CDCUA877ZQLT Equivalent & Substitute Parts

Part Overview

The CDCUA877ZQLT is a PLL clock driver IC manufactured by Texas Instruments, designed for DDR2 memory applications. This device operates at 1.8V with a maximum frequency of 410MHz and provides 1:10 input-to-output ratio clock distribution in a 52-BGA package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Substiute Parts

CDCUA877ZQLT

Texas InstrumentsIn Stock: 2402CDCUA877ZQLT Datasheet

Current PartRFQ

CDCUA877NMKT

Texas InstrumentsIn Stock: 1054CDCUA877NMKT Datasheet

MFR RecommendedRFQ

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 CDCUA877ZQLT are qualified based on the following critical parameters that must match or remain compatible:

• Frequency - Max: 410MHz (exact match required)
• Voltage - Supply: 1.7V ~ 1.9V (exact match required)
• Ratio - Input:Output: 1:10 (exact match required)
• Differential - Input:Output: Yes/Yes (exact match required)
• Number of Circuits: 1 (exact match required)
• Main Purpose: Memory, DDR2 (exact match required)
• PLL Function: Yes (exact match required)
• Package / Case: 52-VFBGA (exact match required)
• Mounting Type: Surface Mount (exact match required)

The CDCUA877NMKT from Texas Instruments is the direct manufacturer-recommended equivalent, maintaining identical electrical specifications and active product status. The Renesas Electronics Corporation parts (98ULPA877AHIT and 98ULPA877AHT) provide functional equivalence with compatible electrical parameters but differ in operating temperature ranges and RoHS compliance status.

Parameter Comparison

Engineering Selection Recommendations

CDCUA877NMKT is the primary substitute for CDCUA877ZQLT. Both parts are manufactured by Texas Instruments, maintain identical electrical specifications, and are packaged identically. The CDCUA877NMKT holds active product status and ROHS3 compliance, making it suitable for new designs and legacy system replacements. The higher MSL rating (3 vs. 2) requires attention to moisture control during storage and assembly.

98ULPA877AHIT and 98ULPA877AHT from Renesas Electronics Corporation are functional equivalents that meet all critical electrical parameters. Both maintain the required 410MHz frequency, 1:10 ratio, and 1.7V ~ 1.9V supply voltage. The 98ULPA877AHIT supports the full industrial temperature range (-40°C ~ 85°C), while the 98ULPA877AHT is limited to 0°C ~ 70°C. Both Renesas parts are RoHS non-compliant, which may restrict their use in applications with RoHS requirements. MSL rating of 3 applies to both Renesas options.

Frequently Asked Questions (FAQ)

Q: Can CDCUA877NMKT directly replace CDCUA877ZQLT without design changes?

A: Yes. The CDCUA877NMKT is the manufacturer-recommended equivalent with identical electrical specifications, frequency, voltage supply range, input-to-output ratio, and package configuration. No circuit modifications are required.

Q: What is the difference between the two Renesas parts (98ULPA877AHIT and 98ULPA877AHT)?

A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is operating temperature range: 98ULPA877AHIT supports -40°C ~ 85°C (industrial), while 98ULPA877AHT supports 0°C ~ 70°C (commercial). Select based on your application's temperature requirements.

Q: Are the Renesas parts suitable for RoHS-compliant applications?

A: No. Both Renesas parts (98ULPA877AHIT and 98ULPA877AHT) are RoHS non-compliant. If RoHS compliance is required, use CDCUA877NMKT, which is ROHS3 compliant.

Q: What does the MSL rating difference mean for handling?

A: CDCUA877ZQLT has MSL 2 (1 Year floor life), while CDCUA877NMKT and both Renesas parts have MSL 3 (168 Hours floor life). MSL 3 components require more careful moisture control during storage and assembly. Ensure proper baking procedures before reflow soldering for MSL 3 parts.

Q: Are all substitute parts available in the same package?

A: Yes. All parts use 52-VFBGA surface mount packages with identical footprints (7x4.5mm or 4.5x7.0mm), ensuring PCB compatibility without layout modifications.

Q: Which substitute should I choose for a new design?

A: CDCUA877NMKT is recommended for new designs. It maintains Texas Instruments manufacturing, active product status, ROHS3 compliance, and identical specifications to the obsolete CDCUA877ZQLT. Renesas parts are suitable alternatives if supply constraints exist, provided RoHS compliance is not required and operating temperature requirements are met.