CDCUA877ZQLR Equivalent & Substitute Parts

Part Overview

The CDCUA877ZQLR is a Memory DDR2 Clock Buffer/Driver IC manufactured by Texas Instruments, designed for high-speed clock distribution in DDR2 memory applications. This 52-BGA surface mount device operates at frequencies up to 410MHz with 1.8V supply voltage and features PLL-based clock generation with a 1:10 input-to-output ratio.

The CDCUA877ZQLR is classified as Obsolete, making substitute parts necessary for new designs and ongoing production requirements. Equivalent alternatives must maintain functional compatibility across critical electrical and mechanical parameters including frequency specifications, voltage supply ranges, differential signaling standards, and package dimensions.

Substiute Parts

CDCUA877ZQLR

Texas InstrumentsIn Stock: 16530CDCUA877ZQLR Datasheet

Current PartRFQ

98ULPA877AHIT

Renesas Electronics CorporationIn Stock: 75698ULPA877AHIT Datasheet

MFR RecommendedRFQ

98ULPA877AHT

Renesas Electronics CorporationIn Stock: 83598ULPA877AHT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CDCUA877ZQLR must satisfy the following critical parameters to ensure functional compatibility:

Mandatory Matching Parameters:

• Maximum frequency: 410MHz
• Supply voltage range: 1.7V ~ 1.9V
• Input/Output ratio: 1:10
• Differential signaling: Yes/Yes
• Output standard: SSTL-18
• Number of circuits: 1
• Package type: 52-VFBGA (52-BGA form factor)
• Mounting type: Surface Mount
• Main application: Memory, DDR2

Allowable Variations:

• Operating temperature range may differ (substitute parts may have narrower ranges)
• Input standard may vary (Clock input acceptable as alternative to SSTL-18)
• RoHS compliance status may differ
• Moisture Sensitivity Level may differ
• Product status may differ (Active substitutes preferred for Obsolete main part)

The identified substitute parts from Renesas Electronics Corporation meet all mandatory electrical and mechanical parameters while offering Active product status, improving long-term availability for production environments.

Parameter Comparison

Engineering Selection Recommendations

98ULPA877AHIT Selection Criteria: This Renesas substitute maintains full electrical compatibility with the CDCUA877ZQLR across all critical DDR2 clock driver parameters. The part carries Active product status, ensuring continued availability and manufacturing support. The operating temperature range of -40°C to 85°C matches the original specification, making this part suitable for applications requiring extended temperature operation. RoHS non-compliance status should be evaluated against project requirements. Moisture Sensitivity Level 3 (168 hours) requires appropriate handling procedures during storage and assembly.

98ULPA877AHT Selection Criteria: This Renesas alternative provides identical electrical specifications with the exception of operating temperature range, which is limited to 0°C to 70°C. This narrower temperature specification restricts use to commercial and industrial applications that do not require extended low-temperature operation below 0°C or high-temperature operation above 70°C. Active product status and full electrical parameter matching make this part suitable for standard DDR2 clock distribution applications within the specified temperature envelope. RoHS non-compliance and MSL 3 handling requirements apply.

Compliance Considerations: Both substitute parts maintain REACH Unaffected and EAR99 export classification status. The original CDCUA877ZQLR offers ROHS3 compliance; substitute parts are RoHS non-compliant. Design teams must evaluate RoHS requirements against project specifications and regional regulations.

Frequently Asked Questions (FAQ)

Q: Can the 98ULPA877AHIT and 98ULPA877AHT be used interchangeably with the CDCUA877ZQLR?

A: Both Renesas parts are electrically and mechanically compatible with the CDCUA877ZQLR for DDR2 clock driver applications. The 98ULPA877AHIT supports the full -40°C to 85°C temperature range, matching the original specification. The 98ULPA877AHT operates within 0°C to 70°C, suitable for commercial and industrial environments. Selection depends on application temperature requirements.

Q: What are the key differences between the two Renesas substitutes?

A: The primary difference is operating temperature range. The 98ULPA877AHIT covers -40°C to 85°C (extended range), while the 98ULPA877AHT covers 0°C to 70°C (commercial range). Both maintain identical electrical specifications including 410MHz maximum frequency, 1:10 input-to-output ratio, and SSTL-18 differential signaling. Both are Active products with MSL 3 moisture sensitivity.

Q: Are there package compatibility concerns?

A: All three parts use 52-VFBGA surface mount packages with identical 52-BGA form factors. The CDCUA877ZQLR specifies 52-BGA MICROSTAR JUNIOR (7x4.5), while Renesas parts specify 52-CABGA (4.5x7.0). These dimensions are equivalent and compatible with the same PCB footprints and assembly processes.

Q: What is the impact of RoHS non-compliance in the substitute parts?

A: The CDCUA877ZQLR is ROHS3 compliant, while both Renesas substitutes are RoHS non-compliant. Projects subject to RoHS regulations must evaluate this difference. Applications without RoHS requirements are unaffected by this compliance difference.

Q: How do moisture sensitivity levels affect handling?

A: The CDCUA877ZQLR carries MSL 2 (1 Year), allowing one year of dry storage. Both Renesas substitutes carry MSL 3 (168 Hours), requiring baking and reflow within 168 hours of package opening. Assembly operations must implement appropriate moisture control procedures for MSL 3 components.

Q: Are the input signal standards compatible?

A: The CDCUA877ZQLR specifies SSTL-18 input. The 98ULPA877AHIT and 98ULPA877AHT specify Clock input. Both configurations support the required differential input signaling for DDR2 clock distribution. The functional input compatibility is maintained across all three parts.