PI6CU877NFE Equivalent & Substitute Parts

Part Overview

The PI6CU877NFE is a PLL clock driver IC manufactured by Diodes Incorporated, designed for DDR2 SDRAM DIMM applications. This device functions as a memory clock buffer/driver with multiplexer capability, operating at a maximum frequency of 270MHz with a 1:10 input-to-output ratio. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations.

Substiute Parts

PI6CU877NFE

Diodes IncorporatedIn Stock: 20276PI6CU877NFE Datasheet

Current PartRFQ

98ULPA877AHT

Renesas Electronics CorporationIn Stock: 83598ULPA877AHT Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the PI6CU877NFE is determined by the following critical parameters:

• Primary Application: Memory, DDR2, SDRAM DIMM clock buffering
• PLL Functionality: Required (Yes)
• Signal Compatibility: SSTL-18 input and output standards
• Circuit Configuration: Single circuit, 1:10 multiplexing ratio
• Differential Signaling: Both input and output must support differential operation
• Supply Voltage Range: 1.7V ~ 1.9V compatibility
• Package Form Factor: 52-pin BGA with 4.5x7mm footprint
• Operating Temperature Range: 0°C ~ 70°C minimum requirement

The 98ULPA877AHT from Renesas Electronics Corporation meets these core substitution criteria while offering enhanced frequency capability and maintains electrical compatibility within the specified voltage and temperature parameters.

Parameter Comparison

Engineering Selection Recommendations

The 98ULPA877AHT qualifies as a functional substitute based on matching electrical specifications: identical supply voltage range (1.7V ~ 1.9V), operating temperature range (0°C ~ 70°C), circuit configuration (1:10 ratio), differential signaling capability, and compatible 52-pin BGA package footprint.

The substitute part offers superior frequency performance at 410MHz versus the original 270MHz specification, providing operational headroom for DDR2 clock distribution applications. The 98ULPA877AHT maintains active product status, ensuring long-term availability and manufacturing support compared to the obsolete PI6CU877NFE.

Compliance considerations: The PI6CU877NFE carries ROHS3 compliance certification with MSL-1 rating, while the 98ULPA877AHT is RoHS non-compliant with MSL-3 rating. Both parts carry REACH Unaffected status and identical ECCN/HTSUS classifications. Design teams must evaluate regulatory and supply chain requirements specific to their application context.

Frequently Asked Questions (FAQ)

Q: What makes the 98ULPA877AHT a valid substitute for the PI6CU877NFE?

A: Both devices share identical electrical specifications for DDR2 clock driver applications: 1.7V ~ 1.9V supply voltage, 0°C ~ 70°C operating temperature, 1:10 input-to-output ratio, differential SSTL-18 signaling, and compatible 52-pin BGA package geometry. The substitute maintains functional equivalence within the specified parameter envelope.

Q: Are the package footprints identical between these parts?

A: Both parts use 52-pin BGA packages with 4.5x7mm dimensions. The PI6CU877NFE specifies 52-VFBGA while the 98ULPA877AHT specifies 52-CABGA. These designations reflect manufacturer nomenclature but maintain identical physical footprints and pin assignments suitable for direct PCB layout compatibility.

Q: What is the significance of the higher 410MHz maximum frequency in the substitute part?

A: The 98ULPA877AHT operates at 410MHz maximum frequency compared to 270MHz for the PI6CU877NFE. This enhanced capability provides additional operational margin for DDR2 clock distribution without introducing incompatibility, as the substitute will function correctly at the original part's specified frequency range.

Q: How do the RoHS and MSL ratings differ, and what is the impact?

A: The PI6CU877NFE is ROHS3 compliant with MSL-1 (unlimited moisture exposure), while the 98ULPA877AHT is RoHS non-compliant with MSL-3 (168-hour moisture exposure limit). Organizations with RoHS compliance mandates or extended storage requirements must evaluate these differences against their specific regulatory and supply chain protocols.

Q: Can the 98ULPA877AHT be used in existing designs without PCB modifications?

A: Yes. The identical 52-pin BGA footprint (4.5x7mm) and matching pin assignments enable direct substitution on existing PCB layouts. No circuit modifications are required for electrical functionality within the specified operating parameters.