ECS-221-S-4 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-221-S-4 is a 22.1184 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, making identification of active equivalent components essential for ongoing production support and new design initiatives. The primary substitute maintains identical electrical and mechanical specifications while offering improved compliance and active product status.

Substiute Parts

ECS-221-S-4

ECS Inc.In Stock: 743ECS-221-S-4 Datasheet

Current PartRFQ

ECS-221-S-4X

ECS Inc.In Stock: 3692ECS-221-S-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-221-S-4 is determined by strict equivalence across the following parameters:

• Frequency: 22.1184 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• ESR: 30 Ohms (exact match required)
• Package / Case: HC-49/US (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-221-S-4X meets all substitution criteria as a parametric equivalent. The primary distinction lies in product lifecycle status and regulatory compliance, not electrical or mechanical performance.

Parameter Comparison

Engineering Selection Recommendations

The ECS-221-S-4X is the direct parametric equivalent for the ECS-221-S-4. Selection between these parts should be based on the following criteria:

For legacy system maintenance and repair where original part specifications are mandated, the ECS-221-S-4 remains available with 719 units in stock.

For new designs, production transitions, and systems requiring regulatory compliance, the ECS-221-S-4X is the appropriate selection. This part maintains identical electrical and mechanical performance while offering Active product status and ROHS3 compliance. Inventory availability is significantly higher at 3635 units.

Both parts are REACH Unaffected and classified under ECCN EAR99 with HTSUS code 8541.60.0060.

Frequently Asked Questions (FAQ)

Q: Can the ECS-221-S-4X be used as a direct replacement for the ECS-221-S-4 in existing designs?

A: Yes. The ECS-221-S-4X is a parametric equivalent with identical frequency, tolerance, ESR, package, and operating specifications. No circuit modifications are required for substitution.

Q: What is the significance of the "Not For New Designs" status on the ECS-221-S-4?

A: This designation indicates the part is in end-of-life phase. While available for existing applications, new designs should utilize the ECS-221-S-4X, which carries Active status and extended support.

Q: Are there differences in physical dimensions between these parts?

A: No. Both parts share identical dimensions: 0.447" L x 0.183" W (11.35mm x 4.65mm) with maximum seated height of 0.138" (4.60mm). They are mechanically interchangeable in HC-49/US footprints.

Q: What is the difference between the HC-49US and HC-49USX series designations?

A: The series designation reflects manufacturing variants. Both maintain identical electrical performance and package compatibility. The "X" variant in the ECS-221-S-4X indicates the newer production line with improved compliance certifications.

Q: Does the RoHS compliance difference affect circuit performance?

A: No. RoHS compliance relates to material composition and manufacturing processes, not electrical characteristics. Both parts deliver identical frequency stability, tolerance, and ESR performance.