ASCSM-19.440MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-19.440MHZ-LR-T is a 19.44 MHz MEMS-based XO (Standard) oscillator manufactured by Abracon LLC. This Pure Silicon™ series component operates across a wide supply voltage range of 1.7V to 3.6V with CMOS output and Enable/Disable functionality. The device is housed in a compact 4-UFBGA/CSPBGA package measuring 1.79mm × 1.25mm with a maximum seated height of 0.69mm.

The ASCSM-19.440MHZ-LR-T has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this frequency and electrical specification.

Substiute Parts

ASCSM-19.440MHZ-LR-T

Abracon LLCIn Stock: 1134ASCSM-19.440MHZ-LR-T Datasheet

Current PartRFQ

ASCO-19.440MHZ-L-T3

Abracon LLCIn Stock: 1090ASCO-19.440MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-19.440MHZ-LR-T is evaluated based on the following critical parameters:

• Frequency Match: 19.44 MHz (exact match required)
• Output Type: CMOS (exact match required)
• Enable/Disable Function: Present (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• Frequency Stability: ±25ppm or better (tighter tolerance acceptable)
• Supply Voltage Compatibility: Substitute must operate within or encompass the 1.7V ~ 3.6V range
• Package Type: Surface mount with compatible footprint and height profile
• Compliance: RoHS3 and REACH compliance maintained

The ASCO-19.440MHZ-L-T3 qualifies as a substitute based on matching frequency, output type, function, and operating temperature range. However, key differences exist in resonator technology, supply voltage specification, frequency stability, and package configuration that must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-19.440MHZ-L-T3 is an active product from Abracon LLC and maintains full RoHS3 and REACH compliance, making it suitable for new designs and ongoing production support. The substitute part preserves the core functional requirements: 19.44 MHz frequency, CMOS output, Enable/Disable capability, and -40°C to 85°C operating temperature range.

Critical differences requiring evaluation:

• Resonator Technology: The substitute uses crystal-based resonance versus MEMS in the original part. This affects frequency stability (±50ppm versus ±25ppm) and may impact long-term frequency drift characteristics.
• Supply Voltage Specification: The substitute is specified for 3.3V operation only, whereas the original supports 1.7V to 3.6V. Applications requiring operation below 3.0V or above 3.6V cannot use this substitute.
• Package Configuration: The substitute uses 4-SMD No Lead packaging versus 4-UFBGA/CSPBGA. PCB footprint and reflow profile compatibility must be verified.
• Supply Current: The substitute draws 4.5mA maximum versus 6.5mA, representing improved power efficiency.

Selection of the ASCO-19.440MHZ-L-T3 is appropriate for applications where 3.3V supply voltage is available, ±50ppm frequency stability is acceptable, and the 4-SMD No Lead package is compatible with existing PCB design and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-19.440MHZ-L-T3 directly replace the ASCSM-19.440MHZ-LR-T in existing designs?

A: Direct replacement requires verification of three factors: (1) supply voltage must be 3.3V or capable of being adjusted to 3.3V; (2) PCB footprint must accommodate 4-SMD No Lead package instead of 4-UFBGA/CSPBGA; (3) frequency stability of ±50ppm must meet application timing requirements. If all three conditions are satisfied, substitution is feasible.

Q: What is the impact of the frequency stability difference between ±25ppm and ±50ppm?

A: Frequency stability defines the maximum deviation from the nominal 19.44 MHz frequency across the operating temperature range and supply voltage variations. The original part guarantees tighter tolerance (±25ppm), while the substitute allows twice the deviation (±50ppm). Applications with stringent frequency accuracy requirements may be affected. Evaluate your system's tolerance for frequency drift before substitution.

Q: Are the package dimensions compatible?

A: The packages are similar in footprint (1.79mm × 1.25mm versus 1.60mm × 1.20mm) and height (0.69mm versus 0.70mm), but the package types differ fundamentally. The original uses ball grid array (UFBGA/CSPBGA) while the substitute uses surface mount with no leads (4-SMD). PCB layout, solder pad design, and reflow profile must be re-evaluated. Physical compatibility cannot be assumed.

Q: Does the substitute support the same voltage range as the original?

A: No. The original part operates from 1.7V to 3.6V, while the substitute is specified for 3.3V only. If your application requires operation at voltages outside the 3.3V specification, the ASCO-19.440MHZ-L-T3 is not suitable.

Q: What are the compliance and availability advantages of the substitute?

A: The ASCO-19.440MHZ-L-T3 is an active product with confirmed inventory availability, whereas the original is obsolete. Both parts maintain RoHS3 and REACH compliance. Active product status ensures continued manufacturing support, documented specifications, and supply chain reliability for future production runs.