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

Part Overview

The ECS-40.3-20-1X is a 4.032 MHz through-hole crystal oscillator in HC-49/U package, designed for fundamental mode operation with 20pF load capacitance and 100 Ohms equivalent series resistance. This part is currently Active and ROHS3 compliant. Substitute parts may be required due to inventory constraints, design phase transitions, or compliance requirements in specific applications.

Substiute Parts

ECS-40.3-20-1X

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

Current PartRFQ

ECS-40.3-20-1

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The ECS-40.3-20-1X has one parametric equivalent substitute: ECS-40.3-20-1. Substitution eligibility is determined by 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)

Both parts meet these criteria and are therefore electrically and mechanically interchangeable within the specified operating conditions.

Parameter Comparison

Engineering Selection Recommendations

The ECS-40.3-20-1X is the preferred selection for new designs due to its Active product status and ROHS3 compliance. The ECS-40.3-20-1 is electrically and mechanically equivalent but carries a "Not For New Designs" designation and is RoHS non-compliant. Selection between these parts should be based on:

• Compliance Requirements: Applications requiring ROHS3 compliance must use ECS-40.3-20-1X
• Design Phase: New designs should specify ECS-40.3-20-1X; legacy designs may continue with ECS-40.3-20-1
• Inventory Availability: Both parts are available in stock (747 Pcs for ECS-40.3-20-1X; 815 Pcs for ECS-40.3-20-1)

Frequently Asked Questions (FAQ)

Q: Are ECS-40.3-20-1X and ECS-40.3-20-1 electrically interchangeable?

A: Yes. Both parts have identical electrical specifications: 4.032 MHz frequency, ±30ppm tolerance, 20pF load capacitance, 100 Ohms ESR, and fundamental mode operation.

Q: Are these parts mechanically interchangeable?

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 (0.530", 13.46mm). Through-hole mounting is identical.

Q: What is the difference between ECS-40.3-20-1X and ECS-40.3-20-1?

A: The primary differences are product status and compliance. ECS-40.3-20-1X is Active and ROHS3 compliant, while ECS-40.3-20-1 is marked "Not For New Designs" and is RoHS non-compliant. Series designation differs (HC-49UX vs. HC-49U).

Q: Can I use ECS-40.3-20-1 in a new design?

A: ECS-40.3-20-1 is marked "Not For New Designs." New designs should specify ECS-40.3-20-1X to ensure long-term availability and compliance support.

Q: Are there RoHS compliance implications?

A: Yes. ECS-40.3-20-1X is ROHS3 compliant; ECS-40.3-20-1 is not. Applications subject to RoHS regulations must use ECS-40.3-20-1X.

Q: Do both parts have the same moisture sensitivity?

A: Yes. Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions.

Q: Are both parts subject to export control?

A: Both parts are classified as EAR99, indicating they are not subject to specific export licensing requirements.