7M40000006 40 MHz Crystal Equivalent & Substitute Parts

Part Overview

The 7M40000006 is a 40 MHz surface mount crystal manufactured by TXC CORPORATION, designed for precision frequency control applications requiring ±10ppm stability. This Active product operates across the -20°C to 70°C temperature range in a compact 4-SMD, No Lead package measuring 3.20mm × 2.50mm with 0.80mm maximum seated height. The device features 9pF load capacitance and RoHS compliance with MSL 1 (Unlimited) moisture sensitivity rating.

Equivalent and substitute parts are identified when designs require alternative sourcing due to inventory constraints, supply chain optimization, or when circuit parameters permit load capacitance variation within acceptable operating margins. Substitute crystals maintain identical frequency (40 MHz), frequency stability (±10ppm), operating temperature range (-20°C to 70°C), and surface mount package configuration while differing in load capacitance, ESR characteristics, or physical dimensions.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Frequency	40.0000	MHz	Critical - Must match exactly
Frequency Stability	±10	ppm	Critical - Must match or exceed
Load Capacitance	9	pF	Primary - Determines circuit compatibility
Operating Temperature Range	-20 to 70	°C	Critical - Must match or exceed
Mounting Type	Surface Mount	-	Critical - Must match
Package / Case	4-SMD, No Lead	-	Critical - Must match
RoHS Status	RoHS Compliant	-	Regulatory - Must maintain compliance
MSL Rating	1 (Unlimited)	-	Handling - Affects storage requirements

Substitute Part Grouping Explanation

Substitution logic for 40 MHz crystals is determined by the following parameters:

Critical Parameters (Must Match):

Frequency: 40.0000 MHz (exact match required)
Frequency Stability: ±10ppm (substitute must equal or exceed)
Operating Temperature: -20°C to 70°C (substitute must equal or exceed)
Mounting Type: Surface Mount (must match)
Package Type: 4-SMD, No Lead (must match)

Primary Variation Parameter:

Load Capacitance: The 7M40000006 specifies 9pF. Substitutes with 7pF, 8pF, or 10pF load capacitance are functionally equivalent when circuit design accommodates the capacitance variation through tuning networks or when the application permits load capacitance tolerance.

Secondary Variation Parameters:

ESR (Equivalent Series Resistance): Ranges from 40 to 60 Ohms across substitutes. Lower ESR values (40 Ohms) provide improved oscillator startup characteristics.
Physical Dimensions: Substitutes vary between 3.20mm × 2.50mm and 2.00mm × 1.60mm footprints. Smaller packages (2.00mm × 1.60mm) require PCB layout verification.
Height: Ranges from 0.50mm to 0.80mm seated height. Taller packages may affect board assembly clearance.

Regulatory Parameters (Must Maintain):

RoHS Compliance: All substitutes maintain RoHS3 or RoHS Compliant status
REACH Status: All substitutes are REACH Unaffected
ECCN Classification: All substitutes classified as EAR99

Substitutes are grouped by load capacitance category: 7pF group, 8pF group, 9pF group (direct equivalent), and 10pF group.

Parameter Comparison

Part Number	Manufacturer	Frequency (MHz)	Stability (ppm)	Load Cap (pF)	ESR (Ohms)	Package	Dimensions (mm)	Height Max (mm)	Temp Range (°C)	RoHS Status
7M40000006	TXC CORPORATION	40.0000	±10	9	-	4-SMD, No Lead	3.20 × 2.50	0.80	-20 to 70	RoHS Compliant
7M-40.000MEEQ-T	TXC CORPORATION	40.0000	±10	10	60	4-SMD, No Lead	3.20 × 2.50	0.80	-20 to 70	RoHS Compliant
403C11A40M00000	CTS-Frequency Controls	40.0000	±10	10	60	4-SMD, No Lead	3.20 × 2.50	0.80	-20 to 70	ROHS3 Compliant
ABM10W-40.0000MHZ-7-B1U-T3	Abracon LLC	40.0000	±10	7	40	4-SMD, No Lead	2.50 × 2.00	0.60	-20 to 70	ROHS3 Compliant
ABM10W-40.0000MHZ-8-B1U-T3	Abracon LLC	40.0000	±10	8	40	4-SMD, No Lead	2.50 × 2.00	0.60	-20 to 70	ROHS3 Compliant
ABM11-40.000MHZ-B1U-T3	Abracon LLC	40.0000	±10	10	60	4-SMD, No Lead	2.00 × 1.60	0.59	-20 to 70	ROHS3 Compliant
ABM11W-40.0000MHZ-7-B1U-T3	Abracon LLC	40.0000	±10	7	40	4-SMD, No Lead	2.00 × 1.60	0.50	-20 to 70	ROHS3 Compliant
ABM11W-40.0000MHZ-8-B1U-T3	Abracon LLC	40.0000	±10	8	40	4-SMD, No Lead	2.00 × 1.60	0.50	-20 to 70	ROHS3 Compliant
ECS-400-10-33B-CKM-TR	ECS Inc.	40.0000	±10	10	40	4-SMD, No Lead	3.20 × 2.50	0.80	-20 to 70	ROHS3 Compliant
ECS-400-10-37-CKM-TR	ECS Inc.	40.0000	±10	10	50	4-SMD, No Lead	2.00 × 1.60	0.55	-20 to 70	ROHS3 Compliant
ECS-400-8-36CKM	ECS Inc.	40.0000	±10	8	40	4-SMD, No Lead	2.50 × 2.00	0.65	-20 to 70	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Same Load Capacitance - 9pF):

No substitute parts with 9pF load capacitance are listed in the provided data. The 7M40000006 remains the primary selection when 9pF load capacitance is a circuit requirement.

Load Capacitance Substitution Categories:

10pF Load Capacitance Group (Closest to 9pF):

7M-40.000MEEQ-T (TXC CORPORATION): Identical footprint (3.20mm × 2.50mm), same height (0.80mm), same manufacturer series. ESR 60 Ohms. RoHS Compliant. Inventory: 1349 Pcs.
403C11A40M00000 (CTS-Frequency Controls): Identical footprint (3.20mm × 2.50mm), same height (0.80mm). ESR 60 Ohms. ROHS3 Compliant. Highest inventory: 16957 Pcs.
ABM11-40.000MHZ-B1U-T3 (Abracon LLC): Smaller footprint (2.00mm × 1.60mm), lower height (0.59mm). ESR 60 Ohms. ROHS3 Compliant. Inventory: 16251 Pcs.
ECS-400-10-33B-CKM-TR (ECS Inc.): Identical footprint (3.20mm × 2.50mm), same height (0.80mm). ESR 40 Ohms (lower than main part). ROHS3 Compliant. Inventory: 1328 Pcs.
ECS-400-10-37-CKM-TR (ECS Inc.): Smaller footprint (2.00mm × 1.60mm), lower height (0.55mm). ESR 50 Ohms. ROHS3 Compliant. Highest inventory among compact packages: 35571 Pcs.

8pF Load Capacitance Group:

ABM10W-40.0000MHZ-8-B1U-T3 (Abracon LLC): Footprint 2.50mm × 2.00mm, height 0.60mm. ESR 40 Ohms. ROHS3 Compliant. Inventory: 4899 Pcs.
ABM11W-40.0000MHZ-8-B1U-T3 (Abracon LLC): Footprint 2.00mm × 1.60mm, height 0.50mm. ESR 40 Ohms. ROHS3 Compliant. Inventory: 2133 Pcs.
ECS-400-8-36CKM (ECS Inc.): Footprint 2.50mm × 2.00mm, height 0.65mm. ESR 40 Ohms. ROHS3 Compliant. Inventory: 22675 Pcs.

7pF Load Capacitance Group:

ABM10W-40.0000MHZ-7-B1U-T3 (Abracon LLC): Footprint 2.50mm × 2.00mm, height 0.60mm. ESR 40 Ohms. ROHS3 Compliant. Inventory: 3109 Pcs.
ABM11W-40.0000MHZ-7-B1U-T3 (Abracon LLC): Footprint 2.00mm × 1.60mm, height 0.50mm. ESR 40 Ohms. ROHS3 Compliant. Inventory: 3794 Pcs.

Selection Criteria by Application Constraint:

When PCB footprint must remain 3.20mm × 2.50mm with 0.80mm height (identical to 7M40000006): Select 7M-40.000MEEQ-T, 403C11A40M00000, or ECS-400-10-33B-CKM-TR.

When compact footprint (2.00mm × 1.60mm) is acceptable: Select ECS-400-10-37-CKM-TR for 10pF load capacitance or ABM11W series for 7pF/8pF load capacitance.

When inventory availability is critical: 403C11A40M00000 (16957 Pcs), ECS-400-10-37-CKM-TR (35571 Pcs), or ECS-400-8-36CKM (22675 Pcs) provide maximum stock levels.

When lower ESR (40 Ohms vs. 60 Ohms) improves oscillator performance: Select ECS-400-10-33B-CKM-TR, ABM10W series, ABM11W series, or ECS-400-8-36CKM.

All substitutes maintain Active product status, RoHS compliance (RoHS3 or RoHS Compliant), REACH Unaffected status, and EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can I substitute a 10pF load capacitance crystal for the 9pF 7M40000006?

A: Load capacitance substitution depends on circuit design. The oscillator tuning network must accommodate the 1pF difference. If the circuit includes adjustable capacitive tuning or was designed with load capacitance tolerance margin, 10pF substitutes (7M-40.000MEEQ-T, 403C11A40M00000, ABM11-40.000MHZ-B1U-T3, ECS-400-10-33B-CKM-TR, ECS-400-10-37-CKM-TR) are functionally compatible. Verify oscillator startup and frequency accuracy with your specific circuit design.

Q: What is the difference between 7pF, 8pF, 9pF, and 10pF load capacitance crystals?

A: Load capacitance specifies the external capacitive load the crystal expects to see for rated frequency accuracy. A crystal specified at 9pF requires 9pF of external load capacitance (typically two equal capacitors to ground) for the oscillator to operate at the specified frequency. Using a different load capacitance value shifts the oscillation frequency. Substitutes with different load capacitance values require circuit tuning adjustment or must be used in circuits designed to tolerate load capacitance variation.

Q: Are Abracon ABM10W and ABM11W series interchangeable with TXC 7M series?

A: Both series meet the same frequency (40 MHz), stability (±10ppm), temperature range (-20°C to 70°C), and package type (4-SMD, No Lead) requirements. Primary differences are load capacitance (7pF, 8pF, or 10pF), ESR (40 or 60 Ohms), and physical dimensions. ABM10W measures 2.50mm × 2.00mm with 0.60mm height. ABM11W measures 2.00mm × 1.60mm with 0.50mm height. TXC 7M measures 3.20mm × 2.50mm with 0.80mm height. Interchangeability requires matching load capacitance and verifying PCB layout accommodates the different footprint.

Q: What does ESR (Equivalent Series Resistance) mean for crystal selection?

A: ESR is the internal resistance of the crystal element. Lower ESR values (40 Ohms) result in easier oscillator startup, lower power consumption, and better frequency stability under load variations. Higher ESR values (60 Ohms) may require higher drive levels or larger tuning capacitors. For most applications, lower ESR is preferable. Substitutes with 40 Ohms ESR (Abracon ABM series, ECS-400-10-33B-CKM-TR, ECS-400-8-36CKM) offer improved performance compared to 60 Ohms alternatives.

Q: Can I use a smaller footprint crystal (2.00mm × 1.60mm) in place of the larger 3.20mm × 2.50mm 7M40000006?

A: Physically smaller crystals require PCB layout modification. The 2.00mm × 1.60mm footprint (ABM11 series, ECS-400-10-37-CKM-TR) is not compatible with pads designed for 3.20mm × 2.50mm spacing. However, if your PCB design permits footprint change, compact packages offer space savings and lower height (0.50mm to 0.59mm vs. 0.80mm). Verify PCB layout, trace routing, and component placement clearance before substituting with compact packages.

Q: Which substitute offers the best inventory availability?

A: ECS-400-10-37-CKM-TR provides the highest inventory at 35571 Pcs, followed by ECS-400-8-36CKM at 22675 Pcs, and 403C11A40M00000 at 16957 Pcs. These three parts offer reliable supply for high-volume applications. All three maintain ROHS3 compliance, REACH Unaffected status, and EAR99 classification.

Q: Are all substitutes RoHS compliant?

A: Yes. The main part 7M40000006 is RoHS Compliant. All listed substitutes maintain either RoHS Compliant or ROHS3 Compliant status. ROHS3 represents the current RoHS 2.0 directive compliance standard. Both designations satisfy RoHS regulatory requirements for electronic components.

Q: What is MSL (Moisture Sensitivity Level) and why does it matter?

A: MSL indicates how sensitive the component is to moisture absorption during storage and handling. MSL 1 (Unlimited) means the component has no moisture sensitivity restrictions and can be stored at room temperature without special desiccant packaging. The 7M40000006 specifies MSL 1. Most Abracon substitutes specify "Not Applicable" MSL, indicating no moisture sensitivity. ECS substitutes specify MSL 1. All substitutes are compatible with standard storage and handling procedures.

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