MPC93R51AC Equivalent & Substitute Parts

Part Overview

The MPC93R51AC is a PLL Clock Generator IC manufactured by Renesas Electronics Corporation, designed for 240MHz clock generation in 32-LQFP surface mount packaging. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The MPC93R51AC provides LVCMOS and LVPECL input compatibility with LVCMOS output, supporting a 2:9 input-to-output frequency ratio with integrated divider and multiplier functionality.

Key Parameters

Parameter	Value
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Type	PLL Clock Generator
Frequency - Max	240MHz
PLL with Bypass	Yes
Input Compatibility	LVCMOS, LVPECL
Output Type	LVCMOS
Ratio - Input:Output	2:9
Divider/Multiplier	Yes/Yes
Voltage - Supply	3.135V ~ 3.465V
Operating Temperature	0°C ~ 70°C
Package / Case	32-LQFP
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

The 8T49N285A-999NLGI qualifies as a substitute for the MPC93R51AC based on the following substitution criteria:

Common Functional Parameters:

Manufacturer: Both manufactured by Renesas Electronics Corporation
Category: Both are Clock/Timing ICs
Type: Both are PLL Clock Generators with bypass capability
PLL Architecture: Both include integrated PLL with bypass functionality
Divider/Multiplier: Both support frequency division and multiplication
Voltage Supply Range: Both operate within overlapping supply voltage specifications (3.135V ~ 3.465V for MPC93R51AC; 2.375V ~ 3.465V for 8T49N285A-999NLGI)
Moisture Sensitivity Level: Both rated MSL 3 (168 Hours)
Compliance: Both REACH Unaffected and EAR99 classified

Enhanced Capabilities of Substitute:

Higher maximum frequency: 1GHz versus 240MHz
Extended operating temperature range: -40°C ~ 85°C versus 0°C ~ 70°C
Broader input compatibility: HCSL, LVCMOS, LVDSM, LVHSTL, LVPECL, Crystal
Enhanced output options: HSCL, LVCMOS, LVDS, LVPECL
Active product status with ongoing manufacturer support

Parameter Comparison

Parameter	MPC93R51AC	8T49N285A-999NLGI
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Category	Clock/Timing	Clock/Timing
Type	PLL Clock Generator	PLL Clock Generator
PLL with Bypass	Yes	Yes
Input Compatibility	LVCMOS, LVPECL	HCSL, LVCMOS, LVDSM, LVHSTL, LVPECL, Crystal
Output Type	LVCMOS	HSCL, LVCMOS, LVDS, LVPECL
Frequency - Max	240MHz	1GHz
Divider/Multiplier	Yes/Yes	Yes/No
Voltage - Supply	3.135V ~ 3.465V	2.375V ~ 3.465V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	32-LQFP	56-VFQFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount
Product Status	Obsolete	Active
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected
ECCN	EAR99	EAR99

Engineering Selection Recommendations

The 8T49N285A-999NLGI is suitable as a substitute for the MPC93R51AC in applications requiring PLL clock generation. The substitute part maintains compliance with REACH regulations and EAR99 export classification, consistent with the original component.

The substitute offers extended operational capabilities including higher frequency support (1GHz), wider operating temperature range (-40°C ~ 85°C), and broader input/output signal compatibility. These enhancements provide design flexibility for current and future applications.

The primary design consideration is package change from 32-LQFP to 56-VFQFN Exposed Pad, which requires PCB layout modification. The substitute's active product status ensures long-term availability and manufacturer support, addressing the obsolescence of the original MPC93R51AC.

Frequently Asked Questions (FAQ)

Q: Can the 8T49N285A-999NLGI directly replace the MPC93R51AC without PCB modifications?

A: No. The package change from 32-LQFP to 56-VFQFN Exposed Pad requires PCB layout redesign, including pin routing and thermal management adjustments for the exposed pad configuration.

Q: What are the key electrical compatibility factors between these parts?

A: Both parts operate within overlapping supply voltage ranges (3.135V ~ 3.465V minimum overlap) and share PLL architecture with bypass capability. The substitute supports the original LVCMOS and LVPECL input signals required by the MPC93R51AC.

Q: Does the substitute support the same frequency ratio as the original part?

A: The MPC93R51AC operates at a 2:9 input-to-output ratio, while the 8T49N285A-999NLGI operates at a 3:8 ratio. Frequency scaling requirements must be evaluated for specific applications.

Q: What is the significance of the package change from 32-LQFP to 56-VFQFN?

A: The 56-VFQFN package provides an exposed pad for enhanced thermal dissipation, supporting the higher 1GHz frequency capability. This requires updated thermal design and PCB layout considerations.

Q: Are both parts subject to the same moisture sensitivity requirements?

A: Yes. Both parts are rated MSL 3 (168 Hours), requiring identical moisture control and handling procedures during storage and assembly.

Q: What compliance certifications apply to the substitute part?

A: The 8T49N285A-999NLGI maintains REACH Unaffected status and EAR99 export classification, consistent with the original MPC93R51AC. The substitute is RoHS3 compliant, providing additional environmental compliance.

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