ASCSM-8.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-8.000MHZ-LR-T is an 8 MHz MEMS-based XO (Standard) oscillator manufactured by Abracon LLC, designed for applications requiring low-voltage operation across 1.7V to 3.6V supply ranges. This component features CMOS output with enable/disable functionality in a compact 4-UFBGA/CSPBGA package measuring 1.79mm × 1.25mm.

The ASCSM-8.000MHZ-LR-T has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and field replacement applications.

Substiute Parts

ASCSM-8.000MHZ-LR-T

Abracon LLCIn Stock: 1097ASCSM-8.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-8.000MHZ-L-T3

Abracon LLCIn Stock: 1086ASCO-8.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-8.000MHZ-LR-T is evaluated based on the following critical parameters:

Frequency Match: 8 MHz operation is mandatory for direct substitution.

Output Configuration: CMOS output with enable/disable functionality must be maintained.

Operating Temperature Range: -40°C to 85°C compatibility is required.

Supply Voltage Compatibility: The substitute part must operate within the voltage range specified for the application. The ASCSM-8.000MHZ-LR-T supports 1.7V ~ 3.6V; substitutes operating at fixed 3.3V are acceptable for applications using 3.3V supply rails.

Frequency Stability: The ASCSM-8.000MHZ-LR-T specifies ±25ppm. Substitutes with equal or tighter stability (lower ppm value) are acceptable.

Package Compatibility: Physical dimensions and mounting type (surface mount) must accommodate PCB layout constraints.

Resonator Type: Both MEMS and crystal-based resonators are acceptable provided all electrical parameters align.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-8.000MHZ-L-T3 is a viable substitute for the obsolete ASCSM-8.000MHZ-LR-T based on the following engineering criteria:

Frequency and Output Compatibility: Both parts operate at 8 MHz with CMOS output and enable/disable functionality, meeting core oscillator requirements.

Temperature Range Alignment: Both parts maintain -40°C to 85°C operating specifications, ensuring thermal compatibility across standard industrial and commercial applications.

Supply Voltage Consideration: The ASCO-8.000MHZ-L-T3 operates at fixed 3.3V, whereas the ASCSM-8.000MHZ-LR-T supports 1.7V ~ 3.6V. Substitution is valid for designs using 3.3V supply rails. Designs requiring operation below 3.3V or across the full 1.7V range require alternative evaluation.

Frequency Stability Trade-off: The ASCO-8.000MHZ-L-T3 specifies ±50ppm compared to the main part's ±25ppm. Applications with stringent frequency stability requirements must evaluate whether the wider tolerance is acceptable.

Current Consumption: The ASCO-8.000MHZ-L-T3 draws 4.5mA maximum supply current, lower than the ASCSM-8.000MHZ-LR-T at 6.5mA, providing improved power efficiency.

Package and Footprint: Both parts are surface-mount with comparable physical dimensions (1.79mm × 1.25mm versus 1.60mm × 1.20mm) and heights (0.69mm versus 0.70mm). PCB layout compatibility must be verified for the specific package transition from 4-UFBGA/CSPBGA to 4-SMD No Lead.

Compliance and Availability: Both parts are ROHS3 compliant and REACH unaffected. The ASCO-8.000MHZ-L-T3 maintains active product status, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-8.000MHZ-L-T3 directly replace the ASCSM-8.000MHZ-LR-T in all applications?

A: Direct replacement is valid for applications operating at 3.3V supply voltage with frequency stability requirements of ±50ppm or better. Applications requiring operation below 3.3V or with tighter frequency stability (better than ±50ppm) require design evaluation and potential circuit modifications.

Q: What is the primary difference between these two oscillators?

A: The ASCSM-8.000MHZ-LR-T uses MEMS resonator technology with wide voltage support (1.7V ~ 3.6V) and tighter frequency stability (±25ppm). The ASCO-8.000MHZ-L-T3 uses crystal resonator technology, operates at fixed 3.3V, and specifies ±50ppm frequency stability. Both deliver 8 MHz CMOS output with enable/disable control.

Q: Are the packages compatible for PCB layout?

A: Both packages are surface-mount with similar footprints (1.79mm × 1.25mm versus 1.60mm × 1.20mm). However, the main part uses 4-UFBGA/CSPBGA while the substitute uses 4-SMD No Lead. PCB layout and solder reflow profiles must be verified for the specific package transition.

Q: What is the impact of the ±50ppm frequency stability on my application?

A: Frequency stability determines long-term frequency accuracy. The ASCO-8.000MHZ-L-T3 at ±50ppm has twice the tolerance of the main part at ±25ppm. For applications sensitive to frequency drift (such as precision timing or communication protocols), this difference must be evaluated against system requirements.

Q: Is the lower current consumption of the ASCO-8.000MHZ-L-T3 significant?

A: The ASCO-8.000MHZ-L-T3 draws 4.5mA versus 6.5mA for the main part, representing approximately 31% lower supply current. For battery-powered or power-constrained applications, this reduction may provide meaningful power savings.

Q: What compliance certifications apply to both parts?

A: Both the ASCSM-8.000MHZ-LR-T and ASCO-8.000MHZ-L-T3 are ROHS3 compliant and REACH unaffected, meeting standard environmental and regulatory requirements for electronic components.