CS20 19.440MABJ-UT Crystal Oscillator Equivalent & Substitute Parts

Part Overview

The CS20 19.440MABJ-UT is a 19.44 MHz crystal oscillator manufactured by Citizen Finedevice Co Ltd, designed for surface mount applications requiring fundamental mode operation. This part is classified as obsolete, making identification of compatible substitute components essential for ongoing production and maintenance applications. The crystal operates at 19.44 MHz with ±30ppm frequency tolerance and 18pF load capacitance in a compact 4-SMD, no-lead package measuring 11.60mm × 5.50mm.

Substiute Parts

CS20 19.440MABJ-UT

Citizen Finedevice Co LtdIn Stock: 735CS20 19.440MABJ-UT Datasheet

Current PartRFQ

ABC2-19.440MHZ-4-T

Abracon LLCIn Stock: 770ABC2-19.440MHZ-4-T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CS20 19.440MABJ-UT is determined by strict equivalence across the following critical parameters:

Frequency matching at 19.44 MHz is mandatory. The substitute part must operate at the identical frequency to maintain circuit timing specifications without requiring oscillator circuit redesign.

Frequency tolerance of ±30ppm must be maintained. Both the main part and substitute demonstrate identical tolerance specifications, ensuring frequency stability requirements are met across the operating temperature range.

Load capacitance of 18pF is a fixed requirement. The substitute part must present the same load capacitance to ensure proper oscillation characteristics and circuit compatibility.

Operating mode (Fundamental) must remain unchanged. The substitute operates in fundamental mode, consistent with the original design.

Package configuration (4-SMD, No Lead) and mounting type (Surface Mount) must be identical to ensure PCB layout compatibility and assembly process alignment.

Operating temperature range (-10°C to 60°C) must be supported by the substitute part.

The ABC2-19.440MHZ-4-T from Abracon LLC meets all these substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

The ABC2-19.440MHZ-4-T is a direct functional substitute for the obsolete CS20 19.440MABJ-UT. Both parts share identical frequency, frequency tolerance, load capacitance, operating mode, temperature range, and package configuration.

The ABC2-19.440MHZ-4-T offers improved ESR performance at 30 Ohms compared to the original 50 Ohms, resulting in lower power dissipation and improved circuit efficiency. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

The ABC2-19.440MHZ-4-T is ROHS3 compliant and REACH affected, meeting current environmental and regulatory requirements. Physical dimensions are compatible, with the substitute measuring 11.80mm length (0.20mm larger) and 2.00mm height (0.20mm smaller), both variations remaining within typical PCB layout tolerances for 4-SMD packages.

Frequently Asked Questions (FAQ)

Q: Can the ABC2-19.440MHZ-4-T directly replace the CS20 19.440MABJ-UT without circuit modifications?

A: Yes. Both parts operate at 19.44 MHz with ±30ppm frequency tolerance, 18pF load capacitance, and fundamental mode operation. The identical frequency and load capacitance specifications ensure the oscillator circuit requires no redesign or tuning adjustments.

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

A: The ABC2-19.440MHZ-4-T has lower ESR (30 Ohms vs. 50 Ohms). Lower ESR reduces power dissipation in the crystal element and improves circuit efficiency. This is a beneficial characteristic that does not compromise compatibility.

Q: Are there physical compatibility concerns with the dimensional differences?

A: The ABC2-19.440MHZ-4-T measures 11.80mm length and 2.00mm height compared to the original 11.60mm length and 2.20mm height. These differences of 0.20mm are within standard PCB layout tolerances for 4-SMD, no-lead packages and do not present assembly or mounting concerns.

Q: What is the product status significance?

A: The CS20 19.440MABJ-UT is obsolete, meaning Citizen Finedevice Co Ltd no longer manufactures this part. The ABC2-19.440MHZ-4-T is in active production, ensuring availability for current and future applications.

Q: Are there regulatory compliance differences?

A: The ABC2-19.440MHZ-4-T is ROHS3 compliant and REACH affected, meeting current environmental regulations. The original part's compliance status is not specified. For applications requiring specific regulatory certifications, the Abracon substitute meets modern environmental standards.

Q: Is the frequency stability specification relevant to substitution?

A: Frequency stability (±50ppm for the original vs. ±30ppm for the substitute) describes long-term drift characteristics. The frequency tolerance specification (±30ppm for both) defines the initial accuracy at room temperature. Both parts meet the ±30ppm tolerance requirement, making them functionally equivalent for this parameter.