CDC421125RGER Clock Generator IC Equivalent & Substitute Parts

Part Overview

The CDC421125RGER is a Clock Generator IC manufactured by Texas Instruments, operating at 125MHz with a 24-VFQFN Exposed Pad package. This part is classified as Obsolete, making it necessary to identify active equivalent and substitute components for new designs and ongoing production requirements. The CDC421125RGER provides LVPECL output with PLL functionality, LVCMOS and Crystal input options, and operates across the -40°C to 85°C temperature range with 3V to 3.6V supply voltage.

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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the CDC421125RGER is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Frequency - Max: 125MHz (primary frequency specification)
Package / Case: 24-VFQFN Exposed Pad (mechanical compatibility)
Supplier Device Package: 24-VQFN (4x4) (PCB footprint compatibility)
Voltage - Supply: 3V ~ 3.6V (power supply compatibility)
Operating Temperature: -40°C ~ 85°C (thermal operating range)
Input: LVCMOS, Crystal (signal input compatibility)
Output: LVPECL (signal output compatibility)
PLL: Yes (functional requirement)
Number of Circuits: 1 (circuit count)
Ratio - Input:Output: 1:1 (frequency ratio)
Differential - Input:Output: No/Yes (differential signaling)

Substitute Categories:

Direct Manufacturer Recommended Substitute (MFR Recommended): CDC421A125RGER - Identical electrical specifications with Active product status, providing the direct replacement path.
Parametric Equivalents (Frequency Variants): CDC421A100RGER, CDC421A100RGET, CDC421A106RGER, CDC421A106RGET - These parts maintain identical package, voltage, temperature, input/output, and PLL specifications but operate at reduced maximum frequencies (100MHz or 106.25MHz). These are suitable for applications where the lower frequency specification is acceptable.
Packaging Variant: CDC421A125RGET - Identical to the direct substitute but with alternative tape reel packaging designation (RGET vs RGER).

Parameter Comparison

Parameter	CDC421125RGER (Main)	CDC421A125RGER (MFR Recommended)	CDC421A125RGET	CDC421A106RGER	CDC421A106RGET	CDC421A100RGER	CDC421A100RGET
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Frequency - Max	125MHz	125MHz	125MHz	106.25MHz	106.25MHz	100MHz	100MHz
Type	Clock Generator	Clock Generator	Clock Generator	Clock Generator	Clock Generator	Clock Generator	Clock Generator
PLL	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Input	LVCMOS, Crystal	LVCMOS, Crystal	LVCMOS, Crystal	LVCMOS, Crystal	LVCMOS, Crystal	LVCMOS, Crystal	LVCMOS, Crystal
Output	LVPECL	LVPECL	LVPECL	LVPECL	LVPECL	LVPECL	LVPECL
Number of Circuits	1	1	1	1	1	1	1
Ratio - Input:Output	1:1	1:1	1:1	1:1	1:1	1:1	1:1
Differential - Input:Output	No/Yes	No/Yes	No/Yes	No/Yes	No/Yes	No/Yes	No/Yes
Voltage - Supply	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V	3V ~ 3.6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	24-VFQFN Exposed Pad	24-VFQFN Exposed Pad	24-VFQFN Exposed Pad	24-VFQFN Exposed Pad	24-VFQFN Exposed Pad	24-VFQFN Exposed Pad	24-VFQFN Exposed Pad
Supplier Device Package	24-VQFN (4x4)	24-VQFN (4x4)	24-VQFN (4x4)	24-VQFN (4x4)	24-VQFN (4x4)	24-VQFN (4x4)	24-VQFN (4x4)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)	2 (1 Year)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Recommendation: CDC421A125RGER is the manufacturer-recommended substitute for CDC421125RGER. This part maintains identical electrical and mechanical specifications while offering Active product status, ensuring long-term availability and supply chain continuity. All regulatory compliance certifications (ROHS3, REACH Unaffected) are maintained.

Secondary Recommendations: CDC421A125RGET provides equivalent functionality with alternative tape reel packaging. Selection between RGER and RGET packaging variants depends on procurement and assembly line requirements.

Frequency-Reduced Alternatives: CDC421A106RGER, CDC421A106RGET, CDC421A100RGER, and CDC421A100RGET are suitable substitutes only when the application can operate at reduced maximum frequencies (106.25MHz or 100MHz respectively). These parts maintain all other electrical and mechanical parameters, package compatibility, and regulatory compliance. Selection among these variants should be based on specific frequency requirements and packaging preferences.

Frequently Asked Questions (FAQ)

Q: Can CDC421A125RGER be used as a direct replacement for CDC421125RGER? A: Yes. CDC421A125RGER is the manufacturer-recommended substitute with identical electrical specifications, package, and operating parameters. The primary difference is product status: CDC421125RGER is Obsolete while CDC421A125RGER is Active.

Q: What is the difference between CDC421A125RGER and CDC421A125RGET? A: Both parts are electrically and mechanically identical. The difference lies in tape reel packaging designation (RGER vs RGET). Selection depends on procurement and assembly line compatibility requirements.

Q: Can I use CDC421A100RGER or CDC421A106RGER in place of CDC421125RGER? A: These parts are suitable substitutes only if your application can operate at the reduced maximum frequencies of 100MHz or 106.25MHz respectively. All other electrical parameters, package specifications, and compliance certifications remain identical. Confirm frequency requirements before substitution.

Q: Are all substitute parts in the same package? A: Yes. All listed substitute parts use the 24-VFQFN Exposed Pad package with 24-VQFN (4x4) supplier device package, ensuring PCB footprint and mechanical compatibility.

Q: Do the substitute parts maintain the same supply voltage and temperature range? A: Yes. All substitute parts operate at 3V to 3.6V supply voltage and -40°C to 85°C operating temperature range, identical to the CDC421125RGER.

Q: Are all substitute parts RoHS and REACH compliant? A: Yes. All listed substitute parts are ROHS3 Compliant and REACH Unaffected, maintaining regulatory compliance requirements.

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