ECS-36-18-1 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-36-18-1 is a 3.6864 MHz through-hole crystal oscillator in HC-49/U package, designed for fundamental mode operation with 18pF load capacitance and 120 Ohms equivalent series resistance. This part carries a "Not For New Designs" status, making identification of active equivalent and substitute parts essential for ongoing production and maintenance applications. The part is RoHS non-compliant, which may restrict use in certain regulated markets.

Substiute Parts

ECS-36-18-1

ECS Inc.In Stock: 1255ECS-36-18-1 Datasheet

Current PartRFQ

ECS-36-18-1X

ECS Inc.In Stock: 2869ECS-36-18-1X Datasheet

Parametric EquivalentRFQ

MP037

CTS-Frequency ControlsIn Stock: 1587MP037 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-36-18-1 is determined by the following critical parameters:

• Frequency: Must be 3.6864 MHz (exact match required)
• Frequency Tolerance: Must be ±30ppm or tighter
• Package / Case: Must be HC-49/U (mechanical and electrical compatibility)
• Mounting Type: Must be Through Hole
• Operating Mode: Must be Fundamental

Load capacitance and ESR are secondary parameters that may vary within acceptable ranges for circuit operation, provided the primary frequency and tolerance specifications are met. Operating temperature range may extend beyond the original specification without affecting substitution validity.

Parameter Comparison

Engineering Selection Recommendations

ECS-36-18-1X is the primary parametric equivalent. It matches all critical specifications (frequency, tolerance, load capacitance, ESR, package, and mounting type) with identical electrical characteristics. The ECS-36-18-1X carries Active product status and ROHS3 compliance, making it suitable for new production and regulated applications where RoHS compliance is required.

MP037 is a direct manufacturer alternative from CTS-Frequency Controls. While it maintains the required 3.6864 MHz frequency and ±30ppm tolerance in HC-49/U package, it differs in load capacitance (20pF vs. 18pF) and ESR (200 Ohms vs. 120 Ohms). The MP037 also provides extended operating temperature range (-20°C ~ 70°C) and ROHS3 compliance. Selection of MP037 requires circuit-level verification that the 20pF load capacitance and 200 Ohm ESR are compatible with the application's oscillator circuit design.

Frequently Asked Questions (FAQ)

Q: Can ECS-36-18-1X be used as a direct drop-in replacement for ECS-36-18-1?

A: Yes. The ECS-36-18-1X is a parametric equivalent with identical electrical specifications and HC-49/U package. No circuit modifications are required.

Q: What are the differences between ECS-36-18-1X and MP037?

A: Both parts share the same frequency (3.6864 MHz), tolerance (±30ppm), and package (HC-49/U). The MP037 differs in load capacitance (20pF vs. 18pF) and ESR (200 Ohms vs. 120 Ohms). The MP037 also provides a wider operating temperature range (-20°C to 70°C vs. -10°C to 70°C).

Q: Is MP037 compatible with circuits designed for ECS-36-18-1?

A: MP037 compatibility depends on the oscillator circuit design. The 20pF load capacitance and 200 Ohm ESR differ from the original specification. Circuit verification is required to confirm that these parameter variations do not affect frequency stability or circuit performance.

Q: Why is ECS-36-18-1 marked "Not For New Designs"?

A: This designation indicates the part is obsolete or being phased out by the manufacturer. ECS-36-18-1X is the recommended active alternative for new production.

Q: Are all substitute parts RoHS compliant?

A: ECS-36-18-1 is RoHS non-compliant. Both ECS-36-18-1X and MP037 are ROHS3 compliant, making them suitable for applications requiring RoHS certification.

Q: Can these parts be used interchangeably in existing designs?

A: ECS-36-18-1X is a direct equivalent and can be used interchangeably. MP037 requires circuit-level evaluation due to differences in load capacitance and ESR before implementation.