ECS-35-18-18-TR Equivalent & Substitute Parts

Part Overview

The ECS-35-18-18-TR is a 4.679545 MHz crystal oscillator in 4-SMD, No Lead surface mount package with 18pF load capacitance. This component is classified as Active product status and is designed for applications requiring precise frequency generation in consumer electronics, timing circuits, and digital systems. Substitute parts are identified when equivalent electrical and mechanical specifications allow direct replacement while maintaining circuit performance and compliance requirements.

Substiute Parts

ECS-35-18-18-TR

ECS Inc.In Stock: 1746ECS-35-18-18-TR Datasheet

Current PartRFQ

ECS-35-17-18-TR

ECS Inc.In Stock: 1276ECS-35-17-18-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-35-18-18-TR is determined by the following critical parameters:

• Frequency Match: 4.679545 MHz (exact match required)
• Frequency Tolerance: ±30ppm (must be equal or tighter)
• ESR: 200 Ohms (must be equal)
• Operating Temperature Range: -40°C ~ 85°C (must cover or exceed)
• Package / Case: 4-SMD, No Lead (physical and electrical compatibility)
• Compliance: ROHS3 Compliant, MSL 1

The ECS-35-17-18-TR qualifies as a substitute based on matching frequency, frequency tolerance, ESR, operating temperature, package type, and compliance certifications. The load capacitance difference (17pF vs 18pF) represents a 1pF variance within acceptable substitution parameters for this crystal category, as both values fall within the standard load capacitance range for equivalent 4.679545 MHz crystals.

Parameter Comparison

Engineering Selection Recommendations

Both ECS-35-18-18-TR and ECS-35-17-18-TR are Active status products manufactured by ECS Inc. and maintain identical ROHS3 compliance and MSL 1 ratings. Selection between these parts is based on circuit load capacitance requirements. The ECS-35-18-18-TR is specified for 18pF load capacitance applications, while the ECS-35-17-18-TR is specified for 17pF load capacitance applications. Substitution is valid when the receiving circuit design accommodates the 1pF load capacitance variance. Both parts share identical frequency, frequency tolerance, ESR, operating temperature range, and physical package specifications, ensuring mechanical and electrical compatibility in surface mount applications.

Frequently Asked Questions (FAQ)

Q: Can ECS-35-17-18-TR replace ECS-35-18-18-TR in any application?

A: Substitution is valid when the circuit design load capacitance specification allows for 17pF operation. The 1pF difference in load capacitance may affect oscillation frequency stability in circuits with tight load capacitance tolerances. Verify circuit design specifications before substitution.

Q: Are the physical packages identical?

A: Yes. Both parts use 4-SMD, No Lead package with identical dimensions of 11.80mm x 5.50mm and maximum seated height of 2.50mm, ensuring identical PCB footprint and assembly compatibility.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both ECS-35-18-18-TR and ECS-35-17-18-TR are ROHS3 Compliant with MSL 1 (Unlimited) moisture sensitivity rating and REACH Unaffected status.

Q: What is the significance of the load capacitance difference?

A: Load capacitance affects the crystal's operating frequency in the circuit. The 18pF specification of the main part versus 17pF of the substitute represents a 1pF variance. Substitution requires confirmation that the circuit design can operate within this load capacitance tolerance without exceeding frequency stability limits.

Q: Are both parts from the same manufacturer series?

A: Yes. Both parts belong to the ECS Inc. CSM-12 series, confirming design family consistency and manufacturing standards alignment.