ASCSM-29.4912MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-29.4912MHZ-LR-T is a 29.4912 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-29.4912MHZ-LR-T has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for ongoing production and maintenance requirements.

Substiute Parts

ASCSM-29.4912MHZ-LR-T

Abracon LLCIn Stock: 968ASCSM-29.4912MHZ-LR-T Datasheet

Current PartRFQ

ASCO-29.4912MHZ-L-T3

Abracon LLCIn Stock: 1039ASCO-29.4912MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ASCSM-29.4912MHZ-LR-T must satisfy the following criteria:

Mandatory Matching Parameters:

• Frequency: 29.4912 MHz (exact match required)
• Output Type: CMOS
• Operating Temperature Range: -40°C ~ 85°C (minimum)
• RoHS3 Compliance
• Surface Mount technology

Allowable Variations:

• Base Resonator: MEMS or Crystal (both acceptable for frequency generation)
• Supply Voltage: Substitute may operate at fixed voltage (3.3V) if application permits, or maintain wide voltage range (1.7V ~ 3.6V)
• Frequency Stability: Substitute may have relaxed tolerance (±50ppm acceptable vs. ±25ppm original)
• Package Type: Alternative SMD packages acceptable if footprint compatibility verified
• Maximum Supply Current: Substitute may have equal or lower current draw

The ASCO-29.4912MHZ-L-T3 meets these substitution criteria with the exception of supply voltage range, which is fixed at 3.3V rather than the original 1.7V ~ 3.6V range.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-29.4912MHZ-L-T3 is an active product from the same manufacturer, ensuring continued availability and support. Both components maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements.

The primary design consideration for substitution is the fixed 3.3V supply voltage of the ASCO variant versus the wide 1.7V ~ 3.6V range of the original ASCSM. This substitution is viable only for applications where the system supply voltage is confirmed at 3.3V or can be adapted to this voltage level.

The ASCO variant exhibits relaxed frequency stability (±50ppm vs. ±25ppm), which may impact timing-critical applications. Verify that the application's frequency tolerance requirements can accommodate this specification change.

Package dimensions are comparable between both components, with the ASCO variant slightly smaller. Footprint compatibility must be verified for the transition from 4-UFBGA/CSPBGA to 4-SMD No Lead packaging.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-29.4912MHZ-L-T3 directly replace the ASCSM-29.4912MHZ-LR-T?

A: Direct replacement is possible only if the application operates at a fixed 3.3V supply voltage. The original component supports 1.7V to 3.6V operation. If your circuit requires operation below 3.3V or uses variable supply voltages, this substitute is not compatible without circuit redesign.

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

A: Both MEMS and Crystal resonators generate the specified 29.4912 MHz frequency. MEMS technology typically offers better shock/vibration resistance and smaller package sizes. Crystal-based oscillators may provide different aging characteristics. For this substitution, both technologies are functionally equivalent at the specified frequency.

Q: Does the ±50ppm frequency stability of the substitute affect my application?

A: Frequency stability tolerance depends on your application requirements. If your design requires ±25ppm or tighter tolerance, the substitute's ±50ppm specification may not be acceptable. Verify your system's frequency tolerance budget before proceeding with substitution.

Q: Are the package types compatible?

A: The original uses 4-UFBGA/CSPBGA packaging while the substitute uses 4-SMD No Lead packaging. Although both are surface-mount components with similar dimensions (1.79mm vs. 1.60mm length), the footprints differ. PCB layout and reflow profile compatibility must be verified before implementation.

Q: Is the Enable/Disable function available on both parts?

A: Yes, both the ASCSM-29.4912MHZ-LR-T and ASCO-29.4912MHZ-L-T3 include Enable/Disable functionality, allowing dynamic power management in your application.

Q: What is the maximum supply current difference between these parts?

A: The original draws 6.5mA maximum while the substitute draws 6mA maximum. The substitute has slightly lower current consumption, which may provide marginal power savings in battery-powered applications.