CSX325FJC44.000M-UT Equivalent & Substitute Parts

Part Overview

The CSX325FJC44.000M-UT is a 44 MHz XO (Standard) CMOS oscillator manufactured by Citizen Finedevice Co Ltd. This surface mount crystal oscillator operates at 3.3V with standby (power down) functionality and is housed in a 4-SMD, No Lead package. The part is currently obsolete, making identification of functionally equivalent substitutes necessary for ongoing system support and new design implementations.

Substiute Parts

CSX325FJC44.000M-UT

Citizen Finedevice Co LtdIn Stock: 1120CSX325FJC44.000M-UT Datasheet

Current PartRFQ

ASE-44.000MHZ-ET

Abracon LLCIn Stock: 795ASE-44.000MHZ-ET Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CSX325FJC44.000M-UT is determined by the following critical parameters:

• Frequency Match: 44 MHz (exact match required)
• Output Configuration: CMOS output
• Supply Voltage: 3.3V operation
• Frequency Stability: ±100ppm tolerance
• Package Compatibility: 4-SMD, No Lead form factor with matching footprint dimensions (3.20mm x 2.50mm)
• Operating Temperature Range: -20°C ~ 70°C minimum coverage
• Moisture Sensitivity: MSL 1 classification

The ASE-44.000MHZ-ET from Abracon LLC meets all critical electrical and mechanical parameters for direct substitution. While the control function differs (Enable/Disable versus Standby/Power Down), both configurations provide frequency output control capability compatible with the original application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ASE-44.000MHZ-ET is the qualified substitute for the obsolete CSX325FJC44.000M-UT. Selection is based on:

• Electrical Compatibility: Identical frequency, output type, supply voltage, and frequency stability specifications ensure functional equivalence in circuit operation.
• Mechanical Compatibility: Matching package footprint (3.20mm x 2.50mm) and MSL 1 rating enable direct PCB placement without layout modification. The 0.20mm height difference (1.20mm vs 1.00mm) remains within typical assembly clearance tolerances.
• Product Status: The ASE-44.000MHZ-ET is active production, ensuring long-term availability and supply chain continuity.
• Regulatory Compliance: ROHS3 compliance of the Abracon part meets current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the ASE-44.000MHZ-ET replace the CSX325FJC44.000M-UT in existing designs?

A: Yes. Both parts share identical electrical specifications (44 MHz, CMOS output, 3.3V, ±100ppm stability) and mechanical compatibility (4-SMD, No Lead, 3.20mm x 2.50mm footprint). The 0.20mm height difference does not affect PCB assembly or clearance requirements.

Q: What is the difference between Standby (Power Down) and Enable/Disable functions?

A: Both functions provide output control. Standby (Power Down) on the original part and Enable/Disable on the substitute both allow the oscillator output to be controlled by external logic signals. Circuit integration may require verification of control signal polarity and timing requirements specific to the application.

Q: Are there any compliance differences between the two parts?

A: The ASE-44.000MHZ-ET carries ROHS3 compliance certification, while the original part does not specify RoHS status. Both parts are REACH Unaffected and classified as EAR99 for export control purposes.

Q: Is the maximum supply current difference significant?

A: The ASE-44.000MHZ-ET specifies 19mA maximum supply current compared to 7mA for the original part. Power budget impact depends on application duty cycle and control function usage. The disable current specification (10µA) on the Abracon part provides additional power management capability.

Q: Can the parts be used interchangeably on the same PCB assembly?

A: Yes. Identical footprint dimensions and MSL 1 rating enable direct substitution without PCB redesign or assembly process modification.