CDC421125RGET Clock Generator IC Equivalent & Substitute Parts

Part Overview

The CDC421125RGET is a Clock Generator IC manufactured by Texas Instruments, operating at 125MHz with a 24-VFQFN Exposed Pad package. This device features PLL functionality, LVCMOS/Crystal input, and LVPECL output configuration. The part is currently classified as Obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Category	Clock/Timing
Type	Clock Generator
Frequency - Max	125MHz
PLL	Yes
Input	LVCMOS, Crystal
Output	LVPECL
Number of Circuits	1
Ratio - Input:Output	1:1
Differential - Input:Output	No/Yes
Voltage - Supply	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	24-VFQFN Exposed Pad
Supplier Device Package	24-VQFN (4x4)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8542.39.0001

Substitute Part Grouping Explanation

Substitution of the CDC421125RGET is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Manufacturer: Texas Instruments
Package / Case: 24-VFQFN Exposed Pad
Supplier Device Package: 24-VQFN (4x4)
Input: LVCMOS, Crystal
Output: LVPECL
Number of Circuits: 1
Ratio - Input:Output: 1:1
Differential - Input:Output: No/Yes
Voltage - Supply: 3V ~ 3.6V
Operating Temperature: -40°C ~ 85°C
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 2 (1 Year)
REACH Status: REACH Unaffected

Frequency Variants: Substitute parts are available in three frequency configurations: 100MHz, 106.25MHz, and 125MHz. Each frequency variant maintains all other electrical and mechanical specifications identical to the original CDC421125RGET.

Packaging Variants: Substitute parts are available in two packaging options: Tape & Reel (TR) and standard packaging. The 24-VQFN (4x4) footprint remains consistent across all variants.

Parameter Comparison

Part Number	Manufacturer	Product Status	Frequency - Max	Package / Case	Voltage - Supply	Operating Temperature	Input	Output	RoHS Status	Packaging
CDC421125RGET	Texas Instruments	Obsolete	125MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	ROHS3 Compliant	Standard
CDC421A125RGET	Texas Instruments	Active	125MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	ROHS3 Compliant	Tape & Reel (TR)
CDC421A125RGER	Texas Instruments	Active	125MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	ROHS3 Compliant	Tape & Reel (TR)
CDC421A106RGET	Texas Instruments	Active	106.25MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	ROHS3 Compliant	Tape & Reel (TR)
CDC421A106RGER	Texas Instruments	Active	106.25MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	ROHS3 Compliant	Tape & Reel (TR)
CDC421A100RGET	Texas Instruments	Active	100MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	ROHS3 Compliant	Tape & Reel (TR)
CDC421A100RGER	Texas Instruments	Active	100MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	ROHS3 Compliant	Tape & Reel (TR)

Engineering Selection Recommendations

All substitute parts listed maintain Active product status with Texas Instruments, ensuring long-term availability and manufacturing support. All alternatives are ROHS3 Compliant and REACH Unaffected, meeting current regulatory requirements.

For direct replacement of CDC421125RGET in applications requiring 125MHz operation, CDC421A125RGET and CDC421A125RGER are functionally equivalent. Both parts are available in Tape & Reel packaging and maintain identical electrical specifications.

For applications where lower frequency operation is acceptable, CDC421A106RGET, CDC421A106RGER, CDC421A100RGET, and CDC421A100RGER provide parametric equivalents with reduced maximum frequency ratings while maintaining all other electrical and mechanical characteristics.

Selection between RGET and RGER packaging variants depends on procurement and assembly requirements, as both maintain identical electrical performance and package footprint.

Frequently Asked Questions (FAQ)

Q: Can CDC421A125RGET directly replace CDC421125RGET? A: Yes. CDC421A125RGET is functionally equivalent, maintaining identical frequency, electrical specifications, and package footprint. The primary difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. standard).

Q: What is the difference between RGET and RGER packaging variants? A: Both RGET and RGER variants use identical 24-VQFN (4x4) footprints and electrical specifications. The suffix designates packaging format and tape configuration for automated assembly. Selection depends on procurement and manufacturing processes.

Q: Can lower frequency variants (100MHz, 106.25MHz) substitute for the 125MHz CDC421125RGET? A: Lower frequency variants are parametric equivalents that maintain all electrical and mechanical specifications except maximum frequency. Substitution is valid only if the application does not require 125MHz operation.

Q: Are all substitute parts ROHS3 Compliant? A: Yes. All listed substitute parts maintain ROHS3 Compliance and REACH Unaffected status, meeting current environmental and regulatory requirements.

Q: What is the Moisture Sensitivity Level for all parts? A: All parts maintain MSL 2 (1 Year), indicating standard moisture handling requirements for surface mount assembly.

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