ASCSM-33.333MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-33.333MHZ-LR-T is a 33.333 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 equivalent alternatives for ongoing design requirements and production continuity.

Key Parameters

Parameter	Value
Frequency	33.333 MHz
Base Resonator	MEMS
Output Type	CMOS
Supply Voltage Range	1.7V ~ 3.6V
Frequency Stability	±25ppm
Operating Temperature	-40°C ~ 85°C
Maximum Supply Current	6.5mA
Package Type	4-UFBGA, CSPBGA
Dimensions	0.070" L x 0.049" W (1.79mm x 1.25mm)
Maximum Height	0.027" (0.69mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the ASCSM-33.333MHZ-LR-T is determined by the following critical parameters:

Frequency match: 33.333 MHz (exact)
Output type: CMOS
Function: Enable/Disable capability
Operating temperature range: Minimum -40°C to maximum 85°C
RoHS and REACH compliance status
Physical package compatibility with PCB layout constraints

The substitute parts identified maintain the core frequency and functional requirements. However, variations exist in base resonator technology (Crystal vs. MEMS), supply voltage specifications, frequency stability, and physical package dimensions. These differences require engineering evaluation based on specific application requirements.

Parameter Comparison

Parameter	ASCSM-33.333MHZ-LR-T (Main)	ASCO-33.333MHZ-L-T3	7C-33.3330MDA-T
Manufacturer	Abracon LLC	Abracon LLC	TXC CORPORATION
Frequency	33.333 MHz	33.333 MHz	33.333 MHz
Base Resonator	MEMS	Crystal	Crystal
Output Type	CMOS	CMOS	CMOS
Supply Voltage	1.7V ~ 3.6V	3.3V	1.8V
Frequency Stability	±25ppm	±50ppm	±25ppm
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-10°C ~ 70°C
Maximum Supply Current	6.5mA	6mA	20mA
Package Type	4-UFBGA, CSPBGA	4-SMD, No Lead	4-SMD, No Lead
Dimensions	0.070" L x 0.049" W (1.79mm x 1.25mm)	0.063" L x 0.047" W (1.60mm x 1.20mm)	0.197" L x 0.126" W (5.00mm x 3.20mm)
Maximum Height	0.027" (0.69mm)	0.028" (0.70mm)	0.055" (1.40mm)
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant

Engineering Selection Recommendations

ASCO-33.333MHZ-L-T3 (Abracon LLC): This substitute maintains ROHS3 compliance and active product status. It provides equivalent operating temperature range (-40°C to 85°C) and comparable supply current (6mA vs. 6.5mA). The primary limitation is fixed 3.3V supply voltage specification versus the main part's 1.7V to 3.6V range. Frequency stability is ±50ppm compared to ±25ppm. Package dimensions are similar (1.60mm x 1.20mm vs. 1.79mm x 1.25mm), supporting space-constrained applications. This option is suitable for designs with 3.3V supply rails and tolerance for reduced frequency stability.

7C-33.3330MDA-T (TXC CORPORATION): This substitute offers active product status and RoHS compliance. Frequency stability matches the main part at ±25ppm. The 1.8V supply voltage accommodates lower-voltage applications within the original part's range. Operating temperature range is restricted to -10°C to 70°C, narrower than the main part's -40°C to 85°C specification. Maximum supply current is significantly higher at 20mA. Physical dimensions are substantially larger (5.00mm x 3.20mm), requiring PCB layout reconsideration. This option is applicable for designs with 1.8V supply requirements and standard temperature operating conditions.

Frequently Asked Questions (FAQ)

Q: Can ASCO-33.333MHZ-L-T3 directly replace ASCSM-33.333MHZ-LR-T in all applications?

A: Direct replacement requires verification of supply voltage compatibility. The ASCO operates at fixed 3.3V, while the main part supports 1.7V to 3.6V. If your design uses 3.3V supply, this substitute is compatible. If your design requires operation below 3.0V or above 3.6V, this substitute is not suitable. Frequency stability difference (±50ppm vs. ±25ppm) must be evaluated against application timing requirements.

Q: What are the package compatibility implications?

A: The main part uses 4-UFBGA/CSPBGA package (1.79mm x 1.25mm x 0.69mm height). ASCO-33.333MHZ-L-T3 uses 4-SMD No Lead package (1.60mm x 1.20mm x 0.70mm height), which is physically similar and suitable for comparable PCB footprints. The 7C-33.3330MDA-T uses 4-SMD No Lead package (5.00mm x 3.20mm x 1.40mm height), which requires significantly different PCB layout and is not suitable for space-constrained designs.

Q: How does operating temperature range affect substitution?

A: The main part operates -40°C to 85°C. ASCO-33.333MHZ-L-T3 maintains this range. The 7C-33.3330MDA-T is limited to -10°C to 70°C. If your application requires operation below -10°C or above 70°C, the 7C part is not suitable.

Q: What is the significance of MEMS versus Crystal resonator technology?

A: The main part uses MEMS technology; both substitutes use Crystal technology. This is a resonator architecture difference, not a functional incompatibility. Both technologies deliver CMOS output at the specified frequency with Enable/Disable control.

Q: Are there supply current implications for power budget calculations?

A: The main part draws maximum 6.5mA. ASCO-33.333MHZ-L-T3 draws 6mA (lower). The 7C-33.3330MDA-T draws 20mA (significantly higher). If power consumption is critical, the ASCO option is preferable. The 7C option requires power budget reassessment.

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