ECS-40.3-20-1 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-40.3-20-1 is a 4.032 MHz through-hole crystal oscillator in HC-49/U package with 20pF load capacitance and 100 Ohms equivalent series resistance. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent substitute parts is necessary for maintenance, repair, and legacy system support where original inventory is depleted or unavailable.

Substiute Parts

ECS-40.3-20-1

ECS Inc.In Stock: 851ECS-40.3-20-1 Datasheet

Current PartRFQ

ECS-40.3-20-1X

ECS Inc.In Stock: 794ECS-40.3-20-1X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ECS-40.3-20-1 is determined by strict equivalence across the following critical parameters:

• Frequency: 4.032 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Load Capacitance: 20pF (exact match required)
• ESR: 100 Ohms (exact match required)
• Operating Mode: Fundamental (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)

The ECS-40.3-20-1X meets all these criteria and qualifies as a parametric equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

The ECS-40.3-20-1X is the direct parametric equivalent for the ECS-40.3-20-1. Both parts are electrically and mechanically identical across all functional parameters. The primary distinction is product lifecycle status: the original part is classified as "Not For New Designs," while the substitute is Active.

The ECS-40.3-20-1X offers an additional compliance advantage: it is ROHS3 Compliant, whereas the original part is RoHS non-compliant. This makes the substitute suitable for applications requiring RoHS compliance.

Both parts share identical MSL, REACH, ECCN, and HTSUS classifications, ensuring regulatory consistency in component selection.

Frequently Asked Questions (FAQ)

Q: Can the ECS-40.3-20-1X be used as a direct replacement for the ECS-40.3-20-1?

A: Yes. The ECS-40.3-20-1X is a parametric equivalent with identical electrical and mechanical specifications across all critical parameters: frequency, tolerance, load capacitance, ESR, operating mode, package, mounting type, and temperature range.

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

A: The series designation reflects internal product line differentiation within ECS Inc. Both parts use the HC-49/U package standard and are mechanically and electrically equivalent for this application.

Q: Why is the original part marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status. The ECS-40.3-20-1X, marked as Active, is the current production equivalent and should be used for new designs and ongoing production.

Q: Does the RoHS compliance difference affect substitution?

A: The ECS-40.3-20-1X is ROHS3 Compliant while the original is RoHS non-compliant. For applications requiring RoHS compliance, the substitute is the appropriate choice. For legacy systems without RoHS requirements, both parts are functionally equivalent.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical dimensions: 0.447" L x 0.183" W (11.35mm x 4.65mm) with a maximum seated height of 0.530" (13.46mm). They are mechanically interchangeable in through-hole PCB applications.

Q: What is the moisture sensitivity level for both parts?

A: Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.