ECS-35-17-1 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-35-17-1 is a 4.679545 MHz through-hole crystal oscillator in HC-49/U package with 17pF load capacitance and 120 Ohms equivalent series resistance. This component is classified as Not For New Designs, indicating it is a legacy part. Finding equivalent or substitute parts is necessary for applications requiring active production support, improved compliance status, or enhanced environmental specifications.

Substiute Parts

ECS-35-17-1

ECS Inc.In Stock: 2040ECS-35-17-1 Datasheet

Current PartRFQ

ECS-35-17-1X

ECS Inc.In Stock: 1831ECS-35-17-1X Datasheet

Parametric EquivalentRFQ

MP036S

CTS-Frequency ControlsIn Stock: 1694MP036S Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-35-17-1 is determined by the following critical parameters:

• Frequency: 4.679545 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Package / Case: HC-49/U (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Mode: Fundamental (exact match required)

Two substitute parts meet these core criteria with allowable variations in load capacitance and ESR within acceptable engineering tolerances for crystal oscillator applications.

Parameter Comparison

Engineering Selection Recommendations

ECS-35-17-1X is the primary parametric equivalent. It maintains identical electrical specifications (frequency, tolerance, load capacitance, and ESR) while offering Active product status and ROHS3 compliance. This part is recommended for new production runs and applications requiring regulatory compliance.

MP036S is a direct manufacturer alternative from CTS-Frequency Controls. It matches the core frequency and tolerance specifications but introduces variations in load capacitance (18pF vs. 17pF) and ESR (200 Ohms vs. 120 Ohms). The extended operating temperature range (-20°C ~ 70°C) provides additional environmental margin. This part is suitable for applications where minor load capacitance and ESR variations are acceptable within circuit design tolerances. ROHS3 compliance is confirmed.

Both substitute parts are Active products with current manufacturing support and improved compliance status compared to the legacy ECS-35-17-1.

Frequently Asked Questions (FAQ)

Q: Can ECS-35-17-1X be used as a direct drop-in replacement for ECS-35-17-1?

A: Yes. ECS-35-17-1X maintains identical electrical parameters (frequency, tolerance, load capacitance, ESR) and package specifications (HC-49/U, through-hole mounting). The primary difference is product status (Active vs. Not For New Designs) and improved RoHS compliance.

Q: What are the implications of the load capacitance difference between ECS-35-17-1 and MP036S?

A: MP036S specifies 18pF load capacitance versus 17pF for ECS-35-17-1. This 1pF difference is within typical circuit design tolerances for crystal oscillator applications. Circuit designers must verify that the oscillator circuit can accommodate this variation without exceeding frequency stability requirements.

Q: Does the higher ESR of MP036S (200 Ohms vs. 120 Ohms) affect compatibility?

A: ESR affects oscillator startup characteristics and power consumption. The 80 Ohm increase in MP036S requires verification that the oscillator circuit design can support this higher resistance value. Circuit simulation or prototype testing is appropriate for critical applications.

Q: Why does MP036S have a wider operating temperature range?

A: MP036S specifies -20°C ~ 70°C versus -10°C ~ 70°C for ECS-35-17-1. This extended lower temperature limit provides additional environmental margin for applications requiring operation below -10°C.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both ECS-35-17-1X and MP036S are ROHS3 compliant, whereas the original ECS-35-17-1 is RoHS non-compliant. This is relevant for applications subject to RoHS regulations.