ECS-40-S-4 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-40-S-4 is a 4 MHz through-hole crystal oscillator in HC-49/US package with ±30ppm frequency tolerance 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 This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. For new applications or production continuity, equivalent substitute parts with active product status are available that maintain identical electrical and mechanical specifications.

Substiute Parts

ECS-40-S-4

ECS Inc.In Stock: 1455ECS-40-S-4 Datasheet

Current PartRFQ

ECS-40-S-4X

ECS Inc.In Stock: 1972ECS-40-S-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ECS-40-S-4 is determined by the following critical parameters that must remain constant:

• Frequency: 4 MHz (exact match required)
• Frequency Tolerance: ±30ppm (defines frequency accuracy class)
• ESR: 150 Ohms (determines circuit loading and performance)
• Package / Case: HC-49/US (ensures mechanical and electrical compatibility)
• Mounting Type: Through Hole (PCB assembly compatibility)
• Operating Temperature Range: -10°C ~ 70°C (thermal envelope)
• Load Capacitance Type: Series (circuit interface requirement)

The ECS-40-S-4X meets all these criteria and qualifies as a parametric equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

The ECS-40-S-4X is the direct substitute for the ECS-40-S-4. Selection between these parts is determined by product lifecycle and compliance requirements:

Use ECS-40-S-4X for new designs and production continuity. This part carries Active product status, ensuring long-term availability and supply chain stability. The ECS-40-S-4X is ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components in most jurisdictions.

The ECS-40-S-4 remains available for legacy system support and repair applications where existing inventory or design lock-in requires the original part number. However, the ECS-40-S-4 is designated Not For New Designs and is RoHS non-compliant, making it unsuitable for new product development.

Both parts are electrically and mechanically identical across all critical parameters: frequency, tolerance, ESR, package, and thermal range. Direct substitution is possible without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can ECS-40-S-4X be used as a direct replacement for ECS-40-S-4 in existing designs?

A: Yes. The ECS-40-S-4X is a parametric equivalent with identical electrical specifications (4 MHz, ±30ppm tolerance, 150 Ohms ESR) and mechanical package (HC-49/US through-hole). No circuit changes are required.

Q: What is the difference between ECS-40-S-4 and ECS-40-S-4X?

A: The primary differences are product status and compliance. ECS-40-S-4X is Active and ROHS3 compliant, while ECS-40-S-4 is Not For New Designs and RoHS non-compliant. All electrical and mechanical parameters are identical.

Q: Why should I use ECS-40-S-4X instead of ECS-40-S-4?

A: ECS-40-S-4X offers better supply chain continuity due to Active product status and meets current RoHS3 environmental compliance standards. For new designs and production, ECS-40-S-4X is the recommended choice.

Q: Are there any package or pinout differences between these parts?

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

Q: Can these crystals be used interchangeably in PCB assembly?

A: Yes. Both parts are through-hole mounted in the same HC-49/US package footprint. PCB layout and assembly procedures remain unchanged.

Q: What is the operating temperature range for these crystals?

A: Both ECS-40-S-4 and ECS-40-S-4X operate across -10°C to 70°C. This range applies to both frequency stability and mechanical performance.