CS11338-25M Equivalent & Substitute Parts

Part Overview

The CS11338-25M is a 25 MHz fundamental mode crystal oscillator manufactured by NDK America, Inc., designed for surface mount applications in the NX3225SA series. This active product operates across a temperature range of -20°C to 70°C with a load capacitance of 18pF and an ESR of 50 Ohms. The part is packaged in a 4-SMD, No Lead configuration measuring 3.20mm x 2.50mm with a maximum seated height of 0.60mm.

Substitute parts are identified when they maintain compatibility across critical electrical and mechanical parameters including frequency, load capacitance, package type, and mounting configuration, while meeting or exceeding the original specifications for frequency stability and operating temperature range.

Substiute Parts

CS11338-25M

NDK America, Inc.In Stock: 2135CS11338-25M Datasheet

Current PartRFQ

ECS-250-18-33B-CKY-TR

ECS Inc.In Stock: 25854ECS-250-18-33B-CKY-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CS11338-25M is determined by strict alignment of the following critical parameters:

• Frequency: 25 MHz (exact match required)
• Load Capacitance: 18pF (exact match required)
• Operating Mode: Fundamental (exact match required)
• Package / Case: 4-SMD, No Lead (exact match required)
• Size / Dimension: 3.20mm x 2.50mm (exact match required)
• Mounting Type: Surface Mount (exact match required)

Substitute parts may vary in frequency stability, frequency tolerance, ESR, operating temperature range, and maximum seated height, provided these variations do not degrade system performance or violate design constraints. The ECS-250-18-33B-CKY-TR meets all critical substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

Both the CS11338-25M and ECS-250-18-33B-CKY-TR are active products with ROHS3 compliance and MSL 1 ratings, indicating equivalent environmental and regulatory standing. The ECS-250-18-33B-CKY-TR provides superior frequency stability (±10ppm versus ±50ppm) and an extended operating temperature range (-30°C to 85°C versus -20°C to 70°C), along with lower ESR (40 Ohms versus 50 Ohms). The maximum seated height difference of 0.20mm (0.80mm versus 0.60mm) must be evaluated against specific PCB layout and clearance constraints.

Selection between these parts depends on application-specific requirements for frequency accuracy, thermal operating envelope, and available board space. Both parts maintain identical frequency, load capacitance, package configuration, and physical footprint dimensions.

Frequently Asked Questions (FAQ)

Q: Can the ECS-250-18-33B-CKY-TR replace the CS11338-25M in all applications?

A: The ECS-250-18-33B-CKY-TR is electrically and mechanically compatible with the CS11338-25M for applications where the 0.20mm additional height and improved frequency stability do not conflict with design constraints. PCB clearance and frequency tolerance requirements must be verified for specific applications.

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

A: The CS11338-25M specifies ±50ppm frequency stability, while the ECS-250-18-33B-CKY-TR specifies ±10ppm. Lower frequency stability values indicate tighter frequency control. Applications requiring precise frequency accuracy benefit from the ECS part; applications with relaxed frequency tolerance requirements can use either part.

Q: Are there package or mounting differences between these parts?

A: Both parts use identical 4-SMD, No Lead packaging with 3.20mm x 2.50mm footprints and surface mount configuration. The ECS-250-18-33B-CKY-TR has a maximum seated height of 0.80mm compared to 0.60mm for the CS11338-25M. This difference must be considered in designs with limited vertical clearance.

Q: Do both parts meet the same compliance standards?

A: Both parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings and active product status, indicating equivalent regulatory and environmental compliance.

Q: What does ESR mean and why does it differ between these parts?

A: ESR (Equivalent Series Resistance) represents the internal resistance of the crystal. The CS11338-25M has 50 Ohms ESR while the ECS-250-18-33B-CKY-TR has 40 Ohms ESR. Lower ESR generally indicates better performance characteristics and is not a limiting factor for substitution.