ASCSM-16.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-16.000MHZ-LR-T is a 16 MHz MEMS-based XO (Standard) CMOS oscillator manufactured by Abracon LLC, designed for applications requiring low-voltage operation across 1.7V to 3.6V supply ranges. This oscillator 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.

The ASCSM-16.000MHZ-LR-T has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Frequency	16 MHz
Output Type	CMOS
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
Package Dimensions	1.79mm L × 1.25mm W
Height (Seated Max)	0.69mm
Base Resonator	MEMS
Function	Enable/Disable
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the ASCSM-16.000MHZ-LR-T is determined by the following critical parameters:

Frequency Match: 16 MHz (exact)
Output Type: CMOS (exact)
Operating Temperature Range: -40°C ~ 85°C (exact)
Enable/Disable Function: Required
Package Compatibility: Surface mount, compact form factor
Voltage Supply Compatibility: Must operate within or encompass the 1.7V ~ 3.6V range
Frequency Stability: ±25ppm or better
Current Consumption: Must not exceed maximum ratings for the application
Compliance: ROHS3 and REACH compliance maintained

The ASCO-16.000MHZ-L-T3 qualifies as a substitute part based on matching frequency, output type, operating temperature range, Enable/Disable function, and compliance certifications. However, voltage supply range and frequency stability differ and must be evaluated against specific application requirements.

Parameter Comparison

Parameter	ASCSM-16.000MHZ-LR-T (Main)	ASCO-16.000MHZ-L-T3 (Substitute)
Manufacturer	Abracon LLC	Abracon LLC
Frequency	16 MHz	16 MHz
Output Type	CMOS	CMOS
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	4.5mA
Current Supply (Disable)	15µA	Not Specified
Function	Enable/Disable	Enable/Disable
Package Type	4-UFBGA, CSPBGA	4-SMD, No Lead
Package Dimensions	1.79mm L × 1.25mm W	1.60mm L × 1.20mm W
Height (Seated Max)	0.69mm	0.70mm
Base Resonator	MEMS	Crystal
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The ASCO-16.000MHZ-L-T3 is available as an active product from Abracon LLC with confirmed inventory, making it suitable for replacing the obsolete ASCSM-16.000MHZ-LR-T in new designs and production continuity scenarios.

Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The ASCO-16.000MHZ-L-T3 demonstrates lower maximum supply current (4.5mA versus 6.5mA), which may provide power consumption benefits in battery-operated applications.

Key differences requiring design evaluation:

Voltage Supply: The substitute operates at fixed 3.3V rather than the wide 1.7V ~ 3.6V range of the main part. Applications requiring sub-3.3V operation cannot use this substitute.
Frequency Stability: The substitute specifies ±50ppm versus ±25ppm for the main part. Applications with tight frequency tolerance requirements must account for this difference.
Package Type: The substitute uses 4-SMD No Lead packaging versus 4-UFBGA/CSPBGA. PCB layout and assembly process compatibility must be verified.
Resonator Technology: The substitute uses crystal-based resonance versus MEMS technology in the main part. This may affect long-term reliability characteristics and environmental performance.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-16.000MHZ-L-T3 replace the ASCSM-16.000MHZ-LR-T in all applications?

A: No. The substitute is suitable only for applications operating at 3.3V supply voltage. Designs requiring operation below 3.3V or across the full 1.7V ~ 3.6V range require alternative solutions.

Q: What is the impact of the ±50ppm frequency stability specification on the substitute part?

A: The substitute part has twice the frequency tolerance of the main part (±50ppm versus ±25ppm). Applications with frequency-dependent timing requirements, such as communication protocols or precision timing circuits, must verify that ±50ppm stability meets system specifications.

Q: Are the package types mechanically compatible?

A: The packages differ: 4-UFBGA/CSPBGA (main) versus 4-SMD No Lead (substitute). While both are compact surface-mount packages with similar footprint dimensions (1.79mm × 1.25mm versus 1.60mm × 1.20mm), PCB layout, solder reflow profiles, and assembly equipment compatibility must be verified before implementation.

Q: Does the substitute part support the same Enable/Disable functionality?

A: Yes. Both parts feature Enable/Disable function for power management applications.

Q: What are the compliance and regulatory implications of using the substitute?

A: Both parts maintain ROHS3 compliance and REACH unaffected status. No additional regulatory review is required from a compliance perspective.

Q: Is the lower supply current of the substitute part a direct advantage?

A: The substitute's maximum supply current of 4.5mA is lower than the main part's 6.5mA, which may reduce power consumption. However, this advantage applies only to designs operating at 3.3V. The disable-mode current specification is not provided for the substitute, so standby power consumption cannot be directly compared.

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