ASCSM-1.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-1.000MHZ-LR-T is a 1 MHz MEMS-based XO (Standard) oscillator manufactured by Abracon LLC, featuring CMOS output with Enable/Disable functionality. Operating across 1.7V to 3.6V supply range, this component delivers ±25ppm frequency stability in a compact 4-UFBGA/CSPBGA package measuring 1.79mm × 1.25mm.

The product is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain core electrical and mechanical compatibility for new designs or production transitions.

Substiute Parts

ASCSM-1.000MHZ-LR-T

Abracon LLCIn Stock: 705ASCSM-1.000MHZ-LR-T Datasheet

Current PartRFQ

ASCO-1.000MHZ-L-T3

Abracon LLCIn Stock: 792ASCO-1.000MHZ-L-T3 Datasheet

DirectRFQ

CPPFXC7L-A3B6-1.0TS

Cardinal Components Inc.In Stock: 1127CPPFXC7L-A3B6-1.0TS Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Frequency Match: 1 MHz (exact)
• Output Configuration: CMOS with Enable/Disable function
• Mounting: Surface Mount technology
• Compliance: ROHS3 and REACH requirements
• Electrical Compatibility: Supply voltage and frequency stability within acceptable design margins

Two substitute parts meet these criteria with varying trade-offs in voltage range, frequency stability, and package form factor.

Parameter Comparison

Engineering Selection Recommendations

ASCO-1.000MHZ-L-T3 (Abracon LLC) provides the closest electrical compatibility as an active product from the same manufacturer. This substitute maintains identical frequency, output type, and Enable/Disable function. The fixed 3.3V supply requirement represents a constraint compared to the original 1.7V–3.6V range. Frequency stability degrades to ±50ppm versus the original ±25ppm specification. Package dimensions remain comparable (1.60mm × 1.20mm), supporting space-constrained layouts. Current consumption improves to 4.5mA maximum.

CPPFXC7L-A3B6-1.0TS (Cardinal Components Inc., FIPO™ CPPFX series) offers superior frequency stability at ±15ppm and extended operating temperature range (-55°C to 125°C). This part is recommended for designs requiring tighter frequency tolerance or broader thermal performance. The 3.3V fixed supply and significantly larger package footprint (7.00mm × 5.00mm, 1.90mm height) necessitate PCB layout revision. Maximum current consumption increases to 25mA.

Both substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.

Frequently Asked Questions (FAQ)

Q: Can ASCO-1.000MHZ-L-T3 directly replace ASCSM-1.000MHZ-LR-T in existing designs?

A: Direct replacement requires verification of supply voltage constraints. The ASCO operates at fixed 3.3V, whereas the original supports 1.7V–3.6V. If your circuit supplies only 1.7V–3.0V, this substitute is incompatible. Frequency stability tolerance must also be evaluated; the ±50ppm specification is twice the original ±25ppm.

Q: What are the package compatibility implications?

A: The original ASCSM uses 4-UFBGA/CSPBGA packaging (1.79mm × 1.25mm). Both substitutes employ 4-SMD No Lead packages. ASCO-1.000MHZ-L-T3 maintains similar footprint dimensions (1.60mm × 1.20mm), supporting minimal PCB redesign. CPPFXC7L-A3B6-1.0TS requires significant layout modification due to its 7.00mm × 5.00mm footprint.

Q: Which substitute offers the best frequency stability?

A: CPPFXC7L-A3B6-1.0TS delivers ±15ppm stability, superior to both the original (±25ppm) and ASCO alternative (±50ppm). This advantage comes with trade-offs in package size and current consumption.

Q: Are both substitutes suitable for low-voltage applications?

A: No. Both substitutes require fixed 3.3V supply. Applications operating below 3.0V cannot use either alternative. The original ASCSM's 1.7V minimum specification cannot be matched by available substitutes.

Q: What is the impact on power consumption?

A: ASCO-1.000MHZ-L-T3 reduces active current to 4.5mA (versus 6.5mA original). CPPFXC7L-A3B6-1.0TS increases consumption to 25mA, representing a significant penalty for applications with strict power budgets.