CS20-24.000MABJ-UT Equivalent & Substitute Parts

Part Overview

The CS20-24.000MABJ-UT is a 24 MHz crystal oscillator manufactured by Citizen Finedevice Co Ltd, designed for fundamental mode operation in surface mount applications. This part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity. The crystal operates at 24.000 MHz with ±30ppm frequency tolerance and 18pF load capacitance in a 4-SMD, no-lead package.

Substiute Parts

CS20-24.000MABJ-UT

Citizen Finedevice Co LtdIn Stock: 991CS20-24.000MABJ-UT Datasheet

Current PartRFQ

ECS-240-20-18-TR

ECS Inc.In Stock: 1155ECS-240-20-18-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS20-24.000MABJ-UT is determined by the following critical parameters:

• Frequency Match: 24 MHz (exact match required)
• Frequency Tolerance: ±30ppm (must meet or exceed this specification)
• ESR: 50 Ohms (must match for circuit stability)
• Operating Mode: Fundamental (required for application compatibility)
• Package / Case: 4-SMD, No Lead (physical and electrical compatibility)
• Load Capacitance: 18pF nominal (circuit design parameter)

The ECS-240-20-18-TR meets these substitution criteria with the following considerations: it maintains the same frequency, tolerance, ESR, operating mode, and package configuration. The load capacitance differs at 20pF versus 18pF, representing a 2pF variance within typical circuit tolerance margins for 24 MHz crystal applications.

Parameter Comparison

Engineering Selection Recommendations

The ECS-240-20-18-TR serves as a direct functional substitute for the obsolete CS20-24.000MABJ-UT. Selection of this alternative is supported by:

• Product Status: The substitute is active and in production, ensuring long-term availability and supply chain continuity.
• Compliance Alignment: Both parts maintain identical REACH and ECCN classifications, preserving regulatory compliance across applications.
• Electrical Equivalence: Frequency, tolerance, ESR, and operating mode specifications are identical, ensuring circuit performance parity.
• Physical Compatibility: Both parts use 4-SMD, no-lead packaging with compatible footprints. Dimensional variance (0.008" length difference, 0.011" height difference) remains within standard PCB assembly tolerances.
• Environmental Capability: The substitute provides an extended operating temperature range (-40°C ~ 85°C versus -10°C ~ 60°C), offering broader application flexibility.

The 2pF load capacitance difference (20pF versus 18pF) is a secondary consideration in 24 MHz crystal circuit design and does not preclude substitution when circuit design parameters accommodate this variance.

Frequently Asked Questions (FAQ)

Q: Can the ECS-240-20-18-TR replace the CS20-24.000MABJ-UT in existing designs without modification?

A: Yes, for most applications. Both parts operate at 24 MHz with ±30ppm tolerance and 50 Ohm ESR in identical 4-SMD, no-lead packages. The 2pF load capacitance difference is typically accommodated within standard crystal circuit design margins. Verify circuit design parameters if load capacitance is a critical specification.

Q: What is the significance of the frequency stability difference (±50ppm versus ±100ppm)?

A: Frequency stability describes long-term drift over the operating temperature range. The main part specifies ±50ppm stability; the substitute specifies ±100ppm. For applications requiring tighter long-term frequency control, this difference may be relevant. Both parts meet the ±30ppm frequency tolerance specification at nominal conditions.

Q: Are there physical footprint compatibility concerns?

A: Both parts use 4-SMD, no-lead packages with compatible footprints. The substitute is 0.008" longer and 0.011" taller. These dimensional differences fall within standard PCB assembly tolerances and do not typically require layout modifications.

Q: Why is the substitute part classified as active while the main part is obsolete?

A: The CS20-24.000MABJ-UT has been discontinued by Citizen Finedevice Co Ltd. The ECS-240-20-18-TR remains in active production by ECS Inc., providing procurement continuity and long-term availability for 24 MHz crystal applications.

Q: Does the extended operating temperature range of the substitute affect compatibility?

A: No. The substitute's extended range (-40°C ~ 85°C) is a superset of the main part's range (-10°C ~ 60°C). Applications operating within the original temperature range experience no adverse effects from this specification difference.