ECS-184-S-4 18.432 MHz Crystal Equivalent & Substitute Parts

Part Overview

The ECS-184-S-4 is a 18.432 MHz through-hole crystal oscillator in HC-49/US package, designed for fundamental mode operation with 40 Ohms equivalent series resistance. This part carries a "Not For New Designs" status, indicating it has been superseded in the manufacturer's product line. Identifying equivalent and substitute parts is necessary to support legacy system maintenance, repair operations, and design transitions to active product alternatives.

Substiute Parts

ECS-184-S-4

ECS Inc.In Stock: 959ECS-184-S-4 Datasheet

Current PartRFQ

ECS-184-S-4X

ECS Inc.In Stock: 1219ECS-184-S-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-184-S-4 is determined by strict parametric matching across the following critical criteria:

Mandatory Matching Parameters:

• Frequency: 18.432 MHz (exact match required)
• Frequency Tolerance: ±30ppm (substitute must not exceed this deviation)
• Frequency Stability: ±50ppm (substitute must not exceed this variation)
• ESR: 40 Ohms (substitute must match this impedance specification)
• Operating Mode: Fundamental (substitute must operate in fundamental mode)
• Package / Case: HC-49/US (substitute must use identical package)
• Mounting Type: Through Hole (substitute must use through-hole configuration)
• Operating Temperature Range: -10°C ~ 70°C (substitute must support this range)
• Load Capacitance: Series (substitute must use series load configuration)

The ECS-184-S-4X meets all mandatory matching parameters and qualifies as a parametric equivalent. The primary distinction is product status: ECS-184-S-4X is Active, whereas ECS-184-S-4 is Not For New Designs.

Parameter Comparison

Engineering Selection Recommendations

The ECS-184-S-4X is the direct parametric equivalent for the ECS-184-S-4. All electrical and mechanical specifications match exactly, ensuring pin-for-pin and functional compatibility in existing circuit designs.

Product Status Consideration: The ECS-184-S-4 carries "Not For New Designs" status, indicating end-of-life or transition phase. The ECS-184-S-4X is designated Active, making it the recommended choice for ongoing production, repair, and new design implementations.

Compliance Advantage: The ECS-184-S-4X achieves ROHS3 compliance, whereas the ECS-184-S-4 is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, the ECS-184-S-4X is the appropriate selection.

Availability: Current inventory shows 1163 units of ECS-184-S-4X available versus 941 units of ECS-184-S-4, supporting supply chain continuity with the active product variant.

Frequently Asked Questions (FAQ)

Q: Can the ECS-184-S-4X be used as a direct replacement for the ECS-184-S-4?

A: Yes. The ECS-184-S-4X is a parametric equivalent with identical electrical specifications (18.432 MHz, ±30ppm tolerance, ±50ppm stability, 40 Ohms ESR) and mechanical package (HC-49/US through-hole). Direct board-level substitution is supported without circuit modification.

Q: What is the difference between the ECS-184-S-4 and ECS-184-S-4X?

A: The primary differences are product status and regulatory compliance. The ECS-184-S-4 is marked "Not For New Designs" and is RoHS non-compliant. The ECS-184-S-4X is Active and ROHS3 compliant. All functional parameters are identical.

Q: Why is the ECS-184-S-4 marked "Not For New Designs"?

A: This designation indicates the part has been superseded in the manufacturer's active product portfolio. The ECS-184-S-4X represents the current active equivalent. Existing designs using ECS-184-S-4 can transition to ECS-184-S-4X without technical modification.

Q: Are there any compatibility concerns when switching from ECS-184-S-4 to ECS-184-S-4X?

A: No compatibility concerns exist. Both parts share identical frequency, tolerance, stability, ESR, package, and mounting specifications. The HC-49/US through-hole package dimensions and electrical interface are identical.

Q: Does the RoHS compliance difference affect circuit performance?

A: RoHS compliance relates to material composition and environmental regulations, not electrical performance. Both parts meet identical electrical specifications and operate identically in circuit applications. The RoHS3 compliance of ECS-184-S-4X is advantageous for regulated markets and customer requirements.

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

A: Both the ECS-184-S-4 and ECS-184-S-4X operate across -10°C to 70°C. Frequency stability of ±50ppm is maintained within this temperature range.

Q: Can these crystals be used interchangeably in legacy equipment repair?

A: Yes. For repair and maintenance of equipment originally designed with ECS-184-S-4, the ECS-184-S-4X provides identical functional performance and is the recommended choice due to active product status and improved compliance.