ECS-120-20-4 12 MHz Crystal Equivalent & Substitute Parts

Part Overview

The ECS-120-20-4 is a 12 MHz through-hole crystal oscillator in HC-49/US package with 20pF load capacitance and 60 Ohms equivalent series resistance. This part carries a "Not For New Designs" status, making substitute parts necessary for ongoing production and new applications. The crystal operates in fundamental mode across a temperature range of -10°C to 70°C with ±30ppm frequency tolerance.

Substiute Parts

ECS-120-20-4

ECS Inc.In Stock: 1187ECS-120-20-4 Datasheet

Current PartRFQ

ECS-120-18-4VX

ECS Inc.In Stock: 1153ECS-120-18-4VX Datasheet

SimilarRFQ

ECS-120-20-4DN

ECS Inc.In Stock: 682ECS-120-20-4DN Datasheet

SimilarRFQ

ECS-120-20-4X

ECS Inc.In Stock: 12610ECS-120-20-4X Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-120-20-4 is determined by the following critical parameters:

• Frequency: Must be 12 MHz
• Load Capacitance: Must be 20pF (primary electrical requirement)
• ESR: Must be 60 Ohms
• Frequency Tolerance: Must be ±30ppm
• Operating Mode: Must be Fundamental
• Package / Case: Must be HC-49/US
• Mounting Type: Must be Through Hole

Three substitute parts meet these criteria with variations in product status, compliance certifications, and operating temperature ranges.

Parameter Comparison

Engineering Selection Recommendations

ECS-120-20-4X is the primary recommended substitute. It maintains identical electrical parameters (20pF load capacitance, ±30ppm tolerance, ±50ppm stability) and mechanical compatibility with the original part. This part carries Active product status and ROHS3 compliance, making it suitable for new designs and production environments requiring regulatory compliance.

ECS-120-18-4VX is a parametric equivalent with a critical difference: 18pF load capacitance instead of 20pF. This part is Active and ROHS3 compliant but requires circuit validation to confirm compatibility with the 2pF load capacitance difference. Use only when circuit design permits 18pF operation.

ECS-120-20-4DN maintains identical electrical and mechanical specifications to the original part but carries "Not For New Designs" status. It offers extended operating temperature range (-40°C ~ 85°C) and higher frequency stability tolerance (±100ppm). This part is suitable only for legacy system maintenance or applications requiring the extended temperature range where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can ECS-120-18-4VX replace ECS-120-20-4 directly?

A: ECS-120-18-4VX differs in load capacitance (18pF vs. 20pF). Direct substitution requires circuit validation. The 2pF difference may affect oscillation frequency and circuit stability depending on PCB layout and component tolerances. Consult circuit design specifications before implementation.

Q: What is the primary advantage of ECS-120-20-4X over the original part?

A: ECS-120-20-4X maintains all critical electrical parameters while offering Active product status and ROHS3 compliance. It is the recommended choice for new designs and production environments requiring regulatory compliance.

Q: When should ECS-120-20-4DN be selected?

A: ECS-120-20-4DN is appropriate for legacy system maintenance or applications requiring extended operating temperature range (-40°C ~ 85°C). It is not recommended for new designs due to its "Not For New Designs" status.

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

A: Yes. All substitute parts use HC-49/US package with through-hole mounting. Physical dimensions are equivalent, ensuring PCB footprint compatibility.

Q: What compliance certifications differ among these parts?

A: ECS-120-20-4X and ECS-120-18-4VX are ROHS3 compliant. ECS-120-20-4 and ECS-120-20-4DN are RoHS non-compliant. Select ROHS3 compliant parts for applications requiring regulatory compliance.