ASCSM-12.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-12.000MHZ-LR-T is a 12 MHz MEMS-based XO (Standard) CMOS oscillator manufactured by Abracon LLC. This component operates across a wide supply voltage range of 1.7V to 3.6V with Enable/Disable functionality, housed in a compact 4-UFBGA/CSPBGA package measuring 1.79mm × 1.25mm. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

Substiute Parts

ASCSM-12.000MHZ-LR-T

Abracon LLCIn Stock: 811ASCSM-12.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-12.000MHZ-L-T3

Abracon LLCIn Stock: 1088ASCO-12.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-12.000MHZ-LR-T requires matching the following critical parameters:

• Frequency: 12 MHz (exact match required)
• Output Type: CMOS
• Function: Enable/Disable capability
• Operating Temperature Range: -40°C ~ 85°C minimum
• Mounting Type: Surface Mount
• RoHS Compliance: ROHS3 Compliant

The ASCO-12.000MHZ-L-T3 qualifies as a substitute based on matching frequency, CMOS output, Enable/Disable function, operating temperature range, surface mount configuration, and RoHS3 compliance. However, differences exist in voltage supply range, frequency stability, current consumption, package type, and physical dimensions that must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-12.000MHZ-L-T3 is available as an active product from Abracon LLC, providing supply continuity for the obsolete ASCSM-12.000MHZ-LR-T. Both components maintain ROHS3 compliance and identical operating temperature specifications.

Critical Considerations for Selection:

• Voltage Supply Compatibility: The substitute operates at fixed 3.3V, whereas the main part supports 1.7V to 3.6V. Applications requiring operation below 3.3V or with variable supply voltages require verification of circuit design compatibility.

• Frequency Stability: The substitute exhibits ±50ppm stability compared to the main part's ±25ppm. Applications with stringent frequency tolerance requirements must confirm acceptable performance margins.

• Current Consumption: The substitute draws 4.5mA maximum supply current, lower than the main part's 6.5mA, providing potential power efficiency benefits.

• Package and Footprint: The substitute uses 4-SMD No Lead packaging versus the main part's 4-UFBGA/CSPBGA. PCB layout and assembly process compatibility must be verified.

• Physical Dimensions: Substitute dimensions (1.60mm × 1.20mm × 0.70mm) are slightly smaller than the main part (1.79mm × 1.25mm × 0.69mm), allowing potential space optimization.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-12.000MHZ-L-T3 directly replace the ASCSM-12.000MHZ-LR-T in existing designs?

A: Direct replacement requires verification of three factors: (1) circuit supply voltage fixed at 3.3V or compatible with 3.3V operation, (2) acceptance of ±50ppm frequency stability in place of ±25ppm, and (3) PCB layout compatibility with 4-SMD No Lead package versus 4-UFBGA/CSPBGA footprint.

Q: What is the primary difference between MEMS and Crystal-based oscillators in this comparison?

A: The main part uses MEMS (Micro-Electro-Mechanical Systems) resonator technology, while the substitute uses a crystal resonator. Both deliver identical 12 MHz frequency output with CMOS logic levels and Enable/Disable functionality. The choice between technologies depends on application-specific requirements for frequency stability, power consumption, and package constraints.

Q: Are both parts suitable for industrial temperature applications?

A: Yes. Both components specify -40°C to 85°C operating temperature range, meeting industrial temperature requirements. RoHS3 compliance is maintained by both parts.

Q: What are the package footprint implications for PCB redesign?

A: The main part uses 4-UFBGA/CSPBGA (1.79mm × 1.25mm), while the substitute uses 4-SMD No Lead (1.60mm × 1.20mm). The substitute's smaller footprint may allow board space optimization, but assembly process compatibility with existing pick-and-place equipment and reflow profiles must be confirmed.

Q: Is the lower current consumption of the substitute a significant advantage?

A: The substitute's 4.5mA maximum supply current versus the main part's 6.5mA represents approximately 31% reduction in active current draw. For battery-powered or power-constrained applications, this difference may provide meaningful system-level power efficiency improvements.