ECS-122.8-20-1 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-122.8-20-1 is a 12.288 MHz through-hole crystal oscillator in HC-49/U package with 20pF load capacitance and 30 Ohms equivalent series resistance. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. For new applications or when the original part becomes unavailable, identifying compatible substitute parts with matching electrical and mechanical specifications is essential for design continuity and procurement flexibility.

Substiute Parts

ECS-122.8-20-1

ECS Inc.In Stock: 865ECS-122.8-20-1 Datasheet

Current PartRFQ

ECS-122.8-20-1X

ECS Inc.In Stock: 1509ECS-122.8-20-1X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ECS-122.8-20-1 is determined by strict equivalence across the following critical parameters:

• Frequency: Must be exactly 12.288 MHz
• Frequency Tolerance: Must be ±30ppm or tighter
• Load Capacitance: Must be 20pF
• ESR: Must be 30 Ohms
• Operating Mode: Must be Fundamental
• Package / Case: Must be HC-49/U
• Mounting Type: Must be Through Hole
• Operating Temperature Range: Must support -10°C ~ 70°C minimum

The substitute part ECS-122.8-20-1X meets all these criteria and is therefore a direct parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

The ECS-122.8-20-1X is the direct parametric equivalent to the ECS-122.8-20-1. All electrical and mechanical specifications are identical. The primary differences are product lifecycle status and regulatory compliance:

• ECS-122.8-20-1X carries Active product status, making it the recommended choice for new designs and ongoing production.
• ECS-122.8-20-1X is ROHS3 compliant, whereas the original part is RoHS non-compliant. This distinction is significant for applications subject to RoHS regulations.

For applications currently using ECS-122.8-20-1, transition to ECS-122.8-20-1X provides equivalent electrical performance with improved regulatory compliance and continued manufacturer support.

Frequently Asked Questions (FAQ)

Q: Can ECS-122.8-20-1X be used as a direct replacement for ECS-122.8-20-1?

A: Yes. All electrical parameters (frequency, tolerance, load capacitance, ESR, operating mode) and mechanical specifications (package, mounting type, dimensions, temperature range) are identical. The parts are functionally interchangeable.

Q: What is the significance of the product status difference?

A: ECS-122.8-20-1 is marked "Not For New Designs," indicating the manufacturer no longer recommends it for new applications. ECS-122.8-20-1X is Active status, meaning it is currently supported and recommended for new designs.

Q: Does the RoHS compliance difference affect compatibility?

A: RoHS compliance affects regulatory and supply chain requirements, not electrical or mechanical compatibility. If your application or market requires RoHS compliance, ECS-122.8-20-1X is the appropriate choice.

Q: Are the physical dimensions identical?

A: Yes. 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 mechanically interchangeable on PCBs designed for HC-49/U crystals.

Q: What parameters must match for substitution?

A: Frequency (12.288 MHz), frequency tolerance (±30ppm), load capacitance (20pF), ESR (30 Ohms), operating mode (Fundamental), package (HC-49/U), mounting type (Through Hole), and operating temperature range (-10°C ~ 70°C) must all match exactly.