TC-70.000MBD-T MEMS Oscillator Equivalent & Substitute Parts

Part Overview

The TC-70.000MBD-T is a 70 MHz MEMS-based XO (Standard) oscillator manufactured by TXC CORPORATION. This component operates at 3.3V with CMOS output, Enable/Disable functionality, and is housed in a 4-SMD, No Lead package. The part is classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Key Parameters

Parameter	Value
Frequency	70 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
Package Dimensions	3.20mm x 2.50mm
Mounting Type	Surface Mount
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TC-70.000MBD-T is determined by the following critical parameters:

Mandatory Matching Parameters:

Frequency: 70 MHz (exact match required)
Output Type: CMOS
Supply Voltage: 3.3V
Function: Enable/Disable capability
Package Type: 4-SMD, No Lead
Package Dimensions: 3.20mm x 2.50mm
Operating Temperature Range: -40°C ~ 85°C
Frequency Stability: ±25ppm

Allowable Variations:

Base Resonator Technology: MEMS or Crystal resonator designs are functionally interchangeable when all electrical parameters match
Current Supply (Max): Substitute parts with lower maximum supply current are acceptable
Product Status: Active status parts are preferred for long-term availability
Compliance Certifications: RoHS and REACH compliance enhance suitability but do not disqualify parts meeting electrical specifications

The 7X-70.000MBD-T qualifies as a direct substitute based on matching all mandatory parameters while offering improved product status and reduced power consumption.

Parameter Comparison

Parameter	TC-70.000MBD-T (Main Part)	7X-70.000MBD-T (Substitute)
Manufacturer	TXC CORPORATION	TXC CORPORATION
Base Resonator	MEMS	Crystal
Type	XO (Standard)	XO (Standard)
Frequency	70 MHz	70 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)	30mA	15mA
Mounting Type	Surface Mount	Surface Mount
Package / Case	4-SMD, No Lead	4-SMD, No Lead
Size / Dimension	3.20mm x 2.50mm	3.20mm x 2.50mm
Height - Seated (Max)	0.80mm	1.10mm
Product Status	Obsolete	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	RoHS Compliant
REACH Status	Not specified	REACH Unaffected

Engineering Selection Recommendations

The 7X-70.000MBD-T is a qualified substitute for the TC-70.000MBD-T based on the following engineering criteria:

Electrical Compatibility: All critical electrical parameters match exactly, including frequency (70 MHz), output type (CMOS), supply voltage (3.3V), function (Enable/Disable), frequency stability (±25ppm), and operating temperature range (-40°C ~ 85°C).

Package Compatibility: Both parts use identical 4-SMD, No Lead packaging with matching footprint dimensions (3.20mm x 2.50mm). The 7X-70.000MBD-T has a maximum seated height of 1.10mm compared to 0.80mm for the TC-70.000MBD-T. This 0.30mm height difference must be evaluated against PCB assembly clearance requirements.

Power Consumption Advantage: The 7X-70.000MBD-T operates at a maximum supply current of 15mA, compared to 30mA for the TC-70.000MBD-T, representing a 50% reduction in power consumption.

Product Status and Compliance: The 7X-70.000MBD-T holds Active product status, ensuring long-term availability and supply chain continuity. RoHS Compliance and REACH Unaffected status provide regulatory alignment for applications subject to environmental compliance requirements.

Resonator Technology Difference: The TC-70.000MBD-T uses MEMS resonator technology while the 7X-70.000MBD-T uses Crystal resonator technology. Both technologies deliver identical electrical performance within the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can the 7X-70.000MBD-T directly replace the TC-70.000MBD-T without PCB modifications?

A: Direct replacement is possible if PCB assembly clearance accommodates the 1.10mm maximum seated height of the 7X-70.000MBD-T. The footprint dimensions are identical (3.20mm x 2.50mm). No electrical modifications are required.

Q: What is the significance of the MEMS versus Crystal resonator difference?

A: Both MEMS and Crystal resonators deliver identical electrical performance for this application. The resonator technology does not affect frequency, stability, output type, or operating characteristics when specifications match.

Q: Why does the 7X-70.000MBD-T consume half the current of the TC-70.000MBD-T?

A: The difference in maximum supply current (15mA versus 30mA) reflects design optimization in the 7X series. Both parts meet the ±25ppm frequency stability requirement and operate identically within specified parameters.

Q: Is the 7X-70.000MBD-T suitable for applications requiring RoHS compliance?

A: Yes. The 7X-70.000MBD-T is RoHS Compliant and REACH Unaffected, meeting environmental regulatory requirements for applications subject to these standards.

Q: Are there any frequency or timing differences between these parts?

A: No. Both parts operate at 70 MHz with ±25ppm frequency stability across the -40°C ~ 85°C operating temperature range.

Q: What is the impact of the 0.30mm height difference on assembly?

A: The 7X-70.000MBD-T maximum seated height of 1.10mm is 0.30mm taller than the TC-70.000MBD-T (0.80mm). Verify PCB assembly clearance, component placement density, and any height-sensitive applications before implementation.

Q: Can the Enable/Disable function be used identically on both parts?

A: Yes. Both parts provide Enable/Disable functionality with identical electrical behavior and pin configuration.

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