ECS-49-20-4 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-49-20-4 is a 4.9152 MHz through-hole crystal oscillator in HC-49/US package with 20pF load capacitance and 150 Ohms equivalent series resistance. This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Finding equivalent substitute parts is necessary for maintenance, repair, and legacy system support where this specific frequency and package configuration is required.

Substiute Parts

ECS-49-20-4

ECS Inc.In Stock: 1531ECS-49-20-4 Datasheet

Current PartRFQ

ECS-49-20-4X

ECS Inc.In Stock: 2963ECS-49-20-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ECS-49-20-4 is determined by strict equivalence across the following critical parameters:

• Frequency: 4.9152 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Load Capacitance: 20pF (exact match required)
• ESR: 150 Ohms (exact match required)
• Package / Case: HC-49/US (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -10°C ~ 70°C (exact match required)
• Operating Mode: Fundamental (exact match required)

The ECS-49-20-4X meets all these criteria and is therefore a valid parametric equivalent. The primary distinction between the main part and its substitute is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The ECS-49-20-4X is the direct parametric equivalent for the ECS-49-20-4. All electrical and mechanical specifications are identical. The ECS-49-20-4X offers the advantage of Active product status, indicating ongoing manufacturer support and availability. Additionally, the ECS-49-20-4X carries ROHS3 compliance, whereas the original part is RoHS non-compliant. Both parts maintain identical REACH and ECCN classifications.

For applications where RoHS compliance is required or preferred, the ECS-49-20-4X is the appropriate selection. For legacy systems requiring exact historical equivalence without compliance considerations, both parts are electrically and mechanically interchangeable.

Frequently Asked Questions (FAQ)

Q: Can the ECS-49-20-4X be used as a direct replacement for the ECS-49-20-4?

A: Yes. The ECS-49-20-4X is a parametric equivalent with identical frequency, load capacitance, ESR, package, and operating specifications. Both parts are pin-compatible and functionally equivalent in circuit applications.

Q: What is the primary difference between these two parts?

A: The main differences are product status and RoHS compliance. The ECS-49-20-4 is classified as Not For New Designs, while the ECS-49-20-4X is Active. The ECS-49-20-4X is ROHS3 compliant, whereas the original part is RoHS non-compliant.

Q: Are the physical dimensions identical?

A: Yes. Both parts use the HC-49/US package with identical dimensions: 0.447" L x 0.183" W (11.35mm x 4.65mm) and maximum seated height of 0.138" (4.60mm).

Q: Will the ECS-49-20-4X work in existing PCB designs for the ECS-49-20-4?

A: Yes. The through-hole mounting configuration, package footprint, and all electrical parameters are identical, making the ECS-49-20-4X a direct drop-in replacement.

Q: What does the "Not For New Designs" status mean?

A: This designation indicates the ECS-49-20-4 has been superseded and is no longer recommended for new product development. The ECS-49-20-4X is the active equivalent for new applications.

Q: Are there any compliance differences I should consider?

A: The ECS-49-20-4X is ROHS3 compliant, making it suitable for applications with RoHS requirements. Both parts are REACH Unaffected and classified as EAR99 for export purposes.