ECS-120-18-7S-TR Crystal Equivalent & Substitute Parts

Part Overview

The ECS-120-18-7S-TR is a 12 MHz fundamental mode crystal oscillator in a 4-SOJ surface mount package with 18pF load capacitance and 60 Ohms equivalent series resistance. This component is classified as Active product status and is currently in stock with 1048 units available. The part is RoHS non-compliant and operates across the -10°C to 70°C temperature range. Substitute parts may be required due to inventory constraints, design revisions, or compliance requirement changes.

Substiute Parts

ECS-120-18-7S-TR

ECS Inc.In Stock: 1153ECS-120-18-7S-TR Datasheet

Current PartRFQ

ECS-120-18-7SX-TR

ECS Inc.In Stock: 10188ECS-120-18-7SX-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-120-18-7S-TR is determined by the following critical parameters:

• Frequency: Must be 12 MHz
• Frequency Tolerance: Must be ±30ppm
• Load Capacitance: Must be 18pF
• Operating Mode: Must be Fundamental
• Package / Case: Must be 4-SOJ, 9.40mm pitch
• Operating Temperature Range: Must be -10°C ~ 70°C
• Mounting Type: Must be Surface Mount

The ESR parameter may vary within acceptable design margins. Variations in ESR affect circuit performance characteristics but do not prevent functional substitution when other parameters remain constant.

Parameter Comparison

Engineering Selection Recommendations

The ECS-120-18-7SX-TR is electrically and mechanically compatible with the ECS-120-18-7S-TR. Both parts share identical frequency, load capacitance, operating mode, package configuration, and temperature range specifications. The primary differences are ESR (60 Ohms versus 50 Ohms) and compliance status.

The ECS-120-18-7S-TR is recommended for new designs due to its Active product status. The ECS-120-18-7SX-TR carries a Not For New Designs designation and should be used only for legacy system support or when inventory of the primary part is unavailable. The ECS-120-18-7SX-TR offers ROHS3 compliance, whereas the ECS-120-18-7S-TR is RoHS non-compliant. Selection between these parts should account for regulatory requirements and product lifecycle stage.

Frequently Asked Questions (FAQ)

Q: Can the ECS-120-18-7SX-TR replace the ECS-120-18-7S-TR in existing designs?

A: Yes. Both parts meet identical electrical specifications for frequency, tolerance, load capacitance, and operating temperature. The 10 Ohm ESR difference (60 Ohms to 50 Ohms) is within acceptable substitution margins for most applications.

Q: What is the significance of the "Not For New Designs" status on the ECS-120-18-7SX-TR?

A: This designation indicates the part is in mature or declining production phase. It remains available for existing product support but should not be selected for new development projects. The ECS-120-18-7S-TR is the recommended choice for new designs.

Q: Are there package or footprint differences between these parts?

A: No. Both parts use the 4-SOJ package with 9.40mm pitch and identical physical dimensions (0.492" L x 0.181" W, 12.50mm x 4.60mm). PCB footprints are interchangeable.

Q: How does the ESR difference affect circuit performance?

A: ESR influences oscillator startup time and power consumption. The 50 Ohm ESR of the ECS-120-18-7SX-TR provides lower resistance compared to the 60 Ohm ESR of the ECS-120-18-7S-TR. Circuit design must account for this parameter during component selection.

Q: What compliance differences exist between these parts?

A: The ECS-120-18-7S-TR is RoHS non-compliant. The ECS-120-18-7SX-TR is ROHS3 compliant. Selection depends on regulatory requirements for the end application.