TA-18.432MBD-T MEMS Oscillator Equivalent & Substitute Parts

Part Overview

The TA-18.432MBD-T is an 18.432 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 package measuring 7.00mm x 5.00mm. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Frequency	18.432 MHz
Base Resonator Type	MEMS
Output Type	CMOS
Supply Voltage	3.3V
Function	Enable/Disable
Frequency Stability	±25ppm
Operating Temperature Range	-40°C ~ 85°C
Maximum Supply Current	25mA
Package Type	4-SMD, No Lead
Package Dimensions	7.00mm x 5.00mm
Maximum Seated Height	1.00mm
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the TA-18.432MBD-T is determined by the following critical parameters:

Mandatory Matching Parameters:

Frequency: 18.432 MHz
Output Type: CMOS
Supply Voltage: 3.3V (or compatible range including 3.3V)
Function: Enable/Disable
Operating Temperature Range: -40°C ~ 85°C minimum
Moisture Sensitivity Level: MSL 1

Compatible Package Criteria:

Surface Mount technology
Footprint compatibility with 7.00mm x 5.00mm dimensions
Package configurations: 4-SMD No Lead or 6-SMD No Lead with Exposed Pad

Substitution Categories:

Direct Substitutes (Electrical & Mechanical Compatibility): Parts meeting all mandatory parameters with identical or compatible package specifications and equivalent electrical performance.

Similar Substitutes (Functional Equivalence with Design Considerations): Parts meeting all mandatory parameters but with different base resonator technology (Crystal vs. MEMS) or package pin count, requiring PCB layout verification.

Parameter Comparison

Parameter	TA-18.432MBD-T (Main)	510CBA18M4320AAGR	CPPLC7L-A7BR-18.432TS	ASVMPC-18.432MHZ-LR-T
Manufacturer	TXC CORPORATION	Skyworks Solutions Inc.	Cardinal Components Inc.	Abracon LLC
Frequency	18.432 MHz	18.432 MHz	18.432 MHz	18.432 MHz
Base Resonator	MEMS	Crystal	Crystal	MEMS
Output Type	CMOS	CMOS	CMOS	CMOS
Supply Voltage	3.3V	3.3V	3.3V	2.25V ~ 3.6V
Function	Enable/Disable	Enable/Disable	Enable/Disable	Enable/Disable
Frequency Stability	±25ppm	±25ppm	±25ppm	Not specified
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Max Supply Current	25mA	26mA	25mA	35mA
Package Type	4-SMD, No Lead	4-SMD, No Lead	4-SMD, No Lead	6-SMD, No Lead Exposed Pad
Package Dimensions	7.00mm x 5.00mm	7.00mm x 5.00mm	7.00mm x 5.00mm	7.00mm x 5.00mm
Max Seated Height	1.00mm	1.80mm	1.90mm	0.90mm
Product Status	Obsolete	Active	Active	Active
Moisture Sensitivity	MSL 1	MSL 1	MSL 1	MSL 1

Engineering Selection Recommendations

510CBA18M4320AAGR (Skyworks Solutions Inc.) - Direct Substitute

This part is classified as a direct substitute based on electrical parameter equivalence. It matches the TA-18.432MBD-T in frequency, output type, supply voltage, function, operating temperature range, and moisture sensitivity level. The 4-SMD, No Lead package with identical 7.00mm x 5.00mm footprint ensures mechanical compatibility. The maximum supply current of 26mA is within acceptable tolerance of the original 25mA specification. The primary design consideration is the increased seated height of 1.80mm compared to 1.00mm, which requires verification against PCB clearance constraints. The part is currently in active production status with 915 units in stock.

CPPLC7L-A7BR-18.432TS (Cardinal Components Inc.) - Direct Substitute

This part qualifies as a direct substitute with identical electrical specifications and package footprint to the TA-18.432MBD-T. The 4-SMD, No Lead configuration matches the original package type with the same 7.00mm x 5.00mm dimensions. Maximum supply current of 25mA is equivalent to the original specification. The seated height of 1.90mm requires PCB clearance verification. This part carries ROHS3 compliance and REACH Unaffected status, providing additional regulatory documentation. The part is in active production with 674 units available.

ASVMPC-18.432MHZ-LR-T (Abracon LLC) - Similar Substitute

This part is classified as a similar substitute due to package configuration differences while maintaining electrical compatibility. It shares the same frequency, CMOS output, Enable/Disable function, and operating temperature range. The supply voltage range of 2.25V ~ 3.6V encompasses the required 3.3V specification. The 6-SMD, No Lead Exposed Pad package differs from the original 4-SMD configuration, requiring PCB layout redesign and footprint verification. The maximum seated height of 0.90mm is lower than the original, providing improved clearance. Maximum supply current of 35mA exceeds the original specification and requires power budget reassessment. The part is in active production with ROHS3 compliance and REACH Unaffected status. 915 units are in stock.

Frequently Asked Questions (FAQ)

Q: Can I use the 510CBA18M4320AAGR as a direct replacement for the TA-18.432MBD-T without PCB modifications?

A: The 510CBA18M4320AAGR shares the same 7.00mm x 5.00mm footprint and 4-SMD, No Lead package configuration, allowing direct pin-to-pin replacement. However, the increased seated height of 1.80mm versus 1.00mm requires verification that PCB clearance and component stacking constraints are not violated. If clearance is adequate, no PCB modifications are necessary.

Q: What is the key difference between the MEMS-based TA-18.432MBD-T and the crystal-based 510CBA18M4320AAGR?

A: The TA-18.432MBD-T uses MEMS (Micro-Electro-Mechanical Systems) resonator technology, while the 510CBA18M4320AAGR uses crystal resonator technology. Both achieve the same ±25ppm frequency stability and operate identically from an electrical perspective. The choice between them depends on application-specific requirements such as shock/vibration tolerance, aging characteristics, and supply chain availability.

Q: Why does the ASVMPC-18.432MHZ-LR-T have a different package pin count (6-SMD vs. 4-SMD)?

A: The ASVMPC-18.432MHZ-LR-T uses a 6-SMD, No Lead Exposed Pad configuration compared to the original 4-SMD, No Lead package. The additional pins and exposed pad provide enhanced thermal management and mechanical stability. This configuration requires PCB footprint redesign and cannot be used as a direct pin-for-pin replacement.

Q: Are all three substitute parts compatible with the same supply voltage as the TA-18.432MBD-T?

A: The 510CBA18M4320AAGR and CPPLC7L-A7BR-18.432TS both operate at 3.3V, matching the original specification exactly. The ASVMPC-18.432MHZ-LR-T operates across a 2.25V ~ 3.6V range, which includes 3.3V operation. All three parts are compatible with 3.3V supply systems.

Q: What is the impact of the higher maximum supply current in the ASVMPC-18.432MHZ-LR-T (35mA vs. 25mA)?

A: The ASVMPC-18.432MHZ-LR-T draws a maximum of 35mA compared to the original 25mA specification. This 10mA increase requires verification that the power supply and current distribution network can accommodate the additional load. Systems with tight power budgets or current-limited supplies must be reassessed before substitution.

Q: Do all substitute parts have the same moisture sensitivity level as the original?

A: Yes. All three substitute parts carry MSL 1 (Unlimited) moisture sensitivity level, identical to the TA-18.432MBD-T. This means no special moisture control measures are required during storage, handling, or assembly.

Q: Which substitute part is recommended for new designs?

A: Selection depends on specific design requirements. For direct pin-compatible replacement with minimal PCB changes, use either the 510CBA18M4320AAGR or CPPLC7L-A7BR-18.432TS. For applications requiring lower seated height and wider supply voltage tolerance, use the ASVMPC-18.432MHZ-LR-T with corresponding PCB layout modifications. All three parts are in active production status.

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