ASCSM-66.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-66.000MHZ-LR-T is a 66 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 packaged in a 4-UFBGA, CSPBGA configuration with compact dimensions of 1.79mm × 1.25mm.

This part has reached Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for production and maintenance applications.

Key Parameters

Parameter	Value
Frequency	66 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
Disable Mode Current	15µA
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the ASCSM-66.000MHZ-LR-T are identified based on the following critical parameters that determine functional compatibility:

Core Matching Criteria:

Frequency: 66 MHz (exact match required)
Output Type: CMOS (exact match required)
Function: Enable/Disable capability (exact match required)
Operating Temperature Range: -40°C ~ 85°C (exact match required)
Frequency Stability: ±25ppm or better (equal or tighter tolerance acceptable)
Supply Voltage Compatibility: Substitute must operate within or encompass the original 1.7V ~ 3.6V range

Acceptable Variations:

Base Resonator Type: MEMS or Crystal resonator technology acceptable if all electrical parameters are met
Package Type: Different surface mount packages acceptable if board layout permits
Supply Current: Higher current consumption acceptable if power budget permits
Disable Mode Current: Variation acceptable based on application requirements

Parameter Comparison

Parameter	ASCSM-66.000MHZ-LR-T (Main)	ASCO-66.000MHZ-L-T3 (Substitute)	DSC1121CI2-066.0000 (Substitute)
Manufacturer	Abracon LLC	Abracon LLC	Microchip Technology
Frequency	66 MHz	66 MHz	66 MHz
Base Resonator	MEMS	Crystal	MEMS
Output Type	CMOS	CMOS	CMOS
Supply Voltage	1.7V ~ 3.6V	3.3V	2.25V ~ 3.6V
Frequency Stability	±25ppm	±50ppm	±25ppm
Function	Enable/Disable	Enable/Disable	Enable/Disable
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Max Supply Current	6.5mA	8.5mA	35mA
Disable Mode Current	15µA	Not Specified	22mA
Package Type	4-UFBGA, CSPBGA	4-SMD, No Lead	6-SMD, No Lead
Package Dimensions	1.79mm × 1.25mm	1.60mm × 1.20mm	3.20mm × 2.50mm
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

ASCO-66.000MHZ-L-T3 (Abracon LLC)

This substitute maintains the same manufacturer lineage and shares identical frequency, output type, and Enable/Disable functionality. The crystal-based resonator provides ±50ppm stability, which is looser than the original ±25ppm specification. The supply voltage is fixed at 3.3V, which is within the original operating range but does not support the lower 1.7V minimum. This part is suitable for applications where 3.3V supply is available and the relaxed frequency stability is acceptable. Active product status ensures long-term availability.

DSC1121CI2-066.0000 (Microchip Technology)

This substitute is the manufacturer-recommended alternative and provides MEMS-based resonator technology matching the original part's ±25ppm frequency stability. The supply voltage range of 2.25V to 3.6V encompasses most of the original range but does not support operation below 2.25V. The 6-SMD package is larger than the original 4-UFBGA configuration, requiring board layout verification. Maximum supply current of 35mA is significantly higher than the original 6.5mA, necessitating power budget review. AEC-Q100 automotive qualification is included. Active product status and Microchip's established market position support long-term component availability.

Frequently Asked Questions (FAQ)

Q: Can ASCO-66.000MHZ-L-T3 be used as a direct replacement for ASCSM-66.000MHZ-LR-T?

A: ASCO-66.000MHZ-L-T3 is functionally compatible for applications operating at 3.3V supply voltage. The frequency, output type, and Enable/Disable function are identical. However, the fixed 3.3V supply does not support the original part's 1.7V minimum specification. Frequency stability is ±50ppm versus the original ±25ppm. Board layout compatibility must be verified due to different package types.

Q: Why is DSC1121CI2-066.0000 recommended despite higher current consumption?

A: DSC1121CI2-066.0000 is the manufacturer-recommended substitute because it maintains MEMS resonator technology and ±25ppm frequency stability matching the original specification. The higher 35mA supply current is a trade-off for active product status and long-term availability. Applications with adequate power budgets benefit from this part's automotive qualification and established supply chain.

Q: What are the package compatibility considerations?

A: The original ASCSM-66.000MHZ-LR-T uses 4-UFBGA, CSPBGA packaging (1.79mm × 1.25mm). ASCO-66.000MHZ-L-T3 uses 4-SMD, No Lead (1.60mm × 1.20mm), and DSC1121CI2-066.0000 uses 6-SMD, No Lead (3.20mm × 2.50mm). Physical board layout must accommodate the substitute package footprint and height.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both ASCO-66.000MHZ-L-T3 and DSC1121CI2-066.0000 are ROHS3 compliant, matching the original part's environmental compliance status.

Q: What is the minimum supply voltage requirement for each part?

A: ASCSM-66.000MHZ-LR-T operates from 1.7V minimum. ASCO-66.000MHZ-L-T3 requires 3.3V fixed supply. DSC1121CI2-066.0000 operates from 2.25V minimum. Applications requiring sub-2.25V operation must use the original part or identify alternative sources.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message