ASCSM-26.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-26.000MHZ-LR-T is a 26 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 listed as Obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs requiring 26 MHz oscillation at reduced supply voltage specifications.

Substiute Parts

ASCSM-26.000MHZ-LR-T

Abracon LLCIn Stock: 1215ASCSM-26.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-26.000MHZ-L-T3

Abracon LLCIn Stock: 1249ASCO-26.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The ASCO-26.000MHZ-L-T3 qualifies as a functional substitute based on the following alignment criteria:

Matching Parameters:

• Frequency: 26 MHz (exact match)
• Output Type: CMOS (exact match)
• Function: Enable/Disable (exact match)
• Operating Temperature Range: -40°C ~ 85°C (exact match)
• RoHS Compliance: ROHS3 Compliant (exact match)
• REACH Status: REACH Unaffected (exact match)

Substitution Constraints: The ASCO-26.000MHZ-L-T3 operates at a fixed 3.3V supply voltage, whereas the ASCSM-26.000MHZ-LR-T supports 1.7V to 3.6V. This substitution is valid only for applications where the system supply voltage is 3.3V. The ASCO variant uses crystal-based resonator technology instead of MEMS, with relaxed frequency stability (±50ppm vs. ±25ppm) and different packaging (4-SMD, No Lead vs. 4-UFBGA, CSPBGA).

Parameter Comparison

Engineering Selection Recommendations

The ASCO-26.000MHZ-L-T3 is suitable as a substitute for the obsolete ASCSM-26.000MHZ-LR-T under the following conditions:

• System supply voltage is fixed at 3.3V
• Frequency stability tolerance of ±50ppm is acceptable for the application
• PCB layout accommodates the 4-SMD, No Lead package format
• Crystal-based resonator performance meets application requirements

Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The ASCO variant is currently in active production status, providing supply chain continuity for the obsolete ASCSM model.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-26.000MHZ-L-T3 replace the ASCSM-26.000MHZ-LR-T in all applications?

A: No. The ASCO variant is limited to 3.3V operation. Substitution is valid only if your system operates at 3.3V supply voltage. The ASCSM supports 1.7V to 3.6V, providing broader voltage compatibility.

Q: What is the difference between MEMS and crystal-based oscillators?

A: The ASCSM uses MEMS (Micro-Electro-Mechanical Systems) resonator technology, while the ASCO uses a crystal resonator. Both generate 26 MHz output with CMOS logic levels. The MEMS variant offers tighter frequency stability (±25ppm) compared to the crystal variant (±50ppm).

Q: Are the packages compatible?

A: No. The ASCSM uses 4-UFBGA or CSPBGA packaging, while the ASCO uses 4-SMD, No Lead packaging. PCB footprints differ and require separate design layouts.

Q: Does the ASCO-26.000MHZ-L-T3 support the same Enable/Disable functionality?

A: Yes. Both parts provide Enable/Disable control functionality for power management applications.

Q: What are the compliance differences?

A: Both parts are ROHS3 compliant and REACH unaffected. The ASCSM has MSL 1 (Unlimited) moisture sensitivity, while the ASCO has Not Applicable MSL rating, indicating different handling requirements during storage and assembly.