ECS-122.8-20-7S-TR Equivalent & Substitute Parts

Part Overview

The ECS-122.8-20-7S-TR is a 12.288 MHz crystal oscillator manufactured by ECS Inc., designed for surface mount applications in the 4-SOJ package format. This part operates at a fundamental frequency with 20pF load capacitance and 60 Ohms equivalent series resistance. The component is currently in active production status and available in cut tape packaging with 1277 pieces in stock.

Substitute parts are necessary when the original specification becomes unavailable, when alternative packaging formats are required, or when design revisions call for updated component series with enhanced compliance certifications.

Substiute Parts

ECS-122.8-20-7S-TR

ECS Inc.In Stock: 1327ECS-122.8-20-7S-TR Datasheet

Current PartRFQ

ECS-122.8-18-7SX-TR

ECS Inc.In Stock: 6423ECS-122.8-18-7SX-TR Datasheet

SimilarRFQ

ECS-122.8-20-7SX-TR

ECS Inc.In Stock: 1540ECS-122.8-20-7SX-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ECS-122.8-20-7S-TR is determined by the following critical parameters:

• Frequency: 12.288 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Load Capacitance: 20pF (exact match required)
• Operating Mode: Fundamental (exact match required)
• Package / Case: 4-SOJ, 9.40mm pitch (exact match required)
• Operating Temperature Range: -10°C to 70°C (exact match required)

Variations in ESR (Equivalent Series Resistance) and series designation (7S vs. 7SX) are permitted within the substitute group, provided all critical parameters remain unchanged. Packaging format (Cut Tape vs. Tape & Reel) may differ based on procurement requirements.

Parameter Comparison

Engineering Selection Recommendations

ECS-122.8-20-7SX-TR is a direct substitute for the ECS-122.8-20-7S-TR when identical load capacitance (20pF) is required. This part maintains all critical electrical parameters while offering ROHS3 compliance and a lower ESR specification (50 Ohms vs. 60 Ohms). The 7SX series designation indicates an updated component line. This part is marked "Not For New Designs," indicating it may have limited long-term availability.

ECS-122.8-18-7SX-TR is a substitute only when the circuit design permits a load capacitance reduction from 20pF to 18pF. This part offers the highest inventory availability (6409 pieces) and ROHS3 compliance. The lower load capacitance may require circuit tuning adjustments and is not interchangeable without design verification.

For new designs requiring RoHS compliance, ECS-122.8-20-7SX-TR is the preferred option among available substitutes. For applications where the original ECS-122.8-20-7S-TR is specified and RoHS non-compliance is acceptable, direct substitution with ECS-122.8-20-7SX-TR is not recommended due to its "Not For New Designs" status.

Frequently Asked Questions (FAQ)

Q: Can ECS-122.8-20-7SX-TR replace ECS-122.8-20-7S-TR directly?

A: Yes, ECS-122.8-20-7SX-TR is a direct electrical substitute. Both parts share identical frequency (12.288 MHz), frequency tolerance (±30ppm), load capacitance (20pF), operating mode (Fundamental), package (4-SOJ, 9.40mm pitch), and operating temperature range (-10°C to 70°C). The ESR difference (50 Ohms vs. 60 Ohms) is within acceptable variation for crystal oscillator applications. Packaging format differs (Tape & Reel vs. Cut Tape), which may affect procurement logistics but not electrical performance.

Q: Is ECS-122.8-18-7SX-TR compatible with designs specified for 20pF load capacitance?

A: No. ECS-122.8-18-7SX-TR operates at 18pF load capacitance, which differs from the 20pF specification of the main part. Load capacitance directly affects crystal frequency and circuit resonance. Substitution requires circuit design verification and potential tuning adjustments. This part is not a direct replacement without engineering review.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape packaging provides individual component strips suitable for manual handling and small-quantity applications. Tape & Reel packaging provides continuous reels for automated assembly processes and high-volume production. Both formats contain identical components; packaging selection depends on assembly method and order quantity requirements.

Q: Why are ECS-122.8-20-7SX-TR and ECS-122.8-18-7SX-TR marked "Not For New Designs"?

A: This designation indicates that these parts are in mature or transitional product lines and may have limited future availability or support. For new design projects, ECS Inc. may recommend alternative current-generation components. Existing designs using these parts may continue to source them, but new projects should evaluate current-status alternatives.

Q: What is the impact of RoHS compliance differences?

A: ECS-122.8-20-7S-TR is RoHS non-compliant, while ECS-122.8-20-7SX-TR and ECS-122.8-18-7SX-TR are ROHS3 compliant. RoHS compliance affects regulatory acceptance in specific markets and end-use applications. Selection depends on target market requirements and regulatory obligations. Both compliant and non-compliant parts are electrically equivalent for circuit operation.