CS20-25.000MABJ-UT Crystal Equivalent & Substitute Parts

Part Overview

The CS20-25.000MABJ-UT is a 25 MHz fundamental mode crystal oscillator manufactured by Citizen Finedevice Co Ltd, designed for surface mount applications requiring precise frequency control. This component features 18pF load capacitance, 50 Ohms equivalent series resistance, and operates across the -10°C to 60°C temperature range. The part is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

CS20-25.000MABJ-UT

Citizen Finedevice Co LtdIn Stock: 717CS20-25.000MABJ-UT Datasheet

Current PartRFQ

ABC2-25.000MHZ-4-T

Abracon LLCIn Stock: 2156ABC2-25.000MHZ-4-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CS20-25.000MABJ-UT is determined by the following critical parameters:

• Frequency: 25 MHz (exact match required)
• Frequency Tolerance: ±30ppm (must meet or exceed this specification)
• Load Capacitance: 18pF (exact match required)
• Operating Mode: Fundamental (exact match required)
• Operating Temperature Range: -10°C to 60°C (must encompass or exceed this range)
• Package / Case: 4-SMD, No Lead (exact match required)
• Mounting Type: Surface Mount (exact match required)

The ABC2-25.000MHZ-4-T manufactured by Abracon LLC satisfies all substitution criteria. While the ESR differs (30 Ohms versus 50 Ohms), this represents an improvement in performance characteristics and does not preclude functional equivalence. Physical dimensions remain compatible within acceptable tolerances for PCB layout and assembly processes.

Parameter Comparison

Engineering Selection Recommendations

The ABC2-25.000MHZ-4-T is the qualified substitute for the obsolete CS20-25.000MABJ-UT. Selection of this alternative is supported by the following factors:

• Active product status ensures long-term availability and supply chain continuity
• ROHS3 compliance aligns with current environmental and regulatory requirements
• Improved frequency stability (±30ppm versus ±50ppm) provides enhanced performance margins
• Lower ESR (30 Ohms versus 50 Ohms) reduces power consumption and improves circuit efficiency
• Identical electrical specifications for frequency, load capacitance, and operating temperature range ensure functional compatibility
• Physical dimensions remain within acceptable tolerances for existing PCB layouts

Frequently Asked Questions (FAQ)

Q: Can the ABC2-25.000MHZ-4-T directly replace the CS20-25.000MABJ-UT in existing designs?

A: Yes. Both components share identical frequency (25 MHz), load capacitance (18pF), operating mode (Fundamental), temperature range (-10°C to 60°C), and package configuration (4-SMD, No Lead). The ABC2 variant offers improved specifications with lower ESR and tighter frequency stability.

Q: What is the significance of the ESR difference between the two parts?

A: The CS20-25.000MABJ-UT specifies 50 Ohms ESR, while the ABC2-25.000MHZ-4-T specifies 30 Ohms ESR. Lower ESR reduces power dissipation and improves circuit performance. This difference does not prevent substitution and represents an enhancement.

Q: Are there physical dimension differences that affect PCB layout?

A: Minor dimensional variations exist. The ABC2 is 0.008" (0.20mm) longer in length and 0.008" (0.20mm) shorter in height. These differences are negligible for standard PCB assembly processes and do not require layout modifications.

Q: What compliance certifications should be considered for new designs?

A: The ABC2-25.000MHZ-4-T carries ROHS3 compliance and REACH Affected status, meeting current regulatory requirements for new product development. The obsolete CS20 part should not be specified for new designs.

Q: Is the packaging format identical between the two parts?

A: Both parts use 4-SMD, No Lead surface mount packages. The ABC2 is supplied in Tape & Reel (TR) format, which is standard for production assembly. Packaging format does not affect electrical or mechanical compatibility.