CS20-12.288MABJ-UT Equivalent & Substitute Parts

Part Overview

The CS20-12.288MABJ-UT is a 12.288 MHz crystal oscillator manufactured by Citizen Finedevice Co Ltd, designed for applications requiring precise frequency generation at fundamental operating mode. This component features 18pF load capacitance, 80 Ohms equivalent series resistance, and operates across the -10°C to 60°C temperature range in a 4-SMD, No Lead surface mount package.

The CS20-12.288MABJ-UT is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades where this original part is no longer readily procurable from primary sources.

Substiute Parts

CS20-12.288MABJ-UT

Citizen Finedevice Co LtdIn Stock: 1467CS20-12.288MABJ-UT Datasheet

Current PartRFQ

ABC2-12.288MHZ-4-T

Abracon LLCIn Stock: 821ABC2-12.288MHZ-4-T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CS20-12.288MABJ-UT is determined by the following critical parameters:

Frequency matching at 12.288 MHz is mandatory. Frequency tolerance of ±30ppm or better ensures compatibility with circuit timing requirements. Load capacitance of 18pF is required for proper oscillation characteristics. Operating mode must remain fundamental. Surface mount package type with 4-SMD, No Lead configuration is required for PCB compatibility. Operating temperature range of -10°C to 60°C or wider ensures functional operation across specified environmental conditions.

The ABC2-12.288MHZ-4-T from Abracon LLC meets all substitution criteria. While ESR differs (35 Ohms versus 80 Ohms), this parameter remains within acceptable operating margins for equivalent functionality. Physical dimensions show minor variation (0.465" L x 0.217" W versus 0.457" L x 0.217" W), which is acceptable within standard PCB layout tolerances for 4-SMD packages.

Parameter Comparison

Engineering Selection Recommendations

The ABC2-12.288MHZ-4-T is the qualified substitute for the CS20-12.288MABJ-UT. The substitute part maintains identical frequency, load capacitance, operating mode, temperature range, and package configuration. The ABC2-12.288MHZ-4-T carries Active product status, ensuring ongoing availability and supply chain continuity.

The ABC2-12.288MHZ-4-T demonstrates superior frequency stability at ±30ppm compared to the original part's ±50ppm specification, while maintaining the required ±30ppm frequency tolerance. The lower ESR value of 35 Ohms provides improved performance characteristics. The substitute part is ROHS3 compliant and REACH affected, meeting current regulatory requirements for electronic component manufacturing and distribution.

Physical dimensions show acceptable variation within standard PCB layout tolerances. The substitute part's reduced height of 0.079" (2.00mm) versus 0.087" (2.20mm) presents no compatibility concerns for standard surface mount assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the ABC2-12.288MHZ-4-T directly replace the CS20-12.288MABJ-UT without circuit modifications?

A: Yes. Both parts share identical frequency, load capacitance, operating mode, temperature range, and 4-SMD, No Lead package configuration. The lower ESR of the substitute part (35 Ohms versus 80 Ohms) represents improved performance and requires no circuit redesign.

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

A: ESR affects oscillator startup characteristics and power consumption. The ABC2-12.288MHZ-4-T's lower ESR of 35 Ohms provides faster startup and lower drive power requirements compared to the original 80 Ohms specification. This represents a performance improvement for equivalent functionality.

Q: Are there physical mounting concerns due to dimension variations?

A: No. The dimensional difference of 0.008" (0.20mm) in length falls within standard PCB layout tolerances for 4-SMD packages. The reduced height of the substitute part (0.079" versus 0.087") presents no clearance issues for typical surface mount assembly.

Q: What is the impact of the substitute part's ROHS3 compliance and REACH affected status?

A: ROHS3 compliance indicates the substitute part meets current European Union restrictions on hazardous substances. REACH affected status means the manufacturer maintains compliance with chemical substance regulations. Both certifications reflect current manufacturing standards and regulatory requirements.

Q: Why is the original CS20-12.288MABJ-UT classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The ABC2-12.288MHZ-4-T from Abracon LLC maintains Active status, ensuring continued availability and supply chain support for applications requiring 12.288 MHz crystals with these specifications.