ECS-73-20-18 Crystal Equivalent & Substitute Parts

Part Overview

The ECS-73-20-18 is a 7.3728 MHz surface mount crystal oscillator designed for precision timing applications requiring fundamental mode operation. This Active product is manufactured by ECS Inc. in the CSM-12 series and is ROHS3 compliant with unlimited moisture sensitivity rating. Substitute parts are identified when inventory constraints, lead time requirements, or application-specific load capacitance adjustments necessitate alternative component selection while maintaining core frequency and electrical performance specifications.

Substiute Parts

ECS-73-20-18

ECS Inc.In Stock: 947ECS-73-20-18 Datasheet

Current PartRFQ

ECS-73-18-18-TR

ECS Inc.In Stock: 15444ECS-73-18-18-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-73-20-18 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 7.3728 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• ESR: 100 Ohms (exact match required)
• Operating Mode: Fundamental (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• Package / Case: 4-SMD, No Lead (exact match required)
• Mounting Type: Surface Mount (exact match required)

Allowable Variation Parameters:

• Load Capacitance: 18pF to 20pF (within application tolerance)

The ECS-73-18-18-TR qualifies as a substitute based on matching all mandatory parameters. The load capacitance difference (18pF versus 20pF) represents an allowable variation when the application circuit design accommodates this specification.

Parameter Comparison

Engineering Selection Recommendations

Both the ECS-73-20-18 and ECS-73-18-18-TR are Active products from ECS Inc. with identical ROHS3 compliance and unlimited moisture sensitivity ratings. Selection between these parts is determined by application load capacitance requirements and circuit design specifications. The ECS-73-18-18-TR offers significantly higher inventory availability (15,389 pcs versus 904 pcs), making it suitable for high-volume production when load capacitance tolerance permits 18pF operation. Both parts maintain identical frequency accuracy, temperature stability, and physical form factor for direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can the ECS-73-18-18-TR replace the ECS-73-20-18 in all applications?

A: Substitution is valid only when the application circuit design accommodates 18pF load capacitance. The 2pF difference may affect oscillation frequency trim characteristics. Circuit validation is required before production implementation.

Q: Are there physical compatibility concerns between these parts?

A: No. Both parts share identical package dimensions (11.80mm x 5.50mm), height (2.50mm maximum), and 4-SMD No Lead configuration. PCB footprints and assembly processes are interchangeable.

Q: What compliance certifications apply to both parts?

A: Both the ECS-73-20-18 and ECS-73-18-18-TR are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.60.0050.

Q: How does load capacitance affect crystal selection?

A: Load capacitance is a critical parameter that determines the oscillation frequency trim point in the application circuit. The ECS-73-20-18 is specified for 20pF load capacitance, while the ECS-73-18-18-TR operates at 18pF. Selection must align with the circuit design load capacitance value.

Q: Are both parts available in the same packaging format?

A: Both parts are supplied in Tape & Reel (TR) packaging for automated assembly. The ECS-73-18-18-TR explicitly includes TR designation in the part number.