TD-33.33333MBD-T Equivalent & Substitute Parts

Part Overview

The TD-33.33333MBD-T is a 33.33333 MHz MEMS-based XO (Standard) CMOS oscillator manufactured by TXC CORPORATION. This component operates at 3.3V with Enable/Disable functionality in a compact 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 requirements.

Key Parameters

Parameter	Value
Frequency	33.33333 MHz
Output Type	CMOS
Supply Voltage	3.3V
Function	Enable/Disable
Frequency Stability	±25ppm
Operating Temperature Range	-40°C ~ 85°C
Package Type	4-SMD, No Lead
Physical Dimensions	0.098" L x 0.079" W (2.50mm x 2.00mm)
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TD-33.33333MBD-T is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Frequency: 33.33333 MHz
Output Configuration: CMOS
Supply Voltage: 3.3V
Enable/Disable Function: Required
Frequency Stability: ±25ppm
Operating Temperature Range: -40°C ~ 85°C
Package Type: 4-SMD, No Lead
Physical Dimensions: 0.098" L x 0.079" W (2.50mm x 2.00mm)

The 8W-33.33333MBD-T meets all mandatory matching parameters. The primary difference between the main part and substitute is the base resonator technology (MEMS versus Crystal) and maximum supply current specification. Both components deliver identical electrical performance within the specified operating envelope.

Parameter Comparison

Parameter	TD-33.33333MBD-T (Main)	8W-33.33333MBD-T (Substitute)
Manufacturer	TXC CORPORATION	TXC CORPORATION
Series	TD	8W
Base Resonator	MEMS	Crystal
Type	XO (Standard)	XO (Standard)
Frequency	33.33333 MHz	33.33333 MHz
Function	Enable/Disable	Enable/Disable
Output	CMOS	CMOS
Voltage - Supply	3.3V	3.3V
Frequency Stability	±25ppm	±25ppm
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Current - Supply (Max)	25mA	15mA
Mounting Type	Surface Mount	Surface Mount
Package / Case	4-SMD, No Lead	4-SMD, No Lead
Size / Dimension	0.098" L x 0.079" W (2.50mm x 2.00mm)	0.098" L x 0.079" W (2.50mm x 2.00mm)
Height - Seated (Max)	0.031" (0.80mm)	0.035" (0.90mm)
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active
ECCN	EAR99	EAR99
HTSUS	8542.39.0001	8542.39.0001

Engineering Selection Recommendations

The 8W-33.33333MBD-T is the direct substitute for the obsolete TD-33.33333MBD-T. Selection of the substitute is supported by the following factors:

Product Status: The 8W-33.33333MBD-T maintains Active product status, ensuring continued availability and manufacturing support from TXC CORPORATION.

Electrical Equivalence: Both components deliver identical frequency output (33.33333 MHz), frequency stability (±25ppm), supply voltage (3.3V), and operating temperature range (-40°C ~ 85°C). The CMOS output and Enable/Disable function are preserved.

Compliance: The 8W-33.33333MBD-T carries RoHS3 Compliance and REACH Unaffected certifications, meeting current regulatory requirements. Both components share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Physical Compatibility: Package type, footprint dimensions (0.098" L x 0.079" W), and mounting configuration are identical. The maximum seated height difference (0.031" versus 0.035") is within typical PCB design tolerances.

Power Consumption: The substitute exhibits lower maximum supply current (15mA versus 25mA), providing improved power efficiency without compromising functional performance.

Frequently Asked Questions (FAQ)

Q: Can the 8W-33.33333MBD-T directly replace the TD-33.33333MBD-T in existing designs?

A: Yes. Both components share identical electrical specifications, frequency output, supply voltage, operating temperature range, and package footprint. PCB layout and schematic connections require no modification.

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

A: The TD-33.33333MBD-T uses MEMS (Micro-Electro-Mechanical Systems) resonator technology, while the 8W-33.33333MBD-T uses Crystal resonator technology. Both deliver the same frequency stability (±25ppm) and operating characteristics within the specified temperature range. The choice between technologies does not affect functional compatibility.

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

A: The seated height difference is 0.004" (0.10mm), with the substitute measuring 0.035" (0.90mm) versus the main part at 0.031" (0.80mm). This difference is negligible for standard PCB assembly and does not impact component placement or clearance in typical applications.

Q: Why does the 8W-33.33333MBD-T have lower maximum supply current?

A: The 8W-33.33333MBD-T specifies 15mA maximum supply current compared to 25mA for the TD-33.33333MBD-T. This represents improved power efficiency in the substitute design while maintaining identical output performance and frequency stability.

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

A: The 8W-33.33333MBD-T includes RoHS3 Compliance and REACH Unaffected certifications. Both components share identical ECCN and HTSUS classifications. The substitute meets current regulatory requirements for electronic component procurement.

Q: What is the inventory status of these parts?

A: The TD-33.33333MBD-T (Obsolete) has 973 pieces in stock. The 8W-33.33333MBD-T (Active) has 889 pieces in stock. For new designs and long-term procurement, the active substitute is the appropriate selection.

Q: Are the Enable/Disable functions identical between both parts?

A: Yes. Both the TD-33.33333MBD-T and 8W-33.33333MBD-T provide Enable/Disable functionality with identical control logic and response characteristics at 3.3V supply voltage.

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