ECS-25-S-1 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-25-S-1 is a 2.5 MHz through-hole crystal oscillator in HC-49/U package designed for fundamental mode operation. This part carries a "Not For New Designs" status, indicating it is obsolete or superseded. Finding equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and meet current compliance requirements for new production runs.

Substiute Parts

ECS-25-S-1

ECS Inc.In Stock: 1048ECS-25-S-1 Datasheet

Current PartRFQ

ECS-25-S-1X

ECS Inc.In Stock: 1282ECS-25-S-1X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ECS-25-S-1 is determined by strict equivalence across the following critical parameters:

• Frequency: Must be exactly 2.5 MHz
• Frequency Tolerance: Must be ±30ppm or tighter
• Frequency Stability: Must be ±50ppm or better
• ESR: Must be 300 Ohms
• Operating Mode: Must be Fundamental
• Package / Case: Must be HC-49/U
• Mounting Type: Must be Through Hole
• Operating Temperature Range: Must cover -10°C ~ 70°C minimum
• Load Capacitance: Must be Series configuration

The ECS-25-S-1X meets all these criteria and qualifies as a parametric equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

The ECS-25-S-1X is the direct substitute for the ECS-25-S-1. Both parts are electrically and mechanically identical across all specified parameters. The primary distinction is product lifecycle status and compliance posture:

• The ECS-25-S-1 is marked "Not For New Designs," indicating end-of-life status
• The ECS-25-S-1X carries "Active" status, confirming ongoing availability and manufacturer support
• The ECS-25-S-1X is ROHS3 compliant, whereas the original part is RoHS non-compliant

For new designs or production transitions, the ECS-25-S-1X is the appropriate selection. Both parts maintain identical electrical performance, frequency characteristics, and physical form factor, ensuring direct drop-in compatibility in existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the ECS-25-S-1X be used as a direct replacement for the ECS-25-S-1 in existing designs?

A: Yes. The ECS-25-S-1X is electrically and mechanically equivalent. All critical parameters—frequency, tolerance, stability, ESR, operating mode, package, and temperature range—are identical. The parts are pin-compatible and functionally interchangeable.

Q: What is the difference between the ECS-25-S-1 and ECS-25-S-1X?

A: The primary differences are product status and compliance. The ECS-25-S-1 is obsolete ("Not For New Designs"), while the ECS-25-S-1X is active. The ECS-25-S-1X is ROHS3 compliant; the original is not. Electrically and mechanically, they are identical.

Q: Are there any package or mounting differences?

A: No. Both parts use the HC-49/U package with through-hole mounting. Physical dimensions and height specifications are identical.

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

A: Both the ECS-25-S-1 and ECS-25-S-1X operate across -10°C to 70°C.

Q: Is the ECS-25-S-1X suitable for new production designs?

A: Yes. The ECS-25-S-1X carries "Active" product status and is ROHS3 compliant, making it the appropriate choice for new designs requiring a 2.5 MHz fundamental mode crystal in HC-49/U package.