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

Part Overview

The ECS-122.8-S-7S-TR is a 12.288 MHz surface mount crystal oscillator in 4-SOJ package with 9.40mm pitch, designed for fundamental mode operation. This part carries a "Not For New Designs" status, indicating it has been superseded in the manufacturer's product line. Organizations using this component in active production or maintenance applications require equivalent alternatives that maintain electrical and mechanical compatibility while potentially offering improved compliance or availability.

Key Parameters

Parameter	Value
Frequency	12.288 MHz
Frequency Tolerance	±30ppm
Frequency Stability	±50ppm
ESR (Equivalent Series Resistance)	60 Ohms
Load Capacitance	Series
Operating Mode	Fundamental
Operating Temperature Range	-10°C ~ 70°C
Package / Case	4-SOJ, 9.40mm pitch
Size / Dimension	0.492" L x 0.181" W (12.50mm x 4.60mm)
Height - Seated (Max)	0.146" (3.70mm)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

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

Frequency: 12.288 MHz (exact match required)
Frequency Tolerance: ±30ppm (exact match required)
Operating Mode: Fundamental (exact match required)
Package / Case: 4-SOJ, 9.40mm pitch (exact match required)
Physical Dimensions: 0.492" L x 0.181" W, 0.146" max height (exact match required)
Operating Temperature Range: -10°C ~ 70°C (exact match required)
Mounting Type: Surface Mount (exact match required)

The ESR parameter may vary within acceptable limits for circuit operation, provided the substitute part maintains electrical performance within the specified frequency tolerance and stability range. The ECS-122.8-S-7SX-TR meets all substitution criteria while offering improved product status and compliance characteristics.

Parameter Comparison

Parameter	ECS-122.8-S-7S-TR (Main Part)	ECS-122.8-S-7SX-TR (Substitute)
Manufacturer	ECS Inc.	ECS Inc.
Frequency	12.288 MHz	12.288 MHz
Frequency Tolerance	±30ppm	±30ppm
Frequency Stability	±50ppm	±50ppm
ESR (Equivalent Series Resistance)	60 Ohms	50 Ohms
Load Capacitance	Series	Series
Operating Mode	Fundamental	Fundamental
Operating Temperature Range	-10°C ~ 70°C	-10°C ~ 70°C
Package / Case	4-SOJ, 9.40mm pitch	4-SOJ, 9.40mm pitch
Size / Dimension	0.492" L x 0.181" W (12.50mm x 4.60mm)	0.492" L x 0.181" W (12.50mm x 4.60mm)
Height - Seated (Max)	0.146" (3.70mm)	0.146" (3.70mm)
Mounting Type	Surface Mount	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Not For New Designs	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant
Packaging	Tape & Reel (TR)	Cut Tape (CT)

Engineering Selection Recommendations

The ECS-122.8-S-7SX-TR is the direct substitute for the ECS-122.8-S-7S-TR. Both parts maintain identical electrical specifications for frequency, tolerance, stability, and operating temperature range. The substitute part offers two significant advantages:

Product Status: The ECS-122.8-S-7SX-TR carries Active status, ensuring continued manufacturer support and long-term availability, whereas the main part is designated Not For New Designs.

Compliance: The ECS-122.8-S-7SX-TR is ROHS3 Compliant, meeting current environmental and regulatory requirements. The main part is RoHS non-compliant.

The ESR difference (50 Ohms versus 60 Ohms) represents an improvement in the substitute part, reducing series resistance while maintaining full electrical compatibility within the specified frequency tolerance and stability parameters.

Frequently Asked Questions (FAQ)

Q: Can the ECS-122.8-S-7SX-TR be used as a direct replacement for the ECS-122.8-S-7S-TR?

A: Yes. Both parts share identical frequency (12.288 MHz), frequency tolerance (±30ppm), frequency stability (±50ppm), operating mode (Fundamental), package type (4-SOJ, 9.40mm pitch), physical dimensions, and operating temperature range (-10°C ~ 70°C). The substitute part features lower ESR (50 Ohms versus 60 Ohms), which is electrically favorable.

Q: What is the significance of the "Not For New Designs" status on the main part?

A: This designation indicates the manufacturer has discontinued active development and support for the ECS-122.8-S-7S-TR. For new applications or ongoing production, the Active-status ECS-122.8-S-7SX-TR is the appropriate selection to ensure long-term availability and manufacturer support.

Q: Does the RoHS compliance difference affect substitution?

A: The ECS-122.8-S-7SX-TR is ROHS3 Compliant, while the main part is RoHS non-compliant. For applications subject to RoHS regulations or customer requirements, the substitute part satisfies compliance obligations. Both parts are electrically equivalent for circuit operation.

Q: Are the packaging formats interchangeable?

A: The main part is supplied in Tape & Reel (TR) format, while the substitute is supplied in Cut Tape (CT) format. Both formats contain the same component in the same package. Format selection depends on production volume and assembly equipment compatibility, not electrical performance.

Q: What does the lower ESR of the substitute part mean for circuit design?

A: ESR (Equivalent Series Resistance) of 50 Ohms in the substitute part versus 60 Ohms in the main part represents reduced internal resistance. This is electrically favorable and does not create compatibility issues. The substitute part will perform within or better than the specified frequency tolerance and stability parameters.

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