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

Part Overview

The ECS-120-20-4DN 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 is classified as "Not For New Designs," indicating it has reached end-of-life status. Finding equivalent or substitute parts is necessary for legacy system maintenance, repair applications, and designs requiring pin-compatible replacements with matching electrical characteristics.

Substiute Parts

ECS-120-20-4DN

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

Current PartRFQ

ECS-120-20-4

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

SimilarRFQ

ECS-120-20-4XDN

ECS Inc.In Stock: 1251ECS-120-20-4XDN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Frequency: Must be 12 MHz (exact match required)
• Load Capacitance: Must be 20pF (exact match required)
• ESR: Must be 60 Ohms (exact match required)
• Package / Case: Must be HC-49/US (physical and electrical compatibility)
• Mounting Type: Must be Through Hole (board assembly compatibility)
• Operating Mode: Must be Fundamental (circuit design compatibility)

The substitute parts identified below meet all critical electrical and mechanical parameters. Variations in frequency stability and operating temperature range are noted but do not prevent functional substitution when application requirements permit.

Parameter Comparison

Engineering Selection Recommendations

ECS-120-20-4XDN is the preferred substitute for new applications and legacy replacements. This part maintains identical electrical specifications (12 MHz, ±30ppm tolerance, 20pF load capacitance, 60 Ohms ESR) and physical dimensions while offering superior product status (Active) and ROHS3 compliance. The extended operating temperature range (-40°C ~ 85°C) matches the original ECS-120-20-4DN specification.

ECS-120-20-4 is a functional equivalent with identical electrical parameters and physical package. However, this part carries "Not For New Designs" status and is RoHS non-compliant. The operating temperature range (-10°C ~ 70°C) is narrower than the original specification and may not be suitable for applications requiring the full -40°C ~ 85°C range. This part is suitable only for direct replacement in existing legacy systems where temperature constraints are not a limiting factor.

Frequently Asked Questions (FAQ)

Q: Can ECS-120-20-4XDN directly replace ECS-120-20-4DN on existing PCBs?

A: Yes. Both parts use identical HC-49/US through-hole package dimensions (0.447" L x 0.183" W, 4.60mm max height) and share all critical electrical parameters (12 MHz, ±30ppm tolerance, 20pF load capacitance, 60 Ohms ESR). Pin-to-pin compatibility is assured.

Q: What is the difference between ECS-120-20-4 and ECS-120-20-4XDN?

A: Both parts meet the core electrical specifications. Key differences are: ECS-120-20-4XDN has Active product status and ROHS3 compliance, while ECS-120-20-4 is marked "Not For New Designs" and is RoHS non-compliant. ECS-120-20-4XDN maintains the full -40°C ~ 85°C operating range; ECS-120-20-4 is limited to -10°C ~ 70°C.

Q: Are there any compliance considerations when substituting these parts?

A: ECS-120-20-4XDN is ROHS3 compliant, while both ECS-120-20-4DN and ECS-120-20-4 are RoHS non-compliant. If your application or regulatory requirements mandate RoHS compliance, ECS-120-20-4XDN is the only suitable option among these three parts.

Q: Does frequency stability difference affect circuit operation?

A: Frequency stability (±50ppm vs ±100ppm) describes long-term drift characteristics and does not affect immediate functional compatibility. Both ECS-120-20-4 and ECS-120-20-4XDN meet the ±30ppm frequency tolerance specification required for circuit design. Selection should be based on application requirements for long-term frequency accuracy.

Q: Can I use ECS-120-20-4 in applications requiring -40°C operation?

A: No. ECS-120-20-4 is rated only to -10°C minimum operating temperature. For applications requiring -40°C ~ 85°C operation, use ECS-120-20-4XDN, which matches the original ECS-120-20-4DN temperature specification.