TC-44.000MBD-T Equivalent & Substitute Parts

Part Overview

The TC-44.000MBD-T is a 44 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 measuring 3.20mm x 2.50mm. The part is classified as Obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value
Frequency	44 MHz
Base Resonator Type	MEMS
Output Type	CMOS
Supply Voltage	3.3V
Frequency Stability	±25ppm
Operating Temperature Range	-40°C ~ 85°C
Function	Enable/Disable
Mounting Type	Surface Mount
Package / Case	4-SMD, No Lead
Size / Dimension	3.20mm x 2.50mm
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the TC-44.000MBD-T are classified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Frequency: 44 MHz (exact match required)
Output Type: CMOS (exact match required)
Supply Voltage: 3.3V nominal operation
Function: Enable/Disable capability
Operating Temperature Range: -40°C ~ 85°C (minimum requirement)
Frequency Stability: ±25ppm
Mounting Type: Surface Mount
Moisture Sensitivity Level: 1 (Unlimited)

Substitution Categories:

Direct Substitutes maintain identical electrical specifications and package footprint compatibility while differing in base resonator technology or manufacturer. These parts are pin-compatible and functionally equivalent.

Similar Substitutes provide equivalent electrical performance but differ in package configuration (pin count or height) or supply voltage range. These require PCB layout verification and may necessitate design modifications.

Parameter Comparison

Parameter	TC-44.000MBD-T (Main)	7X-44.000MBD-T (Direct)	ASE-44.000MHZ-LR-T (Direct)	ASEMPC-44.000MHZ-LR-T (Similar)
Manufacturer	TXC CORPORATION	TXC CORPORATION	Abracon LLC	Abracon LLC
Product Status	Obsolete	Active	Active	Active
Base Resonator	MEMS	Crystal	Crystal	MEMS
Frequency	44 MHz	44 MHz	44 MHz	44 MHz
Output Type	CMOS	CMOS	CMOS	CMOS
Supply Voltage	3.3V	3.3V	3.3V	2.25V ~ 3.6V
Frequency Stability	±25ppm	±25ppm	±25ppm	±25ppm
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Function	Enable/Disable	Enable/Disable	Enable/Disable	Enable/Disable
Current - Supply (Max)	25mA	15mA	19mA	35mA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead	6-SMD, No Lead
Size / Dimension	3.20mm x 2.50mm	3.20mm x 2.50mm	3.20mm x 2.50mm	3.20mm x 2.50mm
Height - Seated (Max)	0.80mm	1.10mm	1.20mm	0.90mm
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
RoHS Status	Not specified	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Substitution (Pin-Compatible, Footprint-Compatible):

The 7X-44.000MBD-T (TXC CORPORATION) is an active product offering direct substitution with identical electrical specifications and package footprint. This part features a crystal-based resonator instead of MEMS technology and operates at a reduced maximum supply current of 15mA compared to the original 25mA specification. The seated height increases from 0.80mm to 1.10mm, requiring verification of available PCB clearance. RoHS compliance is confirmed.

The ASE-44.000MHZ-LR-T (Abracon LLC) provides direct substitution with identical electrical specifications and package footprint. This crystal-based oscillator operates at 19mA maximum supply current and features a seated height of 1.20mm. ROHS3 compliance and REACH unaffected status are confirmed. Supply current in disable mode is specified at 10µA.

For Similar Substitution (Functional Equivalent, Package Modification Required):

The ASEMPC-44.000MHZ-LR-T (Abracon LLC) is a MEMS-based oscillator providing functional equivalence with extended supply voltage range (2.25V ~ 3.6V) and identical frequency stability. This part differs in package configuration (6-SMD versus 4-SMD) and seated height (0.90mm). Maximum supply current is 35mA with 26mA in disable mode. ROHS3 compliance and REACH unaffected status are confirmed. PCB layout modification is required due to package pin count difference.

Compliance and Status Considerations:

All substitute parts are classified as Active products with current manufacturer support. The 7X-44.000MBD-T and ASE-44.000MHZ-LR-T maintain identical package configurations and are recommended for direct replacement without design modification. The ASEMPC-44.000MHZ-LR-T requires PCB layout evaluation due to package differences but offers extended voltage range capability.

Frequently Asked Questions (FAQ)

Q: Can the 7X-44.000MBD-T be used as a direct replacement for the TC-44.000MBD-T?

A: Yes. The 7X-44.000MBD-T maintains identical electrical specifications (44 MHz, 3.3V, CMOS output, Enable/Disable function, ±25ppm stability) and package footprint (4-SMD, No Lead, 3.20mm x 2.50mm). The primary difference is resonator technology (crystal versus MEMS) and reduced maximum supply current (15mA versus 25mA). Seated height increases from 0.80mm to 1.10mm; verify available PCB clearance.

Q: What are the key differences between the ASE-44.000MHZ-LR-T and the original TC-44.000MBD-T?

A: Both parts operate at 44 MHz with 3.3V supply, CMOS output, and Enable/Disable function. The ASE-44.000MHZ-LR-T is a crystal-based oscillator with 19mA maximum supply current and 1.20mm seated height. The original TC-44.000MBD-T uses MEMS technology with 25mA maximum supply current and 0.80mm seated height. Package footprint is identical (4-SMD, No Lead, 3.20mm x 2.50mm).

Q: Is the ASEMPC-44.000MHZ-LR-T compatible with the TC-44.000MBD-T without PCB modification?

A: No. The ASEMPC-44.000MHZ-LR-T uses a 6-SMD package configuration compared to the 4-SMD package of the original part. PCB layout modification is required. However, this part provides functional equivalence with extended supply voltage range (2.25V ~ 3.6V) and identical frequency specifications.

Q: What is the impact of supply current differences between substitute parts?

A: The 7X-44.000MBD-T operates at 15mA maximum (reduced from 25mA), the ASE-44.000MHZ-LR-T at 19mA, and the ASEMPC-44.000MHZ-LR-T at 35mA. These differences affect power consumption and thermal management. Designs with tight power budgets benefit from the 7X-44.000MBD-T. Designs requiring lower disable-mode current benefit from the ASE-44.000MHZ-LR-T (10µA specified).

Q: Are all substitute parts RoHS compliant?

A: The 7X-44.000MBD-T is RoHS Compliant. The ASE-44.000MHZ-LR-T and ASEMPC-44.000MHZ-LR-T are ROHS3 Compliant. All parts are REACH Unaffected. The original TC-44.000MBD-T does not specify RoHS status.

Q: What is the significance of seated height differences?

A: The original TC-44.000MBD-T has a maximum seated height of 0.80mm. The 7X-44.000MBD-T measures 1.10mm, the ASE-44.000MHZ-LR-T measures 1.20mm, and the ASEMPC-44.000MHZ-LR-T measures 0.90mm. Height differences affect available PCB clearance for adjacent components. Verify clearance requirements before substitution.

Q: Can the extended voltage range of the ASEMPC-44.000MHZ-LR-T (2.25V ~ 3.6V) be utilized in a 3.3V design?

A: Yes. The ASEMPC-44.000MHZ-LR-T operates within the 2.25V ~ 3.6V range and is compatible with 3.3V supply designs. The extended range provides additional flexibility for applications with variable supply voltages but does not alter operation at fixed 3.3V supplies.

Q: What is the Moisture Sensitivity Level (MSL) for all parts?

A: All parts, including the original TC-44.000MBD-T and all substitute options, are classified as MSL 1 (Unlimited). This indicates unlimited shelf life without moisture control requirements.

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