ASCSM-54.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-54.000MHZ-LR-T is a 54 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 CMOS output and Enable/Disable functionality. 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-54.000MHZ-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.

Key Parameters

Parameter	Value
Frequency	54 MHz
Output Type	CMOS
Function	Enable/Disable
Voltage Supply Range	1.7V ~ 3.6V
Frequency Stability	±25ppm
Operating Temperature	-40°C ~ 85°C
Current Supply (Max)	6.5mA
Current Supply (Disable)	15µA
Package Type	4-UFBGA, CSPBGA
Size	1.79mm × 1.25mm
Height (Max)	0.69mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the ASCSM-54.000MHZ-LR-T must satisfy the following criteria:

Frequency: 54 MHz (exact match required)
Output Type: CMOS
Function: Enable/Disable capability
Operating Temperature Range: -40°C ~ 85°C (minimum requirement)
RoHS3 Compliance
Surface mount packaging with compatible footprint dimensions

The ASCO-54.000MHZ-L-T3 qualifies as a substitute based on matching frequency, CMOS output, Enable/Disable function, and operating temperature range. However, differences exist in base resonator technology (Crystal vs. MEMS), supply voltage range, frequency stability, and package configuration. These differences require engineering evaluation for specific application requirements.

Parameter Comparison

Parameter	ASCSM-54.000MHZ-LR-T (Main)	ASCO-54.000MHZ-L-T3 (Substitute)
Manufacturer	Abracon LLC	Abracon LLC
Frequency	54 MHz	54 MHz
Output Type	CMOS	CMOS
Function	Enable/Disable	Enable/Disable
Voltage Supply	1.7V ~ 3.6V	3.3V
Frequency Stability	±25ppm	±50ppm
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Current Supply (Max)	6.5mA	8.5mA
Current Supply (Disable)	15µA	Not Specified
Base Resonator	MEMS	Crystal
Package Type	4-UFBGA, CSPBGA	4-SMD, No Lead
Size	1.79mm × 1.25mm	1.60mm × 1.20mm
Height (Max)	0.69mm	0.70mm
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active

Engineering Selection Recommendations

The ASCO-54.000MHZ-L-T3 is available as an active product from Abracon LLC, addressing the obsolescence of the ASCSM-54.000MHZ-LR-T. Both components maintain ROHS3 compliance and identical operating temperature specifications.

Selection of the ASCO-54.000MHZ-L-T3 requires verification of the following application-specific constraints:

Supply voltage compatibility: The substitute operates at 3.3V fixed supply versus the main part's 1.7V to 3.6V range. Designs requiring operation below 3.3V or with variable supply voltages cannot use this substitute without circuit modification.
Frequency stability: The substitute exhibits ±50ppm stability compared to the main part's ±25ppm. Applications with tight frequency tolerance requirements must evaluate this difference.
Package footprint: The substitute uses 4-SMD No Lead packaging versus 4-UFBGA/CSPBGA. PCB layout and assembly process compatibility must be confirmed.
Current consumption: The substitute draws 8.5mA maximum versus 6.5mA for the main part, representing a 30.8% increase in active current draw.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-54.000MHZ-L-T3 directly replace the ASCSM-54.000MHZ-LR-T without circuit modifications?

A: Direct replacement is not guaranteed. The substitute operates at a fixed 3.3V supply voltage, whereas the original part supports 1.7V to 3.6V. If your circuit uses supply voltages outside the 3.3V specification, circuit modifications are required. Package differences (4-SMD No Lead vs. 4-UFBGA/CSPBGA) also require PCB layout changes.

Q: What is the impact of the frequency stability difference between these parts?

A: The main part specifies ±25ppm frequency stability, while the substitute specifies ±50ppm. This represents a 2× tolerance increase. Applications requiring frequency accuracy better than ±50ppm cannot use the substitute without additional frequency compensation or selection of alternative parts.

Q: Are both parts RoHS compliant?

A: Yes. Both the ASCSM-54.000MHZ-LR-T and ASCO-54.000MHZ-L-T3 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What are the package compatibility considerations?

A: The main part uses 4-UFBGA/CSPBGA packaging (1.79mm × 1.25mm), while the substitute uses 4-SMD No Lead packaging (1.60mm × 1.20mm). These packages have different footprints and solder attachment methods. PCB redesign and assembly process validation are necessary for substitution.

Q: How does the current consumption difference affect system design?

A: The substitute draws 8.5mA maximum active current versus 6.5mA for the main part. In applications with power-constrained designs or battery operation, this 2mA increase may impact battery life or thermal management. The main part also specifies 15µA disable current, while the substitute does not provide this specification.

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