ECS-51-20-1 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-51-20-1 is a 5.068 MHz through-hole crystal oscillator in HC-49/U package with 20pF load capacitance and 50 Ohms equivalent series resistance. This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Finding equivalent substitute parts is necessary for maintenance, repair, and legacy system support where this specific frequency and package configuration is required.

Substiute Parts

ECS-51-20-1

ECS Inc.In Stock: 1322ECS-51-20-1 Datasheet

Current PartRFQ

ECS-51-20-1X

ECS Inc.In Stock: 972ECS-51-20-1X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ECS-51-20-1 is determined by strict equivalence across the following critical parameters:

• Frequency: 5.068 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Load Capacitance: 20pF (exact match required)
• ESR: 50 Ohms (exact match required)
• Package / Case: HC-49/U (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -10°C ~ 70°C (exact match required)
• Operating Mode: Fundamental (exact match required)

The ECS-51-20-1X meets all these criteria and is therefore a direct parametric equivalent. The primary distinction between the main part and its substitute is product status and compliance certification.

Parameter Comparison

Engineering Selection Recommendations

The ECS-51-20-1X is the direct substitute for the ECS-51-20-1. All electrical and mechanical parameters are identical. The ECS-51-20-1X is the preferred selection because it carries Active product status, indicating ongoing manufacturer support and availability. Additionally, the ECS-51-20-1X is ROHS3 compliant, whereas the original ECS-51-20-1 is RoHS non-compliant. For applications where RoHS compliance is a requirement, the ECS-51-20-1X is the appropriate choice. Both parts share identical REACH and ECCN classifications.

Frequently Asked Questions (FAQ)

Q: Can the ECS-51-20-1X be used as a direct replacement for the ECS-51-20-1?

A: Yes. The ECS-51-20-1X is a parametric equivalent with identical electrical specifications (5.068 MHz, ±30ppm tolerance, 20pF load capacitance, 50 Ohms ESR) and mechanical dimensions (HC-49/U package, through-hole mounting). Both parts operate over the same temperature range (-10°C ~ 70°C) and use the same fundamental operating mode.

Q: What is the difference between these two parts?

A: The primary differences are product status and compliance certification. The ECS-51-20-1 is classified as Not For New Designs and is RoHS non-compliant. The ECS-51-20-1X is Active and ROHS3 compliant. All functional and dimensional specifications are identical.

Q: Are there any compatibility concerns when substituting the ECS-51-20-1X for the ECS-51-20-1?

A: No compatibility concerns exist. The parts are mechanically and electrically interchangeable. The HC-49/U package, pin configuration, frequency, load capacitance, and ESR are identical. PCB layout and circuit design require no modification.

Q: Does the RoHS compliance difference affect circuit performance?

A: No. RoHS compliance relates to material composition and environmental regulations, not electrical performance. Both parts deliver identical frequency stability, tolerance, and operating characteristics.

Q: What is the inventory status for these parts?

A: The ECS-51-20-1 has 1221 pieces in stock. The ECS-51-20-1X has 909 pieces in stock. Both are available as new original components.