CDCU877AZQLT Equivalent & Substitute Parts

Part Overview

The CDCU877AZQLT is a PLL clock driver IC manufactured by Texas Instruments, designed for DDR2 memory applications. This device functions as a clock buffer and multiplexer, operating at up to 400MHz with a 1:10 input-to-output ratio. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

CDCU877AZQLT

Texas InstrumentsIn Stock: 2430CDCU877AZQLT Datasheet

Current PartRFQ

CDCU877ANMKT

Texas InstrumentsIn Stock: 1094CDCU877ANMKT Datasheet

MFR RecommendedRFQ

98ULPA877AHT

Renesas Electronics CorporationIn Stock: 83598ULPA877AHT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CDCU877AZQLT are qualified based on the following critical parameters:

• Maximum frequency capability of 400MHz or greater
• Supply voltage range of 1.7V to 1.9V
• 1:10 input-to-output ratio
• Differential input and output signaling (Yes/Yes)
• Single circuit configuration
• 52-pin BGA package format
• Surface mount technology
• DDR2 memory application compatibility

The identified substitutes maintain electrical equivalence across these core specifications while accommodating variations in product status, compliance certifications, and packaging formats.

Parameter Comparison

Engineering Selection Recommendations

CDCU877ANMKT is the primary substitute for CDCU877AZQLT. Both parts are manufactured by Texas Instruments and share identical electrical specifications. CDCU877ANMKT maintains ROHS3 compliance and operates across the full temperature range of -40°C to 85°C. The primary distinction is product status: CDCU877ANMKT is active and available in Tape & Reel packaging, whereas CDCU877AZQLT is obsolete.

98ULPA877AHT from Renesas Electronics Corporation provides an alternative substitute with equivalent electrical performance. This device operates at 410MHz maximum frequency, exceeding the 400MHz specification of the primary part. However, the operating temperature range is restricted to 0°C to 70°C, and the part does not meet ROHS3 compliance. Selection of this substitute requires confirmation that the reduced temperature range and RoHS non-compliance status are acceptable for the target application.

Frequently Asked Questions (FAQ)

Q: Can CDCU877ANMKT directly replace CDCU877AZQLT in existing designs?

A: Yes. Both parts share identical electrical specifications, including frequency, voltage supply range, input-to-output ratio, and differential signaling characteristics. The 52-VFBGA package format is consistent between both devices. CDCU877ANMKT is the manufacturer-recommended substitute.

Q: What is the difference between CDCU877AZQLT and CDCU877ANMKT packaging?

A: CDCU877AZQLT packaging format is not specified in available data. CDCU877ANMKT is supplied in Tape & Reel (TR) format. Both use the 52-VFBGA package case.

Q: Is 98ULPA877AHT suitable for applications requiring the full -40°C to 85°C temperature range?

A: No. The 98ULPA877AHT operates only from 0°C to 70°C. Applications requiring operation below 0°C or above 70°C must use CDCU877ANMKT or CDCU877AZQLT.

Q: Does RoHS compliance status affect electrical performance?

A: No. RoHS compliance is a regulatory and material composition requirement, not an electrical performance specification. However, system-level compliance requirements may mandate selection of RoHS-compliant components.

Q: Are all three parts pin-compatible?

A: Yes. All three devices use the 52-pin BGA package format with identical pin assignments for DDR2 clock driver applications.

Q: What is the significance of the Moisture Sensitivity Level (MSL) difference?

A: CDCU877AZQLT has MSL 2 (1 Year shelf life), while CDCU877ANMKT and 98ULPA877AHT have MSL 3 (168 Hours shelf life). This affects storage and handling requirements but does not impact electrical performance or application compatibility.