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7M-26.000MEEC-T Equivalent & Substitute Parts
Part Overview
The 7M-26.000MEEC-T is a 26 MHz fundamental mode crystal oscillator manufactured by TXC CORPORATION. This surface mount device operates at ±10ppm frequency stability with a 9pF load capacitance and 60 Ohms equivalent series resistance (ESR). The part is housed in a 4-SMD, No Lead package measuring 3.20mm x 2.50mm with a maximum seated height of 0.80mm. The device is RoHS Compliant with Moisture Sensitivity Level 1 (Unlimited) and maintains Active product status. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be achieved within the specified parameter tolerances.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Frequency | 26.0000 | MHz |
| Frequency Stability | ±10 | ppm |
| Load Capacitance | 9 | 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 (Moisture Sensitivity Level) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the 7M-26.000MEEC-T is determined by the following critical parameters:
Primary Substitution Criteria:
- Frequency: 26.0000 MHz (exact match required)
- Frequency Stability: ±10ppm (exact match required)
- Operating Mode: Fundamental (exact match required)
- Operating Temperature Range: -20°C to 70°C (exact match required)
- Mounting Type: Surface Mount (exact match required)
- Package / Case: 4-SMD, No Lead (exact match required)
Secondary Compatibility Parameters:
- Load Capacitance: 9pF (primary specification; 10pF variants acceptable with circuit design verification)
- ESR: 60 Ohms (primary specification; variations acceptable within circuit tolerance)
- Size / Dimension: 3.20mm x 2.50mm (preferred for PCB layout consistency)
- Height - Seated: 0.80mm maximum (preferred for assembly clearance)
Substitute parts are grouped based on load capacitance and ESR variations. Parts with identical load capacitance (9pF) and ESR (60 Ohms) are direct equivalents. Parts with 10pF load capacitance or different ESR values are conditional substitutes requiring circuit-level verification of oscillator design parameters.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Frequency (MHz) | Frequency Stability (ppm) | Load Capacitance (pF) | ESR (Ohms) | Package | Size (mm) | Height Max (mm) | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| 7M-26.000MEEC-T | TXC CORPORATION | 26.0000 | ±10 | 9 | 60 | 4-SMD, No Lead | 3.20 x 2.50 | 0.80 | RoHS Compliant |
| 7M-26.000MEEQ-T | TXC CORPORATION | 26.0000 | ±10 | 10 | 60 | 4-SMD, No Lead | 3.20 x 2.50 | 0.80 | RoHS Compliant |
| 8Z-26.000MEEQ-T | TXC CORPORATION | 26.0000 | ±10 | 10 | 100 | 4-SMD, No Lead | 2.50 x 2.00 | 0.55 | RoHS Compliant |
| 403C11A26M00000 | CTS-Frequency Controls | 26.0000 | ±10 | 10 | 60 | 4-SMD, No Lead | 3.20 x 2.50 | 0.80 | ROHS3 Compliant |
| ABM10W-26.0000MHZ-7-B1U-T3 | Abracon LLC | 26.0000 | ±10 | 7 | 50 | 4-SMD, No Lead | 2.50 x 2.00 | 0.60 | ROHS3 Compliant |
| ABM10W-26.0000MHZ-8-B1U-T3 | Abracon LLC | 26.0000 | ±10 | 8 | 50 | 4-SMD, No Lead | 2.50 x 2.00 | 0.60 | ROHS3 Compliant |
| ABM11-26.000MHZ-B1U-T | Abracon LLC | 26.0000 | ±10 | 10 | 100 | 4-SMD, No Lead | 2.00 x 1.60 | 0.59 | ROHS3 Compliant |
| ABM12-115-26.000MHZ-T3 | Abracon LLC | 26.0000 | ±10 | 8 | 100 | 4-SMD, No Lead | 1.65 x 1.25 | 0.40 | ROHS3 Compliant |
| CS00445-26M | NDK America, Inc. | 26.0000 | ±10 | 10 | 100 | 4-SMD, No Lead | 2.50 x 2.00 | 0.65 | RoHS Compliant |
| CS00468-26M | NDK America, Inc. | 26.0000 | ±10 | 10 | 50 | 4-SMD, No Lead | 3.20 x 2.50 | 0.70 | ROHS3 Compliant |
| CS00546-26M | NDK America, Inc. | 26.0000 | ±10 | 10 | 50 | 4-SMD, No Lead | 3.20 x 2.50 | 0.70 | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalents (Identical Load Capacitance and ESR):
The 7M-26.000MEEQ-T (TXC CORPORATION) and 403C11A26M00000 (CTS-Frequency Controls) are direct functional equivalents with 10pF load capacitance and 60 Ohms ESR. Both maintain identical frequency, stability, operating temperature range, and package specifications. The 403C11A26M00000 carries ROHS3 Compliant certification compared to RoHS Compliant for the 7M-26.000MEEQ-T. Both are suitable for direct substitution when the circuit design accommodates 10pF load capacitance.
Conditional Substitutes (Load Capacitance Variation):
The CS00468-26M and CS00546-26M (NDK America, Inc.) feature 10pF load capacitance with 50 Ohms ESR and maintain the original 3.20mm x 2.50mm footprint. These parts are substitutable when circuit oscillator design parameters accommodate the reduced ESR value. Both carry ROHS3 Compliant certification.
Conditional Substitutes (ESR Variation):
The 8Z-26.000MEEQ-T (TXC CORPORATION), ABM11-26.000MHZ-B1U-T (Abracon LLC), and CS00445-26M (NDK America, Inc.) feature 100 Ohms ESR with 10pF load capacitance. These parts are substitutable when circuit design tolerates increased ESR. The 8Z-26.000MEEQ-T and ABM11-26.000MHZ-B1U-T employ reduced package dimensions (2.50mm x 2.00mm and 2.00mm x 1.60mm respectively), requiring PCB layout verification.
Conditional Substitutes (Load Capacitance and ESR Variation):
The ABM10W-26.0000MHZ-7-B1U-T3 and ABM10W-26.0000MHZ-8-B1U-T3 (Abracon LLC) feature 7pF and 8pF load capacitance respectively with 50 Ohms ESR. The ABM12-115-26.000MHZ-T3 (Abracon LLC) features 8pF load capacitance with 100 Ohms ESR. These parts employ reduced package dimensions and require comprehensive circuit design verification for oscillator startup and frequency stability.
Compliance Considerations:
All substitute parts maintain Active product status. TXC CORPORATION and CTS-Frequency Controls parts carry standard RoHS or ROHS3 compliance. Abracon LLC and NDK America, Inc. parts carry ROHS3 Compliant certification. All parts are REACH Unaffected and classified as EAR99 for export control purposes.
Frequently Asked Questions (FAQ)
Q: Can the 7M-26.000MEEQ-T replace the 7M-26.000MEEC-T directly?
A: The 7M-26.000MEEQ-T differs in load capacitance (10pF versus 9pF) and maintains identical ESR (60 Ohms). Direct substitution is possible when the oscillator circuit design accommodates 10pF load capacitance. Verify circuit design parameters before implementation.
Q: What is the significance of ESR variation in crystal substitution?
A: Equivalent Series Resistance (ESR) affects oscillator startup behavior and power consumption. The 7M-26.000MEEC-T specifies 60 Ohms ESR. Substitutes with 50 Ohms ESR (lower) or 100 Ohms ESR (higher) require verification that the oscillator circuit design maintains stable operation within the specified frequency tolerance and startup margin.
Q: Are the smaller package alternatives (ABM12-115-26.000MHZ-T3, ABM11-26.000MHZ-B1U-T) suitable replacements?
A: These parts maintain identical frequency, stability, and operating temperature specifications but employ reduced package dimensions (1.65mm x 1.25mm and 2.00mm x 1.60mm respectively). Substitution requires PCB layout verification for component placement, trace routing, and assembly clearance. Load capacitance and ESR variations also require circuit design verification.
Q: What is the difference between RoHS Compliant and ROHS3 Compliant?
A: Both certifications indicate compliance with Restriction of Hazardous Substances regulations. ROHS3 represents the current revision of the directive. Both are acceptable for applications requiring RoHS compliance. Verify specific customer or regional requirements.
Q: Can I substitute a 50 Ohms ESR crystal for the 60 Ohms specification?
A: Substitution is possible when the oscillator circuit design accommodates the lower ESR value. Lower ESR reduces startup time and power consumption but may affect frequency stability if the circuit design is optimized for the original 60 Ohms specification. Perform circuit simulation or prototype testing to verify performance.
Q: Are NDK America, Inc. parts (CS00468-26M, CS00546-26M) interchangeable?
A: The CS00468-26M and CS00546-26M are functionally identical with 26 MHz frequency, ±10ppm stability, 10pF load capacitance, and 50 Ohms ESR. Both maintain the 3.20mm x 2.50mm footprint. These parts are interchangeable for direct substitution.
Q: What load capacitance value should I select for new designs?
A: Load capacitance selection depends on oscillator circuit design. The 7M-26.000MEEC-T specifies 9pF. Alternatives with 10pF, 8pF, or 7pF load capacitance are available. Consult oscillator IC datasheets and circuit design guidelines to determine the appropriate load capacitance for your specific application.
Q: Do all substitute parts maintain the same operating temperature range?
A: All listed substitute parts maintain the -20°C to 70°C operating temperature range specified for the 7M-26.000MEEC-T. Verify specific application temperature requirements against this range.
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