TC-57.849MBD-T MEMS Oscillator Equivalent & Substitute Parts

Part Overview

The TC-57.849MBD-T is a 57.849 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 surface mount package. The part is classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

TC-57.849MBD-T

TXC CORPORATIONIn Stock: 1037TC-57.849MBD-T Datasheet

Current PartRFQ

7X-57.849MBD-T

TXC CORPORATIONIn Stock: 7837X-57.849MBD-T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TC-57.849MBD-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 57.849 MHz (exact match required)
• Output Type: CMOS
• Supply Voltage: 3.3V
• Function: Enable/Disable capability
• Package Type: 4-SMD, No Lead
• Physical Dimensions: 3.20mm x 2.50mm footprint
• Operating Temperature Range: -40°C ~ 85°C minimum
• Frequency Stability: ±25ppm or better

Allowable Variations:

• Base Resonator Type: MEMS or Crystal resonator technology
• Current Supply (Max): Substitute may be lower than original
• Maximum Height: Substitute may be taller within PCB assembly constraints
• Product Status: Active status preferred for long-term availability

The 7X-57.849MBD-T meets all mandatory matching parameters and qualifies as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The 7X-57.849MBD-T is a qualified substitute for the obsolete TC-57.849MBD-T based on the following engineering criteria:

Electrical Compatibility: All critical electrical parameters match exactly, including frequency, output type, supply voltage, frequency stability, function, and operating temperature range. The substitute's lower maximum supply current (15mA versus 25mA) represents an improvement in power efficiency and does not create compatibility issues.

Mechanical Compatibility: Both parts share identical footprint dimensions (3.20mm x 2.50mm) and package type (4-SMD, No Lead), ensuring direct PCB layout compatibility. The substitute's increased maximum height (1.10mm versus 0.80mm) must be verified against PCB assembly clearance requirements and component stacking constraints.

Product Status and Compliance: The 7X-57.849MBD-T carries Active product status, ensuring long-term availability and supply chain continuity. The substitute is RoHS Compliant and REACH Unaffected, meeting current environmental and regulatory standards.

Resonator Technology Difference: The main part uses MEMS resonator technology while the substitute uses Crystal resonator technology. Both technologies deliver the specified frequency stability (±25ppm) and operating characteristics required for this application. This difference does not affect functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can the 7X-57.849MBD-T be used as a direct replacement for the TC-57.849MBD-T?

A: Yes. The 7X-57.849MBD-T meets all mandatory electrical and mechanical parameters. Both parts operate at 57.849 MHz with 3.3V CMOS output, Enable/Disable function, and identical footprint dimensions. Verify that the increased maximum height (1.10mm) does not exceed PCB assembly clearance limits.

Q: What is the difference between MEMS and Crystal resonator technology in these oscillators?

A: The TC-57.849MBD-T uses MEMS (Micro-Electro-Mechanical Systems) resonator technology, while the 7X-57.849MBD-T uses Crystal resonator technology. Both deliver identical frequency stability (±25ppm) and operating characteristics. The choice between technologies depends on application-specific requirements such as shock resistance, vibration tolerance, and environmental conditions. For this substitution, both technologies are functionally equivalent.

Q: Why does the substitute part draw less current (15mA versus 25mA)?

A: The 7X-57.849MBD-T's lower maximum supply current reflects improved circuit design efficiency. This reduction does not affect output performance or compatibility. Lower current consumption is beneficial for power-constrained applications and reduces thermal load on the power supply.

Q: Is the 0.30mm height difference significant?

A: The substitute's maximum height of 1.10mm (versus 0.80mm for the original) must be evaluated against specific PCB assembly constraints. Verify clearance above the component for solder reflow processes, component stacking, and enclosure fit. In most applications, this difference is accommodated within standard PCB design margins.

Q: What compliance certifications does the substitute part carry?

A: The 7X-57.849MBD-T is RoHS Compliant and REACH Unaffected. Both parts carry MSL 1 (Unlimited) moisture sensitivity rating and EAR99 export classification. The substitute meets current environmental and regulatory standards for electronic component procurement.

Q: Are there any inventory or lead time considerations?

A: The TC-57.849MBD-T (Obsolete) has 939 pieces in stock. The 7X-57.849MBD-T (Active) has 759 pieces in stock. For new designs or long-term production, the Active status of the substitute ensures continued availability and supply chain stability.