ASCSM-70.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-70.000MHZ-LR-T is a 70 MHz MEMS-based XO (Standard) oscillator manufactured by Abracon LLC, featuring CMOS output with Enable/Disable functionality. This component operates across a wide supply voltage range of 1.7V to 3.6V and is housed in a compact 4-UFBGA/CSPBGA package measuring 1.79mm × 1.25mm. The product is currently obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

Substiute Parts

ASCSM-70.000MHZ-LR-T

Abracon LLCIn Stock: 1175ASCSM-70.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-70.000MHZ-L-T3

Abracon LLCIn Stock: 1135ASCO-70.000MHZ-L-T3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ASCSM-70.000MHZ-LR-T is determined by the following critical parameters:

• Frequency Match: 70 MHz (exact match required)
• Output Type: CMOS (mandatory for signal compatibility)
• Function: Enable/Disable capability (required for power management)
• Operating Temperature Range: -40°C ~ 85°C (must meet or exceed)
• Mounting Type: Surface Mount (PCB integration requirement)
• Compliance: ROHS3 and REACH compliance (regulatory requirement)

The ASCO-70.000MHZ-L-T3 qualifies as a substitute based on matching frequency, CMOS output, Enable/Disable function, identical operating temperature range, surface mount packaging, and equivalent compliance certifications. However, differences in resonator technology (Crystal vs. MEMS), supply voltage range, frequency stability, and package form factor must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ASCO-70.000MHZ-L-T3 is an active product from the same manufacturer, ensuring continued availability and support. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements.

Key considerations for substitution:

• Supply Voltage: The substitute operates at fixed 3.3V, whereas the original supports 1.7V to 3.6V. Designs requiring operation below 3.3V cannot use this substitute.
• Frequency Stability: The substitute exhibits ±50ppm stability compared to the original's ±25ppm. Applications with tight frequency tolerance requirements must evaluate this difference.
• Resonator Technology: The substitute uses crystal-based resonance instead of MEMS. This affects long-term stability and shock/vibration performance characteristics.
• Package Form Factor: The substitute uses 4-SMD No Lead packaging versus the original's 4-UFBGA/CSPBGA. PCB layout and assembly process compatibility must be verified.
• Current Consumption: The substitute draws 8.5mA maximum supply current versus 6.5mA for the original, impacting power budget calculations.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-70.000MHZ-L-T3 directly replace the ASCSM-70.000MHZ-LR-T in existing designs?

A: Direct replacement requires verification of three factors: (1) PCB layout compatibility with the different package types (4-UFBGA/CSPBGA vs. 4-SMD No Lead), (2) supply voltage compatibility (fixed 3.3V vs. 1.7V–3.6V range), and (3) frequency stability tolerance acceptance (±50ppm vs. ±25ppm).

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

A: MEMS oscillators offer smaller form factors and lower power consumption but may have different aging characteristics and environmental sensitivity compared to crystal oscillators. The ASCSM uses MEMS technology while the ASCO substitute uses crystal resonance.

Q: Are both parts suitable for industrial temperature applications?

A: Yes, both components operate across the -40°C to 85°C temperature range, meeting industrial specifications.

Q: What are the package compatibility implications?

A: The original uses 4-UFBGA/CSPBGA (1.79mm × 1.25mm), while the substitute uses 4-SMD No Lead (1.60mm × 1.20mm). These require different PCB footprints and assembly processes. Verify your manufacturing capability before substitution.

Q: Is the substitute available in inventory?

A: The ASCO-70.000MHZ-L-T3 is an active product with 1107 pieces in stock, ensuring availability for procurement and production.

Q: How does the disable current specification affect power management?

A: The original specifies 15µA maximum disable current for low-power standby operation. The substitute does not provide this specification, requiring clarification with the manufacturer if disable-mode power consumption is critical to your application.