ASCSM-12.500MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-12.500MHZ-LR-T is a 12.5 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, necessitating identification of suitable substitute components for ongoing design requirements and production continuity.

Substiute Parts

ASCSM-12.500MHZ-LR-T

Abracon LLCIn Stock: 1108ASCSM-12.500MHZ-LR-T Datasheet

Current PartRFQ

ASCO-12.500MHZ-L-T3

Abracon LLCIn Stock: 967ASCO-12.500MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-12.500MHZ-LR-T is determined by the following critical parameters:

• Frequency Match: 12.5 MHz (exact match required)
• Output Type: CMOS (exact match required)
• Function: Enable/Disable capability (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (minimum requirement)
• Voltage Supply Compatibility: Substitute must operate within or encompass the original 1.7V ~ 3.6V range
• Frequency Stability: ±25ppm or better (tighter tolerance acceptable)
• Mounting Type: Surface Mount (exact match required)
• Compliance: RoHS3 and REACH status alignment

The ASCO-12.500MHZ-L-T3 qualifies as a substitute based on matching frequency, CMOS output, Enable/Disable function, operating temperature range, and surface mount packaging. However, the voltage supply specification differs (3.3V fixed versus 1.7V ~ 3.6V range), and frequency stability is relaxed (±50ppm versus ±25ppm).

Parameter Comparison

Engineering Selection Recommendations

The ASCO-12.500MHZ-L-T3 is an Active product from Abracon LLC and represents a viable substitute for the Obsolete ASCSM-12.500MHZ-LR-T. Both components maintain RoHS3 compliance and REACH Unaffected status, ensuring regulatory alignment.

Key considerations for substitution:

• Voltage Supply: The substitute operates at a fixed 3.3V supply, whereas the original supports 1.7V to 3.6V. Applications requiring operation below 3.3V or at the lower voltage range are not compatible with this substitute.
• Frequency Stability: The substitute exhibits ±50ppm stability compared to the original ±25ppm. Applications with stringent frequency tolerance requirements may require evaluation.
• Resonator Technology: The substitute uses a crystal-based resonator instead of MEMS. This change may affect long-term reliability characteristics and environmental performance.
• Package Transition: The substitute uses 4-SMD, No Lead packaging versus the original 4-UFBGA, CSPBGA. PCB layout and assembly process compatibility must be verified.
• Current Consumption: The substitute draws 4.5mA maximum supply current, which is lower than the original 6.5mA, providing potential power efficiency benefits.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-12.500MHZ-L-T3 replace the ASCSM-12.500MHZ-LR-T in all applications?

A: No. The substitute is compatible only with applications operating at 3.3V supply voltage. If your design requires operation at voltages below 3.3V or across the full 1.7V to 3.6V range, this substitute is not suitable.

Q: What is the impact of the frequency stability difference (±25ppm vs. ±50ppm)?

A: The substitute has a relaxed frequency tolerance specification. Applications requiring the tighter ±25ppm stability of the original must evaluate whether ±50ppm meets their performance requirements.

Q: Are the package types interchangeable?

A: No. The original uses 4-UFBGA, CSPBGA packaging while the substitute uses 4-SMD, No Lead packaging. PCB footprints, assembly processes, and soldering profiles differ. Design and manufacturing validation is required.

Q: Does the MEMS-to-crystal resonator change affect reliability?

A: The resonator technologies differ in construction and environmental response characteristics. Applications in extreme temperature, vibration, or shock environments should evaluate the crystal-based substitute against original MEMS performance specifications.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both components are RoHS3 compliant and REACH Unaffected, meeting current regulatory standards.

Q: What is the inventory status of these parts?

A: The original ASCSM-12.500MHZ-LR-T is Obsolete with 1017 pieces in stock. The substitute ASCO-12.500MHZ-L-T3 is Active with 894 pieces in stock.