CS10-12.288MABJ-UT Equivalent & Substitute Parts

Part Overview

The CS10-12.288MABJ-UT is a 12.288 MHz crystal oscillator manufactured by Citizen Finedevice Co Ltd, designed for fundamental mode operation in 2-SMD, No Lead surface mount packages. This part is classified as obsolete, making identification of equivalent and substitute components essential for ongoing production and maintenance applications. The 12.288 MHz frequency with 18pF load capacitance and 70 Ohms ESR serves specific timing requirements in telecommunications and audio processing systems.

Key Parameters

Parameter	Value
Frequency	12.288 MHz
Frequency Tolerance	±30ppm
Load Capacitance	18pF
ESR (Equivalent Series Resistance)	70 Ohms
Operating Mode	Fundamental
Package / Case	2-SMD, No Lead
Size / Dimension	6.00mm x 4.60mm
Operating Temperature Range	-10°C ~ 60°C
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the CS10-12.288MABJ-UT is determined by the following critical parameters:

Frequency match: 12.288 MHz (exact)
Load capacitance: 18pF (exact)
Package type: 2-SMD, No Lead (exact)
Physical dimensions: 6.00mm x 4.60mm (exact)
Operating mode: Fundamental (exact)

Frequency tolerance, frequency stability, ESR, and operating temperature range are secondary parameters that may vary within acceptable limits for circuit compatibility. The substitute parts listed below meet all primary substitution criteria.

Parameter Comparison

Parameter	CS10-12.288MABJ-UT (Citizen)	ABM7-12.288MHZ-D2Y-T (Abracon)	ECS-122.8-18-23A-EN-TR (ECS Inc.)
Frequency	12.288 MHz	12.288 MHz	12.288 MHz
Frequency Tolerance	±30ppm	±20ppm	±30ppm
Frequency Stability	±50ppm	±30ppm	±50ppm
Load Capacitance	18pF	18pF	18pF
ESR	70 Ohms	60 Ohms	80 Ohms
Operating Mode	Fundamental	Fundamental	Fundamental
Package / Case	2-SMD, No Lead	2-SMD, No Lead	2-SMD, No Lead
Size / Dimension	6.00mm x 4.60mm	6.00mm x 4.60mm	6.00mm x 4.60mm
Height - Seated (Max)	1.00mm	1.40mm	1.10mm
Operating Temperature	-10°C ~ 60°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Affected	REACH Unaffected

Engineering Selection Recommendations

Both substitute parts meet the core electrical and mechanical requirements for direct replacement of the CS10-12.288MABJ-UT.

The ABM7-12.288MHZ-D2Y-T (Abracon LLC) offers improved frequency tolerance (±20ppm versus ±30ppm) and lower ESR (60 Ohms versus 70 Ohms), with extended operating temperature range (-40°C ~ 85°C). This part is ROHS3 compliant and currently in active production status with high inventory availability (17,590 pcs). The increased seated height (1.40mm) should be verified against PCB layout constraints.

The ECS-122.8-18-23A-EN-TR (ECS Inc.) maintains identical frequency tolerance and stability specifications to the original part (±30ppm and ±50ppm respectively), with slightly higher ESR (80 Ohms). This part is ROHS3 compliant, REACH unaffected, and in active production with substantial inventory (5,530 pcs). The seated height (1.10mm) is closer to the original specification.

Both substitute parts carry ECCN EAR99 and HTSUS 8541.60.0050 classifications matching the original part.

Frequently Asked Questions (FAQ)

Q: Can the ABM7-12.288MHZ-D2Y-T be used as a direct replacement for the CS10-12.288MABJ-UT?

A: Yes. Both parts share identical frequency (12.288 MHz), load capacitance (18pF), package type (2-SMD, No Lead), and physical dimensions (6.00mm x 4.60mm). The ABM7 variant offers tighter frequency tolerance and lower ESR, making it functionally compatible for the same circuit applications.

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

A: ESR (Equivalent Series Resistance) affects crystal oscillator startup time and power consumption. The original part specifies 70 Ohms, while substitutes range from 60 to 80 Ohms. These variations remain within acceptable operating margins for standard crystal oscillator circuits and do not require circuit redesign.

Q: Does the seated height difference impact PCB assembly?

A: The original part has a maximum seated height of 1.00mm. The ABM7 substitute reaches 1.40mm, while the ECS substitute reaches 1.10mm. Verify clearance against PCB layout, component placement, and enclosure constraints before selection.

Q: Are there compliance differences between the substitute parts?

A: The ABM7-12.288MHZ-D2Y-T is ROHS3 compliant and REACH affected. The ECS-122.8-18-23A-EN-TR is ROHS3 compliant and REACH unaffected. Both meet EAR99 export classification. Verify compliance requirements for your specific application and region.

Q: Which substitute part should be selected for new designs?

A: Both parts are in active production. The ABM7 offers superior frequency stability and lower ESR for demanding timing applications. The ECS maintains closer alignment to original specifications. Selection depends on application requirements, inventory availability, and compliance obligations.

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