ASCSM-60.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-60.000MHZ-LR-T is a 60 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 product is currently classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

Substiute Parts

ASCSM-60.000MHZ-LR-T

Abracon LLCIn Stock: 849ASCSM-60.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-60.000MHZ-L-T3

Abracon LLCIn Stock: 790ASCO-60.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-60.000MHZ-LR-T is determined by the following critical parameters:

Mandatory Matching Criteria:

• Frequency: 60 MHz (exact match required)
• Output Type: CMOS
• Function: Enable/Disable capability
• Operating Temperature Range: -40°C ~ 85°C (minimum)
• Mounting Type: Surface Mount

Allowable Variation Parameters:

• Base Resonator: MEMS or Crystal (both acceptable for XO standard oscillators)
• Voltage Supply Range: Substitute must support the application's required voltage; 3.3V fixed supply is acceptable if the application operates at this voltage
• Frequency Stability: Substitute may have relaxed tolerance (±50ppm acceptable vs. ±25ppm original)
• Current Consumption: Substitute may have higher maximum supply current if within application power budget
• Package Type: Different SMD packages acceptable if footprint compatibility is verified
• Physical Dimensions: Minor variations acceptable within PCB layout constraints

The ASCO-60.000MHZ-L-T3 meets all mandatory criteria and represents a direct functional substitute despite differences in resonator technology and supply voltage specification.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-60.000MHZ-L-T3 is the qualified substitute for the obsolete ASCSM-60.000MHZ-LR-T based on the following factors:

Product Status: The substitute is Active, ensuring long-term availability and manufacturing support, whereas the main part is Obsolete.

Compliance & Certifications: Both parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for equivalent applications.

Functional Equivalence: Both oscillators deliver 60 MHz CMOS output with Enable/Disable control across the required -40°C to 85°C operating temperature range.

Voltage Consideration: The substitute operates at fixed 3.3V supply. Applications requiring the extended 1.7V to 3.6V range of the original part must confirm 3.3V compatibility before substitution.

Frequency Stability Trade-off: The substitute exhibits ±50ppm stability versus the original ±25ppm. Applications with stringent frequency tolerance requirements must evaluate whether this relaxed specification remains acceptable.

Package & Footprint: 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), but PCB layout verification is required to confirm footprint compatibility.

Current Consumption: The substitute draws up to 8.5mA versus 6.5mA for the original. Power budget analysis is necessary for battery-powered or low-power applications.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-60.000MHZ-L-T3 directly replace the ASCSM-60.000MHZ-LR-T without PCB modifications?

A: Direct replacement requires verification of two factors: (1) PCB footprint compatibility between 4-UFBGA, CSPBGA and 4-SMD, No Lead packages, and (2) confirmation that the application operates at 3.3V supply voltage. If both conditions are met, no modifications are necessary. If the application requires the extended 1.7V to 3.6V range, substitution is not feasible.

Q: What is the impact of the ±50ppm frequency stability on system performance?

A: The substitute's ±50ppm specification is twice the tolerance of the original ±25ppm. For applications where frequency accuracy is critical (such as precision timing or communication protocols with tight synchronization requirements), this relaxed tolerance may introduce unacceptable error. Applications with looser frequency requirements will not be affected.

Q: Are there any differences in Enable/Disable functionality between the two parts?

A: Both parts provide Enable/Disable control with identical CMOS output. The disable-mode current consumption differs: the original draws 15µA maximum, while the substitute specification does not provide this parameter. For applications requiring precise power management during disable mode, this difference should be evaluated against actual application requirements.

Q: What is the significance of the MEMS versus Crystal resonator difference?

A: The original uses MEMS (Micro-Electro-Mechanical Systems) technology, while the substitute uses a traditional crystal resonator. Both technologies deliver equivalent 60 MHz XO performance for standard applications. MEMS oscillators typically offer superior shock and vibration resistance, while crystal oscillators provide established long-term reliability data. For most applications, this difference is not functionally significant.

Q: Is the higher current consumption of the substitute (8.5mA vs. 6.5mA) a concern?

A: The 2mA difference represents approximately 31% higher supply current. For battery-powered or energy-constrained applications, this increase may impact operating time or require power supply redesign. For line-powered applications, this difference is typically negligible.

Q: What compliance certifications apply to both parts?

A: Both the ASCSM-60.000MHZ-LR-T and ASCO-60.000MHZ-L-T3 are ROHS3 compliant and REACH Unaffected, satisfying environmental and hazardous substance regulations for equivalent applications.