Renesas Electronics 181M-52LF Spread Spectrum Clock Generator Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 181M-52LF is a Spread Spectrum Clock Generator IC designed for 48MHz clock generation in 8-SOIC surface mount packaging. This component generates CMOS output signals from clock or crystal inputs using an integrated Phase-Locked Loop (PLL) architecture. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing system support, design revisions, and production continuity. Equivalent parts must maintain functional compatibility across electrical specifications, output characteristics, and physical packaging requirements.

Substiute Parts

181M-52LF

Renesas Electronics CorporationIn Stock: 1189181M-52LF Datasheet

Current PartRFQ

181M-53LF

Renesas Electronics CorporationIn Stock: 884181M-53LF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the 181M-52LF is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Package type: 8-SOIC (0.154", 3.90mm Width) — ensures PCB footprint compatibility
• Output type: CMOS — maintains signal level compatibility with downstream circuits
• Supply voltage range: 3.135V to 5.5V — ensures operation within system power specifications
• PLL architecture: Yes — confirms functional clock generation capability
• Input options: Clock, Crystal — maintains input flexibility
• Number of circuits: 1 — single clock generator function
• Input:Output ratio: 1:1 — preserves frequency relationship

Allowable Variation:

• Maximum frequency: Substitute parts may operate at equal or higher maximum frequencies, provided all other electrical and mechanical parameters remain within specification
• Product status: Active substitute parts are preferred for long-term availability and support

The 181M-53LF meets all mandatory compatibility criteria and represents a direct functional substitute with enhanced frequency capability.

Parameter Comparison

Engineering Selection Recommendations

The 181M-53LF is the manufacturer-recommended substitute for the obsolete 181M-52LF. Selection is based on the following engineering factors:

Electrical Compatibility: Both parts operate within identical supply voltage ranges (3.135V to 5.5V) and temperature ranges (0°C to 70°C). The 181M-53LF's higher maximum frequency (75MHz versus 48MHz) does not create incompatibility; systems designed for 48MHz operation function correctly with a 75MHz-capable device.

Physical Compatibility: Identical 8-SOIC packaging ensures direct PCB footprint compatibility without layout modifications.

Functional Compatibility: Both parts employ identical PLL architecture, support clock and crystal inputs, and deliver CMOS output signals with 1:1 input:output ratio.

Compliance and Availability: The 181M-53LF holds Active product status with ROHS3 compliance certification, ensuring long-term supply chain availability and regulatory alignment. The 181M-52LF's Obsolete status necessitates transition to an actively manufactured equivalent.

Base Product Alignment: Both parts share the 181M base product number, confirming manufacturer-level design continuity.

Frequently Asked Questions (FAQ)

Q: Can the 181M-53LF directly replace the 181M-52LF without PCB modifications?

A: Yes. Both parts use identical 8-SOIC (0.154", 3.90mm Width) packaging. No PCB layout changes are required. Pin-to-pin compatibility is maintained.

Q: Why does the 181M-53LF have a higher maximum frequency (75MHz) than the 181M-52LF (48MHz)?

A: The 181M-53LF represents an enhanced variant within the same product family. Higher maximum frequency capability does not affect compatibility with systems designed for lower frequencies. The part operates correctly at any frequency up to its maximum rating.

Q: Are the supply voltage and operating temperature ranges identical?

A: Yes. Both parts operate across 3.135V to 5.5V supply voltage and 0°C to 70°C temperature ranges. System power and thermal requirements remain unchanged.

Q: What is the significance of the 181M-53LF's ROHS3 compliance?

A: ROHS3 compliance indicates the substitute part meets current environmental and regulatory standards for electronic components. This supports long-term design validity and supply chain continuity.

Q: Is the 181M-53LF the only available substitute?

A: The 181M-53LF is the manufacturer-recommended substitute. It is the primary equivalent part for the obsolete 181M-52LF within the Renesas Electronics product portfolio.

Q: Do both parts support the same input options (Clock and Crystal)?

A: Yes. Both the 181M-52LF and 181M-53LF accept clock or crystal inputs, maintaining design flexibility for different system configurations.

Q: What is the Moisture Sensitivity Level (MSL) for both parts?

A: Both parts carry MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.