TD-26.000MBD-T MEMS Oscillator Equivalent & Substitute Parts

Part Overview

The TD-26.000MBD-T is a 26 MHz MEMS-based XO (Standard) oscillator manufactured by TXC CORPORATION. This component operates at 3.3V with CMOS output, Enable/Disable function, and is housed in a 4-SMD, No Lead package. The part is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement continuity.

Substiute Parts

TD-26.000MBD-T

TXC CORPORATIONIn Stock: 1110TD-26.000MBD-T Datasheet

Current PartRFQ

8W-26.000MBD-T

TXC CORPORATIONIn Stock: 7948W-26.000MBD-T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TD-26.000MBD-T is determined by the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 26 MHz
• Output Type: CMOS
• Supply Voltage: 3.3V
• Function: Enable/Disable
• Package Type: 4-SMD, No Lead
• Package Dimensions: 2.50mm x 2.00mm
• Operating Temperature Range: -40°C ~ 85°C
• Frequency Stability: ±25ppm

Allowable Variations:

• Base Resonator Type: MEMS or Crystal technologies are functionally equivalent at the system level
• Current Supply (Max): Variations acceptable if within system power budget constraints
• Maximum Height: Minor variations acceptable if within PCB assembly clearance specifications
• Product Status: Active status preferred for long-term availability

The 8W-26.000MBD-T qualifies as a direct substitute based on matching all mandatory parameters while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 8W-26.000MBD-T

The 8W-26.000MBD-T is the qualified substitute for the obsolete TD-26.000MBD-T. Selection rationale:

1. Product Status: The 8W series maintains Active status, ensuring long-term availability and manufacturing support compared to the Obsolete TD series.

2. Functional Equivalence: All critical electrical parameters match exactly: 26 MHz frequency, 3.3V supply, CMOS output, Enable/Disable function, and ±25ppm frequency stability.

3. Package Compatibility: Identical 4-SMD, No Lead package with matching 2.50mm x 2.00mm footprint enables direct PCB layout reuse without redesign.

4. Compliance Certifications: The 8W-26.000MBD-T carries ROHS3 Compliant and REACH Unaffected certifications, meeting modern regulatory requirements.

5. Power Efficiency: The 8W variant operates at 15mA maximum supply current versus 25mA for the TD variant, providing improved power efficiency in battery-powered or power-constrained applications.

6. Height Consideration: The 8W variant has a maximum seated height of 0.90mm compared to 0.80mm for the TD variant. This 0.10mm difference is negligible for standard PCB assembly processes and does not impact component placement or clearance in typical applications.

Frequently Asked Questions (FAQ)

Q: Can the 8W-26.000MBD-T be used as a direct replacement for the TD-26.000MBD-T without circuit modifications?

A: Yes. Both parts share identical electrical specifications (26 MHz, 3.3V, CMOS output, Enable/Disable function) and package footprint (4-SMD, No Lead, 2.50mm x 2.00mm). No circuit modifications are required for functional substitution.

Q: What is the difference between MEMS and Crystal base resonators in these oscillators?

A: The TD-26.000MBD-T uses MEMS technology while the 8W-26.000MBD-T uses Crystal technology. Both deliver identical frequency stability (±25ppm), operating temperature range (-40°C ~ 85°C), and output characteristics. The resonator technology difference does not affect system-level performance when electrical specifications match.

Q: Is the 0.10mm height difference between the two parts significant?

A: No. The TD-26.000MBD-T has a maximum seated height of 0.80mm while the 8W-26.000MBD-T measures 0.90mm. This 0.10mm variation is within standard PCB assembly tolerances and does not impact component placement, solder reflow, or clearance in typical applications.

Q: Why does the 8W-26.000MBD-T consume less current (15mA vs 25mA)?

A: The difference in maximum supply current reflects the different resonator technologies and internal circuit designs. Both parts meet the same frequency stability and output specifications. The lower current consumption of the 8W variant provides a system-level advantage in power-constrained applications.

Q: Are there any compliance or certification differences between the two parts?

A: The 8W-26.000MBD-T carries ROHS3 Compliant and REACH Unaffected certifications. The TD-26.000MBD-T specifications do not include these certifications. Both parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. The 8W variant is preferred for applications requiring modern environmental compliance documentation.

Q: What is the Moisture Sensitivity Level (MSL) for these oscillators?

A: Both the TD-26.000MBD-T and 8W-26.000MBD-T are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. These parts do not require special moisture control during storage, handling, or assembly.

Q: Can I use the 8W-26.000MBD-T in designs originally specified for the TD-26.000MBD-T?

A: Yes. The 8W-26.000MBD-T is a qualified substitute for the TD-26.000MBD-T. Identical electrical performance, package footprint, and operating specifications support direct design reuse without modifications.