ECS-100-S-4 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-100-S-4 is a 10 MHz through-hole crystal oscillator in HC-49/US package configuration, designed for fundamental mode operation with 60 Ohms equivalent series resistance. This part carries a "Not For New Designs" status, making identification of active equivalent alternatives essential for ongoing production and new circuit implementations. The primary substitute maintains identical electrical and mechanical specifications while offering improved compliance status.

Substiute Parts

ECS-100-S-4

ECS Inc.In Stock: 2339ECS-100-S-4 Datasheet

Current PartRFQ

ECS-100-S-4X

ECS Inc.In Stock: 2451ECS-100-S-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-100-S-4 is determined by strict equivalence across the following critical parameters:

• Frequency: 10 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Frequency Stability: ±50ppm (exact match required)
• ESR: 60 Ohms (exact match required)
• Operating Mode: Fundamental (exact match required)
• Load Capacitance: Series (exact match required)
• Operating Temperature Range: -10°C ~ 70°C (exact match required)
• Package / Case: HC-49/US (exact match required)
• Physical Dimensions: 0.447" L x 0.183" W, Height 0.138" max (exact match required)
• Mounting Type: Through Hole (exact match required)
• MSL Rating: 1 (Unlimited) (exact match required)

The ECS-100-S-4X meets all substitution criteria as a parametric equivalent with identical electrical performance and mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The ECS-100-S-4X is the direct parametric equivalent for the ECS-100-S-4. Selection between these parts should be based on the following factors:

For New Designs: Use ECS-100-S-4X. This part carries Active product status and ROHS3 compliance, making it suitable for new circuit implementations and future production runs.

For Legacy System Maintenance: Either part is electrically and mechanically interchangeable. The ECS-100-S-4X is preferred due to its Active status and improved regulatory compliance.

Compliance Considerations: The ECS-100-S-4X provides ROHS3 compliance, whereas the ECS-100-S-4 is RoHS non-compliant. Both parts maintain REACH Unaffected status and EAR99 export classification.

Inventory and Availability: Both parts are available in bulk packaging with comparable stock levels (2313 Pcs for ECS-100-S-4; 2344 Pcs for ECS-100-S-4X).

Frequently Asked Questions (FAQ)

Q: Can ECS-100-S-4X be used as a direct replacement for ECS-100-S-4 in existing circuits?

A: Yes. The ECS-100-S-4X is a parametric equivalent with identical frequency, tolerance, stability, ESR, operating temperature range, and physical dimensions. No circuit modifications are required for substitution.

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

A: Both designations refer to the HC-49/US package form factor. The series designation reflects manufacturing variants within the same package standard. Electrical and mechanical specifications remain identical.

Q: Are there any compliance differences between these parts?

A: Yes. The ECS-100-S-4X is ROHS3 compliant, while the ECS-100-S-4 is RoHS non-compliant. Both maintain REACH Unaffected status. For applications subject to RoHS regulations, the ECS-100-S-4X is the appropriate selection.

Q: Why is the ECS-100-S-4 marked "Not For New Designs"?

A: This designation indicates the part is in mature or end-of-life status. The ECS-100-S-4X provides an active alternative with identical performance characteristics and improved compliance status.

Q: Do these crystals require any special handling or storage considerations?

A: Both parts carry MSL Rating 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard electronic component storage practices apply.

Q: Are the physical dimensions identical between both parts?

A: Yes. Both parts measure 0.447" L x 0.183" W (11.35mm x 4.65mm) with a maximum seated height of 0.138" (4.60mm). PCB footprints and mechanical clearances are identical.