7M-24.000MBBK-T Equivalent & Substitute Parts

Part Overview

The 7M-24.000MBBK-T is a 24 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION. This surface mount device operates at 24.0000 MHz with ±50ppm frequency stability and 20pF load capacitance. The component is actively produced and widely used in timing applications requiring precise frequency reference. Substitute parts are identified when equivalent electrical and mechanical parameters are available from alternative manufacturers, enabling supply chain flexibility and inventory optimization.

Key Parameters

Parameter	Value	Significance for Substitution
Frequency	24 MHz	Core functional requirement; must match exactly
Frequency Stability	±50ppm	Determines timing accuracy; must match or exceed
Load Capacitance	20pF	Circuit design parameter; must match exactly
ESR (Equivalent Series Resistance)	60 Ohms	Affects oscillator startup and power consumption; critical for circuit compatibility
Operating Mode	Fundamental	Determines frequency generation method; must match
Package / Case	4-SMD, No Lead	Physical footprint and mounting compatibility; must match
Size / Dimension	3.20mm x 2.50mm	PCB layout constraint; must match for direct replacement
Operating Temperature Range	-20°C ~ 70°C	Application environment compatibility; must match or exceed
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Storage and handling requirements; lower MSL preferred
RoHS Status	RoHS Compliant	Regulatory compliance requirement

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following critical parameters:

Mandatory Match Requirements:

Frequency: 24 MHz (exact)
Frequency Stability: ±50ppm (exact)
Load Capacitance: 20pF (exact)
Operating Mode: Fundamental (exact)
Package / Case: 4-SMD, No Lead (exact)
Operating Temperature Range: -20°C ~ 70°C (minimum)

Allowable Variation Parameters:

ESR (Equivalent Series Resistance): Variation permitted within circuit design tolerances
Physical Dimensions: Minor variations acceptable if package footprint remains compatible with 4-SMD, No Lead specification
Manufacturer: Different manufacturers permitted if all electrical and mechanical parameters align

Compliance Considerations:

RoHS Status: All substitute parts must maintain RoHS compliance
MSL Rating: Substitute parts must meet or exceed MSL 1 rating
REACH Status: All parts must maintain REACH Unaffected status

The identified substitute parts (ECS-240-20-33-TR and FW2400001) satisfy all mandatory match requirements and compliance criteria, enabling direct functional substitution in applications where the 7M-24.000MBBK-T is specified.

Parameter Comparison

Parameter	7M-24.000MBBK-T (TXC)	ECS-240-20-33-TR (ECS Inc.)	FW2400001 (Diodes Inc.)
Manufacturer	TXC CORPORATION	ECS Inc.	Diodes Incorporated
Series	7M	ECX-32	SaRonix-eCera™ FW
Frequency	24 MHz	24 MHz	24 MHz
Frequency Stability	±50ppm	±50ppm	±50ppm
Frequency Tolerance	±50ppm	±50ppm	±50ppm
Load Capacitance	20pF	20pF	20pF
ESR	60 Ohms	40 Ohms	70 Ohms
Operating Mode	Fundamental	Fundamental	Fundamental
Operating Temperature	-20°C ~ 70°C	-20°C ~ 70°C	-20°C ~ 70°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead
Size / Dimension	3.20mm x 2.50mm	3.20mm x 2.50mm	2.00mm x 1.60mm
Height - Seated (Max)	0.80mm	0.80mm	0.55mm
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Active	Active	Active

Engineering Selection Recommendations

ECS-240-20-33-TR (ECS Inc.):

This substitute part matches all mandatory electrical parameters with the 7M-24.000MBBK-T. The ESR specification of 40 Ohms is lower than the original 60 Ohms, resulting in reduced power consumption and improved oscillator startup characteristics. Physical dimensions remain identical at 3.20mm x 2.50mm, enabling direct PCB footprint compatibility. The part maintains ROHS3 compliance and MSL 1 rating. Inventory availability is significantly higher (11,591 pcs) compared to the original part (873 pcs), supporting supply chain continuity.

FW2400001 (Diodes Incorporated):

This substitute part satisfies all mandatory electrical parameters. The ESR specification of 70 Ohms is higher than the original 60 Ohms, requiring circuit verification to confirm acceptable oscillator performance within the application's design margins. Physical dimensions differ at 2.00mm x 1.60mm with reduced height of 0.55mm, necessitating PCB layout modification and revalidation. The part maintains ROHS3 compliance and MSL 1 rating. Inventory availability is moderate (2,620 pcs). This substitute is suitable only when PCB redesign is feasible or when the smaller form factor provides design advantage.

Frequently Asked Questions (FAQ)

Q: Can ECS-240-20-33-TR be used as a direct replacement for 7M-24.000MBBK-T without circuit modification?

A: Yes. The ECS-240-20-33-TR matches all mandatory electrical and mechanical parameters. The lower ESR (40 Ohms vs. 60 Ohms) improves oscillator performance. No circuit modification is required for direct substitution.

Q: What is the impact of ESR variation between the main part and substitute parts?

A: ESR affects oscillator startup time and power consumption. The ECS-240-20-33-TR (40 Ohms) provides improved startup characteristics. The FW2400001 (70 Ohms) requires circuit verification to confirm acceptable performance within design margins. Consult oscillator IC datasheets for ESR tolerance specifications.

Q: Can FW2400001 be used as a direct replacement without PCB modification?

A: No. The FW2400001 has different physical dimensions (2.00mm x 1.60mm vs. 3.20mm x 2.50mm). PCB layout modification is required. The reduced height (0.55mm vs. 0.80mm) may provide design advantage in space-constrained applications.

Q: Are all substitute parts RoHS compliant?

A: Yes. Both substitute parts (ECS-240-20-33-TR and FW2400001) maintain ROHS3 compliance, meeting current regulatory requirements.

Q: What is the significance of MSL 1 rating for all parts?

A: MSL 1 (Unlimited) indicates the lowest moisture sensitivity level. These parts have unlimited shelf life under normal storage conditions and require no special moisture control during handling or storage.

Q: Do substitute parts maintain the same frequency stability specification?

A: Yes. All substitute parts maintain ±50ppm frequency stability, identical to the 7M-24.000MBBK-T. Frequency tolerance and load capacitance specifications are also identical across all parts.

Q: Which substitute part offers the best supply chain availability?

A: ECS-240-20-33-TR provides the highest inventory availability at 11,591 pcs, compared to 873 pcs for the original part and 2,620 pcs for FW2400001.

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