CDCU877RHATG4 Equivalent & Substitute Parts

Part Overview

The CDCU877RHATG4 is a PLL clock driver IC designed for DDR2 memory applications, manufactured by Texas Instruments. This device functions as a clock buffer and multiplexer, operating at frequencies up to 400MHz with SSTL-18 input and output signaling. The part is currently discontinued at DiGi Electronics, making identification of suitable substitutes essential for ongoing design support and production continuity.

Substiute Parts

CDCU877RHATG4

Texas InstrumentsIn Stock: 1074CDCU877RHATG4 Datasheet

Current PartRFQ

CDCU877RHAT

Texas InstrumentsIn Stock: 1654CDCU877RHAT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDCU877RHATG4 is determined by strict equivalence across the following critical parameters:

• Functional Equivalence: PLL clock driver with DDR2 memory application support
• Electrical Specifications: 400MHz maximum frequency, SSTL-18 input/output signaling, 1:10 input-to-output ratio, differential input and output capability
• Power Supply: 1.7V to 1.9V operating range
• Thermal Range: -40°C to 85°C operating temperature
• Package Compatibility: 40-VQFN (6x6) with exposed pad, surface mount configuration
• Regulatory Compliance: ROHS3 compliance and MSL 3 rating

The CDCU877RHAT variant meets all these criteria and serves as the direct substitute for the discontinued CDCU877RHATG4.

Parameter Comparison

Engineering Selection Recommendations

The CDCU877RHAT is the direct substitute for the CDCU877RHATG4. Both parts share identical electrical and mechanical specifications, with the primary distinction being product status and packaging format. The CDCU877RHAT maintains active product status and is available in Tape & Reel packaging, providing supply chain continuity for DDR2 clock driver applications.

Both parts maintain ROHS3 compliance and identical MSL ratings, ensuring compatibility with standard manufacturing and storage protocols. The transition from CDCU877RHATG4 to CDCU877RHAT requires no circuit redesign or board layout modification, as the 40-VQFN (6x6) package footprint and pinout remain unchanged.

Frequently Asked Questions (FAQ)

Q: Can CDCU877RHAT directly replace CDCU877RHATG4 without circuit modification?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including frequency response, signaling standards, power supply requirements, and package configuration. Direct substitution is supported.

Q: What is the difference between CDCU877RHATG4 and CDCU877RHAT?

A: The primary difference is product status and packaging. CDCU877RHATG4 is discontinued, while CDCU877RHAT is active. CDCU877RHAT is supplied in Tape & Reel format, whereas the original part's packaging specification was not provided.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain identical ROHS3 compliance status and MSL 3 (168 Hours) ratings. Regulatory classifications (ECCN: EAR99, HTSUS: 8542.39.0001) are equivalent.

Q: Is the 40-VQFN (6x6) package footprint identical?

A: Yes. Both parts use the same 40-VFQFN Exposed Pad package with 6x6mm dimensions, ensuring PCB layout compatibility without modification.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution is determined by matching frequency (400MHz), signaling standard (SSTL-18), input-to-output ratio (1:10), differential capability (Yes/Yes), supply voltage range (1.7V ~ 1.9V), and operating temperature range (-40°C ~ 85°C).