ECS-44-20-4 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-44-20-4 is a 4.433618 MHz through-hole crystal oscillator in HC-49/US package configuration, designed for fundamental mode operation with 20pF load capacitance and 150 Ohms equivalent series resistance. This component is classified as Active product status and is currently in stock inventory. Alternative part sourcing becomes necessary due to component availability fluctuations, supply chain constraints, or compliance requirement alignment with specific manufacturing standards.

Substiute Parts

ECS-44-20-4

ECS Inc.In Stock: 1158ECS-44-20-4 Datasheet

Current PartRFQ

ECS-44-20-4X

ECS Inc.In Stock: 988ECS-44-20-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-44-20-4 is determined by strict equivalence across the following critical parameters:

• Frequency: 4.433618 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Load Capacitance: 20pF (exact match required)
• ESR: 150 Ohms (exact match required)
• Operating Mode: Fundamental (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)

The ECS-44-20-4X qualifies as a parametric equivalent substitute because all electrical and mechanical specifications align precisely with these criteria. Series designation differences (HC-49US versus HC-49USX) reflect manufacturing line variations within the same package family and do not affect functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both ECS-44-20-4 and ECS-44-20-4X are Active status components with identical electrical and mechanical specifications. Selection between these parts should be based on compliance requirements:

The ECS-44-20-4X is ROHS3 compliant, whereas the ECS-44-20-4 is RoHS non-compliant. For applications subject to RoHS3 regulatory requirements or customer specifications mandating RoHS compliance, the ECS-44-20-4X is the appropriate selection. Both parts maintain identical REACH Unaffected status and EAR99 export classification.

Current inventory levels are 1135 units for ECS-44-20-4 and 965 units for ECS-44-20-4X, supporting both sourcing options.

Frequently Asked Questions (FAQ)

Q: Can ECS-44-20-4X be used as a direct replacement for ECS-44-20-4 in existing designs?

A: Yes. All electrical parameters (frequency, tolerance, load capacitance, ESR, operating mode) and mechanical specifications (package, mounting type, dimensions, temperature range) are identical. Direct substitution is electrically and mechanically compatible.

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

A: Series designation reflects manufacturing line classification within the same HC-49/US package family. Both designations represent the identical physical package and electrical performance specifications.

Q: Should I select ECS-44-20-4X over ECS-44-20-4 for new designs?

A: Selection depends on compliance requirements. The ECS-44-20-4X offers ROHS3 compliance, which may be required by regulatory standards or customer specifications. The ECS-44-20-4 is RoHS non-compliant. For applications without RoHS compliance mandates, either part is functionally equivalent.

Q: Are there any temperature or frequency stability differences between these parts?

A: No. Both parts operate across -10°C to 70°C temperature range with identical ±50ppm frequency stability and ±30ppm frequency tolerance specifications.

Q: What is the moisture sensitivity level for both parts?

A: Both ECS-44-20-4 and ECS-44-20-4X are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.