ASCSM-27.120MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-27.120MHZ-LR-T is a 27.12 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. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

Substiute Parts

ASCSM-27.120MHZ-LR-T

Abracon LLCIn Stock: 1069ASCSM-27.120MHZ-LR-T Datasheet

Current PartRFQ

ASCO-27.120MHZ-L-T3

Abracon LLCIn Stock: 701ASCO-27.120MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-27.120MHZ-LR-T is determined by the following critical parameters:

Frequency Match: 27.12 MHz is the primary selection criterion. All substitute parts must operate at this exact frequency.

Output Configuration: CMOS output with Enable/Disable functionality must be maintained for circuit compatibility.

Voltage Supply Compatibility: The original part operates across 1.7V to 3.6V. Substitute parts must support the voltage range required by the application. A substitute with a narrower range (such as 3.3V only) is acceptable if the application operates within that range.

Frequency Stability: The original specification of ±25ppm establishes the baseline. Substitutes with equal or tighter stability (lower ppm value) are acceptable.

Operating Temperature Range: The -40°C to 85°C range must be maintained or exceeded.

Package and Mounting: Surface mount packages with compatible footprints and pinouts enable direct substitution.

Compliance and Status: Active product status ensures ongoing availability and support. RoHS3 compliance and MSL ratings must be verified for manufacturing compatibility.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-27.120MHZ-L-T3 is an active substitute for the obsolete ASCSM-27.120MHZ-LR-T. Both parts share identical frequency, CMOS output, Enable/Disable functionality, and operating temperature range. Both maintain ROHS3 compliance.

Voltage Supply Consideration: The substitute operates at 3.3V fixed supply, compared to the original's 1.7V to 3.6V range. This substitution is valid only for applications designed to operate at 3.3V. Applications requiring the full 1.7V to 3.6V range cannot use this substitute without circuit redesign.

Frequency Stability: The substitute exhibits ±50ppm stability versus the original's ±25ppm. Applications with tight frequency tolerance requirements must evaluate whether the degraded stability is acceptable.

Resonator Technology: The original uses MEMS technology; the substitute uses crystal technology. Both technologies deliver the specified frequency and stability at the stated operating conditions.

Package Compatibility: The substitute uses 4-SMD No Lead packaging versus the original's 4-UFBGA/CSPBGA. PCB layout and footprint modifications are required. Physical dimensions are comparable (1.60mm x 1.20mm versus 1.79mm x 1.25mm), with negligible height difference (0.70mm versus 0.69mm).

Product Availability: The substitute is active and in stock, ensuring supply chain continuity for the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-27.120MHZ-L-T3 directly replace the ASCSM-27.120MHZ-LR-T without PCB modifications?

A: No. The package types differ (4-SMD No Lead versus 4-UFBGA/CSPBGA), requiring PCB footprint redesign and layout changes. Pinout compatibility must be verified before implementation.

Q: What is the impact of the voltage supply difference (1.7V-3.6V versus 3.3V)?

A: The substitute operates only at 3.3V. If your application requires operation across the full 1.7V to 3.6V range, this substitute is not compatible without circuit redesign to accommodate fixed 3.3V operation.

Q: Does the ±50ppm frequency stability of the substitute affect circuit performance?

A: Frequency stability impact depends on application requirements. The substitute's ±50ppm is twice the original's ±25ppm. Applications with tight frequency tolerance specifications must evaluate whether this degradation is acceptable for their use case.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the ASCSM-27.120MHZ-LR-T and ASCO-27.120MHZ-L-T3 are ROHS3 compliant, meeting environmental and regulatory requirements.

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

A: Both technologies deliver the specified 27.12 MHz frequency and stability. MEMS resonators (original) and crystal resonators (substitute) are functionally equivalent for this application when operating within their specified parameters.

Q: Is the disable current specification important for my selection?

A: The original specifies 15µA disable current; the substitute does not provide this specification. If your application relies on precise disable current characteristics for power management calculations, verify the substitute's disable current with the manufacturer before implementation.