CDCM1804RTHR Equivalent & Substitute Parts

Part Overview

The CDCM1804RTHR is a Clock Fanout Buffer (Distribution), Divider, Multiplexer IC manufactured by Texas Instruments. This device functions as a 1:4 clock distribution buffer with a maximum frequency of 800 MHz, designed for high-speed timing applications requiring signal fanout and distribution across multiple output channels. The part is currently classified as Obsolete, making identification of active equivalent alternatives essential for new designs and ongoing production support.

Substiute Parts

CDCM1804RTHR

Texas InstrumentsIn Stock: 1472CDCM1804RTHR Datasheet

Current PartRFQ

CDCM1804RGER

Texas InstrumentsIn Stock: 2481CDCM1804RGER Datasheet

Parametric EquivalentRFQ

CDCM1804RGET

Texas InstrumentsIn Stock: 1189CDCM1804RGET Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CDCM1804RTHR is determined by strict alignment of the following critical parameters:

• Base Product Number: All substitutes must share the CDCM1804 base designation
• Package / Case: 24-VFQFN Exposed Pad (identical physical footprint and pin configuration)
• Supplier Device Package: 24-VQFN (4x4) (ensures PCB compatibility)
• Frequency - Max: 800 MHz (maintains timing performance specifications)
• Voltage - Supply: 3V ~ 3.6V (ensures power supply compatibility)
• Operating Temperature: -40°C ~ 85°C (maintains thermal operating range)
• Input/Output Formats: CML, HSTL, LVDS, LVPECL, LVTTL, SSTL-2, VML inputs; LVCMOS, LVPECL outputs (ensures signal interface compatibility)
• Differential - Input:Output: Yes/Yes (maintains differential signaling capability)

The CDCM1804RGER and CDCM1804RGET variants meet these core substitution criteria. However, the CDCM1804RGET exhibits a functional difference in the Input:Output ratio (1:3 versus 1:4), which affects the number of available output channels and may impact circuit design requirements.

Parameter Comparison

Engineering Selection Recommendations

CDCM1804RGER is the primary direct substitute for CDCM1804RTHR. Both devices maintain identical electrical specifications, package configuration, and functional output ratio (1:4). The CDCM1804RGER is classified as Active product status, ensuring ongoing availability and manufacturing support. Additionally, CDCM1804RGER achieves ROHS3 compliance, whereas the original CDCM1804RTHR is RoHS non-compliant, making CDCM1804RGER the preferred choice for applications subject to environmental and regulatory requirements.

CDCM1804RGET is a functional alternative with the same electrical performance and package footprint but provides a 1:3 output ratio instead of 1:4. This variant is suitable only for applications requiring three output channels. CDCM1804RGET also maintains Active product status and ROHS3 compliance. Selection of CDCM1804RGET requires circuit design modification to accommodate the reduced number of output channels.

Frequently Asked Questions (FAQ)

Q: Can CDCM1804RGER be used as a direct replacement for CDCM1804RTHR without circuit modification?

A: Yes. CDCM1804RGER is a direct substitute with identical electrical specifications, package configuration, input/output formats, frequency rating, supply voltage, operating temperature range, and 1:4 output ratio. No circuit modification is required.

Q: What is the key difference between CDCM1804RGER and CDCM1804RGET?

A: The primary difference is the Input:Output ratio. CDCM1804RGER provides 1:4 fanout (four output channels), while CDCM1804RGET provides 1:3 fanout (three output channels). All other electrical and physical parameters are identical. Selection depends on the number of output channels required by the application.

Q: Are CDCM1804RGER and CDCM1804RGET pin-compatible with CDCM1804RTHR?

A: Yes. All three variants use the identical 24-VFQFN Exposed Pad package with 24-VQFN (4x4) supplier device package designation, ensuring PCB footprint and pin configuration compatibility.

Q: What is the significance of the RoHS compliance difference?

A: CDCM1804RTHR is RoHS non-compliant, while CDCM1804RGER and CDCM1804RGET are ROHS3 compliant. For applications subject to RoHS directives or customer environmental requirements, CDCM1804RGER or CDCM1804RGET must be selected.

Q: Why is CDCM1804RTHR classified as Obsolete?

A: Obsolete classification indicates the part is no longer in active production. CDCM1804RGER (Active status) is the recommended replacement for new designs and ongoing production requirements.

Q: Are there any packaging format differences between the substitutes?

A: CDCM1804RTHR and CDCM1804RGER have no specified packaging format. CDCM1804RGET is available in Cut Tape (CT) & Digi-Reel® packaging. All three variants share the same physical package and footprint.