ASCSM-50.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-50.000MHZ-LR-T is a 50 MHz MEMS-based XO (Standard) oscillator manufactured by Abracon LLC, designed for applications requiring a CMOS output with enable/disable functionality. This component operates across a wide supply voltage range of 1.7V to 3.6V and is housed in a compact 4-UFBGA/CSPBGA package measuring 1.79mm × 1.25mm.

The ASCSM-50.000MHZ-LR-T has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

ASCSM-50.000MHZ-LR-T

Abracon LLCIn Stock: 738ASCSM-50.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-50.000MHZ-L-T3

Abracon LLCIn Stock: 1109ASCO-50.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ASCSM-50.000MHZ-LR-T is determined by the following critical parameters:

• Frequency Match: 50 MHz (exact)
• Output Type: CMOS
• Function: Enable/Disable capability
• Operating Temperature Range: -40°C ~ 85°C (minimum requirement)
• Compliance: RoHS3 and REACH compliance maintained

The ASCO-50.000MHZ-L-T3 qualifies as a direct substitute based on matching frequency, output type, function, and operating temperature range. However, differences exist in base resonator technology (Crystal vs. MEMS), voltage supply range, frequency stability, and package configuration. These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-50.000MHZ-L-T3 is available as an active product from Abracon LLC, ensuring ongoing supply and support. Both components maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

Key considerations for substitution:

• Voltage Supply: The ASCO operates at fixed 3.3V, whereas the ASCSM supports 1.7V to 3.6V. Designs requiring operation below 3.3V cannot use the ASCO substitute.
• Frequency Stability: The ASCO provides ±50ppm stability compared to the ASCSM's ±25ppm. Applications with tight frequency tolerance requirements must account for this difference.
• Package Configuration: The ASCO uses 4-SMD No Lead packaging versus the ASCSM's 4-UFBGA/CSPBGA. PCB layout and assembly process compatibility must be verified.
• Base Resonator Technology: The ASCO employs crystal-based resonance versus the ASCSM's MEMS technology. This affects long-term stability and environmental performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-50.000MHZ-L-T3 directly replace the ASCSM-50.000MHZ-LR-T in all applications?

A: Direct replacement is possible only when the application operates at 3.3V supply voltage, tolerates ±50ppm frequency stability, and the PCB layout accommodates the 4-SMD No Lead package. Designs requiring the full 1.7V to 3.6V supply range or tighter frequency stability cannot use this substitute without redesign.

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

A: The ASCSM uses MEMS (Micro-Electro-Mechanical Systems) resonators, while the ASCO uses crystal resonators. MEMS oscillators typically offer better shock and vibration resistance, while crystal oscillators provide established long-term stability characteristics. Both technologies meet the specified operating temperature range.

Q: Are there package compatibility issues when switching from ASCSM to ASCO?

A: Yes. The ASCSM uses 4-UFBGA/CSPBGA packaging (1.79mm × 1.25mm), while the ASCO uses 4-SMD No Lead packaging (1.60mm × 1.20mm). PCB footprints, solder reflow profiles, and assembly equipment compatibility must be verified before implementation.

Q: Does the ASCO-50.000MHZ-L-T3 meet the same compliance standards?

A: Yes. Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and use.

Q: What is the significance of the ASCSM being obsolete?

A: Obsolete status indicates the ASCSM-50.000MHZ-LR-T is no longer manufactured. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Transitioning to active products like the ASCO-50.000MHZ-L-T3 ensures design sustainability.