ECS-184-20-1 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-184-20-1 is an 18.432 MHz through-hole crystal oscillator in HC-49/U package with 20pF load capacitance and 20 Ohms equivalent series resistance. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original specification must be maintained or where compatible alternatives with improved availability or compliance status are required.

Substiute Parts

ECS-184-20-1

ECS Inc.In Stock: 1350ECS-184-20-1 Datasheet

Current PartRFQ

ECS-184-18-1

ECS Inc.In Stock: 1058ECS-184-18-1 Datasheet

SimilarRFQ

ECS-184-18-1X

ECS Inc.In Stock: 1308ECS-184-18-1X Datasheet

SimilarRFQ

ECS-184-20-1X

ECS Inc.In Stock: 2229ECS-184-20-1X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-184-20-1 is determined by the following critical parameters:

Mandatory Match Parameters:

• Frequency: 18.432 MHz
• Frequency Tolerance: ±30ppm
• ESR: 20 Ohms
• Operating Mode: Fundamental
• Package / Case: HC-49/U
• Mounting Type: Through Hole
• Operating Temperature Range: -10°C ~ 70°C

Allowable Variation Parameters:

• Load Capacitance: 18pF or 20pF (within circuit design tolerance)
• Series Designation: HC-49U or HC-49UX (same physical package, different compliance status)
• RoHS Status: Non-compliant or ROHS3 Compliant (depends on application requirements)

Substitute parts are grouped into two categories:

1. Direct Load Capacitance Match (20pF): ECS-184-20-1X — identical electrical specifications with improved RoHS3 compliance and active product status.

2. Alternative Load Capacitance (18pF): ECS-184-18-1 and ECS-184-18-1X — functionally equivalent with 18pF load capacitance instead of 20pF, suitable for circuits designed to accommodate this variation.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Load Capacitance):

ECS-184-20-1X is the primary substitute for ECS-184-20-1. Both parts maintain 20pF load capacitance and identical electrical specifications. ECS-184-20-1X offers the advantage of active product status and ROHS3 compliance, making it suitable for new production runs and systems with RoHS requirements. The HC-49UX series designation indicates improved manufacturing standards compared to the HC-49U series.

For Load Capacitance Flexibility:

ECS-184-18-1 and ECS-184-18-1X are suitable substitutes when circuit design permits 18pF load capacitance operation. Both maintain all other critical parameters. ECS-184-18-1X provides ROHS3 compliance and active status. Selection between 18pF and 20pF variants depends on the specific oscillator circuit design and load capacitance tolerance specifications.

Compliance Considerations:

If RoHS3 compliance is required, select ECS-184-20-1X (20pF) or ECS-184-18-1X (18pF). Both are ROHS3 compliant and active products. If legacy RoHS non-compliant parts are acceptable, ECS-184-18-1 remains available with active status.

Frequently Asked Questions (FAQ)

Q: Can ECS-184-18-1 or ECS-184-18-1X be used as a direct replacement for ECS-184-20-1?

A: ECS-184-18-1 and ECS-184-18-1X are electrically equivalent in all parameters except load capacitance (18pF vs. 20pF). Substitution is possible only if the circuit design accommodates 18pF load capacitance. Verify the oscillator circuit specifications before substitution.

Q: What is the difference between HC-49U and HC-49UX series?

A: Both series use the same HC-49/U physical package with identical dimensions and mounting characteristics. HC-49UX represents an improved manufacturing standard with ROHS3 compliance. The package footprint and electrical performance are equivalent.

Q: Is ECS-184-20-1X a direct equivalent to ECS-184-20-1?

A: Yes. ECS-184-20-1X maintains identical electrical specifications including 20pF load capacitance, 18.432 MHz frequency, ±30ppm tolerance, and 20 Ohms ESR. The primary differences are active product status and ROHS3 compliance.

Q: Why is ECS-184-20-1 marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status. For new designs and ongoing production, use ECS-184-20-1X or equivalent active alternatives.

Q: Are all substitute parts available in the same through-hole package?

A: Yes. All listed substitutes use HC-49/U through-hole package with identical physical dimensions (0.447" L x 0.183" W, 0.530" max height seated).

Q: What is the impact of load capacitance difference on circuit operation?

A: Load capacitance affects the oscillation frequency and circuit stability. The 2pF difference between 20pF and 18pF variants may require circuit tuning adjustments. Consult the oscillator circuit design specifications to determine acceptable load capacitance range.