ASCSM-33.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-33.000MHZ-LR-T is a 33 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-33.000MHZ-LR-T

Abracon LLCIn Stock: 692ASCSM-33.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-33.000MHZ-L-T3

Abracon LLCIn Stock: 991ASCO-33.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ASCSM-33.000MHZ-LR-T is determined by the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 33 MHz
• Output Type: CMOS
• Function: Enable/Disable
• Operating Temperature Range: -40°C ~ 85°C
• Mounting Type: Surface Mount
• RoHS Compliance: ROHS3 Compliant

Allowable Variation Parameters:

• Base Resonator: MEMS or Crystal (both acceptable for XO standard oscillators)
• Voltage Supply Range: Substitute must support minimum 3.3V operation; wider ranges acceptable
• Frequency Stability: Substitute may have relaxed tolerance (±50ppm acceptable vs. ±25ppm)
• Current Supply: Substitute specifications within ±10% acceptable
• Package Form Factor: 4-SMD, No Lead acceptable as functional equivalent to 4-UFBGA/CSPBGA
• Physical Dimensions: Minor variations acceptable within standard PCB assembly tolerances

The ASCO-33.000MHZ-L-T3 qualifies as a direct substitute based on matching all mandatory parameters while maintaining functional equivalence despite resonator technology and package form factor differences.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-33.000MHZ-L-T3 is the qualified substitute for the obsolete ASCSM-33.000MHZ-LR-T based on the following engineering criteria:

Product Status Alignment: The substitute part maintains Active product status with Abracon LLC, ensuring long-term availability and manufacturing support compared to the Obsolete main part.

Regulatory Compliance: Both parts maintain ROHS3 Compliance and REACH Unaffected status, satisfying equivalent environmental and regulatory requirements for industrial and commercial applications.

Functional Equivalence: The substitute delivers identical 33 MHz CMOS output with Enable/Disable functionality across the required -40°C to 85°C operating temperature range. Both parts are manufactured by the same supplier, ensuring design consistency and supply chain continuity.

Voltage Supply Consideration: The substitute operates at fixed 3.3V supply versus the main part's 1.7V to 3.6V range. Systems designed for 3.3V operation experience no functional impact. Systems requiring sub-3.3V operation require alternative component evaluation.

Frequency Stability Trade-off: The substitute exhibits ±50ppm stability versus the main part's ±25ppm. Applications with strict frequency tolerance requirements must evaluate this specification against system-level clock accuracy needs.

Package Form Factor: The 4-SMD, No Lead package is functionally equivalent to 4-UFBGA/CSPBGA for PCB assembly and electrical performance. Footprint dimensions differ marginally (1.60mm × 1.20mm vs. 1.79mm × 1.25mm), remaining within standard assembly tolerances for 33 MHz oscillator applications.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-33.000MHZ-L-T3 directly replace the ASCSM-33.000MHZ-LR-T in existing designs?

A: Direct replacement is possible for systems operating at 3.3V supply voltage. The substitute maintains identical frequency, output type, function, and operating temperature range. PCB footprint adjustment may be required due to package form factor differences (4-SMD, No Lead vs. 4-UFBGA/CSPBGA). Systems requiring supply voltages below 3.3V require alternative component selection.

Q: What is the impact of the frequency stability difference (±25ppm vs. ±50ppm)?

A: The substitute's ±50ppm stability is acceptable for standard 33 MHz clock applications including microcontroller timing, data communication interfaces, and general-purpose timing circuits. Applications requiring precision frequency control within ±25ppm must evaluate whether the relaxed tolerance affects system performance specifications.

Q: Are there package compatibility concerns between 4-UFBGA/CSPBGA and 4-SMD, No Lead?

A: Both packages are surface-mount technologies with comparable footprint dimensions and height profiles (0.69mm vs. 0.70mm seated height). PCB layout modifications are necessary to accommodate the different package geometries. Assembly equipment compatibility should be confirmed with manufacturing partners.

Q: Does the substitute support the same disable current specification?

A: The main part specifies 15µA maximum disable current. The substitute does not provide a disable current specification. Systems requiring documented disable current performance should confirm this parameter with the manufacturer or evaluate alternative components.

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

A: Both MEMS and Crystal resonators deliver equivalent XO (Standard) oscillator performance at 33 MHz. The technology difference does not affect functional compatibility, frequency output, or CMOS signal integrity for this application category.

Q: Are both parts suitable for industrial temperature range applications?

A: Yes. Both the main part and substitute operate across the -40°C to 85°C temperature range, meeting industrial-grade specifications for temperature stability and reliability.