Equivalent & Substitute Parts for Renesas 252M-46LF

Part Overview

The Renesas 252M-46LF is a Clock/Frequency Synthesizer with Spread Spectrum Clock Generator functionality, rated for 200MHz maximum frequency operation. This device features integrated Phase-Locked Loop (PLL) with bypass capability and operates across a 3.135V to 3.465V supply voltage range in an 8-SOIC surface mount package.

The 252M-46LF carries an Obsolete product status. Obsolescence necessitates identification of functionally equivalent alternatives to maintain design continuity and ensure long-term component availability for production and field support applications.

Key Parameters

Parameter	Specification
Manufacturer	Renesas Electronics Corporation
Category	Clock/Timing
Type	Clock/Frequency Synthesizer, Spread Spectrum Clock Generator
Frequency - Max	200MHz
PLL	Yes with Bypass
Input Type	Clock, Crystal
Output Type	CMOS
Voltage - Supply	3.135V ~ 3.465V
Operating Temperature	0°C ~ 70°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Number of Circuits	1
Divider/Multiplier	Yes/Yes

Substitute Part Grouping Explanation

Substitution of the obsolete 252M-46LF is based on functional equivalence within the Clock/Timing category. The primary substitute, Renesas 5P35021B-000NDGI, qualifies as an equivalent alternative based on the following criteria:

Substitution-Determining Parameters:

Manufacturer Continuity: Both devices are manufactured by Renesas Electronics Corporation, ensuring design support and documentation consistency
Functional Category: Both are Clock Generator/Synthesizer devices with integrated PLL and bypass capability
Supply Voltage Compatibility: The 5P35021B-000NDGI supports the 3.135V ~ 3.465V range required by the 252M-46LF, alongside additional voltage options
Input/Output Capability: Both devices accept Clock and Crystal inputs; the substitute provides expanded output format options (LP-HCSL, LVCMOS, LVDS, LVPECL) while maintaining CMOS compatibility
Surface Mount Technology: Both employ surface mount packaging for PCB integration
Single Circuit Configuration: Both contain one functional circuit block

Enhanced Specifications of Substitute:

The 5P35021B-000NDGI operates at 500MHz maximum frequency, exceeding the 200MHz capability of the 252M-46LF. The substitute features an extended operating temperature range (-40°C ~ 85°C) compared to the original device (0°C ~ 70°C), providing broader environmental applicability. The substitute carries Active product status with full RoHS3 compliance and MSL Level 1 rating.

Parameter Comparison

Parameter	252M-46LF (Original)	5P35021B-000NDGI (Substitute)
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation
Category	Clock/Timing	Clock/Timing
Type	Clock/Frequency Synthesizer, Spread Spectrum Clock Generator	Clock Generator
PLL	Yes with Bypass	Yes with Bypass
Input Type	Clock, Crystal	LVCMOS, Crystal
Output Type	CMOS	LP-HCSL, LVCMOS, LVDS, LVPECL
Number of Circuits	1	1
Frequency - Max	200MHz	500MHz
Voltage - Supply	3.135V ~ 3.465V	1.71V ~ 1.89V, 2.375V ~ 2.625V, 3.135V ~ 3.465V
Operating Temperature	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount
Package / Case	8-SOIC (0.154", 3.90mm Width)	20-VFQFN Exposed Pad (3x3)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The 5P35021B-000NDGI is the manufacturer-recommended substitute for the obsolete 252M-46LF. Selection of this alternative is supported by the following engineering factors:

Product Status and Lifecycle: The substitute carries Active product status, ensuring continued manufacturing, technical support, and long-term availability. The original device's Obsolete classification creates supply chain risk and limits access to design documentation updates.

Compliance and Certifications: The 5P35021B-000NDGI holds RoHS3 compliance and REACH Unaffected status, meeting current regulatory requirements for electronic component procurement. The device carries Moisture Sensitivity Level 1 (Unlimited), indicating robust handling characteristics suitable for standard manufacturing environments.

Functional Compatibility: Both devices operate within the 3.135V ~ 3.465V supply voltage range, enabling direct integration into existing power distribution architectures. The substitute's expanded output format options (LP-HCSL, LVCMOS, LVDS, LVPECL) provide design flexibility while maintaining backward compatibility through CMOS output capability.

Thermal and Frequency Headroom: The substitute's extended operating temperature range (-40°C ~ 85°C) and higher maximum frequency (500MHz) provide operational margin beyond the original device specifications, supporting applications with demanding environmental or performance requirements.

Package Transition Consideration: The substitute employs a 20-VFQFN package versus the original 8-SOIC package. This represents a package footprint change requiring PCB layout modification. The VersaClock® series designation indicates Renesas' current-generation clock synthesis platform.

Frequently Asked Questions (FAQ)

Q: Can the 5P35021B-000NDGI directly replace the 252M-46LF without PCB modifications?

A: No. The substitute uses a 20-VFQFN package (3x3mm) compared to the original 8-SOIC package. PCB layout redesign is required, including footprint changes, trace routing, and via placement. Pin-to-pin compatibility does not exist between these packages.

Q: Are the supply voltage requirements compatible between these devices?

A: Yes. The 5P35021B-000NDGI supports the 3.135V ~ 3.465V range required by the 252M-46LF. The substitute additionally supports 1.71V ~ 1.89V and 2.375V ~ 2.625V ranges, providing flexibility for multi-voltage system designs.

Q: What is the significance of the extended operating temperature range in the substitute?

A: The 5P35021B-000NDGI operates from -40°C to 85°C, compared to the original device's 0°C to 70°C range. This extended range qualifies the substitute for industrial and automotive applications requiring broader thermal performance specifications.

Q: Does the higher maximum frequency (500MHz) of the substitute create compatibility issues?

A: No. The substitute's 500MHz capability exceeds the original 200MHz specification, providing frequency headroom. Applications requiring 200MHz operation function within the substitute's operating envelope. Frequency configuration is typically programmable through input clock selection and internal divider settings.

Q: What does the VersaClock® series designation indicate?

A: VersaClock® is Renesas' current-generation clock synthesis product line. This designation indicates the 5P35021B-000NDGI represents modern clock generation technology with enhanced features, compliance certifications, and long-term product support compared to legacy devices.

Q: Are there differences in input signal requirements between the devices?

A: The original device accepts Clock or Crystal inputs. The substitute accepts LVCMOS or Crystal inputs. Both devices support crystal oscillator configurations. LVCMOS input compatibility on the substitute provides additional flexibility for clock distribution applications.

Q: What is the Moisture Sensitivity Level (MSL) rating and why is it relevant?

A: The substitute carries MSL Level 1 (Unlimited), indicating no moisture sensitivity restrictions. This rating simplifies manufacturing logistics, storage, and handling procedures compared to higher MSL-rated components, reducing production risk and cost.

Q: How does the output format expansion affect circuit design?

A: The substitute provides LP-HCSL, LVCMOS, LVDS, and LVPECL output options versus the original CMOS-only output. Designs requiring CMOS output operate identically to the original device. Additional output formats enable integration into systems requiring differential signaling (LVDS, LVPECL) or low-power applications (LP-HCSL).

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