CDCU2A877ZQLT Equivalent & Substitute Parts

Part Overview

The CDCU2A877ZQLT is a PLL clock driver IC manufactured by Texas Instruments, designed for DDR2 memory applications. This device functions as a zero-delay buffer and multiplexer, operating at frequencies up to 410MHz with 1.8V supply voltage. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations where legacy compatibility is required.

Substiute Parts

CDCU2A877ZQLT

Texas InstrumentsIn Stock: 1244CDCU2A877ZQLT Datasheet

Current PartRFQ

98ULPA877AHT

Renesas Electronics CorporationIn Stock: 83598ULPA877AHT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CDCU2A877ZQLT are identified based on the following critical parameters that determine functional equivalence:

• Main Purpose: Memory, DDR2 clock buffering application
• PLL Functionality: Presence of integrated phase-locked loop
• Number of Circuits: Single circuit configuration
• Input:Output Ratio: 1:10 multiplexing ratio
• Maximum Frequency: 410MHz operation capability
• Supply Voltage Range: 1.7V ~ 1.9V compatibility
• Operating Temperature Range: 0°C ~ 70°C
• Package Type: 52-pin BGA form factor
• Differential Input/Output: Yes/Yes configuration

The Renesas Electronics Corporation part 98ULPA877AHT meets all critical functional parameters and package requirements, making it a direct functional substitute despite differences in product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The 98ULPA877AHT from Renesas Electronics Corporation is functionally equivalent to the CDCU2A877ZQLT across all critical electrical and mechanical parameters. The primary distinction is product status: the Renesas part is currently active in production, whereas the Texas Instruments part is obsolete.

For new designs or systems requiring ongoing component availability, the 98ULPA877AHT is the appropriate selection. The part maintains identical frequency specifications, voltage supply range, temperature operating range, and package form factor.

Compliance considerations differ between the two parts. The CDCU2A877ZQLT carries ROHS3 compliance certification, while the 98ULPA877AHT is RoHS non-compliant. Moisture sensitivity levels also differ: the Texas Instruments part specifies MSL 2 (1 Year), while the Renesas part specifies MSL 3 (168 Hours). These factors must be evaluated against specific application requirements and regulatory obligations.

Frequently Asked Questions (FAQ)

Q: Can the 98ULPA877AHT directly replace the CDCU2A877ZQLT in existing designs?

A: Yes. Both parts share identical electrical specifications including frequency range (410MHz), supply voltage (1.7V ~ 1.9V), operating temperature (0°C ~ 70°C), and package configuration (52-VFBGA). The 1:10 input:output ratio and differential signaling characteristics are identical. Pin-level compatibility exists for DDR2 clock buffering applications.

Q: What are the compliance differences between these parts?

A: The CDCU2A877ZQLT is ROHS3 compliant with MSL 2 rating (1 Year shelf life). The 98ULPA877AHT is RoHS non-compliant with MSL 3 rating (168 Hours shelf life). Applications subject to RoHS regulations or requiring extended shelf-life storage must account for these differences.

Q: Why is the CDCU2A877ZQLT classified as obsolete?

A: Obsolescence reflects Texas Instruments' product lifecycle decisions. The Renesas 98ULPA877AHT remains in active production, providing continued availability for DDR2 clock driver applications.

Q: Are there any package differences between these parts?

A: Both parts use 52-pin BGA packaging. The Texas Instruments part specifies 52-BGA MICROSTAR JUNIOR (7x4.5), while the Renesas part specifies 52-CABGA (4.5x7.0). These represent equivalent BGA configurations with identical pin counts and compatible footprints for DDR2 applications.

Q: What factors should determine which part to select?

A: Selection should be based on component availability, compliance requirements (RoHS status), storage conditions (MSL rating), and supply chain continuity. For new designs, the active production status of the 98ULPA877AHT provides supply assurance. For legacy system support, either part is functionally suitable if compliance and storage requirements are met.