7M-25.000MEEV-T MHz Crystal Equivalent & Substitute Parts

Part Overview

The 7M-25.000MEEV-T is a 25 MHz fundamental mode quartz crystal manufactured by TXC CORPORATION. This surface mount crystal is designed for applications requiring precise frequency generation with tight stability specifications. The part is currently in active production status with 707 units available in inventory.

Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across manufacturers, enabling procurement flexibility and supply chain continuity without circuit redesign.

Key Parameters

Parameter	Value	Unit
Frequency	25	MHz
Frequency Stability	±10	ppm
Load Capacitance	8	pF
ESR (Equivalent Series Resistance)	50	Ohms
Operating Mode	Fundamental	—
Package Type	4-SMD, No Lead	—
Physical Size	3.20 x 2.50 x 0.80	mm
Operating Temperature Range	-20 to +70	°C
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the 7M-25.000MEEV-T is determined by strict equivalence across the following critical parameters:

Frequency: 25 MHz (exact match required)
Frequency Stability: ±10 ppm (exact match required)
Load Capacitance: 8 pF (exact match required)
ESR: 50 Ohms (exact match required)
Operating Mode: Fundamental (exact match required)
Package Configuration: 4-SMD, No Lead (exact match required)
Physical Dimensions: 3.20 x 2.50 x 0.80 mm (exact match required)
Operating Temperature Range: -20°C to +70°C (exact match required)

Parts meeting all these criteria are classified as parametric equivalents and may be substituted in circuit applications without modification to PCB layout or component footprint.

Parameter Comparison

Parameter	7M-25.000MEEV-T (TXC)	QT325S-25.000MEEV-T (QST)	Match Status
Manufacturer	TXC CORPORATION	QST	Different
Series	7M	QT325S	Different
Frequency	25 MHz	25 MHz	Equivalent
Frequency Stability	±10 ppm	±10 ppm	Equivalent
Frequency Tolerance	±10 ppm	±10 ppm	Equivalent
Load Capacitance	8 pF	8 pF	Equivalent
ESR	50 Ohms	50 Ohms	Equivalent
Operating Mode	Fundamental	Fundamental	Equivalent
Package / Case	4-SMD, No Lead	4-SMD, No Lead	Equivalent
Size / Dimension	3.20 x 2.50 x 0.80 mm	3.20 x 2.50 x 0.80 mm	Equivalent
Operating Temperature	-20°C to +70°C	-20°C to +70°C	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Packaging	Tape & Reel (TR)	Tape & Reel (TR)	Equivalent
Product Status	Active	Active	Equivalent
ECCN	EAR99	EAR99	Equivalent
HTSUS	8541.60.0060	8541.60.0060	Equivalent

Engineering Selection Recommendations

Both the 7M-25.000MEEV-T and QT325S-25.000MEEV-T are active production parts with equivalent electrical and mechanical specifications. Selection between these parts is based on the following factors:

Inventory Availability: The QT325S-25.000MEEV-T (QST) has 759 units in stock compared to 707 units for the 7M-25.000MEEV-T (TXC).

Compliance Status: The QT325S-25.000MEEV-T carries RoHS3 compliance certification and MSL Level 1 (Unlimited) moisture sensitivity rating, providing additional compliance documentation for regulated applications.

Regulatory Classification: Both parts are classified under ECCN EAR99 and HTSUS 8541.60.0060, indicating equivalent export and tariff treatment.

Mechanical Compatibility: Identical package footprint (4-SMD, No Lead), physical dimensions (3.20 x 2.50 x 0.80 mm), and mounting type ensure direct PCB compatibility without layout modification.

Frequently Asked Questions (FAQ)

Q: Can the QT325S-25.000MEEV-T replace the 7M-25.000MEEV-T without PCB redesign?

A: Yes. Both parts share identical package type (4-SMD, No Lead), physical dimensions (3.20 x 2.50 x 0.80 mm), and mounting specifications. No PCB layout modification is required.

Q: Are the electrical characteristics identical between these two parts?

A: Yes. Both parts operate at 25 MHz with ±10 ppm frequency stability, 8 pF load capacitance, and 50 Ohms ESR. Operating temperature range (-20°C to +70°C) and operating mode (Fundamental) are identical.

Q: What is the difference between these two crystal models?

A: The parts differ only in manufacturer (TXC CORPORATION versus QST) and internal series designation (7M versus QT325S). All electrical parameters, mechanical specifications, and performance characteristics are equivalent.

Q: Does the QT325S-25.000MEEV-T have additional certifications?

A: The QT325S-25.000MEEV-T carries RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating. Both parts share EAR99 export classification and HTSUS 8541.60.0060 tariff code.

Q: Which part should be selected for new designs?

A: Selection is based on procurement requirements, inventory availability, and compliance documentation needs. Both parts are functionally and mechanically equivalent for circuit applications.

Q: Are there any temperature or frequency stability differences?

A: No. Both parts operate across the identical temperature range (-20°C to +70°C) and maintain ±10 ppm frequency stability across this range.

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