all variants.

Q: What is the impact of RoHS compliance on part selection? A: The 74FCT38074DCGI and 74FCT38072DCGI are both ROHS3 compliant, meeting environmental regulations for new production. The obsolete IDT74FCT38074DCI is RoHS non-compliant and should not be used in new designs subject to RoHS requirements.

Q: Are moisture sensitivity levels different among these parts? A: No. All three parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.