TC-33.000MBD-T Equivalent & Substitute Parts

Part Overview

The TC-33.000MBD-T is a 33 MHz MEMS-based XO (Standard) CMOS oscillator manufactured by TXC CORPORATION. This component operates at 3.3V with Enable/Disable functionality in a 4-SMD, No Lead surface mount package. The part is classified as Obsolete, necessitating identification of equivalent substitute components that maintain functional and mechanical compatibility for ongoing production and repair applications.

Substiute Parts

TC-33.000MBD-T

TXC CORPORATIONIn Stock: 3851TC-33.000MBD-T Datasheet

Current PartRFQ

7X-33.000MBD-T

TXC CORPORATIONIn Stock: 10567X-33.000MBD-T Datasheet

DirectRFQ

ASE-33.000MHZ-L-R-T

Abracon LLCIn Stock: 749ASE-33.000MHZ-L-R-T Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TC-33.000MBD-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 33 MHz
• Output Type: CMOS
• Supply Voltage: 3.3V
• Function: Enable/Disable
• Frequency Stability: ±25ppm
• Operating Temperature Range: -40°C ~ 85°C
• Package / Case: 4-SMD, No Lead
• Physical Dimensions: 0.126" L x 0.098" W (3.20mm x 2.50mm)
• Mounting Type: Surface Mount
• Moisture Sensitivity Level: 1 (Unlimited)

Both identified substitute parts meet all mandatory matching parameters. Differences exist in base resonator technology (MEMS versus Crystal), current consumption specifications, and product status, which are documented in the parameter comparison table below.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 7X-33.000MBD-T

The 7X-33.000MBD-T is the preferred substitute for the obsolete TC-33.000MBD-T. Both components are manufactured by TXC CORPORATION and share identical electrical specifications and physical dimensions. The 7X series maintains Active product status, ensuring long-term availability and supply chain continuity. The 7X-33.000MBD-T exhibits lower maximum supply current (15mA versus 25mA), providing improved power efficiency. RoHS Compliance certification is provided for the 7X variant, supporting regulatory requirements in modern manufacturing environments.

Secondary Substitute: ASE-33.000MHZ-L-R-T

The ASE-33.000MHZ-L-R-T manufactured by Abracon LLC serves as an alternative substitute when TXC CORPORATION components are unavailable. This component maintains all mandatory electrical and mechanical parameters. The ASE variant demonstrates the lowest maximum supply current (13mA) and includes specified disable-mode current consumption (10µA), enabling precise power budget calculations for applications with extended low-power operation requirements. ROHS3 Compliance and REACH Unaffected certifications are provided.

Height Consideration:

The main part TC-33.000MBD-T has a maximum seated height of 0.031" (0.80mm). Both substitute parts exceed this dimension: 7X-33.000MBD-T at 0.043" (1.10mm) and ASE-33.000MHZ-L-R-T at 0.047" (1.20mm). Applications with height-constrained PCB layouts require clearance verification before substitution.

Frequently Asked Questions (FAQ)

Q: Can the 7X-33.000MBD-T directly replace the TC-33.000MBD-T without circuit modification?

A: Yes. Both components share identical electrical specifications (frequency, output type, supply voltage, function, frequency stability, and operating temperature range) and physical footprint dimensions (0.126" L x 0.098" W). No circuit modification is required. However, the increased seated height (1.10mm versus 0.80mm) must be verified against PCB clearance constraints.

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

A: The TC-33.000MBD-T uses MEMS (Micro-Electro-Mechanical Systems) technology, while the 7X-33.000MBD-T and ASE-33.000MHZ-L-R-T use Crystal resonators. Both technologies deliver the specified ±25ppm frequency stability and identical electrical performance. MEMS oscillators typically offer improved shock and vibration resistance, while crystal-based oscillators are established technology with extensive field history.

Q: Why do the substitute parts have lower maximum supply current specifications?

A: The 7X-33.000MBD-T (15mA max) and ASE-33.000MHZ-L-R-T (13mA max) represent improved power efficiency compared to the TC-33.000MBD-T (25mA max). Lower current consumption reduces thermal dissipation and power supply requirements. Applications designed for the original 25mA specification will operate within acceptable margins with these lower-current substitutes.

Q: Is the increased height of substitute parts a concern for all applications?

A: Height becomes a concern only in space-constrained designs. The TC-33.000MBD-T seated height is 0.80mm, while substitutes measure 1.10mm (7X series) and 1.20mm (ASE series). Verify clearance above the component location on the PCB. Most standard PCB designs accommodate this height difference without modification.

Q: What compliance certifications should I prioritize for new designs?

A: Both active substitute parts provide RoHS compliance (7X-33.000MBD-T: RoHS Compliant; ASE-33.000MHZ-L-R-T: ROHS3 Compliant) and REACH Unaffected status. For applications requiring regulatory compliance in electronics manufacturing, either substitute meets current environmental standards. The ASE variant provides ROHS3 certification, representing the most current compliance level.

Q: Can I use the ASE-33.000MHZ-L-R-T in applications requiring disable-mode current specifications?

A: Yes. The ASE-33.000MHZ-L-R-T specifies maximum disable-mode current at 10µA, enabling precise power consumption calculations for low-power or battery-operated applications. The TC-33.000MBD-T and 7X-33.000MBD-T do not provide disable-mode current specifications, making the ASE variant preferable when this parameter is critical to system design.

Q: Are there packaging differences between the main part and substitutes?

A: Yes. The TC-33.000MBD-T is supplied in Cut Tape (CT) & Digi-Reel® packaging, while both substitutes use standard Tape & Reel (TR) packaging. Tape & Reel is the industry standard for automated assembly processes. If Cut Tape packaging is specifically required, contact the manufacturer regarding availability options.