CDCM1804RGETG4 Equivalent & Substitute Parts

Part Overview

The CDCM1804RGETG4 is a Clock Fanout Buffer (Distribution), Divider, Multiplexer IC manufactured by Texas Instruments, designed for high-speed clock distribution applications up to 800 MHz. This device features a 1:4 input-to-output ratio with differential input and output support, housed in a 24-VFQFN Exposed Pad surface mount package.

The CDCM1804RGETG4 is currently discontinued at DiGi Electronics. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Substiute Parts

CDCM1804RGETG4

Texas InstrumentsIn Stock: 2090CDCM1804RGETG4 Datasheet

Current PartRFQ

CDCM1804RGET

Texas InstrumentsIn Stock: 1189CDCM1804RGET Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDCM1804RGETG4 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Manufacturer: Texas Instruments
• Package / Case: 24-VFQFN Exposed Pad
• Differential Input/Output: Yes/Yes
• Input Signal Types: CML, HSTL, LVDS, LVPECL, LVTTL, SSTL-2, VML
• Output Signal Types: LVCMOS, LVPECL
• Frequency - Max: 800 MHz
• Voltage - Supply: 3V ~ 3.6V
• Operating Temperature: -40°C ~ 85°C
• RoHS Status: ROHS3 Compliant

Flexible Parameter:

• Ratio - Input:Output: The CDCM1804RGETG4 specifies a 1:4 ratio. Substitute parts with different ratios (such as 1:3) may be considered if the application can accommodate fewer output channels, provided all other parameters remain identical.

The CDCM1804RGET meets all mandatory matching parameters and represents the primary substitute option, with the distinction of a 1:3 output ratio instead of 1:4.

Parameter Comparison

Engineering Selection Recommendations

The CDCM1804RGET is the qualified substitute for the discontinued CDCM1804RGETG4. Both parts share identical electrical specifications, signal compatibility, thermal operating range, and compliance certifications (ROHS3, REACH Unaffected). The CDCM1804RGET maintains active product status with confirmed inventory availability (1161 Pcs New Original In Stock).

The primary design consideration is the output ratio difference: the substitute provides 1:3 output channels versus the original 1:4 configuration. Circuit designs requiring all four output channels must be re-evaluated to operate with three channels, or alternative clock distribution solutions must be assessed.

Both parts are housed in identical 24-VQFN (4x4) surface mount packages with exposed pads, ensuring mechanical and thermal compatibility on existing PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the CDCM1804RGET directly replace the CDCM1804RGETG4 in my design?

A: The CDCM1804RGET is electrically and mechanically compatible with the CDCM1804RGETG4 in terms of package, signal types, frequency rating, supply voltage, and operating temperature. The critical difference is the output ratio: 1:3 versus 1:4. If your design uses all four output channels, the substitute will not provide the required number of outputs without circuit modification.

Q: Are there any signal integrity differences between these parts?

A: Both parts support identical input signal types (CML, HSTL, LVDS, LVPECL, LVTTL, SSTL-2, VML) and output signal types (LVCMOS, LVPECL), with the same maximum frequency specification of 800 MHz. No signal integrity degradation is introduced by substitution, provided the output ratio change is accommodated in the design.

Q: What is the impact of the 1:3 versus 1:4 ratio on my application?

A: The output ratio determines the number of clock distribution channels available. The CDCM1804RGET provides three output channels instead of four. Applications requiring four independent clock outputs must either redesign to use three channels or implement an alternative clock distribution architecture.

Q: Are the packages identical?

A: Yes. Both the CDCM1804RGETG4 and CDCM1804RGET use the 24-VQFN (4x4) surface mount package with exposed pad. PCB footprints and thermal management characteristics are identical.

Q: What is the product status difference?

A: The CDCM1804RGETG4 is discontinued at DiGi Electronics, making it unavailable for new procurement. The CDCM1804RGET is active with confirmed inventory, ensuring reliable supply chain access for production and maintenance applications.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 Compliant and REACH Unaffected, with identical Moisture Sensitivity Level (MSL) ratings of 2 (1 Year). No compliance differences exist between the two parts.