7M40000010 40 MHz Crystal Equivalent & Substitute Parts

Part Overview

The TXC CORPORATION 7M40000010 is a 40 MHz surface mount crystal oscillator designed for precision frequency control applications. This Active product operates across the industrial temperature range of -30°C to 85°C with ±10ppm frequency stability. The component is packaged in a compact 4-SMD, No Lead configuration measuring 3.20mm × 2.50mm with a maximum seated height of 0.80mm. RoHS Compliant and MSL 1 rated, this crystal is suitable for applications requiring stable 40 MHz reference frequencies with 12pF load capacitance specifications. Equivalent and substitute parts are identified based on matching frequency, frequency stability, operating temperature range, mounting type, and package configuration.

Substiute Parts

7M40000010

TXC CORPORATIONIn Stock: 10887M40000010 Datasheet

Current PartRFQ

ECS-400-10-36-CKY-TR

ECS Inc.In Stock: 5633ECS-400-10-36-CKY-TR Datasheet

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ECS-400-10-36B-CKY-TR

ECS Inc.In Stock: 2866ECS-400-10-36B-CKY-TR Datasheet

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ECS-400-10-37B-CKY-TR

ECS Inc.In Stock: 1952ECS-400-10-37B-CKY-TR Datasheet

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ECS-400-9-36B-CKY-TR

ECS Inc.In Stock: 1445ECS-400-9-36B-CKY-TR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 7M40000010 is determined by the following critical parameters: frequency (40 MHz), frequency stability (±10ppm), operating temperature range (-30°C to 85°C), mounting type (Surface Mount), and package configuration (4-SMD, No Lead). Load capacitance represents a secondary consideration; parts with 10pF or 9pF load capacitance may function as substitutes in applications where the circuit design accommodates alternative load capacitance values. All substitute parts identified are manufactured by ECS Inc., maintain Active product status, and comply with RoHS3 and REACH requirements. Equivalent Series Resistance (ESR) values vary among substitutes but remain within acceptable ranges for 40 MHz crystal applications. Physical dimensions differ among substitute options, with smaller form factors available in certain models.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain Active product status and comply with RoHS3 and REACH requirements, ensuring regulatory alignment with the original 7M40000010. The ECS Inc. ECX series crystals provide direct functional equivalence at the 40 MHz frequency with matching ±10ppm stability across the -30°C to 85°C operating temperature range.

ECS-400-10-36-CKY-TR and ECS-400-10-36B-CKY-TR are suitable substitutes for applications where 10pF load capacitance is acceptable. These parts offer reduced physical dimensions (2.50mm × 2.00mm) compared to the original part, enabling space optimization in compact PCB layouts. The ECS-400-10-36B-CKY-TR variant features lower ESR (30 Ohms) compared to the standard 36 variant (40 Ohms).

ECS-400-10-37B-CKY-TR provides the most compact form factor (2.00mm × 1.60mm) with the lowest seated height (0.50mm), suitable for applications with severe space constraints. This variant maintains 10pF load capacitance and 40 Ohms ESR specifications.

ECS-400-9-36B-CKY-TR is applicable where 9pF load capacitance compatibility exists within the circuit design. This part shares the 2.50mm × 2.00mm footprint with the 36B variant and features 30 Ohms ESR.

Load capacitance variation between the original 12pF specification and substitute options (10pF or 9pF) requires circuit-level verification to ensure frequency accuracy and oscillation stability within the target application.

Frequently Asked Questions (FAQ)

Q: Can ECS-400-10-36-CKY-TR directly replace the 7M40000010 without circuit modifications?

A: Direct replacement is possible if the circuit design accommodates 10pF load capacitance. The frequency (40 MHz) and stability (±10ppm) specifications are identical. Load capacitance differences may require tuning adjustments in the oscillator circuit to maintain target frequency accuracy.

Q: What is the primary difference between ECS-400-10-36-CKY-TR and ECS-400-10-36B-CKY-TR?

A: Both parts operate at 40 MHz with ±10ppm stability and 10pF load capacitance. The primary difference is ESR: the standard 36 variant has 40 Ohms ESR, while the 36B variant has 30 Ohms ESR. The 36B variant also has a slightly higher maximum seated height (0.65mm vs. 0.60mm).

Q: Is ECS-400-10-37B-CKY-TR suitable for space-constrained applications?

A: Yes. The ECS-400-10-37B-CKY-TR offers the smallest footprint (2.00mm × 1.60mm) and lowest seated height (0.50mm) among the substitute options. It maintains 40 MHz frequency and ±10ppm stability with 10pF load capacitance and 40 Ohms ESR.

Q: What are the implications of using a 9pF load capacitance part (ECS-400-9-36B-CKY-TR) instead of the original 12pF specification?

A: The ECS-400-9-36B-CKY-TR operates at 40 MHz with ±10ppm stability but with 9pF load capacitance. This requires circuit design verification to ensure the oscillator circuit can accommodate the lower load capacitance value while maintaining frequency accuracy and stable oscillation.

Q: Are all substitute parts RoHS compliant?

A: Yes. All ECS Inc. substitute parts listed are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: What is the inventory availability of substitute parts?

A: ECS-400-10-36-CKY-TR has 5575 pcs in stock; ECS-400-10-36B-CKY-TR has 2786 pcs; ECS-400-10-37B-CKY-TR has 1913 pcs; ECS-400-9-36B-CKY-TR has 1435 pcs. The original 7M40000010 has 1077 pcs in stock.

Q: Do all substitute parts use the same 4-SMD, No Lead package configuration?

A: Yes. All substitute parts use 4-SMD, No Lead packaging, ensuring PCB footprint compatibility. However, physical dimensions vary: the original is 3.20mm × 2.50mm, while substitutes range from 2.00mm × 1.60mm to 2.50mm × 2.00mm.