8Q-40.000MEEV-T Equivalent & Substitute Parts Reference

Part Overview

The 8Q-40.000MEEV-T is a 40 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION. This surface mount device operates at ±10ppm frequency stability with 8pF load capacitance and 80 Ohms equivalent series resistance. The part is Active status and RoHS Compliant, designed for applications requiring precise 40 MHz frequency generation in compact 4-SMD, No Lead packages measuring 1.60mm x 1.20mm.

Substitute parts are identified when equivalent electrical and mechanical parameters align with the main part specifications, enabling direct replacement in circuit designs without performance degradation.

Key Parameters

Parameter	Value	Unit
Frequency	40.0000	MHz
Frequency Stability	±10	ppm
Load Capacitance	8	pF
ESR (Equivalent Series Resistance)	80	Ohms
Operating Mode	Fundamental	—
Package / Case	4-SMD, No Lead	—
Size / Dimension	1.60mm x 1.20mm	—
Operating Temperature Range	-20°C ~ 70°C	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts are classified into two categories based on parameter alignment with the 8Q-40.000MEEV-T:

Direct Substitutes (Identical Electrical & Mechanical Parameters): Parts sharing all critical parameters: 40 MHz frequency, ±10ppm stability, 8pF load capacitance, 80 Ohms ESR, 4-SMD No Lead package, and -20°C ~ 70°C operating temperature range.

Compatible Substitutes (Equivalent Electrical Performance, Parameter Variations): Parts meeting frequency, stability, and load capacitance requirements but with variations in ESR, operating temperature range, or packaging format. These parts function electrically within the same application scope but may require circuit validation for specific thermal or impedance-sensitive designs.

Parametric Equivalents (Identical Specifications, Alternative Sourcing): Parts manufactured by different suppliers with identical electrical and mechanical specifications, enabling supply chain flexibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Frequency (MHz)	Frequency Stability (ppm)	Load Capacitance (pF)	ESR (Ohms)	Operating Temperature (°C)	Package	Size (mm)	RoHS Status	Inventory (Pcs)
8Q-40.000MEEV-T	TXC CORPORATION	40.0000	±10	8	80	-20 ~ 70	4-SMD, No Lead	1.60 x 1.20	RoHS Compliant	3617
ABM12W-40.0000MHZ-8-B1U-T3	Abracon LLC	40.0000	±10	8	50	-20 ~ 70	4-SMD, No Lead	1.60 x 1.20	ROHS3 Compliant	11063
ABM12W-40.0000MHZ-7-B1U-T3	Abracon LLC	40.0000	±10	7	50	-20 ~ 70	4-SMD, No Lead	1.60 x 1.20	ROHS3 Compliant	1086
ABM12W-40.0000MHZ-6-B1U-T3	Abracon LLC	40.0000	±10	6	50	-20 ~ 70	4-SMD, No Lead	1.60 x 1.20	ROHS3 Compliant	33975
Q 40,0-JXS11-8-10/10-FU-LF	Jauch Quartz	40.0000	±10	8	60	-20 ~ 70	4-SMD, No Lead	1.60 x 1.20	ROHS3 Compliant	9483
Q 40,0-JXS11-10-10/10-FU-LF	Jauch Quartz	40.0000	±10	10	60	-20 ~ 70	4-SMD, No Lead	1.60 x 1.20	ROHS3 Compliant	1961
ECS-400-8-47-JTN-TR	ECS Inc.	40.0000	±20	8	80	-40 ~ 85	4-SMD, No Lead	1.60 x 1.20	ROHS3 Compliant	1096
8Q-40.000MEEV-T (FTS)	FTS	40.0000	±10	8	80	-20 ~ 70	4-SMD, No Lead	1.60 x 1.20	RoHS Compliant	4147

Engineering Selection Recommendations

Primary Substitute (Highest Compatibility): ABM12W-40.0000MHZ-8-B1U-T3 (Abracon LLC) provides direct electrical substitution with identical frequency, stability, load capacitance, and operating temperature range. ESR reduction from 80 Ohms to 50 Ohms improves circuit efficiency. ROHS3 compliance exceeds RoHS requirements. High inventory availability (11,063 pcs) supports production continuity.

Secondary Substitutes (Compatible with Parameter Variations): Q 40,0-JXS11-8-10/10-FU-LF (Jauch Quartz) matches all critical electrical parameters with ESR of 60 Ohms, positioned between the main part and ABM12W variant. Suitable for applications where ESR tolerance permits intermediate values. Inventory of 9,483 pcs ensures supply availability.

Extended Temperature Range Alternative: ECS-400-8-47-JTN-TR (ECS Inc.) maintains 40 MHz frequency, 8pF load capacitance, and 80 Ohms ESR with expanded operating temperature range (-40°C ~ 85°C). Frequency stability of ±20ppm represents relaxed tolerance compared to ±10ppm specification. Selection requires confirmation that ±20ppm stability meets application requirements.

Load Capacitance Variants: ABM12W-40.0000MHZ-6-B1U-T3 and ABM12W-40.0000MHZ-7-B1U-T3 provide alternative load capacitance values (6pF and 7pF respectively) with 50 Ohms ESR. These parts require circuit design validation to confirm load capacitance compatibility with oscillator tank circuit specifications.

Parametric Equivalent (Supply Chain Flexibility): 8Q-40.000MEEV-T (FTS) provides identical specifications to the main part, enabling alternative sourcing from FTS with 4,147 pcs inventory.

Frequently Asked Questions (FAQ)

Q: Can ABM12W-40.0000MHZ-8-B1U-T3 directly replace 8Q-40.000MEEV-T? A: Yes. Both parts operate at 40 MHz with ±10ppm stability, 8pF load capacitance, and identical package dimensions (1.60mm x 1.20mm, 4-SMD No Lead). ESR difference (50 Ohms vs. 80 Ohms) reduces circuit losses, improving efficiency without affecting frequency accuracy.

Q: What is the significance of load capacitance differences between substitute parts? A: Load capacitance determines the crystal's resonant frequency in the oscillator circuit. The 8Q-40.000MEEV-T specifies 8pF load capacitance. Substitutes with 6pF, 7pF, or 10pF load capacitance require circuit design validation to confirm the oscillator tank circuit provides matching load capacitance. Mismatched load capacitance causes frequency deviation.

Q: Why does ECS-400-8-47-JTN-TR have ±20ppm stability instead of ±10ppm? A: ECS-400-8-47-JTN-TR is specified with ±20ppm frequency tolerance, representing a relaxed specification compared to the 8Q-40.000MEEV-T (±10ppm). This part is suitable only for applications where ±20ppm frequency accuracy is acceptable. Verify application frequency tolerance requirements before selection.

Q: Are all substitute parts RoHS compliant? A: Yes. The main part (8Q-40.000MEEV-T) is RoHS Compliant. All listed substitutes are either RoHS Compliant or ROHS3 Compliant, meeting regulatory requirements for hazardous substance restrictions.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging? A: Cut Tape packaging supplies individual components on tape segments, suitable for small-quantity orders and prototyping. Tape & Reel packaging supplies components on continuous reels, optimized for high-volume automated assembly. Both formats contain identical components; packaging selection depends on production volume and assembly equipment compatibility.

Q: Can I use Q 40,0-JXS11-10-10/10-FU-LF with 10pF load capacitance in place of the 8pF specification? A: No, without circuit design validation. Load capacitance directly affects oscillator frequency. The 10pF load capacitance will cause frequency deviation from 40 MHz. Substitution requires oscillator circuit redesign or confirmation that the circuit can accommodate 10pF load capacitance without exceeding frequency tolerance limits.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity? A: MSL 1 indicates the component has unlimited shelf life under standard storage conditions (23°C, 50% relative humidity). No special moisture-control packaging or baking procedures are required before soldering, simplifying inventory management and assembly processes.

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