ECS-180-20-1 18 MHz Crystal Equivalent & Substitute Parts

Part Overview

The ECS-180-20-1 is an 18 MHz through-hole crystal oscillator in HC-49/U package with 20pF load capacitance and 20 Ohms ESR. This part is classified as "Not For New Designs," making identification of active equivalent alternatives essential for ongoing production and maintenance applications. Substitute parts must maintain identical frequency, load capacitance, and fundamental operating mode specifications while accommodating variations in package configuration and ESR characteristics.

Substiute Parts

ECS-180-20-1

ECS Inc.In Stock: 1129ECS-180-20-1 Datasheet

Current PartRFQ

ECS-180-20-4

ECS Inc.In Stock: 665ECS-180-20-4 Datasheet

SimilarRFQ

ECS-180-20-1X

ECS Inc.In Stock: 1230ECS-180-20-1X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-180-20-1 is determined by the following critical parameters:

Mandatory Match Requirements:

• Frequency: 18 MHz
• Frequency Tolerance: ±30ppm
• Load Capacitance: 20pF
• Operating Mode: Fundamental
• Operating Temperature Range: -10°C ~ 70°C
• Mounting Type: Through Hole

Allowable Variations:

• ESR: May vary (20 Ohms or 40 Ohms acceptable within circuit design margins)
• Package Configuration: HC-49/U or HC-49/US variants permitted
• Product Status: Active alternatives preferred over obsolete classifications
• RoHS Compliance: ROHS3 compliant alternatives available

The ECS-180-20-4 and ECS-180-20-1X meet all mandatory parameters while offering different ESR and package height characteristics. The ECS-180-20-1X provides an active product status alternative with identical electrical specifications to the main part.

Parameter Comparison

Engineering Selection Recommendations

For Active Product Status Requirement: The ECS-180-20-1X is the primary equivalent, offering identical electrical specifications (18 MHz, ±30ppm, 20pF, 20 Ohms ESR) with Active product status and ROHS3 compliance. This part is suitable for new production runs and long-term supply chain continuity.

For ESR Tolerance Applications: The ECS-180-20-4 provides an alternative with doubled ESR (40 Ohms) and Active product status. This substitution is valid only when circuit design permits the higher ESR specification. The reduced package height (0.138" vs. 0.530") may affect PCB layout compatibility.

For RoHS Compliance: Only the ECS-180-20-1X meets ROHS3 compliance requirements. Both ECS-180-20-1 and ECS-180-20-4 are RoHS non-compliant and should not be selected for applications requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can ECS-180-20-4 replace ECS-180-20-1 directly? A: Electrical substitution is possible if circuit design accommodates 40 Ohms ESR instead of 20 Ohms. Physical compatibility requires verification due to package height difference (0.138" vs. 0.530").

Q: What is the primary advantage of ECS-180-20-1X? A: The ECS-180-20-1X maintains identical electrical specifications to ECS-180-20-1 while offering Active product status and ROHS3 compliance, ensuring long-term availability and regulatory compliance.

Q: Are all three parts mechanically interchangeable? A: All three parts use through-hole mounting with identical frequency and load capacitance. However, package height variations (HC-49/U vs. HC-49/US) and physical dimensions may require PCB layout verification.

Q: Does ESR variation affect circuit performance? A: ESR affects oscillator startup characteristics and power consumption. The ECS-180-20-4 with 40 Ohms ESR may require circuit validation if the original design specified 20 Ohms ESR.

Q: Which substitute is recommended for new designs? A: The ECS-180-20-1X is recommended for new designs, providing Active product status, ROHS3 compliance, and identical electrical performance to the original part.