TC-74.250MBD-T MEMS Oscillator Equivalent & Substitute Parts

Part Overview

The TC-74.250MBD-T is a 74.25 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 compatible substitute components essential for ongoing system support and procurement.

Substiute Parts

TC-74.250MBD-T

TXC CORPORATIONIn Stock: 1161TC-74.250MBD-T Datasheet

Current PartRFQ

7X-74.250MBD-T

TXC CORPORATIONIn Stock: 9007X-74.250MBD-T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TC-74.250MBD-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 74.25 MHz (exact match required)
• Output Type: CMOS
• Supply Voltage: 3.3V
• Function: Enable/Disable capability
• Frequency Stability: ±25ppm
• Operating Temperature Range: -40°C ~ 85°C
• Package Type: 4-SMD, No Lead
• Package Dimensions: 3.20mm x 2.50mm

The 7X-74.250MBD-T qualifies as a direct substitute based on identical performance across all mandatory parameters. The primary difference is the base resonator technology (Crystal vs. MEMS) and product status (Active vs. Obsolete).

Parameter Comparison

Engineering Selection Recommendations

The 7X-74.250MBD-T is a direct functional equivalent to the TC-74.250MBD-T. Selection between these parts is based on the following engineering considerations:

Product Status: The TC-74.250MBD-T is Obsolete, while the 7X-74.250MBD-T is Active. For new designs or long-term procurement, the 7X-74.250MBD-T is the appropriate selection due to ongoing manufacturer support and availability.

Compliance: The 7X-74.250MBD-T carries RoHS Compliant certification, whereas the TC-74.250MBD-T does not specify RoHS status. Both parts are classified as EAR99 and share identical HTSUS codes.

Power Consumption: The 7X-74.250MBD-T operates at a maximum supply current of 15mA, compared to 30mA for the TC-74.250MBD-T. This represents a 50% reduction in power consumption, providing a secondary benefit for power-sensitive applications.

Physical Height: The 7X-74.250MBD-T has a seated height of 1.10mm versus 0.80mm for the TC-74.250MBD-T. PCB layout and clearance constraints must be evaluated for space-critical applications.

Frequently Asked Questions (FAQ)

Q: Can the 7X-74.250MBD-T directly replace the TC-74.250MBD-T in existing designs?

A: Yes. Both parts share identical frequency (74.25 MHz), output type (CMOS), supply voltage (3.3V), function (Enable/Disable), frequency stability (±25ppm), operating temperature range (-40°C ~ 85°C), and package dimensions (3.20mm x 2.50mm). The 4-SMD, No Lead package footprint is identical, allowing direct PCB substitution.

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

A: The TC-74.250MBD-T uses MEMS technology, while the 7X-74.250MBD-T uses Crystal technology. Both deliver identical electrical performance within the specified parameters. The MEMS variant (TC series) is Obsolete; the Crystal variant (7X series) is Active and currently manufactured.

Q: Does the height difference between the two parts affect PCB assembly?

A: The 7X-74.250MBD-T has a maximum seated height of 1.10mm compared to 0.80mm for the TC-74.250MBD-T. This 0.30mm difference must be evaluated against PCB clearance requirements, component stacking, and enclosure constraints. For most applications, this difference is not critical; however, space-constrained designs require verification.

Q: Is the 7X-74.250MBD-T suitable for RoHS-compliant applications?

A: Yes. The 7X-74.250MBD-T is RoHS Compliant. The TC-74.250MBD-T does not specify RoHS status. For applications requiring RoHS compliance, the 7X-74.250MBD-T is the appropriate selection.

Q: What is the impact of the 15mA versus 30mA supply current difference?

A: The 7X-74.250MBD-T operates at 15mA maximum supply current, half that of the TC-74.250MBD-T at 30mA. This reduction in power consumption benefits battery-powered and thermally constrained applications. Power supply and thermal design calculations should be updated accordingly when substituting.

Q: Are both parts classified under the same export control and tariff codes?

A: Yes. Both the TC-74.250MBD-T and 7X-74.250MBD-T share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, simplifying export documentation and tariff compliance.