ASCSM-14.31818MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-14.31818MHZ-LR-T is a 14.31818 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 part is classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs requiring this frequency specification.

Key Parameters

Parameter	Value
Frequency	14.31818 MHz
Base Resonator Type	MEMS
Output Type	CMOS
Supply Voltage Range	1.7V ~ 3.6V
Frequency Stability	±25ppm
Operating Temperature	-40°C ~ 85°C
Function	Enable/Disable
Package Type	4-UFBGA, CSPBGA
Maximum Supply Current	6.5mA
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the ASCSM-14.31818MHZ-LR-T is determined by the following critical parameters:

Frequency Match: 14.31818 MHz (exact frequency required for system timing)
Output Type: CMOS (functional compatibility with receiving circuits)
Function: Enable/Disable capability (system control requirement)
Operating Temperature Range: -40°C ~ 85°C (environmental specification)
RoHS3 Compliance: Required for regulatory alignment

The ASCO-14.31818MHZ-L-T3 meets these core substitution criteria. However, differences exist in base resonator technology (Crystal vs. MEMS), supply voltage range, frequency stability, and package configuration. These differences must be evaluated against specific application requirements.

Parameter Comparison

Parameter	ASCSM-14.31818MHZ-LR-T (Main)	ASCO-14.31818MHZ-L-T3 (Substitute)
Manufacturer	Abracon LLC	Abracon LLC
Frequency	14.31818 MHz	14.31818 MHz
Base Resonator	MEMS	Crystal
Output Type	CMOS	CMOS
Supply Voltage	1.7V ~ 3.6V	3.3V
Frequency Stability	±25ppm	±50ppm
Function	Enable/Disable	Enable/Disable
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Maximum Supply Current	6.5mA	4.5mA
Disable Mode Current	15µA	Not Specified
Package Type	4-UFBGA, CSPBGA	4-SMD, No Lead
Size (L x W)	0.070" x 0.049" (1.79mm x 1.25mm)	0.063" x 0.047" (1.60mm x 1.20mm)
Height (Max)	0.027" (0.69mm)	0.028" (0.70mm)
Product Status	Obsolete	Active
RoHS3 Compliance	Yes	Yes

Engineering Selection Recommendations

The ASCO-14.31818MHZ-L-T3 serves as a functional substitute for the obsolete ASCSM-14.31818MHZ-LR-T based on the following factors:

Compatibility Factors:

Both parts deliver identical frequency output (14.31818 MHz) with CMOS signaling
Both support Enable/Disable control functionality
Both operate across the full -40°C to 85°C temperature range
Both maintain RoHS3 compliance and REACH unaffected status

Substitution Constraints:

The substitute operates at fixed 3.3V supply, whereas the main part accepts 1.7V to 3.6V. Applications requiring operation below 3.0V or above 3.6V cannot use this substitute without voltage regulation modifications
Frequency stability degrades from ±25ppm to ±50ppm. Applications with tight frequency tolerance requirements must validate this specification against system performance margins
Package transition from 4-UFBGA/CSPBGA to 4-SMD No Lead requires PCB layout redesign and requalification
Active product status of the substitute ensures long-term availability and supply chain continuity

Frequently Asked Questions (FAQ)

Q: Can the ASCO-14.31818MHZ-L-T3 directly replace the ASCSM-14.31818MHZ-LR-T without design changes?

A: Direct replacement is not possible due to package type differences (4-UFBGA/CSPBGA vs. 4-SMD No Lead). PCB layout and footprint modifications are required. Additionally, the fixed 3.3V supply specification differs from the original 1.7V to 3.6V range.

Q: What is the impact of the frequency stability difference (±25ppm vs. ±50ppm)?

A: The substitute exhibits twice the frequency tolerance. Applications sensitive to frequency drift, such as precision timing or narrowband communication systems, must verify that ±50ppm stability remains within acceptable performance limits.

Q: Is the substitute suitable for low-voltage applications below 3.0V?

A: No. The ASCO-14.31818MHZ-L-T3 operates at fixed 3.3V supply. Applications requiring operation at 1.7V to 3.0V cannot use this substitute without external voltage regulation.

Q: What are the package footprint differences?

A: The main part uses 4-UFBGA or CSPBGA packages (1.79mm x 1.25mm), while the substitute uses 4-SMD No Lead (1.60mm x 1.20mm). Physical dimensions are similar, but pad layout and soldering requirements differ significantly.

Q: Does the substitute provide equivalent disable mode current performance?

A: The main part specifies 15µA disable mode current. The substitute does not provide this specification. Disable mode current characteristics must be confirmed with the manufacturer for power management applications.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both parts are RoHS3 compliant, REACH unaffected, and classified under ECCN EAR99 and HTSUS 8542.39.0001.

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