ECS-44-20-1 Crystal Oscillator Equivalent & Substitute Parts

Part Overview

The ECS-44-20-1 is a 4.433618 MHz through-hole crystal oscillator in HC-49/U package configuration, designed for fundamental mode operation with 20pF load capacitance and 70 Ohms equivalent series resistance. This part is classified as Not For New Designs, making identification of active equivalent alternatives essential for ongoing production and maintenance applications. The substitute part ECS-44-20-1X provides functional equivalence while maintaining active product status.

Substiute Parts

ECS-44-20-1

ECS Inc.In Stock: 1398ECS-44-20-1 Datasheet

Current PartRFQ

ECS-44-20-1X

ECS Inc.In Stock: 1688ECS-44-20-1X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ECS-44-20-1 with ECS-44-20-1X is based on strict equivalence across all critical electrical and mechanical parameters. Both parts share identical specifications for frequency (4.433618 MHz), frequency tolerance (±30ppm), load capacitance (20pF), ESR (70 Ohms), operating mode (Fundamental), temperature range (-10°C to 70°C), and physical package (HC-49/U through-hole). The substitute relationship is determined by matching these core parameters without deviation. The primary distinction between the parts is product lifecycle status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The ECS-44-20-1X serves as the direct functional equivalent to the ECS-44-20-1 for applications requiring 4.433618 MHz crystal oscillation with HC-49/U through-hole packaging. Selection between these parts should be based on product lifecycle requirements and regulatory compliance mandates. The ECS-44-20-1 is designated Not For New Designs, indicating it is retained for legacy system support and maintenance only. The ECS-44-20-1X maintains Active product status and carries ROHS3 compliance certification, making it the appropriate choice for new designs and applications subject to RoHS regulatory requirements. Both parts are electrically and mechanically interchangeable within circuits designed for the specified frequency, load capacitance, and ESR parameters.

Frequently Asked Questions (FAQ)

Q: What determines if ECS-44-20-1X can substitute for ECS-44-20-1?

A: Substitution is valid when all electrical parameters match: frequency (4.433618 MHz), frequency tolerance (±30ppm), load capacitance (20pF), ESR (70 Ohms), and operating mode (Fundamental). Both parts meet these criteria identically. Mechanical compatibility is confirmed through matching HC-49/U package, through-hole mounting, and physical dimensions.

Q: Are there any package or footprint differences between these parts?

A: No. Both ECS-44-20-1 and ECS-44-20-1X use identical HC-49/U packaging with through-hole mounting. Physical dimensions are 0.447" L x 0.183" W (11.35mm x 4.65mm) with maximum seated height of 0.530" (13.46mm). PCB footprints and mounting requirements are identical.

Q: Why is ECS-44-20-1 marked Not For New Designs?

A: This designation indicates the part is in end-of-life status and is retained for legacy system support and maintenance applications only. New designs should specify ECS-44-20-1X, which carries Active product status and current compliance certifications.

Q: What is the difference in RoHS compliance between these parts?

A: ECS-44-20-1 is RoHS non-compliant, while ECS-44-20-1X is ROHS3 compliant. For applications subject to RoHS regulatory requirements or customer specifications mandating RoHS compliance, ECS-44-20-1X is the required selection.

Q: Can I use ECS-44-20-1X in a circuit originally designed for ECS-44-20-1?

A: Yes. The parts are electrically and mechanically equivalent across all specified parameters. Direct substitution is valid for any application using the original ECS-44-20-1 part.