ASCSM-7.3728MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-7.3728MHZ-LR-T is a 7.3728 MHz MEMS-based XO (Standard) oscillator manufactured by Abracon LLC. This component operates across a wide supply voltage range of 1.7V to 3.6V with CMOS output and Enable/Disable functionality. The part is classified as Obsolete, making identification of suitable substitute components essential for ongoing production and maintenance applications requiring this specific frequency.

Substiute Parts

ASCSM-7.3728MHZ-LR-T

Abracon LLCIn Stock: 1047ASCSM-7.3728MHZ-LR-T Datasheet

Current PartRFQ

ASCO-7.3728MHZ-L-T3

Abracon LLCIn Stock: 780ASCO-7.3728MHZ-L-T3 Datasheet

DirectRFQ

TD-7.3728MBD-T

TXC CORPORATIONIn Stock: 5732TD-7.3728MBD-T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ASCSM-7.3728MHZ-LR-T is determined by the following critical parameters:

• Frequency match: 7.3728 MHz (exact)
• Output type: CMOS
• Function: Enable/Disable capability
• Operating temperature range: -40°C ~ 85°C minimum
• Frequency stability: ±25ppm or better
• Supply voltage compatibility: Must support the application's operating voltage

Two substitute parts are identified based on these criteria:

1. ASCO-7.3728MHZ-L-T3 (Abracon LLC): Crystal-based oscillator with 3.3V supply, Active status
2. TD-7.3728MBD-T (TXC CORPORATION): MEMS-based oscillator with 3.3V supply, Obsolete status

Parameter Comparison

Engineering Selection Recommendations

ASCO-7.3728MHZ-L-T3 is the preferred substitute when supply voltage is fixed at 3.3V. This part maintains Active product status, ensuring long-term availability and supply chain stability. The crystal-based resonator provides ±50ppm frequency stability, which is acceptable for applications tolerating this specification. Current consumption is optimized at 4.5mA maximum. Package dimensions are comparable to the original part, facilitating PCB layout compatibility. ROHS3 compliance is maintained.

TD-7.3728MBD-T is an alternative when MEMS resonator technology is required to match the original part's characteristics. This part matches the ±25ppm frequency stability of the ASCSM-7.3728MHZ-LR-T. However, the larger package footprint (2.50mm x 2.00mm) may require PCB layout modifications. Product status is Obsolete, presenting potential long-term supply constraints. Maximum current consumption is significantly higher at 25mA.

Applications operating at supply voltages below 3.3V cannot use either substitute without voltage regulation modifications, as both require fixed 3.3V supply.

Frequently Asked Questions (FAQ)

Q: Can ASCO-7.3728MHZ-L-T3 replace ASCSM-7.3728MHZ-LR-T in all applications?

A: Substitution is valid only when the application supply voltage is fixed at 3.3V. The original part supports 1.7V to 3.6V operation; applications requiring lower voltage operation require alternative solutions.

Q: What is the impact of frequency stability difference between ASCSM-7.3728MHZ-LR-T (±25ppm) and ASCO-7.3728MHZ-L-T3 (±50ppm)?

A: The ASCO variant has twice the frequency tolerance. Applications with tight frequency requirements must evaluate whether ±50ppm stability meets system specifications.

Q: Are package changes required when substituting with TD-7.3728MBD-T?

A: Yes. The TD part uses a larger 4-SMD, No Lead package (2.50mm x 2.00mm) compared to the original 4-UFBGA, CSPBGA package (1.79mm x 1.25mm). PCB layout modifications are necessary.

Q: Why is ASCO-7.3728MHZ-L-T3 preferred over TD-7.3728MBD-T?

A: ASCO-7.3728MHZ-L-T3 maintains Active product status, ensuring continued availability. It also features lower power consumption (4.5mA vs. 25mA) and a smaller package footprint closer to the original part.

Q: Are both substitutes RoHS compliant?

A: Yes. Both ASCO-7.3728MHZ-L-T3 and TD-7.3728MBD-T are ROHS3 compliant, matching the original part's environmental compliance.