ASCSM-68.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-68.000MHZ-LR-T is a 68 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. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs requiring 68 MHz oscillation at low supply voltages.

Substiute Parts

ASCSM-68.000MHZ-LR-T

Abracon LLCIn Stock: 1104ASCSM-68.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-68.000MHZ-L-T3

Abracon LLCIn Stock: 908ASCO-68.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ASCSM-68.000MHZ-LR-T is determined by the following critical parameters:

• Frequency Match: 68 MHz (exact)
• Output Type: CMOS
• Function: Enable/Disable capability
• Operating Temperature Range: -40°C ~ 85°C minimum
• Regulatory Compliance: ROHS3 Compliant, REACH Unaffected

The ASCO-68.000MHZ-L-T3 qualifies as a substitute based on matching frequency, output type, function, temperature range, and compliance certifications. However, the supply voltage range differs: the substitute operates at 3.3V fixed supply versus the main part's 1.7V ~ 3.6V range. The substitute exhibits reduced frequency stability (±50ppm versus ±25ppm) and increased supply current (8.5mA versus 6.5mA). Package form factors differ between the main part (4-UFBGA/CSPBGA) and substitute (4-SMD, No Lead), requiring PCB layout verification.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-68.000MHZ-L-T3 is available as an active product from Abracon LLC, addressing the obsolescence of the ASCSM-68.000MHZ-LR-T. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements.

Selection of the substitute requires verification of the following design constraints:

• Supply Voltage Compatibility: The substitute operates at fixed 3.3V supply. Designs requiring operation below 3.3V or across the extended 1.7V ~ 3.6V range of the main part cannot use this substitute without voltage regulation modifications.
• Frequency Stability: The substitute exhibits ±50ppm stability versus the main part's ±25ppm. Applications with tight frequency tolerance requirements must evaluate whether the reduced stability is acceptable.
• Current Budget: The substitute draws 8.5mA maximum supply current versus 6.5mA for the main part. Power-constrained applications must confirm the additional 2mA current draw is within system margins.
• Package Footprint: The transition from 4-UFBGA/CSPBGA to 4-SMD No Lead requires PCB layout redesign and component placement verification.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-68.000MHZ-L-T3 directly replace the ASCSM-68.000MHZ-LR-T without design changes?

A: Direct replacement is not possible due to package type differences (4-UFBGA/CSPBGA versus 4-SMD No Lead) and fixed 3.3V supply voltage versus the main part's 1.7V ~ 3.6V range. PCB layout modification and supply voltage verification are required.

Q: What is the impact of the frequency stability difference between the two parts?

A: The substitute exhibits ±50ppm stability compared to the main part's ±25ppm. This represents a 2x increase in frequency tolerance. Applications requiring frequency accuracy better than ±50ppm must evaluate whether this degradation affects system performance.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the ASCSM-68.000MHZ-LR-T and ASCO-68.000MHZ-L-T3 are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

Q: What are the package dimension differences?

A: The main part measures 0.070" L x 0.049" W x 0.027" H (1.79mm x 1.25mm x 0.69mm). The substitute measures 0.063" L x 0.047" W x 0.028" H (1.60mm x 1.20mm x 0.70mm). While dimensions are similar, the package form factor (UFBGA/CSPBGA versus SMD No Lead) requires distinct PCB footprints.

Q: Is the substitute suitable for low-voltage applications below 3.3V?

A: No. The substitute operates at fixed 3.3V supply voltage. Applications requiring operation at 1.7V, 2.5V, or other voltages below 3.3V cannot use this substitute without external voltage regulation.