ASCSM-33.000MHZ-LY-T Equivalent & Substitute Parts

Part Overview

The ASCSM-33.000MHZ-LY-T is a 33 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 classified as Obsolete, necessitating identification of equivalent substitute components for ongoing design requirements and production continuity.

Substiute Parts

ASCSM-33.000MHZ-LY-T

Abracon LLCIn Stock: 1129ASCSM-33.000MHZ-LY-T Datasheet

Current PartRFQ

ASCO-33.000MHZ-L-T3

Abracon LLCIn Stock: 991ASCO-33.000MHZ-L-T3 Datasheet

DirectRFQ

FD3300020

Diodes IncorporatedIn Stock: 1162FD3300020 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the ASCSM-33.000MHZ-LY-T must satisfy the following core electrical and mechanical criteria:

Mandatory Matching Parameters:

• Frequency: 33 MHz
• Output Type: CMOS
• Function: Enable/Disable
• Operating Temperature Range: -40°C ~ 85°C minimum
• RoHS3 Compliance

Allowable Variations:

• Supply Voltage: Substitute parts may operate at fixed voltage (3.3V) provided the application circuit supports this configuration
• Base Resonator: Crystal-based oscillators are acceptable alternatives to MEMS
• Frequency Stability: Substitutes with ±20ppm or ±50ppm are acceptable for applications where the original ±10ppm specification is not critical
• Package / Case: 4-SMD, No Lead is mechanically compatible with the original 4-UFBGA, CSPBGA footprint for surface mount applications
• Current Supply: Substitutes with higher maximum current (up to 15mA) are acceptable
• Physical Dimensions: Minor variations in length, width, and height are acceptable within standard PCB assembly tolerances

Parameter Comparison

Engineering Selection Recommendations

ASCO-33.000MHZ-L-T3 (Abracon LLC)

This substitute is the primary equivalent for the ASCSM-33.000MHZ-LY-T. Both components are manufactured by Abracon LLC and share identical frequency, output type, operating temperature range, and RoHS3 compliance. The ASCO series uses crystal-based resonator technology instead of MEMS. The fixed 3.3V supply voltage requirement must be accommodated in the application circuit. Frequency stability of ±50ppm represents a relaxation from the original ±10ppm specification. Physical dimensions are comparable with minimal height variation (0.028" vs. 0.027"). Product status is Active, ensuring long-term availability.

FD3300020 (Diodes Incorporated)

This substitute is a secondary equivalent manufactured by Diodes Incorporated under the SaRonix-eCera FD series. The component matches the 33 MHz frequency, CMOS output, and Enable/Disable function. Frequency stability of ±20ppm is intermediate between the original specification and the Abracon ASCO alternative. The operating temperature range is narrower (-20°C ~ 70°C) compared to the original (-40°C ~ 85°C), which may limit applicability in extended temperature environments. Physical dimensions are significantly larger (5.00mm x 3.20mm vs. 1.79mm x 1.25mm), requiring PCB layout reassessment. Maximum supply current is 15mA, higher than the original 6.5mA. Product status is Active with established supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-33.000MHZ-L-T3 directly replace the ASCSM-33.000MHZ-LY-T without circuit modifications?

A: The ASCO-33.000MHZ-L-T3 requires a fixed 3.3V supply voltage, whereas the original part operates across 1.7V to 3.6V. If the application circuit is designed for 3.3V operation, direct substitution is feasible. Circuits requiring lower supply voltages (1.7V to 3.0V) require redesign or alternative component selection.

Q: What is the impact of frequency stability differences between the three components?

A: The original ASCSM provides ±10ppm stability. The ASCO-33.000MHZ-L-T3 offers ±50ppm, and the FD3300020 offers ±20ppm. Applications with tight frequency tolerance requirements may not accept the ASCO substitute. The FD3300020 provides intermediate stability suitable for general-purpose timing applications.

Q: Are the package footprints compatible between these components?

A: The ASCSM uses 4-UFBGA/CSPBGA packaging. The ASCO and FD3300020 both use 4-SMD, No Lead packaging. While both are surface-mount technologies, the footprint geometries differ. The ASCO dimensions (1.60mm x 1.20mm) are comparable to the original, whereas the FD3300020 (5.00mm x 3.20mm) is significantly larger and requires PCB layout modification.

Q: Which substitute is recommended for new designs?

A: Selection depends on application requirements. For 3.3V systems with standard frequency tolerance, the ASCO-33.000MHZ-L-T3 is the preferred choice due to manufacturer continuity and comparable form factor. For applications requiring extended temperature range (-40°C ~ 85°C), the ASCO-33.000MHZ-L-T3 remains the only suitable option among the listed substitutes.

Q: What is the significance of the Obsolete product status for the original part?

A: Obsolete status indicates the ASCSM-33.000MHZ-LY-T is no longer manufactured or supported by Abracon LLC. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. New designs should transition to Active-status alternatives such as the ASCO-33.000MHZ-L-T3 or FD3300020.