Renesas Electronics 8402AYLF Frequency Synthesizer IC - Equivalent & Substitute Parts

Part Overview

The Renesas Electronics 8402AYLF is a Frequency Synthesizer IC designed for clock and timing applications, capable of generating frequencies up to 350MHz. This device features a Phase-Locked Loop (PLL) with bypass capability, crystal input, and LVCMOS/LVTTL output configurations. The 8402AYLF is classified as an obsolete product, making identification of suitable substitute components essential for ongoing system support and new design implementations. Substitute parts must maintain functional equivalence in frequency synthesis capability, PLL architecture, and output signal characteristics while accommodating modern packaging and compliance requirements.

Substiute Parts

8402AYLF

Renesas Electronics CorporationIn Stock: 11818402AYLF Datasheet

Current PartRFQ

840N202CKI-000LF

Renesas Electronics CorporationIn Stock: 903840N202CKI-000LF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 8402AYLF is determined by the following critical parameters:

Functional Requirements:

• PLL with Bypass capability
• Frequency Synthesizer architecture
• Crystal input support
• LVCMOS and LVTTL output compatibility
• Single circuit configuration

Electrical Specifications:

• Maximum frequency operation capability (minimum 250MHz required for functional equivalence)
• Supply voltage range compatibility (overlap with 3.135V ~ 3.465V)
• Number of output circuits (1 circuit)

Physical & Environmental:

• Surface mount technology
• Operating temperature range (extended range preferred for broader application support)
• Moisture sensitivity classification
• REACH and ECCN compliance status

The substitute part 840N202CKI-000LF meets these criteria through equivalent PLL architecture, frequency synthesis capability, crystal input support, and LVCMOS/LVTTL output configuration, while offering enhanced operating temperature range and active product status.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The 8402AYLF is classified as obsolete, while the 840N202CKI-000LF is active. Active product status ensures ongoing manufacturer support, availability, and compliance with current regulatory requirements.

Compliance & Certifications: The 840N202CKI-000LF provides ROHS3 compliance, meeting modern environmental and hazardous substance restrictions. Both parts maintain REACH Unaffected and EAR99 ECCN classifications, ensuring consistent export and regulatory compliance.

Functional Equivalence: Both devices implement PLL-based frequency synthesis with crystal input and LVCMOS/LVTTL output. The 840N202CKI-000LF supports additional input types (HCSL, LVDS, LVHSTL, LVPECL) beyond crystal, providing design flexibility without compromising crystal-based operation.

Operating Envelope: The 840N202CKI-000LF extends the operating temperature range to -40°C ~ 85°C, compared to the 8402AYLF range of 0°C ~ 70°C. This broader range accommodates industrial and extended-temperature applications. Supply voltage range compatibility is maintained within the specified 3.135V ~ 3.465V window.

Frequency Specification: The 8402AYLF supports maximum frequency of 350MHz, while the 840N202CKI-000LF supports 250MHz. For applications requiring frequencies above 250MHz, the 840N202CKI-000LF is not suitable. For applications operating at or below 250MHz, the substitute part provides full functional equivalence.

Package Consideration: The 8402AYLF uses 32-LQFP (7x7) packaging, while the 840N202CKI-000LF uses 40-VFQFN Exposed Pad (6x6) packaging. PCB layout modifications are required for package transition. The VFQFN package with exposed pad provides improved thermal performance.

Frequently Asked Questions (FAQ)

Q: Can the 840N202CKI-000LF directly replace the 8402AYLF without circuit modifications?

A: Functional substitution is possible for applications operating at frequencies up to 250MHz. However, package differences (32-LQFP vs. 40-VFQFN) require PCB layout redesign. Pin-to-pin compatibility must be verified against detailed datasheets before implementation.

Q: What is the maximum frequency limitation of the 840N202CKI-000LF substitute?

A: The 840N202CKI-000LF supports maximum frequency of 250MHz. Applications requiring frequencies between 250MHz and 350MHz cannot use this substitute and require alternative components.

Q: Are there supply voltage compatibility issues between these parts?

A: Both parts operate within overlapping supply voltage ranges. The 8402AYLF requires 3.135V ~ 3.465V, while the 840N202CKI-000LF accepts 2.375V ~ 3.465V. The substitute part provides broader low-voltage tolerance, allowing operation at lower supply voltages if required.

Q: Does the 840N202CKI-000LF support crystal input like the 8402AYLF?

A: Yes. The 840N202CKI-000LF supports crystal input along with additional input types (HCSL, LVDS, LVHSTL, LVPECL). Crystal-based operation is fully compatible with the original 8402AYLF configuration.

Q: What are the implications of the package change from 32-LQFP to 40-VFQFN?

A: Package transition requires PCB redesign for footprint accommodation. The 40-VFQFN Exposed Pad package provides improved thermal characteristics through the exposed pad feature. Pin count increases from 32 to 40, necessitating verification of all signal connections and ground plane integration.

Q: Is the 840N202CKI-000LF suitable for industrial temperature applications?

A: Yes. The 840N202CKI-000LF operates across -40°C ~ 85°C, extending below the 8402AYLF range of 0°C ~ 70°C. This broader temperature specification supports industrial and extended-temperature environments.

Q: What compliance advantages does the 840N202CKI-000LF provide?

A: The 840N202CKI-000LF is ROHS3 compliant and maintains active product status. Both parts share REACH Unaffected and EAR99 ECCN classifications. Active status ensures ongoing regulatory compliance and manufacturer support.