ECS-36-20-7S-TR Equivalent & Substitute Parts

Part Overview

The ECS-36-20-7S-TR is a 3.6864 MHz crystal oscillator in 4-SOJ surface mount package with 20pF load capacitance and 250 Ohms ESR. This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Finding equivalent substitute parts is necessary for ongoing production support, maintenance applications, and legacy system repairs where this frequency and load capacitance specification remain required.

Substiute Parts

ECS-36-20-7S-TR

ECS Inc.In Stock: 4564ECS-36-20-7S-TR Datasheet

Current PartRFQ

ECS-36-18-7SX-TR

ECS Inc.In Stock: 3747ECS-36-18-7SX-TR Datasheet

SimilarRFQ

ECS-36-20-7SX-TR

ECS Inc.In Stock: 12090ECS-36-20-7SX-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-36-20-7S-TR is determined by the following critical parameters:

Mandatory Match Parameters:

• Frequency: 3.6864 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Load Capacitance: 20pF (exact match required)
• Package / Case: 4-SOJ, 9.40mm pitch (exact match required)
• Operating Temperature Range: -10°C ~ 70°C (exact match required)

Allowable Variation Parameters:

• ESR (Equivalent Series Resistance): 250 Ohms (main part) to 200 Ohms (substitute) — lower ESR is acceptable and represents improved performance
• RoHS Status: Non-compliant (main part) to ROHS3 Compliant (substitute) — compliance upgrade is acceptable
• Series designation: ECX-3S (main part) to ECX-3SX (substitute) — represents product line evolution

The ECS-36-20-7SX-TR qualifies as a direct substitute because it maintains all mandatory parameters while offering improved ESR characteristics and enhanced RoHS compliance. The ECS-36-18-7SX-TR does not qualify as a substitute for the ECS-36-20-7S-TR due to differing load capacitance (18pF vs. 20pF).

Parameter Comparison

Engineering Selection Recommendations

ECS-36-20-7SX-TR is the qualified substitute for ECS-36-20-7S-TR. This part maintains identical electrical specifications for frequency, tolerance, and load capacitance while providing:

• Improved ESR performance (200 Ohms vs. 250 Ohms)
• ROHS3 compliance status, meeting current environmental regulations
• Equivalent mechanical and thermal characteristics
• Higher current inventory availability (12,068 pcs vs. 4,542 pcs)

Both parts carry Not For New Designs status, indicating neither is recommended for new product development. For legacy system support and replacement applications where the 20pF load capacitance is specified, ECS-36-20-7SX-TR provides the most current equivalent.

ECS-36-18-7SX-TR is not suitable as a substitute due to its 18pF load capacitance specification, which differs from the required 20pF. Substituting this part would alter circuit timing characteristics and is not electrically equivalent.

Frequently Asked Questions (FAQ)

Q: Can ECS-36-20-7SX-TR be used as a direct replacement for ECS-36-20-7S-TR?

A: Yes. The ECS-36-20-7SX-TR is a direct substitute. It maintains identical frequency (3.6864 MHz), frequency tolerance (±30ppm), load capacitance (20pF), and package specifications (4-SOJ, 9.40mm pitch). The lower ESR (200 Ohms vs. 250 Ohms) represents improved performance characteristics.

Q: Why is ECS-36-18-7SX-TR not a substitute?

A: The ECS-36-18-7SX-TR has a load capacitance of 18pF, while the ECS-36-20-7S-TR requires 20pF. This 2pF difference affects circuit resonance and timing accuracy. These parts are not electrically interchangeable.

Q: What is the difference between ECX-3S and ECX-3SX series designations?

A: The ECX-3SX represents the current product line evolution of the ECX-3S series. Both series maintain the same electrical and mechanical specifications for equivalent part numbers. The ECX-3SX series includes ROHS3 compliance.

Q: Are the physical dimensions identical between substitute parts?

A: Yes. Both ECS-36-20-7S-TR and ECS-36-20-7SX-TR share identical dimensions (12.50mm L x 4.60mm W, 3.70mm max height) and 4-SOJ package configuration with 9.40mm pitch, ensuring PCB layout compatibility.

Q: Does the improved ESR of ECS-36-20-7SX-TR affect circuit design?

A: Lower ESR (200 Ohms vs. 250 Ohms) is a performance improvement that does not require circuit redesign. Circuits designed for 250 Ohms ESR will operate within specification with the lower ESR substitute.