ASCSM-76.800MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-76.800MHZ-LR-T is a 76.8 MHz MEMS-based XO (Standard) oscillator manufactured by Abracon LLC, designed for applications requiring low-voltage operation across 1.7V to 3.6V supply ranges. This part features CMOS output with Enable/Disable functionality in a compact 4-UFBGA/CSPBGA package. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

Substiute Parts

ASCSM-76.800MHZ-LR-T

Abracon LLCIn Stock: 859ASCSM-76.800MHZ-LR-T Datasheet

Current PartRFQ

ASCO-76.800MHZ-L-T3

Abracon LLCIn Stock: 1082ASCO-76.800MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-76.800MHZ-LR-T requires matching the following critical parameters:

• Frequency: 76.8 MHz (exact match required)
• Output Type: CMOS
• Function: Enable/Disable capability
• Operating Temperature Range: -40°C ~ 85°C minimum
• RoHS Compliance: ROHS3 Compliant
• Mounting Type: Surface Mount

The ASCO-76.800MHZ-L-T3 qualifies as a substitute based on matching frequency, CMOS output, Enable/Disable function, operating temperature range, and RoHS compliance. However, differences in base resonator technology (Crystal vs. MEMS), voltage supply range, frequency stability, and package configuration must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-76.800MHZ-L-T3 is available as an active product from Abracon LLC and maintains ROHS3 compliance, making it suitable for applications where the ASCSM-76.800MHZ-LR-T is no longer procurable. Both parts share identical frequency, CMOS output, Enable/Disable function, and operating temperature specifications.

Selection of the ASCO-76.800MHZ-L-T3 requires verification that the following differences are acceptable for the target application:

• Voltage supply is fixed at 3.3V (versus 1.7V ~ 3.6V range of the main part)
• Frequency stability is ±50ppm (versus ±25ppm of the main part)
• Package configuration changes from 4-UFBGA/CSPBGA to 4-SMD, No Lead
• Maximum supply current increases to 8.5mA (versus 6.5mA of the main part)
• Base resonator technology changes from MEMS to Crystal

Frequently Asked Questions (FAQ)

Q: Can the ASCO-76.800MHZ-L-T3 directly replace the ASCSM-76.800MHZ-LR-T without PCB modifications?

A: No. The package types differ (4-UFBGA/CSPBGA versus 4-SMD, No Lead), requiring PCB layout and footprint changes. Physical dimensions are similar but not identical.

Q: What is the impact of the voltage supply difference?

A: The ASCO-76.800MHZ-L-T3 operates at fixed 3.3V, whereas the main part supports 1.7V to 3.6V. Applications requiring operation below 3.3V or with variable supply voltages cannot use this substitute without additional voltage regulation.

Q: How does the frequency stability difference affect system performance?

A: The ASCO-76.800MHZ-L-T3 has ±50ppm stability versus ±25ppm for the main part. Applications with tight frequency tolerance requirements must evaluate whether the reduced stability is acceptable.

Q: Why does the substitute use Crystal resonator technology instead of MEMS?

A: Crystal-based oscillators offer different performance characteristics, including frequency stability and temperature behavior. The ASCO series represents Abracon's crystal-based alternative in the same frequency range.

Q: Is the disable current specification important for low-power applications?

A: Yes. The main part specifies 15µA disable current; the substitute does not provide this specification. Applications requiring precise low-power standby current budgeting must obtain this data from the manufacturer.