8Q-26.000MEEC-T Equivalent & Substitute Parts

Part Overview

The 8Q-26.000MEEC-T is a 26 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION in a 4-SMD, No Lead surface mount package. This component operates at ±10ppm frequency stability with 9pF load capacitance and 100 Ohms equivalent series resistance. The part is Active status and RoHS Compliant with MSL 1 rating, indicating unlimited moisture sensitivity protection. Substitute parts are identified to address inventory availability, extended lead times, or design flexibility requirements while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Frequency	26	MHz
Frequency Stability	±10	ppm
Frequency Tolerance	±10	ppm
Load Capacitance	9	pF
ESR (Equivalent Series Resistance)	100	Ohms
Operating Mode	Fundamental	—
Operating Temperature Range	-20 to 70	°C
Mounting Type	Surface Mount	—
Package / Case	4-SMD, No Lead	—
Size / Dimension	1.60 x 1.20	mm
Height - Seated (Max)	0.40	mm
RoHS Status	RoHS Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 8Q-26.000MEEC-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Frequency: 26 MHz
Frequency Stability: ±10ppm
Frequency Tolerance: ±10ppm
Operating Mode: Fundamental
Operating Temperature Range: -20°C to 70°C
Mounting Type: Surface Mount
Package / Case: 4-SMD, No Lead
Size / Dimension: 1.60mm x 1.20mm (or within tolerance)

Flexible Parameters (Allow Variation):

Load Capacitance: 7pF, 8pF, or 9pF (circuit design dependent)
ESR: 100 Ohms or 150 Ohms (within circuit tolerance)
Height - Seated: 0.35mm to 0.40mm (PCB clearance dependent)

Substitute parts are grouped by load capacitance value. Parts with identical load capacitance (9pF) are direct parametric equivalents. Parts with 7pF or 8pF load capacitance are functionally equivalent but require circuit design verification for oscillator tank impedance matching.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Frequency (MHz)	Frequency Stability (ppm)	Load Capacitance (pF)	ESR (Ohms)	Size (mm)	Height Max (mm)	RoHS Status	Inventory (Pcs)
8Q-26.000MEEC-T	TXC CORPORATION	26	±10	9	100	1.60 x 1.20	0.40	RoHS Compliant	1074
8Q-26.000MEEY-T	FTS	26	±10	7	100	1.60 x 1.20	0.40	RoHS Compliant	3705
ECS-260-9-47-CKM-TR	ECS Inc.	26	±10	9	100	1.60 x 1.20	0.35	ROHS3 Compliant	6826
ABM12-115-26.000MHZ-T3	Abracon LLC	26	±10	8	100	1.65 x 1.25	0.40	ROHS3 Compliant	14269
ABM12W-26.0000MHZ-7-B1U-T3	Abracon LLC	26	±10	7	100	1.60 x 1.20	0.40	ROHS3 Compliant	1616
ABM12W-26.0000MHZ-8-B1U-T3	Abracon LLC	26	±10	8	100	1.60 x 1.20	0.40	ROHS3 Compliant	1125
ECS-260-8-47-CKM-TR	ECS Inc.	26	±10	8	100	1.60 x 1.20	0.35	ROHS3 Compliant	19491
ECS-260-8-47Q-CKM-TR	ECS Inc.	26	±10	8	150	1.60 x 1.20	0.40	ROHS3 Compliant	1744
8Q-26.000MEEC-T (FTS)	FTS	26	±10	9	100	1.60 x 1.20	0.40	RoHS Compliant	5692

Engineering Selection Recommendations

Direct Parametric Equivalents (9pF Load Capacitance):

The ECS-260-9-47-CKM-TR and 8Q-26.000MEEC-T (FTS variant) are direct parametric equivalents to the primary 8Q-26.000MEEC-T. Both maintain identical frequency, stability, load capacitance, and ESR specifications. The ECS-260-9-47-CKM-TR offers the highest inventory availability (6826 pcs) and ROHS3 compliance. The FTS variant provides 5692 pcs in stock. Selection between these three parts is based on procurement lead time and supplier preference, with no circuit redesign required.

Functional Equivalents (7pF and 8pF Load Capacitance):

Parts with 7pF or 8pF load capacitance (ABM12-115-26.000MHZ-T3, ABM12W-26.0000MHZ-7-B1U-T3, ABM12W-26.0000MHZ-8-B1U-T3, ECS-260-8-47-CKM-TR) are functionally equivalent but operate at different load impedance points. These substitutes are valid when the oscillator circuit design accommodates the alternative load capacitance value. The ECS-260-8-47-CKM-TR provides the highest inventory (19491 pcs) among 8pF variants and maintains 100 Ohms ESR matching the primary part.

ESR Variant (150 Ohms):

The ECS-260-8-47Q-CKM-TR differs by ESR specification (150 Ohms versus 100 Ohms) and includes AEC-Q200 automotive qualification. This part is suitable only when circuit design permits higher series resistance and automotive-grade reliability is required.

Dimensional Considerations:

All substitute parts maintain the 1.60mm x 1.20mm footprint or within tolerance (ABM12-115-26.000MHZ-T3 at 1.65mm x 1.25mm). Height variations (0.35mm to 0.40mm) are within typical PCB clearance specifications and do not restrict substitution.

Compliance Status:

All substitute parts maintain RoHS compliance. ROHS3 variants (ECS Inc. and Abracon LLC) provide enhanced compliance documentation. MSL 1 rating is consistent across all parts, indicating unlimited moisture sensitivity protection suitable for standard storage and handling.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 8Q-26.000MEEC-T with a part having 8pF load capacitance?

A: Yes, 8pF load capacitance parts (ABM12W-26.0000MHZ-8-B1U-T3, ECS-260-8-47-CKM-TR, ABM12-115-26.000MHZ-T3) are functionally equivalent. The oscillator circuit must be designed to accommodate 8pF load impedance. Verify that your circuit design specifies load capacitance tolerance or accepts multiple values. No PCB layout changes are required.

Q: What is the difference between the TXC and FTS variants of the 8Q-26.000MEEC-T?

A: Both the TXC CORPORATION 8Q-26.000MEEC-T and FTS 8Q-26.000MEEC-T are parametrically identical with 26 MHz frequency, ±10ppm stability, 9pF load capacitance, and 100 Ohms ESR. The FTS variant offers higher inventory availability (5692 pcs versus 1074 pcs). Selection is based on supplier availability and procurement preference.

Q: Can I use the ECS-260-8-47Q-CKM-TR with 150 Ohms ESR as a direct substitute?

A: The ECS-260-8-47Q-CKM-TR is not a direct substitute due to ESR specification difference (150 Ohms versus 100 Ohms) and 8pF load capacitance. This part is suitable only when your circuit design explicitly permits 150 Ohms ESR and 8pF load capacitance. The AEC-Q200 automotive qualification is an additional feature not present in the primary part.

Q: Are all substitute parts RoHS compliant?

A: Yes, all substitute parts listed are RoHS compliant. TXC CORPORATION and FTS variants carry RoHS Compliant status. Abracon LLC and ECS Inc. variants carry ROHS3 Compliant status, which represents enhanced compliance documentation. Both compliance levels are acceptable for standard applications.

Q: What is the impact of height variation between 0.35mm and 0.40mm?

A: Height variation between 0.35mm (ECS Inc. parts) and 0.40mm (TXC, FTS, Abracon parts) is within standard PCB clearance specifications and does not restrict substitution. Verify PCB design clearance to component leads and adjacent components. No design changes are required for typical applications.

Q: Which substitute part offers the best inventory availability?

A: The ECS-260-8-47-CKM-TR offers the highest inventory availability at 19491 pcs. This 8pF load capacitance variant is suitable when your circuit design accommodates 8pF load impedance. For direct 9pF equivalents, the ECS-260-9-47-CKM-TR provides 6826 pcs in stock.

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

A: Yes, all substitute parts use the 4-SMD, No Lead surface mount package. Footprint compatibility is maintained across all listed parts. The ABM12-115-26.000MHZ-T3 has a slightly larger footprint (1.65mm x 1.25mm versus 1.60mm x 1.20mm) but remains compatible with standard 1.6mm x 1.2mm land patterns with minimal tolerance margin.

Q: What is MSL 1 rating and why is it important?

A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited moisture sensitivity protection. Parts with this rating do not require special moisture control during storage, handling, or assembly. All listed substitute parts carry MSL 1 rating, ensuring consistent moisture protection across all options.

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