ECS-36-18-4 Equivalent & Substitute Parts

Part Overview

The ECS-36-18-4 is a 3.6864 MHz through-hole crystal oscillator in HC-49/US package with 18pF load capacitance and 200 Ohms ESR. This part is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product line. Finding equivalent or substitute parts is necessary for ongoing support of legacy systems, maintenance applications, or when original stock becomes unavailable.

Substiute Parts

ECS-36-18-4

ECS Inc.In Stock: 3213ECS-36-18-4 Datasheet

Current PartRFQ

ECS-36-20-4VX

ECS Inc.In Stock: 1409ECS-36-20-4VX Datasheet

SimilarRFQ

ECS-36-18-4X

ECS Inc.In Stock: 31371ECS-36-18-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ECS-36-18-4 is determined by the following critical parameters:

• Frequency and Frequency Tolerance: Must match 3.6864 MHz at ±30ppm to ensure circuit timing compatibility
• Load Capacitance: Must be 18pF to maintain oscillation characteristics in the original circuit design
• ESR: Must be 200 Ohms to ensure proper circuit operation and startup conditions
• Package / Case: Must be HC-49/US for mechanical and electrical compatibility with existing PCB layouts
• Mounting Type: Must be Through Hole to fit existing board designs
• Operating Temperature Range: Must support -10°C ~ 70°C minimum to match application requirements

Two substitute parts meet these criteria with varying degrees of parametric alignment and product status differences.

Parameter Comparison

Engineering Selection Recommendations

ECS-36-18-4X is the primary parametric equivalent. It matches all critical electrical parameters (frequency, tolerance, load capacitance, and ESR) and maintains identical mechanical dimensions. The part is Active status with ROHS3 compliance and significantly higher inventory availability (31,360 pcs), making it the preferred direct replacement for the ECS-36-18-4.

ECS-36-20-4VX is a functional alternative with parametric deviations. The 20pF load capacitance differs from the original 18pF specification, and ESR is reduced to 150 Ohms. While frequency and tolerance remain identical, these parameter changes may affect circuit startup behavior and oscillation stability in designs optimized for 18pF/200 Ohms characteristics. This part is Active status with ROHS3 compliance and lower inventory (1,373 pcs). Selection of this part requires circuit-level evaluation of load capacitance tolerance margins.

Both substitute parts are ROHS3 compliant, addressing environmental compliance requirements absent in the original part.

Frequently Asked Questions (FAQ)

Q: Can ECS-36-18-4X be used as a direct replacement for ECS-36-18-4?

A: Yes. ECS-36-18-4X is a parametric equivalent with identical electrical specifications (3.6864 MHz, ±30ppm, 18pF, 200 Ohms) and mechanical package (HC-49/US through-hole). The primary difference is product status (Active vs. Not For New Designs) and improved RoHS compliance.

Q: What is the difference between ECS-36-18-4X and ECS-36-20-4VX?

A: Both parts share the same frequency and tolerance. ECS-36-18-4X maintains the original 18pF load capacitance and 200 Ohms ESR. ECS-36-20-4VX uses 20pF load capacitance and 150 Ohms ESR. Load capacitance affects oscillator startup and frequency stability; ESR affects power consumption and circuit damping. Selection depends on circuit design margins.

Q: Are all substitute parts in HC-49/US package?

A: Yes. All listed parts use HC-49/US package with through-hole mounting, ensuring mechanical compatibility with existing PCB layouts designed for ECS-36-18-4.

Q: What does "Not For New Designs" mean for the original part?

A: This status indicates the manufacturer has discontinued active development and recommends using alternative parts for new applications. For legacy system support or maintenance, the part remains functional but substitute parts with Active status are preferred for long-term availability.

Q: Do the substitute parts have better compliance ratings?

A: Yes. Both ECS-36-18-4X and ECS-36-20-4VX are ROHS3 compliant, while the original ECS-36-18-4 is RoHS non-compliant. This improves environmental and regulatory compliance for systems requiring RoHS certification.