Renesas 252PMLF Clock/Frequency Synthesizer - Equivalent & Substitute Parts

Part Overview

The Renesas 252PMLF is a Clock/Frequency Synthesizer with Fanout Distribution and Spread Spectrum Clock Generator functionality, rated for 200MHz maximum frequency operation. This IC operates as a 1:2 input-to-output ratio device with integrated Phase-Locked Loop (PLL) and bypass capability, housed in an 8-SOIC surface mount package. The product is classified as Obsolete, necessitating identification of functionally compatible alternatives for new designs or production continuity where legacy inventory is depleted.

Substiute Parts

252PMLF

Renesas Electronics CorporationIn Stock: 750252PMLF Datasheet

Current PartRFQ

5L35021B-000NDGI

Renesas Electronics CorporationIn Stock: 7635L35021B-000NDGI Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 252PMLF is determined by the following critical parameters:

• Functional Type: Clock/Frequency Synthesizer with PLL capability
• Frequency Range: Maximum operating frequency of 200MHz or higher
• Input/Output Configuration: Support for Clock and/or Crystal inputs with CMOS or compatible output standards
• Supply Voltage Compatibility: Operating voltage range must accommodate system requirements
• Package Form Factor: Surface mount technology with pin count and footprint considerations
• Temperature Range: Operating temperature specification must meet application requirements
• Regulatory Compliance: RoHS and REACH compliance status

The identified substitute part, Renesas 5L35021B-000NDGI, operates within the same functional category as a Clock Generator with integrated PLL. While this substitute exhibits different electrical characteristics (higher maximum frequency, different voltage supply range, expanded temperature range, and different package format), it maintains core clock synthesis functionality and is manufactured by the same supplier, ensuring design continuity and supply chain reliability.

Parameter Comparison

Engineering Selection Recommendations

The 5L35021B-000NDGI is identified as the manufacturer-recommended substitute for the obsolete 252PMLF. Selection of this alternative requires evaluation of the following factors:

Product Status: The substitute part maintains Active product status, ensuring long-term availability and continued manufacturer support, whereas the main part is Obsolete.

Regulatory Compliance: Both parts maintain REACH Unaffected status. The main part is explicitly ROHS3 Compliant; compliance status for the substitute should be verified with the manufacturer if RoHS certification is a design requirement.

Electrical Compatibility: The substitute operates at a lower supply voltage range (1.71V ~ 1.89V versus 3.135V ~ 3.465V) and provides an expanded operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C). These differences require circuit-level design review to ensure compatibility with existing power distribution and thermal management strategies.

Package Transition: The substitute employs a 20-VFQFN package format versus the original 8-SOIC package, necessitating PCB layout redesign and potential changes to assembly processes.

Frequency Capability: The substitute supports 250MHz maximum frequency, exceeding the original 200MHz specification, providing design margin for future performance requirements.

Frequently Asked Questions (FAQ)

Q: Can the 5L35021B-000NDGI directly replace the 252PMLF without circuit modifications?

A: No. The substitute part requires circuit redesign due to different supply voltage requirements (1.71V ~ 1.89V versus 3.135V ~ 3.465V), different package format (20-VFQFN versus 8-SOIC), and different output signal types (LP-HCSL, LVCMOS versus CMOS). PCB layout and power delivery network modifications are necessary.

Q: What are the key electrical differences between these parts?

A: The substitute operates at significantly lower supply voltage, supports higher maximum frequency (250MHz versus 200MHz), provides expanded temperature range (-40°C ~ 85°C versus 0°C ~ 70°C), and offers different output signal standards. Input configuration (Clock and Crystal support) remains consistent.

Q: Is the substitute part suitable for applications requiring the original 3.3V supply voltage?

A: No. The substitute operates at 1.71V ~ 1.89V supply voltage, which is incompatible with 3.3V system designs. Alternative substitutes or design modifications to support lower voltage operation would be required.

Q: What package considerations apply to this substitution?

A: The original 8-SOIC package transitions to a 20-VFQFN Exposed Pad format. This requires PCB footprint redesign, updated assembly specifications, and potential changes to thermal management approaches due to the exposed pad feature.

Q: Are both parts compliant with environmental regulations?

A: Both parts maintain REACH Unaffected status. The original part is explicitly ROHS3 Compliant. Verification of RoHS compliance for the substitute should be obtained from Renesas Electronics Corporation if regulatory certification is required for your application.

Q: What is the input-to-output frequency ratio for the substitute part?

A: The substitute operates at a 1:3 input-to-output ratio, compared to the original 1:2 ratio. This difference affects frequency multiplication characteristics and requires verification against system clock distribution requirements.