ECS-73-S-4 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-73-S-4 is a 7.3728 MHz through-hole crystal oscillator in HC-49/US package configuration, designed for fundamental mode operation across industrial temperature ranges. This part carries a "Not For New Designs" status, indicating it has been superseded in the manufacturer's product line. Identifying equivalent substitute parts is necessary for ongoing maintenance, repair, and legacy system support where this frequency and package type remain functionally required.

Substiute Parts

ECS-73-S-4

ECS Inc.In Stock: 1052ECS-73-S-4 Datasheet

Current PartRFQ

ECS-73-S-4X

ECS Inc.In Stock: 1361ECS-73-S-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-73-S-4 is determined by strict parametric matching across the following critical criteria:

• Frequency Match: 7.3728 MHz (exact)
• Frequency Tolerance: ±30ppm (exact)
• Frequency Stability: ±50ppm (exact)
• ESR: 80 Ohms (exact)
• Operating Mode: Fundamental (exact)
• Package / Case: HC-49/US (exact)
• Mounting Type: Through Hole (exact)
• Operating Temperature Range: -10°C ~ 70°C (exact)
• Load Capacitance: Series (exact)
• Physical Dimensions: 0.447" L x 0.183" W; Height 0.138" max (exact)

The ECS-73-S-4X meets all parametric requirements for direct substitution. Both parts share identical electrical specifications, mechanical dimensions, and functional characteristics. The primary distinction lies in product lifecycle status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The ECS-73-S-4X is the direct parametric equivalent for the ECS-73-S-4. All electrical and mechanical specifications are identical, ensuring functional interchangeability in circuit applications.

The ECS-73-S-4X carries Active product status, whereas the ECS-73-S-4 is designated Not For New Designs. For applications requiring ongoing component availability and manufacturer support, the ECS-73-S-4X is the appropriate selection.

The ECS-73-S-4X achieves ROHS3 compliance, compared to the non-compliant status of the ECS-73-S-4. Both parts maintain REACH Unaffected status and EAR99 export classification. Selection between these parts should be based on compliance requirements and supply chain continuity needs.

Frequently Asked Questions (FAQ)

Q: Can the ECS-73-S-4X be used as a direct replacement for the ECS-73-S-4?

A: Yes. The ECS-73-S-4X meets all parametric requirements for direct substitution. Frequency, tolerance, ESR, operating mode, package type, mounting configuration, temperature range, and physical dimensions are identical across both parts.

Q: What is the difference between the ECS-73-S-4 and ECS-73-S-4X?

A: The primary differences are product lifecycle status and RoHS compliance. The ECS-73-S-4 is marked Not For New Designs and is RoHS non-compliant. The ECS-73-S-4X is Active and ROHS3 compliant. Electrical and mechanical specifications are identical.

Q: Are there any compatibility concerns when substituting the ECS-73-S-4X for the ECS-73-S-4?

A: No compatibility concerns exist. Both parts use the HC-49/US package with identical dimensions and through-hole mounting. Circuit board layouts, footprints, and electrical performance remain unchanged.

Q: Why is the ECS-73-S-4 marked "Not For New Designs"?

A: This designation indicates the manufacturer has superseded this part in their product line. The ECS-73-S-4X represents the current active equivalent. For new designs and ongoing production, the ECS-73-S-4X is the recommended selection.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance relates to material composition and environmental standards, not electrical characteristics. Both the ECS-73-S-4 and ECS-73-S-4X deliver identical frequency, stability, and ESR performance.