ASCSM-40.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-40.000MHZ-LR-T is a 40 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 currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs requiring 40 MHz oscillation at low supply voltages.

Substiute Parts

ASCSM-40.000MHZ-LR-T

Abracon LLCIn Stock: 789ASCSM-40.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-40.000MHZ-L-T3

Abracon LLCIn Stock: 824ASCO-40.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-40.000MHZ-LR-T requires matching the following critical parameters:

• Frequency: Exact match at 40 MHz
• Output Type: CMOS output required
• Function: Enable/Disable capability
• Operating Temperature Range: -40°C ~ 85°C minimum
• RoHS Compliance: ROHS3 Compliant
• Supply Voltage Compatibility: Must operate within system voltage requirements

The ASCO-40.000MHZ-L-T3 qualifies as a direct substitute based on matching frequency, CMOS output, Enable/Disable function, identical operating temperature range, and ROHS3 compliance. However, the supply voltage range differs: the substitute operates at 3.3V fixed supply versus the main part's 1.7V ~ 3.6V range. This substitution is valid only for systems with 3.3V supply voltage.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-40.000MHZ-L-T3 is an active product suitable for replacing the obsolete ASCSM-40.000MHZ-LR-T in applications with fixed 3.3V supply voltage. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment.

Key considerations for selection:

• Supply Voltage: The substitute operates at 3.3V fixed supply. The main part supports 1.7V ~ 3.6V. Substitution is valid only if system supply voltage is 3.3V.
• Frequency Stability: The substitute exhibits ±50ppm stability versus the main part's ±25ppm. Applications requiring tighter frequency tolerance must evaluate this difference.
• Resonator Technology: The main part uses MEMS technology; the substitute uses crystal resonator technology. Both deliver equivalent functional performance at 40 MHz.
• Package Transition: The main part uses 4-UFBGA/CSPBGA; the substitute uses 4-SMD No Lead. PCB layout and assembly process compatibility must be verified.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-40.000MHZ-L-T3 replace the ASCSM-40.000MHZ-LR-T in all applications?

A: No. The substitute is valid only for systems with 3.3V supply voltage. The main part supports 1.7V ~ 3.6V operation. If your system operates at voltages outside 3.3V, this substitute is not compatible.

Q: What is the difference between MEMS and crystal resonators in these oscillators?

A: Both technologies deliver 40 MHz oscillation with CMOS output and Enable/Disable function. The main part uses MEMS technology; the substitute uses crystal technology. The frequency stability differs: ±25ppm (main) versus ±50ppm (substitute).

Q: Are there package compatibility issues between the main part and substitute?

A: Yes. The main part uses 4-UFBGA/CSPBGA packaging; the substitute uses 4-SMD No Lead packaging. PCB footprint, assembly process, and thermal management may differ. Verify PCB design compatibility before implementation.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both components are ROHS3 compliant and REACH unaffected, with identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: What is the frequency stability impact of substitution?

A: The substitute exhibits ±50ppm frequency stability compared to the main part's ±25ppm. Applications with tight frequency tolerance requirements must evaluate whether this difference affects system performance.

Q: Is the substitute currently available?

A: Yes. The ASCO-40.000MHZ-L-T3 is an active product with current inventory availability, unlike the obsolete main part.