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

Part Overview

The ECS-36-S-7S-TR is a 3.6864 MHz surface mount crystal oscillator in a 4-SOJ package with 9.40mm pitch. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for legacy system maintenance, repair operations, and continued production support where design migration is not feasible.

Substiute Parts

ECS-36-S-7S-TR

ECS Inc.In Stock: 1816ECS-36-S-7S-TR Datasheet

Current PartRFQ

ECS-36-S-7SX-TR

ECS Inc.In Stock: 2758ECS-36-S-7SX-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Mandatory Matching Parameters:

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

Allowable Variation Parameters:

• ESR (Equivalent Series Resistance): 250 Ohms (main part) to 200 Ohms (substitute) — lower ESR values are acceptable as they represent improved electrical performance
• RoHS Status: May differ between main part and substitute
• Frequency Stability: ±50ppm (consistent across all parts in this group)

The ECS-36-S-7SX-TR qualifies as a direct substitute because it maintains all mandatory parameters while offering improved ESR performance and enhanced RoHS compliance.

Parameter Comparison

Engineering Selection Recommendations

The ECS-36-S-7SX-TR is a qualified substitute for the ECS-36-S-7S-TR based on electrical and mechanical parameter equivalence. The substitute part offers the following advantages:

Electrical Performance: The ECS-36-S-7SX-TR features a lower ESR of 200 Ohms compared to the main part's 250 Ohms, resulting in reduced power dissipation and improved circuit efficiency.

Regulatory Compliance: The substitute part is ROHS3 compliant, whereas the main part is RoHS non-compliant. This distinction is relevant for applications subject to RoHS regulations.

Availability: The substitute part has higher inventory availability (2691 Pcs) compared to the main part (1800 Pcs).

Both parts share identical frequency specifications, package dimensions, and operating temperature ranges, ensuring direct mechanical and electrical compatibility in existing circuit designs.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts maintain identical frequency (3.6864 MHz), frequency tolerance (±30ppm), package type (4-SOJ, 9.40mm pitch), and operating temperature range (-10°C ~ 70°C). The substitute part's lower ESR (200 Ohms vs. 250 Ohms) represents improved performance and does not compromise compatibility.

Q: What is the significance of the ESR difference between these parts?

A: ESR (Equivalent Series Resistance) affects power dissipation and circuit Q-factor. The substitute part's 200 Ohms ESR is lower than the main part's 250 Ohms, resulting in reduced energy loss and improved oscillator stability. This is a beneficial change for circuit performance.

Q: Are there any package or mounting differences?

A: No. Both parts use identical 4-SOJ packaging with 9.40mm pitch, identical dimensions (0.492" L x 0.181" W / 12.50mm x 4.60mm), and identical maximum seated height (0.146" / 3.70mm). PCB layout and assembly processes require no modification.

Q: What is the difference in RoHS compliance?

A: The main part (ECS-36-S-7S-TR) is RoHS non-compliant, while the substitute (ECS-36-S-7SX-TR) is ROHS3 compliant. For applications requiring RoHS compliance, the substitute part is the appropriate selection.

Q: Are both parts classified as "Not For New Designs"?

A: Yes. Both the main part and substitute are classified as "Not For New Designs," indicating end-of-life status. Both are suitable for legacy system support and repair operations only.