ASCSM-1.8432MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-1.8432MHZ-LR-T is a 1.8432 MHz MEMS-based XO (Standard) CMOS oscillator manufactured by Abracon LLC, designed for applications requiring a low-frequency timing reference with wide supply voltage range (1.7V ~ 3.6V). The device features enable/disable functionality and is housed in a compact 4-UFBGA/CSPBGA package measuring 1.79mm × 1.25mm with a maximum seated height of 0.69mm.

This part has reached obsolete product status. Identifying equivalent and substitute components is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this oscillator.

Substiute Parts

ASCSM-1.8432MHZ-LR-T

Abracon LLCIn Stock: 684ASCSM-1.8432MHZ-LR-T Datasheet

Current PartRFQ

ASCO-1.8432MHZ-L-T3

Abracon LLCIn Stock: 961ASCO-1.8432MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ASCSM-1.8432MHZ-LR-T is determined by the following critical parameters:

• Frequency Match: 1.8432 MHz (exact)
• Output Type: CMOS
• Function: Enable/Disable capability
• Operating Temperature Range: -40°C ~ 85°C (minimum requirement)
• Package Compatibility: Surface mount, footprint-compatible or pin-compatible alternatives
• Supply Voltage Compatibility: Must operate within or encompass the original 1.7V ~ 3.6V range
• Frequency Stability: ±25ppm or better (tighter tolerance acceptable)
• RoHS Compliance: ROHS3 Compliant

The ASCO-1.8432MHZ-L-T3 qualifies as a substitute based on matching frequency, output type, enable/disable function, operating temperature range, and RoHS compliance. However, differences in base resonator technology, supply voltage specification, frequency stability, and package type must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-1.8432MHZ-L-T3 is available as an active product from Abracon LLC and maintains ROHS3 compliance, making it suitable for new designs and ongoing production support. The substitute part offers improved supply current efficiency (4.5mA vs. 6.5mA) and maintains the required enable/disable functionality.

Critical considerations for substitution:

• Supply Voltage: The substitute operates at a fixed 3.3V specification, whereas the original supports 1.7V ~ 3.6V. Applications requiring operation below 3.0V or above 3.6V cannot use this substitute without circuit redesign.
• Frequency Stability: The substitute exhibits ±50ppm stability compared to the original ±25ppm. Applications with tight frequency tolerance requirements must verify compatibility.
• Package Transition: The substitute uses 4-SMD No Lead packaging versus the original 4-UFBGA/CSPBGA. PCB layout and footprint modifications are required.
• Resonator Technology: The substitute employs crystal-based resonance rather than MEMS technology, which may affect long-term reliability characteristics in specific environmental conditions.

Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications and are REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-1.8432MHZ-L-T3 directly replace the ASCSM-1.8432MHZ-LR-T without PCB modifications?

A: No. The substitute uses a different package type (4-SMD No Lead vs. 4-UFBGA/CSPBGA), requiring PCB footprint redesign and re-layout. Pin configuration must be verified before implementation.

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

A: Frequency stability tolerance depends on your system requirements. The substitute's ±50ppm specification is twice the original ±25ppm. Verify that your application can tolerate this wider tolerance band before substitution.

Q: Is the fixed 3.3V supply voltage of the substitute compatible with my design?

A: The substitute operates only at 3.3V, whereas the original supports 1.7V ~ 3.6V. If your design requires operation at voltages outside the 3.0V ~ 3.6V range, this substitute is not compatible without circuit modifications.

Q: What are the differences between MEMS and crystal-based oscillators?

A: MEMS oscillators (original part) and crystal oscillators (substitute) differ in resonator technology. Both provide the required 1.8432 MHz output with CMOS logic levels and enable/disable control. The substitute's crystal-based design may exhibit different aging characteristics and environmental sensitivity compared to the MEMS-based original.

Q: Are both parts RoHS compliant?

A: Yes. Both the ASCSM-1.8432MHZ-LR-T and ASCO-1.8432MHZ-L-T3 are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

Q: What is the moisture sensitivity difference between these parts?

A: The original part carries MSL 1 (Unlimited) rating, indicating minimal moisture sensitivity. The substitute lists moisture sensitivity as Not Applicable, reflecting its crystal-based construction. Both are suitable for standard PCB assembly processes.