CS325-16.384MABJ-UT Equivalent & Substitute Parts

Part Overview

The CS325-16.384MABJ-UT is a 16.384 MHz crystal oscillator manufactured by Citizen Finedevice Co Ltd, designed for applications requiring precise frequency generation at this standard frequency. This part operates in fundamental mode with an 18pF load capacitance and is housed in a 4-SMD, No Lead surface mount package measuring 3.20mm x 2.50mm. The product is currently obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Frequency	16.384 MHz
Frequency Tolerance	±30ppm
Load Capacitance	18pF
ESR (Equivalent Series Resistance)	120 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-10°C ~ 60°C
Package / Case	4-SMD, No Lead
Size / Dimension	3.20mm x 2.50mm
Height - Seated (Max)	0.60mm
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the CS325-16.384MABJ-UT is determined by strict alignment of electrical and mechanical parameters. The following criteria establish compatibility:

Critical Parameters for Substitution:

Frequency: Must be 16.384 MHz
Load Capacitance: Must be 18pF
Operating Mode: Must be Fundamental
Package / Case: Must be 4-SMD, No Lead
Physical Dimensions: Must be 3.20mm x 2.50mm

Allowable Variations:

Frequency Tolerance: May be equal to or tighter than ±30ppm
ESR: May be lower than 120 Ohms
Operating Temperature Range: May be equal to or wider than -10°C ~ 60°C
Height: May be equal to or lower than 0.60mm

The ABM8-16.384MHZ-B2-T meets all critical parameters and allowable variations, qualifying it as a direct substitute.

Parameter Comparison

Parameter	CS325-16.384MABJ-UT	ABM8-16.384MHZ-B2-T	Compatibility
Manufacturer	Citizen Finedevice Co Ltd	Abracon LLC	Different manufacturer
Frequency	16.384 MHz	16.384 MHz	Match
Frequency Tolerance	±30ppm	±20ppm	Substitute is tighter
Load Capacitance	18pF	18pF	Match
ESR (Equivalent Series Resistance)	120 Ohms	70 Ohms	Substitute is lower
Operating Mode	Fundamental	Fundamental	Match
Operating Temperature Range	-10°C ~ 60°C	-20°C ~ 70°C	Substitute is wider
Package / Case	4-SMD, No Lead	4-SMD, No Lead	Match
Size / Dimension	3.20mm x 2.50mm	3.20mm x 2.50mm	Match
Height - Seated (Max)	0.60mm	0.80mm	Substitute is higher
Mounting Type	Surface Mount	Surface Mount	Match
Product Status	Obsolete	Active	Substitute is active

Engineering Selection Recommendations

The ABM8-16.384MHZ-B2-T from Abracon LLC is a qualified substitute for the obsolete CS325-16.384MABJ-UT. Selection is supported by the following factors:

Electrical Compatibility: Both parts operate at 16.384 MHz with 18pF load capacitance in fundamental mode. The ABM8 provides a tighter frequency tolerance (±20ppm versus ±30ppm) and lower ESR (70 Ohms versus 120 Ohms), both favorable characteristics for circuit performance.

Mechanical Compatibility: Physical dimensions and package type are identical (3.20mm x 2.50mm, 4-SMD No Lead). The ABM8 height of 0.80mm exceeds the CS325 maximum of 0.60mm by 0.20mm; PCB layout clearance must be verified for applications with height constraints.

Product Status & Compliance: The ABM8-16.384MHZ-B2-T is active production status with RoHS3 compliance, ensuring long-term availability and regulatory alignment. Both parts carry REACH Unaffected and EAR99 classifications.

Packaging Consideration: The CS325 is supplied in Cut Tape (CT) & Digi-Reel packaging, while the ABM8 is supplied in Tape & Reel (TR) format. Procurement and handling procedures may differ accordingly.

Frequently Asked Questions (FAQ)

Q: Can the ABM8-16.384MHZ-B2-T be used as a direct replacement for the CS325-16.384MABJ-UT?

A: Yes, the ABM8-16.384MHZ-B2-T qualifies as a direct substitute. Both parts share identical frequency, load capacitance, operating mode, package type, and physical dimensions. The ABM8 offers improved electrical performance with tighter frequency tolerance and lower ESR.

Q: What is the significance of the height difference between these parts?

A: The ABM8 has a maximum seated height of 0.80mm compared to the CS325 at 0.60mm. This 0.20mm difference must be evaluated against PCB layout constraints, particularly in applications with limited vertical clearance or specific component stacking requirements.

Q: Are there any compliance or regulatory differences between these parts?

A: Both parts are REACH Unaffected and classified as EAR99. The ABM8 carries RoHS3 compliance certification, while the CS325 status is not specified in available data. For applications requiring RoHS compliance, the ABM8 is the appropriate selection.

Q: How do the ESR values affect circuit performance?

A: ESR (Equivalent Series Resistance) influences crystal oscillator circuit stability and startup characteristics. The ABM8 at 70 Ohms provides lower resistance than the CS325 at 120 Ohms, generally resulting in improved circuit performance and faster oscillation startup.

Q: What packaging format differences exist between these parts?

A: The CS325 is supplied in Cut Tape (CT) & Digi-Reel format, while the ABM8 uses standard Tape & Reel (TR) packaging. Procurement quantities, handling procedures, and storage requirements may differ between these formats.

Q: Is the tighter frequency tolerance of the ABM8 beneficial?

A: The ABM8 frequency tolerance of ±20ppm is tighter than the CS325 specification of ±30ppm. This provides improved frequency accuracy, which is advantageous for applications requiring precise timing or frequency stability.

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