CDC421312RGET Clock Generator IC Equivalent & Substitute Parts

Part Overview

The CDC421312RGET is a Clock Generator IC manufactured by Texas Instruments, operating at a maximum frequency of 312.5MHz in a 24-VFQFN Exposed Pad surface mount package. This part is classified as Obsolete, making substitute parts necessary for new designs and ongoing production requirements. The device features PLL functionality with LVCMOS and Crystal inputs, delivering LVPECL output suitable for high-speed timing applications. Equivalent and substitute models within the CDC421A series maintain identical electrical and mechanical specifications while offering active product status and improved availability.

Key Parameters

Parameter	CDC421312RGET
Manufacturer	Texas Instruments
Category	Clock/Timing
Type	Clock Generator
Frequency - Max	312.5MHz
PLL	Yes
Input Type	LVCMOS, Crystal
Output Type	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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the CDC421312RGET are selected from the Texas Instruments CDC421A series based on strict electrical and mechanical compatibility. All substitute candidates maintain identical specifications across the following critical parameters:

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

The primary differentiator among substitute parts is the maximum frequency specification. Substitute parts are available at lower frequency ratings (100MHz, 106.25MHz, 125MHz, 156.25MHz, and 212.5MHz) compared to the original 312.5MHz specification. Selection of a substitute part depends on the actual frequency requirement of the application. Parts with equal or higher frequency ratings than the design requirement are electrically compatible.

Parameter Comparison

Part Number	Manufacturer	Frequency - Max	Package / Case	Voltage - Supply	Operating Temperature	Input Type	Output Type	Product Status	Inventory (Pcs)
CDC421312RGET	Texas Instruments	312.5MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	Obsolete	821
CDC421A100RGER	Texas Instruments	100MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	Active	1338
CDC421A100RGET	Texas Instruments	100MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	Active	742
CDC421A106RGER	Texas Instruments	106.25MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	Active	1878
CDC421A106RGET	Texas Instruments	106.25MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	Active	824
CDC421A125RGER	Texas Instruments	125MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	Active	3460
CDC421A125RGET	Texas Instruments	125MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	Active	879
CDC421A156RGER	Texas Instruments	156.25MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	Active	1311
CDC421A156RGET	Texas Instruments	156.25MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	Active	882
CDC421A212RGER	Texas Instruments	212.5MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	Active	1417
CDC421A212RGET	Texas Instruments	212.5MHz	24-VFQFN Exposed Pad	3V ~ 3.6V	-40°C ~ 85°C	LVCMOS, Crystal	LVPECL	Active	719

Engineering Selection Recommendations

The CDC421312RGET is classified as Obsolete, necessitating transition to active product alternatives. All listed substitute parts maintain ROHS3 compliance and REACH Unaffected status, ensuring regulatory alignment with the original component.

For applications requiring the full 312.5MHz capability of the original part, no direct frequency-matched substitute exists within the provided CDC421A series. In such cases, the CDC421A212RGET or CDC421A212RGER (212.5MHz maximum) represents the highest available frequency option, though this operates below the original specification.

For applications with lower frequency requirements, substitute selection should match or exceed the design frequency requirement. The CDC421A125RGER variant offers the highest inventory availability (3460 units) among the 125MHz options, while CDC421A156RGER and CDC421A156RGET provide 156.25MHz capability with active product status.

All substitute parts are available in both Tape & Reel (TR) packaging configurations, supporting production volume requirements. The VFQFN package format and MSL 2 moisture sensitivity rating remain consistent across all alternatives, enabling direct PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can CDC421A series parts directly replace the CDC421312RGET?

A: CDC421A series parts are electrically and mechanically compatible with the CDC421312RGET across all specified parameters except maximum frequency. Substitution is valid when the application frequency requirement does not exceed the substitute part's maximum frequency rating.

Q: What is the difference between RGER and RGET packaging designations?

A: Both RGER and RGET designations indicate Tape & Reel (TR) packaging. The suffix letter variation reflects internal Texas Instruments manufacturing or distribution coding and does not affect electrical performance or mechanical compatibility.

Q: Is the CDC421A212RGET suitable as a substitute for 312.5MHz applications?

A: The CDC421A212RGET operates at a maximum frequency of 212.5MHz, which is below the original 312.5MHz specification. This part is suitable only for applications with frequency requirements at or below 212.5MHz.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All CDC421A series substitute parts listed maintain ROHS3 Compliant status and REACH Unaffected designation, matching the regulatory compliance of the original CDC421312RGET.

Q: What is the moisture sensitivity level for these clock generator ICs?

A: All parts, including the original and substitutes, carry MSL 2 (1 Year) moisture sensitivity rating. This specification applies to the 24-VFQFN Exposed Pad package format and requires standard moisture control during storage and handling.

Q: Can I use a lower frequency substitute part in a design originally specified for 312.5MHz?

A: Substitution with a lower frequency part is not recommended for designs requiring the full 312.5MHz specification. The substitute part will not meet the timing performance requirements of the original design. Frequency selection must match or exceed the application requirement.

Q: What supply voltage range do these clock generators support?

A: All parts operate within the 3V to 3.6V supply voltage range. This specification is consistent across the CDC421312RGET and all CDC421A series substitutes.

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