ECS-51-S-1X Crystal Equivalent & Substitute Parts

Part Overview

The ECS-51-S-1X is a 5.068 MHz through-hole crystal oscillator in HC-49/U package configuration, designed for fundamental mode operation with 50 Ohms equivalent series resistance. This component is classified as Active product status and is ROHS3 compliant. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across frequency, tolerance, package type, and mounting specifications. The ECS-51-S-1 represents a parametric equivalent option with differing compliance and product lifecycle status.

Substiute Parts

ECS-51-S-1X

ECS Inc.In Stock: 936ECS-51-S-1X Datasheet

Current PartRFQ

ECS-51-S-1

ECS Inc.In Stock: 864ECS-51-S-1 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-51-S-1X is determined by strict equivalence across the following parameters:

• Frequency: 5.068 MHz (exact match required)
• Frequency Tolerance: ±30 ppm (exact match required)
• ESR: 50 Ohms (exact match required)
• Package / Case: HC-49/U (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -10°C to 70°C (exact match required)
• Operating Mode: Fundamental (exact match required)

The ECS-51-S-1 meets all electrical and mechanical equivalence criteria. Differences in product status, RoHS compliance, and series designation (HC-49U vs. HC-49UX) do not affect functional interchangeability within the specified parameter set.

Parameter Comparison

Engineering Selection Recommendations

The ECS-51-S-1X is the preferred selection for new designs due to Active product status and ROHS3 compliance certification. The ECS-51-S-1 is electrically and mechanically equivalent but carries Not For New Designs status and does not meet RoHS3 requirements. Selection between these parts depends on application constraints:

• For new product development: ECS-51-S-1X is the appropriate choice.
• For legacy system maintenance or replacement in existing designs: ECS-51-S-1 provides functional equivalence where RoHS compliance is not a requirement.
• Both parts maintain identical electrical performance within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can ECS-51-S-1 be used as a direct replacement for ECS-51-S-1X in new designs?

A: Electrically and mechanically, yes. However, ECS-51-S-1 carries Not For New Designs status and is RoHS non-compliant. New designs should specify ECS-51-S-1X.

Q: Are there differences in frequency accuracy between these parts?

A: No. Both parts maintain identical frequency tolerance (±30 ppm) and frequency stability (±50 ppm) specifications.

Q: Do these parts have identical physical dimensions?

A: Yes. Both parts are HC-49/U package with identical dimensions: 0.447" L x 0.183" W (11.35mm x 4.65mm) and maximum seated height of 0.530" (13.46mm).

Q: What is the significance of the series designation difference (HC-49UX vs. HC-49U)?

A: Both designations refer to HC-49/U package configuration. The series designation reflects manufacturing variants but does not affect electrical or mechanical interchangeability within the specified parameter set.

Q: Are both parts suitable for the same operating temperature range?

A: Yes. Both parts operate across -10°C to 70°C with identical specifications.

Q: What compliance certifications differ between these parts?

A: ECS-51-S-1X is ROHS3 compliant; ECS-51-S-1 is RoHS non-compliant. Both are REACH Unaffected and classified as EAR99 for export control purposes.