CS10-40.000MABJ-UT 40 MHz Crystal Equivalent & Substitute Parts

Part Overview

The CS10-40.000MABJ-UT is a 40 MHz fundamental mode crystal oscillator manufactured by Citizen Finedevice Co Ltd, designed for surface mount applications with 18pF load capacitance and 50 Ohms equivalent series resistance. This part is classified as obsolete, necessitating identification of active substitute components that maintain electrical and mechanical compatibility for continued system support and new design implementations.

Substiute Parts

CS10-40.000MABJ-UT

Citizen Finedevice Co LtdIn Stock: 1154CS10-40.000MABJ-UT Datasheet

Current PartRFQ

ABM7-40.000MHZ-D2Y-F-T

Abracon LLCIn Stock: 1529ABM7-40.000MHZ-D2Y-F-T Datasheet

DirectRFQ

ECS-400-18-23A-EN-TR

ECS Inc.In Stock: 13390ECS-400-18-23A-EN-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CS10-40.000MABJ-UT are selected based on the following critical parameters that determine functional and mechanical compatibility:

• Frequency: Must be 40 MHz
• Load Capacitance: Must be 18pF
• Package / Case: Must be 2-SMD, No Lead
• Size / Dimension: Must be 0.236" L x 0.138" W (6.00mm x 4.60mm)
• Mounting Type: Must be Surface Mount
• Operating Mode: Must be Fundamental

The identified substitute parts meet all these core requirements. Variations in frequency tolerance, ESR, operating temperature range, and product status are documented for engineering evaluation but do not preclude substitution when the critical parameters align.

Parameter Comparison

Engineering Selection Recommendations

ABM7-40.000MHZ-D2Y-F-T (Abracon LLC): This substitute offers active product status with ROHS3 compliance and an extended operating temperature range of -40°C to 85°C. The frequency tolerance of ±20ppm is tighter than the original part, and frequency stability of ±30ppm provides improved performance margins. Height-seated dimension of 0.055" (1.40mm) is slightly elevated compared to the original 0.039" (1.00mm); PCB layout clearance verification is required for space-constrained applications.

ECS-400-18-23A-EN-TR (ECS Inc.): This substitute maintains active product status with ROHS3 compliance and an extended operating temperature range of -40°C to 85°C. ESR of 30 Ohms is lower than the original 50 Ohms specification, which may reduce power consumption in oscillator circuits. Height-seated dimension of 0.043" (1.10mm) is comparable to the original part. REACH Unaffected status aligns with the original part's regulatory profile.

Both substitutes maintain identical frequency, load capacitance, package type, and physical footprint dimensions, ensuring direct mechanical and electrical compatibility within the specified parameter tolerances.

Frequently Asked Questions (FAQ)

Q: Can ABM7-40.000MHZ-D2Y-F-T be used as a direct replacement for CS10-40.000MABJ-UT?

A: Yes, the ABM7-40.000MHZ-D2Y-F-T meets all critical electrical and mechanical parameters: 40 MHz frequency, 18pF load capacitance, 50 Ohms ESR, 2-SMD No Lead package, and 6.00mm x 4.60mm footprint. The increased height of 0.055" (1.40mm) versus 0.039" (1.00mm) requires verification of PCB clearance in height-constrained designs.

Q: Can ECS-400-18-23A-EN-TR be used as a direct replacement for CS10-40.000MABJ-UT?

A: Yes, the ECS-400-18-23A-EN-TR meets all critical electrical and mechanical parameters: 40 MHz frequency, 18pF load capacitance, 2-SMD No Lead package, and 6.00mm x 4.60mm footprint. The ESR specification of 30 Ohms differs from the original 50 Ohms; circuit performance should be evaluated for oscillator startup and power consumption characteristics.

Q: What is the primary difference between the two substitute parts?

A: The ABM7-40.000MHZ-D2Y-F-T maintains the original 50 Ohms ESR specification with tighter frequency tolerance (±20ppm), while the ECS-400-18-23A-EN-TR features lower ESR at 30 Ohms with matching frequency tolerance (±30ppm). Both offer extended operating temperature ranges and active product status.

Q: Are there any compliance or regulatory differences between the substitutes?

A: Both substitutes are ROHS3 compliant. The ABM7-40.000MHZ-D2Y-F-T is REACH Affected, while the ECS-400-18-23A-EN-TR is REACH Unaffected, matching the original part's regulatory profile. Application-specific compliance requirements should be evaluated.

Q: What should be considered when selecting between the two substitutes?

A: Selection depends on circuit requirements: choose ABM7-40.000MHZ-D2Y-F-T for applications requiring tighter frequency tolerance and matching ESR characteristics; choose ECS-400-18-23A-EN-TR for applications where lower ESR may reduce power consumption or where REACH Unaffected status is required. PCB layout clearance must be verified for both parts due to height variations.