ECS-221-S-1 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-221-S-1 is a 22.1184 MHz through-hole crystal oscillator in HC-49/U package configuration, designed for fundamental mode operation across industrial temperature ranges. This component is classified as Active product status with 905 units currently in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter set, enabling procurement flexibility and supply chain continuity.

Substiute Parts

ECS-221-S-1

ECS Inc.In Stock: 998ECS-221-S-1 Datasheet

Current PartRFQ

ECS-221-S-1X

ECS Inc.In Stock: 1124ECS-221-S-1X Datasheet

Parametric EquivalentRFQ

MP221

CTS-Frequency ControlsIn Stock: 1265MP221 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-221-S-1 is determined by strict alignment across the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 22.1184 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Package / Case: HC-49/U (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Mode: Fundamental (exact match required)

Allowable Variation Parameters:

• ESR (Equivalent Series Resistance): ±5 Ohms tolerance acceptable
• Operating Temperature Range: Equal or extended range acceptable
• Load Capacitance: Specification differences noted but do not preclude substitution when circuit design accommodates
• Series designation: May differ between manufacturers

Two substitute parts meet these criteria: ECS-221-S-1X (parametric equivalent from same manufacturer) and MP221 (direct manufacturer alternative from CTS-Frequency Controls).

Parameter Comparison

Engineering Selection Recommendations

ECS-221-S-1X (Parametric Equivalent): This part maintains identical electrical and mechanical specifications to the main part while offering ROHS3 compliance status. The series designation change from HC-49U to HC-49UX reflects manufacturing revision without altering functional performance. Selection is appropriate when regulatory compliance requirements mandate RoHS certification.

MP221 (Direct Manufacturer Alternative): This CTS-Frequency Controls part delivers equivalent frequency and tolerance specifications with extended operating temperature range (-20°C vs. -10°C minimum). ESR specification is 25 Ohms compared to 20 Ohms in the primary part, representing a 5 Ohm increase within acceptable substitution tolerance. ROHS3 compliance is provided. Selection is appropriate for applications requiring extended low-temperature operation or when CTS-sourced components are preferred for supply chain diversification.

Both substitute parts carry Active product status and demonstrate superior inventory availability relative to the primary part.

Frequently Asked Questions (FAQ)

Q: Can ECS-221-S-1X be used as a direct drop-in replacement for ECS-221-S-1?

A: Yes. Both parts share identical frequency (22.1184 MHz), tolerance (±30ppm), ESR (20 Ohms), package (HC-49/U), and operating temperature range (-10°C ~ 70°C). The series designation change reflects internal manufacturing revision without affecting electrical or mechanical compatibility.

Q: What is the significance of the 5 Ohm ESR difference in MP221?

A: MP221 specifies 25 Ohms ESR versus 20 Ohms in the primary part. This 5 Ohm variance falls within acceptable substitution tolerance for HC-49/U crystals and does not compromise frequency stability or load characteristics when circuit design accommodates standard ESR specifications for this package class.

Q: Does the extended temperature range of MP221 (-20°C ~ 70°C) provide additional functionality?

A: The extended low-temperature specification of MP221 provides operational margin below the primary part's -10°C minimum. Selection of MP221 is appropriate only when circuit operation below -10°C is required. For applications limited to -10°C ~ 70°C, this specification difference is not operationally relevant.

Q: Are all substitute parts RoHS compliant?

A: ECS-221-S-1X and MP221 both carry ROHS3 compliance certification. The primary part ECS-221-S-1 is classified as RoHS non-compliant. Regulatory requirements may mandate selection of compliant alternatives.

Q: How do load capacitance specifications affect substitution?

A: ECS-221-S-1 and ECS-221-S-1X specify load capacitance as "Series" configuration. MP221 specifies 20pF load capacitance. These differences reflect manufacturer specification methodology and do not preclude substitution when circuit design accommodates standard load capacitance values for HC-49/U crystals at this frequency.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All three parts share identical HC-49/U package dimensions and through-hole mounting configuration. Physical PCB footprints and component placement require no modification for substitution.