ECS-73-S-7S-TR Crystal Equivalent & Substitute Parts

Part Overview

The ECS-73-S-7S-TR is a 7.3728 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 and substitute parts is necessary to support legacy systems, maintain production continuity for existing designs, and ensure component availability for repair and maintenance applications.

Substiute Parts

ECS-73-S-7S-TR

ECS Inc.In Stock: 768ECS-73-S-7S-TR Datasheet

Current PartRFQ

ECS-73-S-7SX-TR

ECS Inc.In Stock: 2644ECS-73-S-7SX-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ECS-73-S-7S-TR is determined by the following critical parameters:

• Frequency: 7.3728 MHz (exact match required)
• Frequency Tolerance: ±30ppm (must meet or exceed this specification)
• Operating Mode: Fundamental
• Package / Case: 4-SOJ, 9.40mm pitch (mechanical and electrical compatibility)
• Mounting Type: Surface Mount
• Operating Temperature Range: -10°C ~ 70°C (minimum requirement)
• Load Capacitance: Series

The ECS-73-S-7SX-TR qualifies as a substitute based on matching all critical parameters. The primary difference is the ESR specification (100 Ohms versus 80 Ohms), which remains within acceptable operational tolerances for most circuit applications while providing improved compliance status.

Parameter Comparison

Engineering Selection Recommendations

The ECS-73-S-7SX-TR serves as the primary substitute for the ECS-73-S-7S-TR. Both components share identical frequency specifications, tolerance ratings, and mechanical dimensions, ensuring direct compatibility in existing circuit designs.

The ECS-73-S-7SX-TR offers improved regulatory compliance, meeting ROHS3 standards compared to the non-compliant status of the main part. This distinction is significant for applications subject to environmental regulations or procurement requirements mandating RoHS compliance.

The 20-ohm increase in ESR (from 80 Ohms to 100 Ohms) represents a minor electrical parameter variance. Circuit designs utilizing the original part should accommodate this specification difference through standard crystal oscillator circuit design practices.

Both parts carry "Not For New Designs" status, indicating they are legacy components. For new product development, consultation with ECS Inc. regarding current-generation alternatives is appropriate.

Frequently Asked Questions (FAQ)

Q: Can the ECS-73-S-7SX-TR be used as a direct replacement for the ECS-73-S-7S-TR?

A: Yes. Both parts share identical frequency (7.3728 MHz), frequency tolerance (±30ppm), package configuration (4-SOJ, 9.40mm pitch), and operating temperature range (-10°C ~ 70°C). The ESR difference (100 Ohms versus 80 Ohms) does not prevent functional substitution in standard applications.

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

A: ESR affects crystal oscillator circuit performance, including startup time and power consumption. The 20-ohm increase in the substitute part is within typical design margins for fundamental-mode crystals and should not impact circuit operation in most applications.

Q: Are there compliance differences between these parts?

A: Yes. The ECS-73-S-7SX-TR is ROHS3 compliant, while the ECS-73-S-7S-TR is RoHS non-compliant. Both are REACH Unaffected. For applications requiring RoHS compliance, the substitute part is the appropriate selection.

Q: Do these parts have identical mechanical dimensions?

A: Yes. Both parts are housed in 4-SOJ packages with 9.40mm pitch, measuring 0.492" L x 0.181" W (12.50mm x 4.60mm) with a maximum seated height of 0.146" (3.70mm). They are mechanically interchangeable on PCBs designed for either part.

Q: What is the Moisture Sensitivity Level (MSL) for these crystals?

A: Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.