7M-40.000MEEV-T 40 MHz Crystal Equivalent & Substitute Parts

Part Overview

The 7M-40.000MEEV-T is a 40 MHz fundamental mode crystal manufactured by TXC CORPORATION in the 7M series. This surface mount device operates at 40.0000 MHz with ±10ppm frequency stability and is housed in a 4-SMD, No Lead package measuring 3.20mm x 2.50mm. The part is RoHS Compliant, MSL 1 rated, and currently Active in production status with 988 pieces in stock.

Substitute parts are necessary when the primary part becomes unavailable, when alternative electrical characteristics better suit specific circuit requirements, or when different package dimensions are required for board layout optimization.

Key Parameters

Parameter	Value	Unit
Frequency	40.0000	MHz
Frequency Stability	±10	ppm
Load Capacitance	8	pF
ESR (Equivalent Series Resistance)	60	Ohms
Operating Mode	Fundamental	—
Operating Temperature Range	-20 to 70	°C
Mounting Type	Surface Mount	—
Package / Case	4-SMD, No Lead	—
Size / Dimension	3.20 x 2.50	mm
Height - Seated (Max)	0.80	mm
RoHS Status	RoHS Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 7M-40.000MEEV-T is determined by the following critical parameters:

Mandatory Matching Parameters:

Frequency: 40.0000 MHz (exact match required)
Frequency Stability: ±10ppm (exact match required)
Operating Mode: Fundamental (exact match required)
Operating Temperature Range: -20°C to 70°C (minimum coverage required)
Mounting Type: Surface Mount (exact match required)
Package / Case: 4-SMD, No Lead (exact match required)

Flexible Parameters (Allow Variation):

Load Capacitance: 6pF to 10pF (circuit design dependent)
ESR: 40 Ohms to 60 Ohms (circuit design dependent)
Physical Dimensions: Variations permitted if footprint compatibility maintained
Height: Variations permitted if board clearance available

Substitute parts are grouped into two categories: Direct Electrical Equivalents (matching load capacitance and ESR) and Compatible Alternatives (different load capacitance or ESR within acceptable design ranges).

Parameter Comparison

Part Number	Manufacturer	Frequency (MHz)	Frequency Stability (ppm)	Load Capacitance (pF)	ESR (Ohms)	Package	Size (mm)	Height Max (mm)	RoHS Status	Inventory (Pcs)
7M-40.000MEEV-T	TXC CORPORATION	40.0000	±10	8	60	4-SMD, No Lead	3.20 x 2.50	0.80	RoHS Compliant	988
7M-40.000MEEQ-T	TXC CORPORATION	40.0000	±10	10	60	4-SMD, No Lead	3.20 x 2.50	0.80	RoHS Compliant	1349
403C11A40M00000	CTS-Frequency Controls	40.0000	±10	10	60	4-SMD, No Lead	3.20 x 2.50	0.80	ROHS3 Compliant	16957
ABM10W-40.0000MHZ-7-B1U-T3	Abracon LLC	40.0000	±10	7	40	4-SMD, No Lead	2.50 x 2.00	0.60	ROHS3 Compliant	3109
ABM10W-40.0000MHZ-8-B1U-T3	Abracon LLC	40.0000	±10	8	40	4-SMD, No Lead	2.50 x 2.00	0.60	ROHS3 Compliant	4899
ABM11-40.000MHZ-B1U-T3	Abracon LLC	40.0000	±10	10	60	4-SMD, No Lead	2.00 x 1.60	0.59	ROHS3 Compliant	16251
ABM11W-40.0000MHZ-6-B1U-T3	Abracon LLC	40.0000	±10	6	40	4-SMD, No Lead	2.00 x 1.60	0.50	ROHS3 Compliant	8794
ABM11W-40.0000MHZ-7-B1U-T3	Abracon LLC	40.0000	±10	7	40	4-SMD, No Lead	2.00 x 1.60	0.50	ROHS3 Compliant	3794
ABM11W-40.0000MHZ-8-B1U-T3	Abracon LLC	40.0000	±10	8	40	4-SMD, No Lead	2.00 x 1.60	0.50	ROHS3 Compliant	2133
ECS-400-10-33B-CKM-TR	ECS Inc.	40.0000	±10	10	40	4-SMD, No Lead	3.20 x 2.50	0.80	ROHS3 Compliant	1328
ECS-400-10-37-CKM-TR	ECS Inc.	40.0000	±10	10	50	4-SMD, No Lead	2.00 x 1.60	0.55	ROHS3 Compliant	35571

Engineering Selection Recommendations

Category 1: Direct Electrical Equivalents (Same Load Capacitance and ESR)

The 7M-40.000MEEV-T (8pF, 60 Ohms) has no direct electrical equivalent among the listed substitutes. However, the following parts match the 60 Ohm ESR specification:

7M-40.000MEEQ-T (TXC CORPORATION): Identical electrical characteristics except load capacitance is 10pF instead of 8pF. Same package dimensions and height. RoHS Compliant. Higher inventory availability (1349 pcs).
403C11A40M00000 (CTS-Frequency Controls): Identical electrical characteristics to 7M-40.000MEEQ-T (10pF, 60 Ohms). Same package dimensions and height. ROHS3 Compliant. Significantly higher inventory (16957 pcs).
ABM11-40.000MHZ-B1U-T3 (Abracon LLC): Matches 60 Ohm ESR and 10pF load capacitance. Smaller package (2.00mm x 1.60mm) with lower height (0.59mm). ROHS3 Compliant. High inventory (16251 pcs).

Category 2: Compatible Alternatives (Lower ESR, Variable Load Capacitance)

The following parts operate at 40 Ohm ESR with load capacitance ranging from 6pF to 8pF:

ABM10W-40.0000MHZ-8-B1U-T3 (Abracon LLC): Matches 8pF load capacitance with 40 Ohm ESR. Smaller package (2.50mm x 2.00mm) with lower height (0.60mm). ROHS3 Compliant. High inventory (4899 pcs).
ABM11W-40.0000MHZ-8-B1U-T3 (Abracon LLC): Matches 8pF load capacitance with 40 Ohm ESR. Smallest package (2.00mm x 1.60mm) with lowest height (0.50mm). ROHS3 Compliant. Moderate inventory (2133 pcs).
ABM10W-40.0000MHZ-7-B1U-T3 (Abracon LLC): 7pF load capacitance with 40 Ohm ESR. Smaller package (2.50mm x 2.00mm). ROHS3 Compliant. Moderate inventory (3109 pcs).
ABM11W-40.0000MHZ-7-B1U-T3 (Abracon LLC): 7pF load capacitance with 40 Ohm ESR. Smallest package (2.00mm x 1.60mm). ROHS3 Compliant. Moderate inventory (3794 pcs).
ABM11W-40.0000MHZ-6-B1U-T3 (Abracon LLC): 6pF load capacitance with 40 Ohm ESR. Smallest package (2.00mm x 1.60mm). ROHS3 Compliant. High inventory (8794 pcs).

Category 3: Mixed ESR Alternatives

ECS-400-10-33B-CKM-TR (ECS Inc.): 10pF load capacitance with 40 Ohm ESR. Maintains original package dimensions (3.20mm x 2.50mm). ROHS3 Compliant. Moderate inventory (1328 pcs).
ECS-400-10-37-CKM-TR (ECS Inc.): 10pF load capacitance with 50 Ohm ESR. Smaller package (2.00mm x 1.60mm). ROHS3 Compliant. Highest inventory availability (35571 pcs).

Selection Criteria:

All substitute parts maintain 40.0000 MHz frequency and ±10ppm stability.
All substitute parts support -20°C to 70°C operating temperature range.
All substitute parts are RoHS Compliant or ROHS3 Compliant.
Load capacitance and ESR variations require circuit design verification to ensure oscillator loop stability and frequency accuracy.
Package dimension changes require PCB footprint compatibility assessment.

Frequently Asked Questions (FAQ)

Q1: Can I substitute the 7M-40.000MEEV-T with a part having different load capacitance?

A: Load capacitance substitution is possible only if the oscillator circuit design accommodates the variation. The 7M-40.000MEEV-T specifies 8pF load capacitance. Substitutes with 6pF, 7pF, or 10pF load capacitance will shift the oscillation frequency unless the circuit's external capacitor network is adjusted accordingly. Circuit simulation or testing is required to confirm frequency accuracy within ±10ppm specification.

Q2: What is the difference between 60 Ohm and 40 Ohm ESR substitutes?

A: ESR (Equivalent Series Resistance) affects oscillator startup time, power consumption, and frequency stability. The 7M-40.000MEEV-T specifies 60 Ohm ESR. Substitutes with 40 Ohm ESR will have lower power dissipation and faster startup but may require circuit tuning to maintain frequency accuracy. The oscillator circuit design determines whether this variation is acceptable.

Q3: Are the smaller package Abracon parts (2.00mm x 1.60mm) compatible with the original 3.20mm x 2.50mm footprint?

A: No. Smaller packages require different PCB footprints and cannot be directly substituted without board redesign. However, if board space permits, smaller packages offer advantages in compact designs. Verify PCB layout compatibility before selection.

Q4: Which substitute offers the best inventory availability?

A: The ECS-400-10-37-CKM-TR offers the highest inventory with 35571 pieces in stock. This part specifies 40 Ohm ESR and 10pF load capacitance with a 2.00mm x 1.60mm package. The 403C11A40M00000 from CTS-Frequency Controls offers 16957 pieces with 60 Ohm ESR and 10pF load capacitance in the original 3.20mm x 2.50mm package.

Q5: Are all substitute parts RoHS compliant?

A: Yes. The 7M-40.000MEEV-T is RoHS Compliant. All listed substitute parts are either RoHS Compliant or ROHS3 Compliant, meeting current environmental and regulatory requirements.

Q6: Can I use ABM11-40.000MHZ-B1U-T3 as a direct replacement for the 7M-40.000MEEV-T?

A: The ABM11-40.000MHZ-B1U-T3 matches the 60 Ohm ESR and 10pF load capacitance electrical characteristics. However, it uses a smaller package (2.00mm x 1.60mm versus 3.20mm x 2.50mm) and lower height (0.59mm versus 0.80mm). PCB footprint compatibility must be verified. If the footprint is compatible, this part is electrically suitable.

Q7: What is MSL 1 rating and why does it matter?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life with no moisture precautions required. The 7M-40.000MEEV-T carries MSL 1 rating. Most Abracon substitutes are rated "Not Applicable," indicating they do not require moisture sensitivity management. This difference does not affect substitution compatibility.

Q8: Which substitute is best for space-constrained applications?

A: The ABM11W-40.0000MHZ-8-B1U-T3 offers the smallest footprint (2.00mm x 1.60mm) and lowest height (0.50mm) while maintaining 8pF load capacitance matching the original part. This part is suitable for compact designs where board space is critical.

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