7M24000049 24 MHz ±20ppm Crystal 18pF SMD Equivalent & Substitute Parts

Part Overview

The 7M24000049 is a 24 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION, designed for surface mount applications in 4-SMD, no-lead package configuration. This active product operates across the industrial temperature range of -20°C to 70°C with ±20ppm frequency stability and 18pF load capacitance specification. The component is RoHS compliant with MSL 1 (unlimited moisture sensitivity level), making it suitable for standard PCB assembly processes without moisture bake-out requirements.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the critical parameters: 24 MHz frequency, ±20ppm stability and tolerance, 18pF load capacitance (where specified), 4-SMD no-lead package, surface mount mounting type, and -20°C to 70°C operating temperature range.

Substiute Parts

7M24000049

TXC CORPORATIONIn Stock: 52147M24000049 Datasheet

Current PartRFQ

7R-24.000MDDJ-T

FTSIn Stock: 22957R-24.000MDDJ-T Datasheet

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ECS-240-18-33-JTM-TR

ECS Inc.In Stock: 3284ECS-240-18-33-JTM-TR Datasheet

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FL2400067

Diodes IncorporatedIn Stock: 985FL2400067 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Mandatory Matching Parameters:

• Frequency: 24 MHz (exact match required)
• Frequency Stability: ±20ppm (substitute must equal or exceed stability)
• Frequency Tolerance: ±20ppm (substitute must equal or exceed tolerance)
• Load Capacitance: 18pF (where specified in main part, substitute must match)
• Package / Case: 4-SMD, No Lead (exact match required for PCB footprint)
• Mounting Type: Surface Mount (exact match required)
• Operating Temperature Range: -20°C to 70°C (substitute must cover or exceed this range)

Mechanical Compatibility Parameters:

• Size / Dimension: 3.20mm L x 2.50mm W (exact match required for PCB layout)
• Height - Seated (Max): Must not exceed 0.80mm for clearance compatibility

Regulatory & Assembly Parameters:

• RoHS Compliance: Required for regulatory alignment
• Moisture Sensitivity Level: MSL 1 (Unlimited) preferred for assembly process compatibility

The three identified substitute parts (7R-24.000MDDJ-T, ECS-240-18-33-JTM-TR, FL2400067) meet all mandatory matching parameters. Variations in ESR (Equivalent Series Resistance) and exact height dimensions are noted but do not disqualify substitution when other critical parameters align.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: ECS-240-18-33-JTM-TR (ECS Inc.)

The ECS-240-18-33-JTM-TR demonstrates the highest parameter alignment with the 7M24000049. Both parts share identical frequency (24 MHz), frequency stability (±20ppm), frequency tolerance (±20ppm), load capacitance (18pF), package configuration (4-SMD, No Lead), physical dimensions (3.20mm x 2.50mm), operating temperature range (-20°C to 70°C), and moisture sensitivity level (MSL 1). The ECS part features ROHS3 compliance and maintains equivalent height specification (0.80mm). ESR specification of 40 Ohms is provided for the ECS part, whereas the main part does not specify ESR. Inventory availability is 3270 units.

Secondary Substitute: FL2400067 (Diodes Incorporated)

The FL2400067 meets all critical electrical and mechanical parameters with 24 MHz frequency, ±20ppm stability and tolerance, 18pF load capacitance, 4-SMD no-lead package, and -20°C to 70°C operating temperature. Physical dimensions match the main part (3.20mm x 2.50mm). Height specification is 0.75mm, which is within acceptable clearance limits. ROHS3 compliance and MSL 1 rating align with regulatory requirements. ESR is specified at 50 Ohms. Inventory availability is 941 units. The SaRonix-eCera™ FL series designation indicates active product line support.

Tertiary Substitute: 7R-24.000MDDJ-T (FTS)

The 7R-24.000MDDJ-T meets electrical specifications with 24 MHz frequency, ±20ppm stability and tolerance, and -20°C to 70°C operating temperature. Package type is 4-SMD, no-lead, and mounting is surface mount. However, physical dimensions differ significantly: 2.05mm L x 1.65mm W versus the main part's 3.20mm x 2.50mm. This dimensional difference requires PCB footprint verification before selection. Load capacitance is not specified for this part. ESR is specified at 150 Ohms. Height is 0.60mm. RoHS compliance and MSL 1 rating are confirmed. Inventory availability is 2215 units. This part is suitable only if PCB layout accommodates the smaller footprint.

Selection Basis:

All three substitute parts maintain active product status and full regulatory compliance (RoHS and MSL 1). Selection should prioritize ECS-240-18-33-JTM-TR or FL2400067 when PCB footprint is designed for 3.20mm x 2.50mm dimensions. The 7R-24.000MDDJ-T is suitable only when the smaller 2.05mm x 1.65mm footprint is compatible with existing PCB layout.

Frequently Asked Questions (FAQ)

Q1: Can the 7R-24.000MDDJ-T be used as a direct replacement for the 7M24000049?

A: The 7R-24.000MDDJ-T meets all electrical specifications (24 MHz, ±20ppm stability and tolerance, -20°C to 70°C operating range, 4-SMD no-lead package). However, the physical dimensions differ: 2.05mm x 1.65mm versus 3.20mm x 2.50mm. Direct replacement is possible only if the PCB footprint and layout accommodate the smaller package size. Verify PCB design before substitution.

Q2: What is the significance of ESR (Equivalent Series Resistance) in crystal selection?

The ESR values provided (40 Ohms for ECS-240-18-33-JTM-TR, 50 Ohms for FL2400067, 150 Ohms for 7R-24.000MDDJ-T) are specified parameters but do not disqualify substitution. ESR affects circuit performance in oscillator design. The main part (7M24000049) does not specify ESR. Verify that the oscillator circuit design accommodates the ESR range of the selected substitute part.

Q3: Are all substitute parts RoHS compliant?

A: Yes. The 7M24000049 is RoHS Compliant. All three substitute parts (7R-24.000MDDJ-T, ECS-240-18-33-JTM-TR, FL2400067) are RoHS Compliant or ROHS3 Compliant, meeting regulatory requirements for lead-free assembly.

Q4: Do all parts have the same moisture sensitivity level?

A: Yes. The main part and all three substitute parts are rated MSL 1 (Unlimited), meaning they do not require moisture bake-out prior to soldering and are compatible with standard PCB assembly processes.

Q5: Which substitute part has the best inventory availability?

A: The ECS-240-18-33-JTM-TR has the highest inventory with 3270 units in stock, followed by 7R-24.000MDDJ-T with 2215 units, and FL2400067 with 941 units. The main part 7M24000049 has 5149 units available.

Q6: Can load capacitance differences affect substitution?

A: The main part specifies 18pF load capacitance. ECS-240-18-33-JTM-TR and FL2400067 both specify 18pF, ensuring direct compatibility. The 7R-24.000MDDJ-T does not specify load capacitance. Verify oscillator circuit design requirements before selecting this part.

Q7: What is the operating temperature range for all parts?

A: All parts operate across -20°C to 70°C, meeting industrial temperature requirements. No temperature range differences exist among the main part and substitute parts.

Q8: Are there any height clearance concerns with substitute parts?

A: The main part specifies maximum seated height of 0.80mm. ECS-240-18-33-JTM-TR matches this specification at 0.80mm. FL2400067 is 0.75mm, providing additional clearance margin. 7R-24.000MDDJ-T is 0.60mm, the lowest profile. All parts fit within standard PCB clearance requirements.

Q9: What packaging format is available for these parts?

A: The main part packaging is not specified. All three substitute parts are supplied in Tape & Reel (TR) format, standard for automated PCB assembly processes.

Q10: How do I verify that a substitute part is compatible with my circuit design?

A: Confirm that the substitute part matches the main part in: frequency (24 MHz), frequency stability (±20ppm), frequency tolerance (±20ppm), load capacitance (18pF where specified), package type (4-SMD, no-lead), physical dimensions (verify PCB footprint), and operating temperature range (-20°C to 70°C). Consult the oscillator circuit schematic and PCB layout documentation to ensure compatibility.