ECS-143-S-4 Equivalent & Substitute Parts

Part Overview

The ECS-143-S-4 is a 14.31818 MHz through-hole crystal oscillator in HC-49/US package with 40 Ohms equivalent series resistance (ESR) and ±30ppm frequency tolerance. This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Finding equivalent substitute parts is necessary for maintenance, repair, and legacy system support where this specific frequency and package configuration is required.

Substiute Parts

ECS-143-S-4

ECS Inc.In Stock: 2735ECS-143-S-4 Datasheet

Current PartRFQ

ECS-143-S-4X

ECS Inc.In Stock: 1384ECS-143-S-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-143-S-4 is determined by strict equivalence across the following critical parameters:

• Frequency: 14.31818 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• ESR: 40 Ohms (exact match required)
• Package / Case: HC-49/US (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -10°C ~ 70°C (exact match required)
• Operating Mode: Fundamental (exact match required)

The ECS-143-S-4X meets all substitution criteria as a parametric equivalent. While the series designation differs (HC-49USX vs. HC-49US) and product status differs (Active vs. Not For New Designs), the electrical and mechanical specifications remain identical, making it a direct functional substitute.

Parameter Comparison

Engineering Selection Recommendations

The ECS-143-S-4X is the direct parametric equivalent for the ECS-143-S-4. Both parts share identical electrical and mechanical specifications across all critical substitution parameters. The primary distinction is product lifecycle status: the ECS-143-S-4 is designated Not For New Designs, while the ECS-143-S-4X maintains Active status in the manufacturer's current product line.

An additional consideration is regulatory compliance: the ECS-143-S-4X is ROHS3 Compliant, whereas the ECS-143-S-4 is RoHS non-compliant. For applications subject to RoHS requirements, the ECS-143-S-4X is the appropriate selection. For legacy system maintenance where RoHS compliance is not a constraint, either part is functionally interchangeable.

Frequently Asked Questions (FAQ)

Q: Can the ECS-143-S-4X be used as a direct replacement for the ECS-143-S-4?

A: Yes. The ECS-143-S-4X is a parametric equivalent with identical frequency (14.31818 MHz), frequency tolerance (±30ppm), ESR (40 Ohms), package (HC-49/US), and operating specifications. No circuit modifications are required for substitution.

Q: What is the difference between the ECS-143-S-4 and ECS-143-S-4X?

A: The parts are electrically and mechanically identical. The differences are: (1) Product status—ECS-143-S-4 is Not For New Designs while ECS-143-S-4X is Active; (2) Series designation—HC-49US versus HC-49USX; (3) RoHS compliance—ECS-143-S-4X is ROHS3 Compliant while ECS-143-S-4 is non-compliant.

Q: Are there any package or mounting differences between these parts?

A: No. Both parts use the HC-49/US through-hole package with identical dimensions (0.447" L x 0.183" W, 11.35mm x 4.65mm) and maximum seated height (0.138" / 4.60mm).

Q: Which part should I select for new designs?

A: The ECS-143-S-4X should be selected for new designs, as it carries Active product status and ROHS3 compliance. The ECS-143-S-4 is designated Not For New Designs.

Q: Are the frequency tolerance and stability specifications the same?

A: Yes. Both parts have identical frequency tolerance (±30ppm) and frequency stability (±50ppm) specifications.