ASCSM-65.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-65.000MHZ-LR-T is a 65 MHz MEMS-based XO (Standard) CMOS oscillator manufactured by Abracon LLC. This component operates across a wide supply voltage range of 1.7V to 3.6V with Enable/Disable functionality, housed in a compact 4-UFBGA/CSPBGA package measuring 1.79mm × 1.25mm. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs requiring this frequency specification.

Substiute Parts

ASCSM-65.000MHZ-LR-T

Abracon LLCIn Stock: 978ASCSM-65.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-65.000MHZ-L-T3

Abracon LLCIn Stock: 750ASCO-65.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-65.000MHZ-LR-T is determined by the following critical parameters:

• Frequency Match: 65 MHz output frequency is mandatory
• Output Configuration: CMOS output required
• Enable/Disable Function: Control capability must be present
• Operating Temperature Range: -40°C to 85°C minimum
• Package Compatibility: Surface mount configuration with compatible footprint dimensions
• Supply Voltage Compatibility: Substitute must operate within system supply voltage specifications
• Frequency Stability: ±25ppm or better preferred for timing-critical applications

The ASCO-65.000MHZ-L-T3 qualifies as a functional substitute based on matching frequency, output type, function, temperature range, and compliance certifications. Differences in base resonator technology (Crystal vs. MEMS), supply voltage range, and frequency stability represent trade-offs requiring application-level evaluation.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-65.000MHZ-L-T3 is an active product with confirmed availability (723 pcs in stock), providing supply continuity for the obsolete ASCSM-65.000MHZ-LR-T. Both components meet ROHS3 compliance and REACH requirements.

Substitution Constraints:

• The ASCO operates at fixed 3.3V supply, whereas the ASCSM supports 1.7V to 3.6V. Designs requiring operation below 3.3V cannot use this substitute without voltage regulation modifications.
• Frequency stability differs: ASCO provides ±50ppm versus ASCSM's ±25ppm. Applications with tight frequency tolerance requirements must account for this degradation.
• Package footprints differ (4-UFBGA/CSPBGA vs. 4-SMD, No Lead). PCB layout redesign is required; however, physical dimensions are comparable (height difference of 0.01mm is negligible).
• Maximum supply current increases from 6.5mA to 8.5mA; power budget impact must be evaluated.

Compliance Status: Both components carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications, supporting regulatory continuity.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-65.000MHZ-L-T3 directly replace the ASCSM-65.000MHZ-LR-T without PCB modification?

A: No. The package types differ (4-UFBGA/CSPBGA vs. 4-SMD, No Lead), requiring footprint redesign and PCB layout changes. Physical dimensions are similar but pin configurations are not compatible.

Q: What is the impact of the ±50ppm frequency stability on system performance?

A: The ASCO's ±50ppm stability is twice the tolerance of the ASCSM's ±25ppm. Applications sensitive to frequency drift (such as precision timing or communication protocols with tight synchronization windows) must evaluate whether this degradation affects system specifications.

Q: Is the ASCO-65.000MHZ-L-T3 suitable for low-voltage applications?

A: No. The ASCO operates at 3.3V fixed supply, whereas the ASCSM supports 1.7V to 3.6V. Systems requiring operation below 3.3V require external voltage regulation or alternative component selection.

Q: What is the difference between MEMS and Crystal-based oscillators?

A: The ASCSM uses MEMS (Micro-Electro-Mechanical Systems) resonators, while the ASCO uses traditional crystal resonators. MEMS oscillators typically offer better shock/vibration resistance and lower power consumption at the cost of slightly higher frequency stability tolerance. Both technologies are suitable for general-purpose timing applications.

Q: Are there any supply chain or lead time advantages to using the ASCO substitute?

A: Yes. The ASCO-65.000MHZ-L-T3 is an active product with 723 units in current inventory, whereas the ASCSM is obsolete. The ASCO provides assured long-term availability for production and support applications.

Q: Do both components require the same disable current specifications?

A: No. The ASCSM specifies 15µA maximum disable current, while the ASCO does not provide this specification. If disable current performance is critical to system power management, this parameter must be confirmed with the manufacturer before substitution.