CDC111FNR Clock Fanout Buffer Equivalent & Substitute Parts

Part Overview

The CDC111FNR is a Clock Fanout Buffer (Distribution) IC manufactured by Texas Instruments, designed for 1:9 clock distribution at 500 MHz with LVPECL input and output. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The CDC111FNR operates within a 3V to 3.6V supply range and is housed in a 28-LCC (J-Lead) package suitable for surface mount applications.

Substiute Parts

CDC111FNR

Texas InstrumentsIn Stock: 2399CDC111FNR Datasheet

Current PartRFQ

CDC111FN

Texas InstrumentsIn Stock: 2225CDC111FN Datasheet

DirectRFQ

MC100E111FNG

onsemiIn Stock: 36191MC100E111FNG Datasheet

MFR RecommendedRFQ

MC100E111FNR2G

onsemiIn Stock: 2383MC100E111FNR2G Datasheet

MFR RecommendedRFQ

MC100LVE111FNG

onsemiIn Stock: 1353MC100LVE111FNG Datasheet

MFR RecommendedRFQ

MC100LVE111FNR2G

onsemiIn Stock: 2124MC100LVE111FNR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CDC111FNR is determined by the following critical parameters: 1:9 input-to-output ratio, differential LVPECL signal compatibility, 28-LCC package footprint, and surface mount configuration. Substitute parts are grouped into two categories based on electrical performance and compliance status.

Direct Substitutes (Electrical & Mechanical Compatibility): Parts that maintain identical or superior electrical specifications while meeting modern compliance requirements. These include CDC111FN (Texas Instruments, active status) and MC100LVE111FNG / MC100LVE111FNR2G (onsemi, higher frequency capability).

Compatible Alternatives (Extended Performance): Parts that exceed the original frequency specification (800 MHz and 1.5 GHz variants) while maintaining the same package, pinout, and signal interface. These include MC100E111FNG and MC100E111FNR2G (onsemi 100E series).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): CDC111FN is the primary direct substitute, manufactured by Texas Instruments with active product status and ROHS3 compliance. This part maintains the same 500 MHz frequency specification, 3V to 3.6V supply voltage, and 28-LCC package as the CDC111FNR. The CDC111FN is suitable for applications requiring exact electrical and thermal performance matching.

For Enhanced Performance Applications: MC100LVE111FNG and MC100LVE111FNR2G (onsemi) provide 1.5 GHz maximum frequency capability while maintaining compatible 3V to 3.8V supply voltage and 28-LCC packaging. These parts support extended temperature operation (-40°C to 85°C) and ROHS3 compliance. Selection of these variants is appropriate when system design permits higher frequency operation or requires extended temperature range.

For Legacy System Compatibility: MC100E111FNG and MC100E111FNR2G (onsemi 100E series) operate at 800 MHz with 4.2V to 5.7V supply voltage. These parts require supply voltage adjustment from the original 3V to 3.6V specification and are suitable only when system power architecture supports the higher voltage range.

Compliance Considerations: All substitute parts except the original CDC111FNR meet ROHS3 compliance requirements. For new designs or production requiring regulatory compliance, CDC111FN, MC100E111FNG, MC100E111FNR2G, MC100LVE111FNG, or MC100LVE111FNR2G are appropriate selections.

Frequently Asked Questions (FAQ)

Q: Can MC100E111FNG replace CDC111FNR directly in existing designs? A: MC100E111FNG maintains the same 1:9 ratio, differential LVPECL interface, and 28-LCC package. However, it requires 4.2V to 5.7V supply voltage compared to the original 3V to 3.6V specification. Direct substitution requires power supply modification and circuit validation.

Q: What is the primary advantage of MC100LVE111FNG over CDC111FNR? A: MC100LVE111FNG supports 1.5 GHz maximum frequency (versus 500 MHz), operates across -40°C to 85°C temperature range (versus 0°C to 70°C), and maintains compatible 3V to 3.8V supply voltage. The 28-LCC package and 1:9 fanout configuration remain identical.

Q: Is CDC111FN the recommended substitute for new designs? A: CDC111FN is the direct electrical equivalent with active product status and ROHS3 compliance. It is suitable for new designs requiring 500 MHz operation and 3V to 3.6V supply voltage. For applications permitting higher frequency operation, MC100LVE111FNG or MC100LVE111FNR2G provide enhanced performance within compatible voltage and package specifications.

Q: What packaging options are available for substitute parts? A: CDC111FN is supplied in Tube packaging. MC100E111FNG is supplied in Tube. MC100E111FNR2G packaging is not specified. MC100LVE111FNG is supplied in Tube. MC100LVE111FNR2G is supplied in Tape & Reel (TR). All parts use identical 28-PLCC (11.51x11.51) footprint.

Q: Are there moisture sensitivity differences between the original and substitute parts? A: CDC111FNR has MSL 1 (Unlimited). All substitute parts have MSL 3 (168 Hours), requiring controlled storage and handling during assembly. Moisture bake-out procedures may be necessary before reflow soldering.

Q: Can MC100LVE111FNR2G be used in applications designed for CDC111FNR? A: MC100LVE111FNR2G is electrically compatible with identical 1:9 ratio, differential LVPECL interface, and 28-LCC package. Supply voltage range (3V to 3.8V) overlaps with the original specification (3V to 3.6V). Extended temperature operation (-40°C to 85°C) and higher frequency capability (1.5 GHz) provide design margin for legacy applications.