ECS-50-20-7S-TR Crystal Equivalent & Substitute Parts

Part Overview

The ECS-50-20-7S-TR is a 5 MHz fundamental mode crystal oscillator in a 4-SOJ surface mount package with 20pF load capacitance and 120 Ohms equivalent series resistance (ESR). This component 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 operations, and inventory replenishment where original stock is depleted.

Substiute Parts

ECS-50-20-7S-TR

ECS Inc.In Stock: 2470ECS-50-20-7S-TR Datasheet

Current PartRFQ

ECS-50-20-7SX-TR

ECS Inc.In Stock: 3044ECS-50-20-7SX-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-50-20-7S-TR is determined by the following critical parameters:

• Frequency: Must be 5 MHz (exact match required)
• Frequency Tolerance: Must be ±30ppm or tighter
• Load Capacitance: Must be 20pF (exact match required)
• Operating Mode: Must be Fundamental
• Operating Temperature Range: Must cover or exceed -10°C ~ 70°C
• Package / Case: Must be 4-SOJ, 9.40mm pitch (mechanical and electrical compatibility)
• Mounting Type: Must be Surface Mount

The ESR parameter may vary within acceptable limits for circuit operation, provided the substitute part meets all other electrical and mechanical specifications. Compliance certifications (RoHS, REACH) are secondary considerations and do not disqualify a substitute from functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The ECS-50-20-7SX-TR is a direct functional substitute for the ECS-50-20-7S-TR. Both parts share identical electrical specifications for frequency, tolerance, load capacitance, and operating temperature range. The ESR difference (120 Ohms vs. 150 Ohms) falls within acceptable variation for most circuit applications using 5 MHz crystals with 20pF load capacitance.

The ECS-50-20-7SX-TR offers improved compliance status (ROHS3 Compliant vs. RoHS non-compliant), which may be advantageous for new procurement or systems with regulatory requirements. However, both parts carry "Not For New Designs" status, indicating they are legacy components suitable only for maintenance and repair of existing systems.

Selection between these parts should be based on inventory availability, compliance requirements of the target application, and ESR tolerance specifications of the receiving circuit.

Frequently Asked Questions (FAQ)

Q: Can the ECS-50-20-7SX-TR replace the ECS-50-20-7S-TR in existing designs?

A: Yes. The ECS-50-20-7SX-TR meets all critical electrical parameters: 5 MHz frequency, ±30ppm tolerance, 20pF load capacitance, and identical package dimensions. The ESR increase from 120 to 150 Ohms is a minor variation that does not affect functional compatibility in standard crystal oscillator circuits.

Q: What is the significance of the ESR difference between these parts?

A: ESR (Equivalent Series Resistance) affects crystal startup time and power consumption in oscillator circuits. The 30 Ohm difference (120 to 150 Ohms) is within typical design margins for 5 MHz crystals. Circuit validation should confirm ESR tolerance specifications if the application has strict power or startup requirements.

Q: Are these parts interchangeable at the PCB assembly level?

A: Yes. Both parts use identical 4-SOJ packages with 9.40mm pitch and matching physical dimensions (12.50mm x 4.60mm x 3.70mm max height). No PCB layout modifications are required for substitution.

Q: Why are both parts marked "Not For New Designs"?

A: This status indicates both the ECS-50-20-7S-TR and ECS-50-20-7SX-TR are legacy products. They are suitable for repair and maintenance of existing systems but should not be selected for new product development. Consult ECS Inc. for current-generation 5 MHz crystal alternatives if designing new systems.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS compliance is a material composition and environmental standard, not an electrical specification. The ROHS3 compliance of the ECS-50-20-7SX-TR does not alter its electrical characteristics compared to the RoHS non-compliant ECS-50-20-7S-TR. Selection based on compliance should reflect system-level regulatory requirements, not circuit performance.