ECS-240-20-7S-TR Equivalent & Substitute Parts

Part Overview

The ECS-240-20-7S-TR is a 24 MHz fundamental mode crystal oscillator in 4-SOJ surface mount package with 20pF load capacitance and 30 Ohms equivalent series resistance. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identifying equivalent and substitute parts is necessary for legacy system maintenance, repair operations, and inventory management where continued supply of the original part number is limited or unavailable.

Substiute Parts

ECS-240-20-7S-TR

ECS Inc.In Stock: 1508ECS-240-20-7S-TR Datasheet

Current PartRFQ

ECS-240-16-7S-TR

ECS Inc.In Stock: 3112ECS-240-16-7S-TR Datasheet

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ECS-240-18-7SX-TR

ECS Inc.In Stock: 6951ECS-240-18-7SX-TR Datasheet

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ECS-240-20-7SX-TR

ECS Inc.In Stock: 3006ECS-240-20-7SX-TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of 24 MHz crystal oscillators is determined by the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 24 MHz (all substitutes must maintain this exact frequency)
• Frequency Tolerance: ±30ppm (all substitutes maintain this specification)
• Package / Case: 4-SOJ, 9.40mm pitch (physical and electrical compatibility)
• Mounting Type: Surface Mount (PCB assembly compatibility)
• Operating Temperature Range: -10°C ~ 70°C (thermal envelope)

Variable Parameters Allowing Substitution:

• Load Capacitance: 16pF, 18pF, or 20pF (circuit-dependent; selection based on application requirements)
• ESR: 30 Ohms or 50 Ohms (affects oscillator startup and drive level; higher ESR values require circuit evaluation)
• Series Designation: ECX-3S or ECX-3SX (internal design variant)
• RoHS Compliance: Non-compliant or ROHS3 Compliant (regulatory requirement dependent)

Parameter Comparison

Engineering Selection Recommendations

For RoHS Non-Compliant Applications: ECS-240-16-7S-TR and ECS-240-20-7S-TR maintain the ECX-3S series designation and 30 Ohms ESR specification. Selection between 16pF and 20pF load capacitance depends on circuit design requirements. ECS-240-16-7S-TR offers higher inventory availability (3008 units).

For ROHS3 Compliant Applications: ECS-240-18-7SX-TR and ECS-240-20-7SX-TR are ROHS3 compliant alternatives. Both operate with 50 Ohms ESR, requiring circuit verification for oscillator startup margin and drive level compatibility. ECS-240-18-7SX-TR provides the highest inventory level (6865 units) and represents the most readily available substitute.

Load Capacitance Selection: The choice between 16pF, 18pF, and 20pF load capacitance is application-specific and determined by the crystal oscillator circuit design. Substitution with a different load capacitance value requires verification that the application circuit can accommodate the alternative specification.

Frequently Asked Questions (FAQ)

Q: Can ECS-240-16-7S-TR replace ECS-240-20-7S-TR directly? A: Direct replacement is possible only if the application circuit is designed to operate with 16pF load capacitance. Load capacitance affects oscillation frequency and circuit stability. Circuit verification is required before substitution.

Q: What is the difference between ECX-3S and ECX-3SX series? A: ECX-3S series components are RoHS non-compliant with 30 Ohms ESR. ECX-3SX series components are ROHS3 compliant with 50 Ohms ESR. The higher ESR in ECX-3SX may affect oscillator startup characteristics and requires circuit evaluation.

Q: Can I substitute a 50 Ohms ESR part for a 30 Ohms ESR part? A: Substitution requires circuit analysis. Higher ESR increases power consumption and may affect oscillator startup margin. The application circuit must be verified to ensure stable oscillation with the higher ESR value.

Q: Are all substitute parts in the same 4-SOJ package? A: Yes. All listed substitute parts use the 4-SOJ, 9.40mm pitch package with identical physical dimensions (12.50mm L x 4.60mm W x 3.70mm H max), ensuring PCB footprint compatibility.

Q: Which substitute offers the best availability? A: ECS-240-18-7SX-TR has the highest inventory level at 6865 units. This part is ROHS3 compliant and operates with 18pF load capacitance and 50 Ohms ESR.