ECS-18-S-1 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-18-S-1 is a 1.8432 MHz through-hole crystal oscillator in HC-49/U package with 750 Ohms equivalent series resistance (ESR). This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Finding equivalent or substitute parts is necessary for maintenance, repair, and legacy system support where this specific frequency and package type are required.

Substiute Parts

ECS-18-S-1

ECS Inc.In Stock: 1040ECS-18-S-1 Datasheet

Current PartRFQ

ECS-18-S-1X

ECS Inc.In Stock: 1807ECS-18-S-1X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ECS-18-S-1 is determined by the following critical parameters:

• Frequency: Must be 1.8432 MHz
• Frequency Tolerance: Must be ±30ppm
• ESR: Must be 750 Ohms
• Operating Mode: Must be Fundamental
• Load Capacitance: Must be Series
• Package / Case: Must be HC-49/U
• Operating Temperature Range: Must be -10°C ~ 70°C
• Mounting Type: Must be Through Hole

The ECS-18-S-1X meets all these criteria and is therefore a direct parametric equivalent. The primary distinction is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The ECS-18-S-1X is the direct substitute for the ECS-18-S-1. Both parts are manufactured by ECS Inc. and share identical electrical and mechanical specifications. The ECS-18-S-1X is preferred for new applications and ongoing production because it carries Active product status and is ROHS3 compliant, whereas the ECS-18-S-1 is marked "Not For New Designs" and is RoHS non-compliant. For legacy system maintenance where the original ECS-18-S-1 is no longer available, the ECS-18-S-1X provides full functional and physical compatibility without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the ECS-18-S-1X be used as a direct replacement for the ECS-18-S-1?

A: Yes. Both parts have identical frequency (1.8432 MHz), frequency tolerance (±30ppm), ESR (750 Ohms), operating mode (Fundamental), load capacitance (Series), package (HC-49/U), and operating temperature range (-10°C ~ 70°C). Physical dimensions and mounting type are also identical, allowing direct substitution without PCB modification.

Q: What is the difference between the ECS-18-S-1 and ECS-18-S-1X?

A: The primary differences are product status and compliance. The ECS-18-S-1 is marked "Not For New Designs" and is RoHS non-compliant. The ECS-18-S-1X is Active and ROHS3 compliant. The series designation differs slightly (HC-49U vs. HC-49UX), but electrical and mechanical parameters are identical.

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

A: No. Both parts use the HC-49/U package with identical dimensions: 0.447" L x 0.183" W (11.35mm x 4.65mm) and maximum seated height of 0.530" (13.46mm). They are through-hole components with identical PCB footprints.

Q: Why is the ECS-18-S-1 marked "Not For New Designs"?

A: This designation indicates the part has been superseded in the manufacturer's product line. The ECS-18-S-1X is the active replacement. For new designs and ongoing production, the ECS-18-S-1X should be specified.

Q: Is the ECS-18-S-1X available in higher volumes?

A: Yes. The ECS-18-S-1X has 1708 pieces in stock compared to 997 pieces for the ECS-18-S-1, indicating it is the current production part.