ASCSM-20.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-20.000MHZ-LR-T is a 20 MHz MEMS-based XO (Standard) oscillator manufactured by Abracon LLC, featuring 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-20.000MHZ-LR-T has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this oscillator.

Substiute Parts

ASCSM-20.000MHZ-LR-T

Abracon LLCIn Stock: 933ASCSM-20.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-20.000MHZ-L-T3

Abracon LLCIn Stock: 1037ASCO-20.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ASCSM-20.000MHZ-LR-T is determined by the following critical parameters:

• Frequency: Must be 20 MHz
• Output Type: Must be CMOS
• Function: Must support Enable/Disable
• Operating Temperature Range: Must cover -40°C ~ 85°C
• Mounting Type: Must be Surface Mount
• RoHS Compliance: Must maintain ROHS3 Compliant status

The ASCO-20.000MHZ-L-T3 qualifies as a substitute part. While it employs a crystal-based resonator instead of MEMS technology and operates at a fixed 3.3V supply voltage (versus the wider 1.7V ~ 3.6V range), it meets all critical functional and environmental requirements. The substitute maintains 20 MHz frequency output, CMOS signaling, Enable/Disable capability, identical operating temperature range, and equivalent physical mounting characteristics. Both parts are ROHS3 compliant and manufactured by Abracon LLC.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-20.000MHZ-L-T3 is suitable as a substitute for the obsolete ASCSM-20.000MHZ-LR-T based on the following factors:

Product Status: The substitute part maintains Active product status, ensuring ongoing availability and manufacturer support, whereas the main part is Obsolete.

Compliance & Certifications: Both parts are ROHS3 Compliant and carry identical REACH Unaffected and EAR99 ECCN designations, maintaining regulatory alignment.

Functional Equivalence: The substitute preserves all critical operational characteristics: 20 MHz frequency, CMOS output, Enable/Disable control, and -40°C ~ 85°C operating temperature range.

Design Considerations: Applications designed for 3.3V supply operation can directly substitute the ASCO-20.000MHZ-L-T3. Designs requiring the full 1.7V ~ 3.6V supply range of the original part require voltage regulation or alternative component selection. The substitute exhibits tighter frequency stability at ±50ppm compared to the original ±25ppm specification and lower maximum supply current (4.5mA versus 6.5mA). Package geometry differences (4-SMD, No Lead versus 4-UFBGA/CSPBGA) necessitate PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-20.000MHZ-L-T3 directly replace the ASCSM-20.000MHZ-LR-T in all applications?

A: Direct replacement is possible only in applications operating at 3.3V supply voltage. The original part supports 1.7V to 3.6V operation; the substitute is fixed at 3.3V. PCB layout changes are required due to different package types (4-SMD, No Lead versus 4-UFBGA/CSPBGA).

Q: What are the key differences between MEMS and crystal-based oscillators in this comparison?

A: The main part uses MEMS resonator technology; the substitute uses crystal resonator technology. Both deliver identical 20 MHz CMOS output with Enable/Disable functionality. The MEMS version offers tighter frequency stability (±25ppm) and wider supply voltage range (1.7V ~ 3.6V). The crystal version provides lower power consumption (4.5mA maximum) and maintains Active product status.

Q: Are there package compatibility concerns?

A: Yes. The original part uses 4-UFBGA/CSPBGA packaging (1.79mm × 1.25mm); the substitute uses 4-SMD, No Lead packaging (1.60mm × 1.20mm). PCB footprint redesign is required for substitution.

Q: Do both parts meet the same environmental and compliance standards?

A: Yes. Both parts are ROHS3 Compliant, carry REACH Unaffected status, and are classified as EAR99 for export control purposes. Both operate across the identical -40°C ~ 85°C temperature range.

Q: What is the frequency stability difference, and does it matter for my application?

A: The original part specifies ±25ppm stability; the substitute specifies ±50ppm. The substitute has twice the frequency tolerance. Applications with strict frequency accuracy requirements should evaluate whether ±50ppm stability is acceptable for their specific use case.