ECS-35-S-1 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-35-S-1 is a 4.679545 MHz through-hole crystal oscillator in HC-49/U package configuration, designed for fundamental mode operation with 120 Ohms equivalent series resistance. This part is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Identifying equivalent substitute parts is necessary for legacy system maintenance, repair operations, and applications where continued supply of the original component is limited.

Substiute Parts

ECS-35-S-1

ECS Inc.In Stock: 847ECS-35-S-1 Datasheet

Current PartRFQ

ECS-35-S-1X

ECS Inc.In Stock: 1242ECS-35-S-1X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-35-S-1 is determined by strict equivalence across the following critical parameters:

• Frequency: 4.679545 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• ESR: 120 Ohms (exact match required)
• Package / Case: HC-49/U (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Mode: Fundamental (exact match required)
• Operating Temperature Range: -10°C ~ 70°C (exact match required)

The ECS-35-S-1X meets all substitution criteria as a parametric equivalent. Differences in product status, RoHS compliance, and series designation (HC-49UX vs. HC-49U) do not affect electrical or mechanical compatibility in applications where the original part was specified.

Parameter Comparison

Engineering Selection Recommendations

The ECS-35-S-1X is the direct parametric equivalent for the ECS-35-S-1. All electrical and mechanical specifications are identical, ensuring functional compatibility in existing circuit designs.

The primary distinction is product lifecycle status: the ECS-35-S-1 is designated Not For New Designs, while the ECS-35-S-1X carries Active status. For legacy system repairs and maintenance applications, the ECS-35-S-1X provides continued supply assurance from the same manufacturer.

The ECS-35-S-1X offers improved compliance posture with ROHS3 certification, whereas the original part is RoHS non-compliant. This distinction is relevant for applications subject to regulatory compliance requirements but does not affect electrical performance or circuit operation.

Frequently Asked Questions (FAQ)

Q: Can the ECS-35-S-1X be used as a direct replacement for the ECS-35-S-1?

A: Yes. The ECS-35-S-1X is a parametric equivalent with identical frequency, tolerance, ESR, package, and operating specifications. Direct substitution is supported without circuit modification.

Q: Are there any physical differences between these parts?

A: No. Both parts share identical dimensions (0.447" L x 0.183" W, 11.35mm x 4.65mm) and maximum seated height (0.530" / 13.46mm). HC-49/U package compatibility is maintained.

Q: What is the significance of the series designation change from HC-49U to HC-49UX?

A: The series designation reflects the manufacturer's product line evolution. The HC-49UX designation indicates the updated version with Active product status and improved compliance. Electrical and mechanical compatibility remains unchanged.

Q: Does the RoHS compliance difference affect circuit performance?

A: No. RoHS compliance status reflects manufacturing process and material composition but does not alter electrical characteristics, frequency accuracy, or operating behavior in the circuit.

Q: Is the ECS-35-S-1X suitable for new designs?

A: Yes. The ECS-35-S-1X carries Active product status and is appropriate for new design implementations. The original ECS-35-S-1 is Not For New Designs and should not be specified for new applications.