ASCSM-44.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-44.000MHZ-LR-T is a 44 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 Enable/Disable functionality and CMOS output. The device is housed in a compact 4-UFBGA/CSPBGA package measuring 1.79mm × 1.25mm with a maximum seated height of 0.69mm.

The ASCSM-44.000MHZ-LR-T has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Substiute Parts

ASCSM-44.000MHZ-LR-T

Abracon LLCIn Stock: 758ASCSM-44.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-44.000MHZ-L-T3

Abracon LLCIn Stock: 856ASCO-44.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-44.000MHZ-LR-T is determined by the following critical parameters:

• Frequency Match: 44 MHz (exact match required)
• Output Type: CMOS (exact match required)
• Function: Enable/Disable capability (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• Supply Voltage Compatibility: Substitute must operate within or encompass the original 1.7V ~ 3.6V range
• Frequency Stability: Substitute must meet or exceed ±25ppm specification
• Package Compatibility: Physical dimensions and mounting type must accommodate PCB layout constraints
• Compliance: RoHS3 and REACH compliance status must be maintained

The ASCO-44.000MHZ-L-T3 qualifies as a substitute based on matching frequency, output type, function, operating temperature, and compliance requirements. However, the supply voltage range differs, requiring design verification for applications utilizing the full 1.7V lower limit of the original part.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-44.000MHZ-L-T3 is an active product from the same manufacturer, ensuring ongoing support and availability. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for current production environments.

Key considerations for selection:

Supply Voltage: The substitute operates at a fixed 3.3V supply, whereas the original supports 1.7V to 3.6V. Applications requiring operation below 3.0V or utilizing the full 1.7V minimum specification require design verification or alternative sourcing.

Frequency Stability: The substitute exhibits ±50ppm stability compared to the original ±25ppm. Applications with stringent frequency tolerance requirements must evaluate whether the degraded stability is acceptable for the intended function.

Resonator Technology: The substitute uses crystal-based resonance instead of MEMS. Both technologies support the specified frequency and output characteristics; however, crystal oscillators may exhibit different aging characteristics and environmental sensitivity profiles.

Package Transition: The substitute uses 4-SMD No Lead packaging versus the original 4-UFBGA/CSPBGA. Physical dimensions are comparable (1.60mm × 1.20mm vs. 1.79mm × 1.25mm), and seated heights are equivalent (0.70mm vs. 0.69mm), permitting direct PCB layout substitution in most applications.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-44.000MHZ-L-T3 directly replace the ASCSM-44.000MHZ-LR-T in all applications?

A: Direct replacement is possible for applications operating at 3.3V supply voltage with frequency stability requirements of ±50ppm or better. Applications requiring the full 1.7V to 3.6V supply range or tighter than ±50ppm stability require design evaluation.

Q: What is the primary difference between MEMS and crystal-based oscillators?

A: The original uses MEMS (Micro-Electro-Mechanical Systems) resonance, while the substitute uses crystal resonance. Both deliver the specified 44 MHz frequency and CMOS output. Crystal oscillators may exhibit different temperature coefficients and aging rates; however, both operate across the -40°C to 85°C temperature range.

Q: Are the packages physically compatible?

A: The ASCO-44.000MHZ-L-T3 (4-SMD, No Lead) has comparable dimensions to the ASCSM-44.000MHZ-LR-T (4-UFBGA/CSPBGA). Both measure approximately 1.6mm to 1.8mm in length and width with seated heights near 0.70mm. PCB layout compatibility is generally achievable; however, verify specific footprint requirements with your PCB design tools.

Q: Does the substitute meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, satisfying current regulatory requirements for electronic component manufacturing and distribution.

Q: What is the significance of the substitute being an active product?

A: Active product status ensures ongoing manufacturing, quality support, and availability from the manufacturer. The original obsolete status makes long-term sourcing uncertain, making the active substitute a more reliable choice for current and future production.

Q: How does the frequency stability difference affect circuit performance?

A: The substitute's ±50ppm stability is half that of the original ±25ppm. For applications sensitive to frequency drift (such as precision timing or communication protocols), evaluate whether ±50ppm remains within acceptable tolerance. For general-purpose timing applications, the difference may be negligible.