FOX465 Equivalent & Substitute Parts

Part Overview

The FOX465 is a 32.768 kHz crystal oscillator manufactured by Fox Electronics, designed for applications requiring a standard XO (crystal oscillator) with HCMOS output, 3.3V supply, and enable/disable functionality in a compact 4-SMD surface mount package. The FOX465 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support and new design implementations.

Substiute Parts

FOX465

Fox ElectronicsIn Stock: 1141FOX465 Datasheet

Current PartRFQ

ASFLK-32.768KHZ-LJT

Abracon LLCIn Stock: 2659ASFLK-32.768KHZ-LJT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FOX465 is determined by the following critical parameters that must remain consistent:

• Frequency: 32.768 kHz (exact match required)
• Supply Voltage: 3.3V (exact match required)
• Package Type: 4-SMD, No Lead (mechanical compatibility)
• Function: Enable/Disable capability (functional requirement)
• Operating Temperature Range: -40°C ~ 85°C (environmental compatibility)

The ASFLK-32.768KHZ-LJT from Abracon LLC meets these core substitution criteria. While the output type differs (TTL vs. HCMOS), both are logic-level outputs compatible with 3.3V systems. The substitute part demonstrates superior frequency stability (±20ppm vs. -150ppm/+30ppm) and lower supply current (1mA vs. 5µA), making it functionally suitable for the FOX465 application space.

Parameter Comparison

Engineering Selection Recommendations

The ASFLK-32.768KHZ-LJT is the primary substitute for the obsolete FOX465. Selection is justified on the following basis:

• Product Status: The FOX465 is obsolete, while the ASFLK-32.768KHZ-LJT is active and in production, ensuring long-term availability and supply chain continuity.
• Regulatory Compliance: Both parts maintain REACH Unaffected status and EAR99 classification, ensuring equivalent regulatory standing.
• RoHS Compliance: The ASFLK-32.768KHZ-LJT is ROHS3 compliant, meeting modern environmental standards.
• Functional Equivalence: Identical frequency, supply voltage, enable/disable function, and operating temperature range ensure direct functional replacement.
• Physical Compatibility: Both parts use 4-SMD, No Lead packaging with identical pin configurations, allowing PCB-level substitution with minimal or no layout modification.

The ASFLK-32.768KHZ-LJT offers improved performance characteristics (tighter frequency stability and lower supply current) compared to the FOX465, making it suitable for both legacy system support and new designs.

Frequently Asked Questions (FAQ)

Q: Can the ASFLK-32.768KHZ-LJT directly replace the FOX465 on existing PCBs?

A: Yes. Both parts use identical 4-SMD, No Lead packaging with the same pin configuration. The ASFLK-32.768KHZ-LJT is physically smaller (5.00mm x 3.20mm vs. 6.50mm x 4.00mm) and lower profile (1.30mm vs. 2.00mm), allowing direct substitution without PCB redesign.

Q: What is the difference between HCMOS and TTL output types?

A: Both are logic-level outputs compatible with 3.3V systems. HCMOS (High-speed CMOS) and TTL (Transistor-Transistor Logic) differ in output impedance and drive capability, but both are suitable for clock distribution in 3.3V digital circuits. The ASFLK-32.768KHZ-LJT TTL output is functionally compatible with systems designed for the FOX465 HCMOS output.

Q: Does the improved frequency stability of the ASFLK-32.768KHZ-LJT affect compatibility?

A: No. Tighter frequency stability (±20ppm vs. -150ppm/+30ppm) is a performance improvement that enhances system accuracy without introducing compatibility issues. Systems designed for the FOX465 tolerance will operate within specification with the ASFLK-32.768KHZ-LJT.

Q: Are there any supply chain or availability differences?

A: The FOX465 is obsolete with no ongoing production. The ASFLK-32.768KHZ-LJT is an active product with 2636 units in stock, ensuring reliable availability for both immediate requirements and long-term production needs.

Q: What is the Moisture Sensitivity Level (MSL) significance?

A: Both parts carry MSL 1 (Unlimited), indicating no moisture sensitivity constraints. These parts can be stored indefinitely without desiccant packaging and do not require special handling during assembly.