ASCSM-75.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-75.000MHZ-LR-T is a 75 MHz MEMS-based XO (Standard) CMOS oscillator manufactured by Abracon LLC. This component operates across a wide supply voltage range of 1.7V to 3.6V with Enable/Disable functionality, housed in a compact 4-UFBGA/CSPBGA package measuring 1.79mm × 1.25mm. The product is classified as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

Substiute Parts

ASCSM-75.000MHZ-LR-T

Abracon LLCIn Stock: 776ASCSM-75.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-75.000MHZ-L-T3

Abracon LLCIn Stock: 1071ASCO-75.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-75.000MHZ-LR-T is determined by the following critical parameters:

• Frequency Match: 75 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)
• Supply Voltage Compatibility: Substitute must operate within or encompass the original 1.7V ~ 3.6V range
• Frequency Stability: Substitute stability must meet or exceed ±25ppm specification
• Package Compatibility: Surface mount packages with compatible footprints and pinouts
• Regulatory Compliance: ROHS3 and REACH compliance maintained

The ASCO-75.000MHZ-L-T3 qualifies as a substitute based on matching frequency, output type, function, operating temperature, and regulatory compliance. However, the supply voltage range differs (3.3V fixed versus 1.7V ~ 3.6V range), and frequency stability is relaxed (±50ppm versus ±25ppm).

Parameter Comparison

Engineering Selection Recommendations

The ASCO-75.000MHZ-L-T3 is available as an Active product from Abracon LLC, providing supply continuity for the Obsolete ASCSM-75.000MHZ-LR-T. Both components maintain ROHS3 and REACH compliance, ensuring regulatory alignment.

Selection of the ASCO-75.000MHZ-L-T3 requires verification that the following parameter differences are acceptable for the target application:

• Supply voltage is fixed at 3.3V rather than the original 1.7V ~ 3.6V range
• Frequency stability is ±50ppm versus the original ±25ppm specification
• Maximum supply current increases from 6.5mA to 8.5mA
• Package transitions from 4-UFBGA/CSPBGA to 4-SMD No Lead format
• Base resonator technology changes from MEMS to Crystal

Frequently Asked Questions (FAQ)

Q: Can the ASCO-75.000MHZ-L-T3 directly replace the ASCSM-75.000MHZ-LR-T?

A: Direct replacement requires confirmation that the application can operate at a fixed 3.3V supply voltage and accept the relaxed ±50ppm frequency stability. The package footprint differs between 4-UFBGA/CSPBGA and 4-SMD No Lead, necessitating PCB layout verification.

Q: What is the primary difference between these two oscillators?

A: The main part uses MEMS resonator technology with a wide supply voltage range (1.7V ~ 3.6V), while the substitute uses crystal resonator technology with fixed 3.3V operation. The MEMS-based part offers tighter frequency stability (±25ppm) and lower supply current (6.5mA max).

Q: Are both parts RoHS and REACH compliant?

A: Yes, both the ASCSM-75.000MHZ-LR-T and ASCO-75.000MHZ-L-T3 are ROHS3 Compliant and REACH Unaffected.

Q: What is the package compatibility consideration?

A: The original part uses a 4-UFBGA/CSPBGA package (1.79mm × 1.25mm), while the substitute uses 4-SMD No Lead (1.60mm × 1.20mm). Although dimensions are similar, the package types differ, requiring PCB footprint and assembly process verification.

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

A: Yes, the ASCO-75.000MHZ-L-T3 includes Enable/Disable functionality matching the original part.

Q: What is the frequency stability difference impact?

A: The original part specifies ±25ppm frequency stability, while the substitute specifies ±50ppm. Applications requiring tighter frequency tolerance must evaluate whether the relaxed specification is acceptable.