CDCR81DBQRG4 Equivalent & Substitute Parts

Part Overview

The CDCR81DBQRG4 is a Direct RAMBUS Clock Generator IC manufactured by Texas Instruments, designed for memory applications requiring RDRAM clock frequency generation. This device operates at a maximum frequency of 300MHz with a single output and is housed in a 24-SSOP package. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain functional and electrical compatibility for ongoing system support and new designs.

Substiute Parts

CDCR81DBQRG4

Texas InstrumentsIn Stock: 1074CDCR81DBQRG4 Datasheet

Current PartRFQ

9212AF-13LF-IN0

Renesas Electronics CorporationIn Stock: 9409212AF-13LF-IN0 Datasheet

MFR RecommendedRFQ

9212AF-13LFT-IN0

Renesas Electronics CorporationIn Stock: 10009212AF-13LFT-IN0 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDCR81DBQRG4 is based on the following critical parameters that must align between the original and substitute parts:

• Package Type: Both parts must use 24-SSOP surface mount packaging with identical physical dimensions (0.154", 3.90mm Width)
• Supply Voltage Range: Substitute parts must operate within the 3.135V ~ 3.465V supply voltage specification
• Functional Purpose: Both parts must serve as Direct RAMBUS Clock Generators for memory applications
• Circuit Configuration: Single output circuit with 1:1 input-to-output ratio
• PLL Capability: Substitute parts must include integrated Phase-Locked Loop functionality
• Differential Signaling: Input/Output differential configuration must be compatible (No/Yes)

The substitute parts identified below meet these core substitution criteria while offering enhanced performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

Both Renesas Electronics Corporation substitute parts (9212AF-13LF-IN0 and 9212AF-13LFT-IN0) are suitable replacements for the obsolete CDCR81DBQRG4. Selection between these two Renesas alternatives should be based on application-specific requirements:

9212AF-13LF-IN0: Recommended for standard production environments where standard moisture sensitivity handling is acceptable.

9212AF-13LFT-IN0: Recommended for applications requiring extended shelf life and reduced moisture sensitivity risk, as indicated by MSL 1 (Unlimited) rating compared to MSL 2 (1 Year) of the original part.

Both substitute parts maintain full compliance with ROHS3 and REACH standards. The enhanced maximum frequency specification (600MHz versus 300MHz) of the Renesas parts provides additional performance headroom for clock generation applications. The narrower operating temperature range (0°C ~ 70°C) of the substitutes should be evaluated against specific system thermal requirements.

Frequently Asked Questions (FAQ)

Q: Can the 9212AF-13LF-IN0 or 9212AF-13LFT-IN0 directly replace the CDCR81DBQRG4 without PCB modifications?

A: Yes. Both substitute parts use identical 24-SSOP packaging with matching physical dimensions and pin spacing. No PCB layout changes are required for mechanical or electrical compatibility at the package level.

Q: What is the difference between the two Renesas substitute parts?

A: The primary difference is the Moisture Sensitivity Level (MSL) rating. The 9212AF-13LF-IN0 carries MSL 1 (Unlimited), while the 9212AF-13LFT-IN0 also carries MSL 1 (Unlimited). Both parts offer identical electrical specifications and performance characteristics. Selection should be based on supply chain availability and specific handling requirements.

Q: Does the higher maximum frequency (600MHz) of the substitute parts affect compatibility?

A: No. The substitute parts operate within the same supply voltage range (3.135V ~ 3.465V) and maintain the same 1:1 input-to-output ratio as the original part. The enhanced frequency capability does not introduce incompatibility; it provides additional performance margin for the application.

Q: Are there any temperature range considerations when substituting?

A: The substitute parts operate over 0°C ~ 70°C, which is narrower than the original part's 0°C ~ 85°C range. Applications requiring operation above 70°C should be evaluated for thermal compatibility before substitution.

Q: Are both substitute parts RoHS and REACH compliant?

A: Yes. Both 9212AF-13LF-IN0 and 9212AF-13LFT-IN0 are ROHS3 Compliant and REACH Unaffected, matching the compliance status of the original CDCR81DBQRG4.