ASCSM-32.768MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-32.768MHZ-LR-T is a 32.768 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 with enable/disable functionality. This part is classified as obsolete, necessitating identification of active alternative components that maintain functional and electrical compatibility for new designs or production continuity.

Substiute Parts

ASCSM-32.768MHZ-LR-T

Abracon LLCIn Stock: 725ASCSM-32.768MHZ-LR-T Datasheet

Current PartRFQ

ASCO-32.768MHZ-L-T3

Abracon LLCIn Stock: 1155ASCO-32.768MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-32.768MHZ-LR-T is determined by the following critical parameters:

Frequency matching at 32.768 MHz is mandatory. Output type must remain CMOS. Enable/disable functionality must be preserved. Operating temperature range must encompass -40°C to 85°C minimum. Supply voltage compatibility is evaluated based on the application's operating voltage window; the main part supports 1.7V to 3.6V, establishing the baseline for acceptable substitutes.

The identified substitute, ASCO-32.768MHZ-L-T3, maintains the core functional requirements of 32.768 MHz frequency, CMOS output, enable/disable control, and -40°C to 85°C temperature range. However, this substitute operates at a fixed 3.3V supply voltage, which represents a narrower voltage window than the main part. This substitution is valid for applications designed to operate at 3.3V supply levels.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-32.768MHZ-L-T3 is an active product suitable for replacing the obsolete ASCSM-32.768MHZ-LR-T in applications operating at 3.3V supply voltage. Both components are ROHS3 compliant and maintain identical operating temperature ranges.

Key considerations for selection:

Supply voltage must be fixed at 3.3V for the substitute part. The main part's wide voltage range (1.7V to 3.6V) cannot be replicated by this substitute. Frequency stability differs: the main part provides ±25ppm while the substitute provides ±50ppm. Package and footprint differ; the main part uses 4-UFBGA/CSPBGA while the substitute uses 4-SMD No Lead, requiring PCB layout modifications. Current consumption is comparable, with the substitute drawing slightly less at 6mA maximum versus 6.5mA for the main part.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-32.768MHZ-L-T3 replace the ASCSM-32.768MHZ-LR-T in all applications?

A: No. The substitute is limited to applications operating at 3.3V supply voltage. If your application requires operation across the 1.7V to 3.6V range, this substitute is not compatible.

Q: What is the difference between MEMS and Crystal resonators in these parts?

A: The main part uses MEMS technology while the substitute uses a crystal resonator. Both deliver the same 32.768 MHz frequency and CMOS output, but differ in frequency stability (±25ppm vs ±50ppm) and physical construction.

Q: Will the package change affect my PCB design?

A: Yes. The main part uses 4-UFBGA/CSPBGA packaging while the substitute uses 4-SMD No Lead. Footprint dimensions differ slightly (1.79mm x 1.25mm vs 1.60mm x 1.20mm), requiring PCB layout revision and revalidation.

Q: Are both parts RoHS compliant?

A: Yes. Both the ASCSM-32.768MHZ-LR-T and ASCO-32.768MHZ-L-T3 are ROHS3 compliant.

Q: What is the frequency stability difference and does it matter?

A: The main part specifies ±25ppm while the substitute specifies ±50ppm. Applications with tight frequency tolerance requirements may be affected. Evaluate your system's frequency accuracy specifications before substitution.