ASCSM-37.400MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-37.400MHZ-LR-T is a 37.4 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 currently obsolete, necessitating identification of functionally equivalent alternatives that maintain core performance characteristics while meeting current application requirements.

Key Parameters

Parameter	Value
Frequency	37.4 MHz
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
Mounting Type	Surface Mount
Current Supply (Max)	6.5mA
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the ASCSM-37.400MHZ-LR-T is determined by the following critical parameters:

Frequency match: 37.4 MHz (exact)
Output configuration: CMOS
Enable/Disable functionality: Required
Operating temperature range: Minimum -40°C ~ 85°C
RoHS3 compliance: Required
Surface mount packaging: Required

The identified substitute parts maintain the 37.4 MHz frequency and CMOS output while operating within compatible voltage and temperature specifications. Both alternatives are manufactured by Abracon LLC and carry active product status with current inventory availability.

Parameter Comparison

Parameter	ASCSM-37.400MHZ-LR-T (Main)	ASCO-37.400MHZ-L-T3	ASCO2-37.400MHZ-EK-T3
Manufacturer	Abracon LLC	Abracon LLC	Abracon LLC
Frequency	37.4 MHz	37.4 MHz	37.4 MHz
Output Type	CMOS	CMOS	CMOS
Supply Voltage	1.7V ~ 3.6V	3.3V	1.8V
Frequency Stability	±25ppm	±50ppm	±30ppm
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-20°C ~ 70°C
Function	Enable/Disable	Enable/Disable	Enable/Disable
Current Supply (Max)	6.5mA	6mA	4.6mA
Package / Case	4-UFBGA, CSPBGA	4-SMD, No Lead	4-SMD, No Lead
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

ASCO-37.400MHZ-L-T3 is suitable for applications requiring 3.3V supply operation with standard frequency stability tolerance. This part maintains the full -40°C to 85°C operating range and delivers equivalent current performance. Active product status ensures long-term availability and supply chain continuity.

ASCO2-37.400MHZ-EK-T3 is recommended for applications with 1.8V supply requirements and reduced power consumption needs. This part offers improved frequency stability at ±30ppm and lower maximum supply current of 4.6mA. Operating temperature range is limited to -20°C to 70°C, requiring verification against application thermal requirements. Active product status and RoHS3 compliance support production deployment.

Both substitute parts employ crystal-based resonators compared to the MEMS technology of the original part. Package transition from 4-UFBGA/CSPBGA to 4-SMD No Lead requires PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can ASCO-37.400MHZ-L-T3 directly replace ASCSM-37.400MHZ-LR-T?

A: Functional replacement is possible for applications operating at 3.3V supply. The substitute maintains 37.4 MHz frequency, CMOS output, Enable/Disable function, and -40°C to 85°C temperature range. Package change from 4-UFBGA/CSPBGA to 4-SMD No Lead requires PCB redesign. Frequency stability degrades from ±25ppm to ±50ppm.

Q: What are the voltage compatibility constraints?

A: The original part operates across 1.7V to 3.6V. ASCO-37.400MHZ-L-T3 requires fixed 3.3V operation. ASCO2-37.400MHZ-EK-T3 operates at 1.8V. Applications requiring the full 1.7V to 3.6V range cannot use either substitute without voltage regulation modifications.

Q: How does frequency stability affect system performance?

A: Original specification is ±25ppm. ASCO-37.400MHZ-L-T3 provides ±50ppm, while ASCO2-37.400MHZ-EK-T3 provides ±30ppm. Applications with tight frequency tolerance requirements must evaluate whether the substitute stability meets system specifications.

Q: Are there temperature range limitations?

A: Original part and ASCO-37.400MHZ-L-T3 both support -40°C to 85°C. ASCO2-37.400MHZ-EK-T3 is limited to -20°C to 70°C. Applications requiring full -40°C operation must use ASCO-37.400MHZ-L-T3 or verify that ASCO2 variant meets actual deployment conditions.

Q: What is the impact of package change?

A: Original 4-UFBGA/CSPBGA package differs from 4-SMD No Lead used in both substitutes. Physical dimensions are similar (approximately 1.6mm x 1.2mm), but PCB footprint, solder reflow profile, and assembly process require modification. Mechanical compatibility must be verified during design transition.

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