4P143F35IST Crystal Oscillator - Equivalent & Substitute Parts

Part Overview

The 4P143F35IST is a 14.31818 MHz crystal oscillator manufactured by CTS-Frequency Controls, designed for surface mount applications in the HC-49/US package. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing production support and design continuity. The crystal operates at fundamental mode with ±30ppm frequency tolerance and 40 Ohms equivalent series resistance, suitable for applications requiring precise timing at this frequency.

Substiute Parts

4P143F35IST

CTS-Frequency ControlsIn Stock: 7384P143F35IST Datasheet

Current PartRFQ

445I35S14M31818

CTS-Frequency ControlsIn Stock: 748445I35S14M31818 Datasheet

SimilarRFQ

ATS143-E

CTS-Frequency ControlsIn Stock: 723ATS143-E Datasheet

SimilarRFQ

ATS143SM-1E

CTS-Frequency ControlsIn Stock: 899ATS143SM-1E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 4P143F35IST is determined by the following critical parameters:

• Frequency Match: All substitute parts must operate at 14.31818 MHz
• Frequency Tolerance: ±30ppm tolerance is required for functional equivalence
• Frequency Stability: ±50ppm specification must be maintained
• Operating Temperature Range: -40°C to 85°C operational window
• Load Capacitance: Series load capacitance configuration
• Operating Mode: Fundamental mode operation

The substitute parts are grouped into two categories based on mounting type compatibility:

1. Surface Mount Substitutes (445I35S14M31818, ATS143SM-1E): Direct mechanical and electrical replacements for SMD applications
2. Through Hole Substitute (ATS143-E): Alternative for designs permitting through-hole mounting

All substitutes maintain identical electrical specifications while differing in package form factor and product status.

Parameter Comparison

Engineering Selection Recommendations

For Surface Mount Applications with HC-49/US Package Requirement:

ATS143SM-1E is the primary substitute for the 4P143F35IST. Both parts maintain identical electrical specifications (40 Ohms ESR, ±30ppm tolerance, ±50ppm stability) and package form factor. ATS143SM-1E carries active product status with ROHS3 compliance and REACH unaffected certification, ensuring long-term availability and regulatory alignment.

For Surface Mount Applications with Compact Package Preference:

445I35S14M31818 provides an alternative surface mount solution in a smaller 2-SMD, No Lead package (5.00mm x 3.20mm). This part maintains all electrical specifications with the exception of ESR (50 Ohms versus 40 Ohms). The reduced package size may require circuit board layout modifications. This part is active and ROHS3 compliant.

For Through Hole Applications:

ATS143-E serves applications where through-hole mounting is acceptable. It maintains identical electrical specifications and HC-49/US package dimensions as the original part, with active product status and full compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can 445I35S14M31818 be used as a direct replacement for 4P143F35IST?

A: 445I35S14M31818 is electrically compatible with the exception of ESR specification (50 Ohms versus 40 Ohms). The different package form factor (2-SMD, No Lead versus HC-49/US) requires circuit board layout modification. Mechanical compatibility is not direct.

Q: What is the primary difference between ATS143SM-1E and 4P143F35IST?

A: Both parts are electrically and mechanically identical. The primary difference is product status: 4P143F35IST is obsolete while ATS143SM-1E is active. ATS143SM-1E includes ROHS3 compliance certification.

Q: Is ATS143-E suitable for surface mount assembly?

A: ATS143-E is specified as a through-hole component. While the HC-49/US package can be surface mounted with appropriate footprint design, this part is classified as through-hole mounting type and may not be optimized for automated SMD assembly processes.

Q: Do all substitute parts operate within the same temperature range?

A: Yes. All substitute parts operate across the -40°C to 85°C temperature range with identical ±50ppm frequency stability specification.

Q: What compliance certifications apply to the substitute parts?

A: ATS143SM-1E and ATS143-E both carry ROHS3 compliance and REACH unaffected status. 445I35S14M31818 is ROHS3 compliant with REACH unaffected status. The original 4P143F35IST compliance status is not specified in available documentation.