ECS-184-S-7S-TR Crystal Equivalent & Substitute Parts

Part Overview

The ECS-184-S-7S-TR is an 18.432 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. The part operates in fundamental mode with ±30ppm frequency tolerance and 40 Ohms equivalent series resistance (ESR). Due to its obsolescence status, identifying functionally compatible substitute parts is essential for ongoing production support and legacy system maintenance.

Substiute Parts

ECS-184-S-7S-TR

ECS Inc.In Stock: 2618ECS-184-S-7S-TR Datasheet

Current PartRFQ

ECS-184-S-7SX-TR

ECS Inc.In Stock: 2748ECS-184-S-7SX-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-184-S-7S-TR is determined by the following critical parameters:

• Frequency: 18.432 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Package / Case: 4-SOJ, 9.40mm pitch (exact match required for PCB compatibility)
• Operating Temperature Range: -10°C ~ 70°C (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Physical Dimensions: 0.492" L x 0.181" W, Height 0.146" max (exact match required)

The ECS-184-S-7SX-TR qualifies as a substitute because it maintains identical frequency, tolerance, package geometry, and operating parameters. The primary difference is ESR (50 Ohms vs. 40 Ohms), which represents a 25% increase but remains within acceptable circuit design margins for most applications using this frequency standard.

Parameter Comparison

Engineering Selection Recommendations

The ECS-184-S-7SX-TR serves as the primary substitute for the obsolete ECS-184-S-7S-TR. Both parts maintain identical electrical specifications for frequency, tolerance, and stability, ensuring functional compatibility in existing circuit designs.

The ECS-184-S-7SX-TR offers an additional compliance advantage: it is ROHS3 compliant, whereas the original part is RoHS non-compliant. This makes the substitute preferable for new production runs or systems subject to RoHS regulatory requirements.

The 10 Ohm increase in ESR (from 40 to 50 Ohms) is a minor variation that does not affect the core frequency-generation function. Circuit designs using the original part will operate identically with the substitute, provided the oscillator circuit was designed with standard component tolerances.

Both parts share identical physical dimensions, package geometry, and mounting specifications, ensuring direct PCB-level compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the ECS-184-S-7SX-TR be used as a direct replacement for the ECS-184-S-7S-TR?

A: Yes. Both parts operate at 18.432 MHz with ±30ppm tolerance, identical package geometry (4-SOJ, 9.40mm pitch), and matching physical dimensions. The ESR difference (50 Ohms vs. 40 Ohms) does not prevent functional substitution in standard oscillator circuits.

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

A: ESR (Equivalent Series Resistance) affects oscillator startup time and power consumption. The 10 Ohm increase in the substitute part represents a 25% rise but remains within acceptable operating margins for most applications. Circuit performance will remain stable.

Q: Are there any compliance differences between the main part and substitute?

A: Yes. The ECS-184-S-7SX-TR is ROHS3 compliant, while the ECS-184-S-7S-TR is RoHS non-compliant. For applications requiring RoHS compliance, the substitute is the appropriate choice.

Q: Will the substitute part require PCB layout changes?

A: No. Both parts have identical physical dimensions (0.492" L x 0.181" W, 0.146" max height) and the same 4-SOJ package with 9.40mm pitch. No PCB modifications are necessary.

Q: What is the operating temperature range for both parts?

A: Both the main part and substitute operate across -10°C to 70°C, ensuring compatibility in equivalent thermal environments.

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

A: Yes. Both are supplied in Tape & Reel (TR) packaging with MSL 1 (Unlimited) moisture sensitivity rating.