ECS-80-20-4 8 MHz Crystal Equivalent & Substitute Parts

Part Overview

The ECS-80-20-4 is an 8 MHz through-hole crystal oscillator in HC-49/US package with 20pF load capacitance and 80 Ohms ESR. This part carries a "Not For New Designs" status, making equivalent and substitute parts necessary for ongoing production and new circuit implementations. The HC-49/US form factor and fundamental operating mode establish the baseline for compatible alternatives.

Substiute Parts

ECS-80-20-4

ECS Inc.In Stock: 3085ECS-80-20-4 Datasheet

Current PartRFQ

ECS-80-18-4

ECS Inc.In Stock: 1869ECS-80-18-4 Datasheet

SimilarRFQ

ECS-80-18-4X

ECS Inc.In Stock: 5882ECS-80-18-4X Datasheet

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ECS-80-20-4VX

ECS Inc.In Stock: 1181ECS-80-20-4VX Datasheet

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ECS-80-20-4X

ECS Inc.In Stock: 2366ECS-80-20-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-80-20-4 is determined by the following critical parameters:

• Frequency: Must be 8 MHz (exact match required)
• Frequency Tolerance: Must be ±30ppm or tighter
• ESR: Must be 80 Ohms (exact match required)
• Operating Mode: Must be Fundamental
• Package / Case: Must be HC-49/US
• Mounting Type: Must be Through Hole
• Operating Temperature Range: Must cover -10°C ~ 70°C minimum

Load capacitance (20pF vs. 18pF) represents a secondary parameter that affects circuit tuning but does not prevent functional substitution when circuit design accommodates the variation. Parts with 18pF load capacitance are listed as compatible alternatives due to their identical frequency, tolerance, ESR, and package specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Identical Load Capacitance - 20pF):

ECS-80-20-4X and ECS-80-20-4VX are direct parametric equivalents to ECS-80-20-4. Both maintain 20pF load capacitance, 8 MHz frequency, ±30ppm tolerance, and 80 Ohms ESR. Both parts carry Active product status and ROHS3 compliance, making them suitable for new designs and production environments requiring RoHS certification.

Secondary Substitutes (Alternate Load Capacitance - 18pF):

ECS-80-18-4 and ECS-80-18-4X share identical frequency, tolerance, ESR, and package specifications but specify 18pF load capacitance. These parts are compatible when circuit design accommodates load capacitance variation. ECS-80-18-4X offers Active status and ROHS3 compliance advantages over the legacy ECS-80-18-4.

Compliance Considerations:

For applications requiring RoHS3 compliance, select from ECS-80-20-4X, ECS-80-20-4VX, or ECS-80-18-4X. The original ECS-80-20-4 and ECS-80-18-4 are RoHS non-compliant and carry "Not For New Designs" designation.

Frequently Asked Questions (FAQ)

Q: Can ECS-80-18-4X replace ECS-80-20-4 directly?

A: ECS-80-18-4X is parametrically compatible for frequency, tolerance, ESR, and package. The 18pF load capacitance differs from the 20pF specification. Direct substitution is possible if circuit design accommodates load capacitance variation. Verify oscillator tuning range and load network design before implementation.

Q: What is the difference between ECS-80-20-4X and ECS-80-20-4VX?

A: Both parts maintain identical electrical parameters (8 MHz, ±30ppm, 20pF, 80 Ohms). ECS-80-20-4VX uses series HC-49USSX with maximum seated height of 0.083" (2.10mm), while ECS-80-20-4X uses series HC-49USX with maximum seated height of 0.138" (4.60mm). Physical dimensions differ; verify PCB layout clearance requirements.

Q: Are all substitute parts through-hole mounted?

A: Yes. All listed substitute parts maintain through-hole mounting in HC-49/US package configuration.

Q: Which substitute part offers the best compliance profile?

A: ECS-80-20-4X and ECS-80-18-4X both carry Active product status and ROHS3 compliance. ECS-80-20-4X maintains the original 20pF load capacitance specification. For new designs, ECS-80-20-4X is the recommended primary substitute.

Q: Does load capacitance affect frequency stability?

A: Load capacitance affects circuit tuning and frequency accuracy but does not change the crystal's intrinsic ±30ppm frequency tolerance specification. Circuit design must account for load capacitance when calculating final frequency accuracy.