ECS-40.3-20-4 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-40.3-20-4 is a 4.032 MHz through-hole crystal oscillator in HC-49/US package with 20pF load capacitance and 150 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 This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line.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 original components are unavailable or inventory is depleted.

Substiute Parts

ECS-40.3-20-4

ECS Inc.In Stock: 995ECS-40.3-20-4 Datasheet

Current PartRFQ

ECS-40.3-20-4X

ECS Inc.In Stock: 1768ECS-40.3-20-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ECS-40.3-20-4 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: 150 Ohms (exact match required)
• Operating Mode: Fundamental (exact match required)
• Package / Case: HC-49/US (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -10°C ~ 70°C (exact match required)

The ECS-40.3-20-4X meets all these criteria and qualifies as a parametric equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

The ECS-40.3-20-4X is the direct substitute for the ECS-40.3-20-4. Both parts are manufactured by ECS Inc. and share identical electrical and mechanical specifications across all critical parameters. The primary distinction is product status and regulatory compliance: the ECS-40.3-20-4X is Active and ROHS3 Compliant, whereas the original part is Not For New Designs and RoHS non-compliant. For applications requiring RoHS3 compliance or where long-term availability is a concern, the ECS-40.3-20-4X is the appropriate selection. Both parts are functionally interchangeable in through-hole circuit board applications requiring a 4.032 MHz fundamental mode crystal with 20pF load capacitance.

Frequently Asked Questions (FAQ)

Q: Can the ECS-40.3-20-4X be used as a direct replacement for the ECS-40.3-20-4?

A: Yes. The ECS-40.3-20-4X is a parametric equivalent with identical frequency, load capacitance, ESR, package, and operating temperature specifications. Both parts are pin-compatible and functionally interchangeable in through-hole applications.

Q: What is the difference between these two parts?

A: The ECS-40.3-20-4X is the current production version (Active status) with ROHS3 compliance. The ECS-40.3-20-4 is marked Not For New Designs and is RoHS non-compliant. Electrical performance is identical.

Q: Are there any package or mounting differences?

A: No. Both parts use the HC-49/US package with identical dimensions (0.447" L x 0.183" W, 11.35mm x 4.65mm) and maximum seated height (0.138" / 4.60mm). Both are through-hole mounted components.

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 meet the same frequency tolerance (±30ppm) and ESR (150 Ohms) specifications.

Q: What is the operating temperature range for both parts?

A: Both the ECS-40.3-20-4 and ECS-40.3-20-4X operate across -10°C to 70°C.