FA-365 24.0000MB-C Equivalent & Substitute Parts

Part Overview

The FA-365 24.0000MB-C is a 24 MHz crystal oscillator manufactured by EPSON, designed for surface mount applications requiring fundamental mode operation. This component is classified as obsolete, necessitating identification of active substitute parts that maintain electrical and mechanical compatibility. The part operates across a temperature range of -20°C to 70°C with a load capacitance of 18pF and 50 Ohms equivalent series resistance.

Key Parameters

Parameter	Value
Frequency	24 MHz
Frequency Stability	±30ppm
Frequency Tolerance	±50ppm
Load Capacitance	18pF
ESR (Equivalent Series Resistance)	50 Ohms
Operating Mode	Fundamental
Operating Temperature Range	-20°C ~ 70°C
Mounting Type	Surface Mount
Package / Case	2-SMD, No Lead
Size / Dimension	0.236" L x 0.138" W (6.00mm x 4.60mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the FA-365 24.0000MB-C is determined by the following critical parameters:

Mandatory Matching Parameters:

Frequency: 24 MHz
Load Capacitance: 18pF
Operating Mode: Fundamental
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Compatible Variation Parameters:

Frequency Stability: Must be equal to or better (lower absolute value) than ±30ppm
Frequency Tolerance: Must be equal to or better (lower absolute value) than ±50ppm
ESR: Must be equal to or lower than 50 Ohms
Operating Temperature Range: May extend beyond -20°C ~ 70°C
Package / Case: 2-SMD or 4-SMD configurations acceptable
Physical Dimensions: Minor variations within 6.00mm x 4.60mm footprint tolerance acceptable
MSL: Level 1 or equivalent

Parameter Comparison

Parameter	FA-365 24.0000MB-C (EPSON)	ABMM2-24.000MHZ-E2-T (Abracon LLC)	ECS-240-18-23A-EN-TR (ECS Inc.)
Frequency	24 MHz	24 MHz	24 MHz
Frequency Stability	±30ppm	±20ppm	±50ppm
Frequency Tolerance	±50ppm	±20ppm	±30ppm
Load Capacitance	18pF	18pF	18pF
ESR (Equivalent Series Resistance)	50 Ohms	50 Ohms	30 Ohms
Operating Mode	Fundamental	Fundamental	Fundamental
Operating Temperature Range	-20°C ~ 70°C	-20°C ~ 70°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-SMD, No Lead	4-SMD, No Lead	2-SMD, No Lead
Size / Dimension	0.236" L x 0.138" W (6.00mm x 4.60mm)	0.240" L x 0.142" W (6.00mm x 3.60mm)	0.236" L x 0.138" W (6.00mm x 4.60mm)
Height - Seated (Max)	0.055" (1.40mm)	0.047" (1.20mm)	0.043" (1.10mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Not Applicable	1 (Unlimited)
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

ABMM2-24.000MHZ-E2-T (Abracon LLC): This substitute demonstrates superior frequency stability at ±20ppm and frequency tolerance at ±20ppm, both better than the original specification. The part maintains identical load capacitance and ESR characteristics. The 4-SMD package configuration differs from the original 2-SMD, requiring PCB layout verification. Product status is active with full ROHS3 compliance. Inventory availability is substantial at 8,150 pieces.

ECS-240-18-23A-EN-TR (ECS Inc.): This substitute maintains identical frequency, load capacitance, and 2-SMD package configuration as the original part. ESR is improved at 30 Ohms compared to 50 Ohms. Operating temperature range extends to -40°C ~ 85°C, providing broader environmental coverage. Frequency tolerance at ±30ppm is superior to the original ±50ppm specification. Product status is active with full ROHS3 compliance and extended inventory availability at 31,133 pieces.

Frequently Asked Questions (FAQ)

Q: Can the ABMM2-24.000MHZ-E2-T substitute the FA-365 24.0000MB-C directly on the PCB?

A: The ABMM2-24.000MHZ-E2-T maintains the same frequency, load capacitance, and ESR. However, the package configuration differs from 2-SMD to 4-SMD, and physical dimensions vary slightly (0.240" L x 0.142" W versus 0.236" L x 0.138" W). PCB footprint compatibility must be verified before implementation.

Q: What is the primary advantage of the ECS-240-18-23A-EN-TR substitute?

A: The ECS-240-18-23A-EN-TR maintains the identical 2-SMD package and physical dimensions as the original FA-365 24.0000MB-C, enabling direct PCB compatibility. Additionally, ESR is reduced to 30 Ohms, and the operating temperature range extends to -40°C ~ 85°C.

Q: Are both substitute parts ROHS3 compliant?

A: Yes, both ABMM2-24.000MHZ-E2-T and ECS-240-18-23A-EN-TR are ROHS3 compliant, matching the original FA-365 24.0000MB-C specification.

Q: What is the significance of frequency stability and frequency tolerance differences?

A: Frequency stability (±ppm) indicates the oscillator's ability to maintain its nominal frequency under specified operating conditions. Frequency tolerance (±ppm) defines the initial accuracy at calibration. Both substitute parts offer equal or superior specifications compared to the original part.

Q: Does the MSL rating affect substitution compatibility?

A: The original FA-365 24.0000MB-C specifies MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The ABMM2-24.000MHZ-E2-T lists MSL as Not Applicable, which is compatible with unlimited moisture exposure applications. The ECS-240-18-23A-EN-TR maintains MSL 1 (Unlimited), directly matching the original specification.

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