CS20-7.3728MABJ-UT Equivalent & Substitute Parts

Part Overview

The CS20-7.3728MABJ-UT is a 7.3728 MHz crystal oscillator manufactured by Citizen Finedevice Co Ltd, designed for fundamental mode operation in surface mount applications. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing production support, design updates, and inventory management. The part operates across a temperature range of -10°C to 60°C with 18pF load capacitance and 100 Ohms equivalent series resistance.

Substiute Parts

CS20-7.3728MABJ-UT

Citizen Finedevice Co LtdIn Stock: 784CS20-7.3728MABJ-UT Datasheet

Current PartRFQ

ABC2-7.3728MHZ-4-T

Abracon LLCIn Stock: 13108ABC2-7.3728MHZ-4-T Datasheet

DirectRFQ

ECS-73-20-19A-TR

ECS Inc.In Stock: 20301ECS-73-20-19A-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CS20-7.3728MABJ-UT is determined by the following critical parameters:

Primary Matching Criteria:

• Frequency: 7.3728 MHz (exact match required)
• Frequency Tolerance: ±30ppm (exact match required)
• Load Capacitance: 18pF (exact match required)
• Operating Mode: Fundamental (exact match required)
• Mounting Type: Surface Mount (exact match required)

Secondary Compatibility Parameters:

• ESR (Equivalent Series Resistance): 100 Ohms (preferred match; variations within ±50% acceptable for circuit compatibility)
• Operating Temperature Range: -10°C to 60°C minimum (equal or extended range acceptable)
• Package / Case: 4-SMD, No Lead (preferred; alternative SMD packages acceptable if footprint compatible)

Two substitute parts meet the primary matching criteria with documented compatibility:

1. ABC2-7.3728MHZ-4-T (Abracon LLC): Direct match on frequency, tolerance, load capacitance, and operating mode. ESR is 50 Ohms (lower than original). Package is 4-SMD, No Lead. Product status is Active.

2. ECS-73-20-19A-TR (ECS Inc.): Matches frequency, tolerance, and operating mode. Load capacitance is 20pF (2pF higher than original). Package is 2-SMD, No Lead (different from original 4-SMD). Product status is Active.

Parameter Comparison

Engineering Selection Recommendations

ABC2-7.3728MHZ-4-T (Abracon LLC) is the primary substitute for the CS20-7.3728MABJ-UT. This part provides exact matching on all primary criteria: frequency, tolerance, load capacitance, and package configuration. The lower ESR of 50 Ohms compared to the original 100 Ohms represents improved performance characteristics. The part is Active status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The identical operating temperature range and 4-SMD package configuration enable direct replacement without circuit redesign or PCB layout modification.

ECS-73-20-19A-TR (ECS Inc.) is a secondary substitute option. While it matches frequency and tolerance specifications, the 20pF load capacitance (versus 18pF original) and 2-SMD package (versus 4-SMD original) require circuit verification and potential PCB layout adjustment. This part is suitable only when the 2pF load capacitance variance is acceptable within the application's frequency stability requirements and when PCB footprint compatibility can be confirmed. The extended operating temperature range to 70°C provides additional thermal margin.

Both substitute parts are Active status products with current manufacturing support, addressing the obsolescence of the original CS20-7.3728MABJ-UT.

Frequently Asked Questions (FAQ)

Q: Can ABC2-7.3728MHZ-4-T be used as a direct replacement for CS20-7.3728MABJ-UT?

A: Yes. The ABC2-7.3728MHZ-4-T matches all primary electrical parameters (frequency, tolerance, load capacitance) and physical package configuration (4-SMD, No Lead). No circuit redesign or PCB modification is required. The lower ESR of 50 Ohms versus 100 Ohms represents improved performance.

Q: What is the impact of the 2pF load capacitance difference in ECS-73-20-19A-TR?

A: The ECS-73-20-19A-TR specifies 20pF load capacitance versus 18pF for the original part. This 2pF difference may affect oscillation frequency and stability margins. Circuit simulation or prototype testing is necessary to confirm acceptability within your specific application's frequency tolerance budget.

Q: Why does ECS-73-20-19A-TR use a 2-SMD package instead of 4-SMD?

A: The ECS-73-20-19A-TR is packaged as 2-SMD, No Lead, which differs from the original 4-SMD configuration. PCB footprint compatibility must be verified before selection. This package difference may require PCB layout modification.

Q: Are both substitute parts compliant with current regulatory requirements?

A: ABC2-7.3728MHZ-4-T is ROHS3 compliant and REACH Affected. ECS-73-20-19A-TR is ROHS3 compliant and REACH Unaffected. Both parts meet current regulatory standards. Verify compliance requirements specific to your end application and target markets.

Q: What is the inventory status of these substitute parts?

A: ABC2-7.3728MHZ-4-T has 13,044 pieces in stock. ECS-73-20-19A-TR has 20,242 pieces in stock. Both parts are in Active production status with established supply chains.

Q: Can I use ECS-73-20-19A-TR if ABC2-7.3728MHZ-4-T is unavailable?

A: ECS-73-20-19A-TR is a secondary option. The 20pF load capacitance and 2-SMD package require verification of circuit compatibility and PCB footprint fit. Use only after confirming these parameters are acceptable for your application.