ASCSM-27.000MHZ-LR-T Equivalent & Substitute Parts

Part Overview

The ASCSM-27.000MHZ-LR-T is a 27 MHz MEMS-based XO (Standard) oscillator manufactured by Abracon LLC, designed for applications requiring a 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 ASCSM-27.000MHZ-LR-T has reached obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Frequency	27 MHz
Output Type	CMOS
Function	Enable/Disable
Supply Voltage Range	1.7V ~ 3.6V
Frequency Stability	±25ppm
Operating Temperature	-40°C ~ 85°C
Maximum Supply Current	6.5mA
Package Type	4-UFBGA, CSPBGA
Package Dimensions	1.79mm L × 1.25mm W
Maximum Seated Height	0.69mm
Disable Mode Current	15µA
Base Resonator Type	MEMS
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the ASCSM-27.000MHZ-LR-T requires matching the following critical parameters:

Frequency: 27 MHz (exact match required)
Output Type: CMOS
Function: Enable/Disable capability
Operating Temperature Range: -40°C ~ 85°C (minimum requirement)
Package Type: Surface mount, compact form factor
Compliance: RoHS3 compliance and REACH unaffected status

The ASCO-27.000MHZ-L-T3 qualifies as a direct substitute based on these parameters. While the ASCO series uses a crystal-based resonator rather than MEMS technology, it maintains functional equivalence through matching frequency, output type, enable/disable function, and operating temperature range. The supply voltage specification differs (3.3V fixed versus 1.7V–3.6V range), and frequency stability is relaxed (±50ppm versus ±25ppm), which must be evaluated against specific application requirements.

Parameter Comparison

Parameter	ASCSM-27.000MHZ-LR-T	ASCO-27.000MHZ-L-T3
Manufacturer	Abracon LLC	Abracon LLC
Frequency	27 MHz	27 MHz
Output Type	CMOS	CMOS
Function	Enable/Disable	Enable/Disable
Supply Voltage	1.7V ~ 3.6V	3.3V
Frequency Stability	±25ppm	±50ppm
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Maximum Supply Current	6.5mA	6mA
Package Type	4-UFBGA, CSPBGA	4-SMD, No Lead
Package Dimensions	1.79mm L × 1.25mm W	1.60mm L × 1.20mm W
Maximum Seated Height	0.69mm	0.70mm
Base Resonator	MEMS	Crystal
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The ASCO-27.000MHZ-L-T3 is an active product with current manufacturing support, making it suitable for new designs and ongoing production. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment.

Key considerations for selection:

Supply Voltage: The ASCO-27.000MHZ-L-T3 operates at a fixed 3.3V supply, whereas the ASCSM-27.000MHZ-LR-T supports 1.7V to 3.6V. Applications requiring operation below 3.3V or with variable supply voltages must evaluate this constraint.
Frequency Stability: The ASCO-27.000MHZ-L-T3 provides ±50ppm stability compared to ±25ppm for the ASCSM-27.000MHZ-LR-T. Applications with tight frequency tolerance requirements must assess this difference.
Package Compatibility: Both parts are compact surface-mount devices with similar footprints and heights, suitable for high-density PCB layouts.
Resonator Technology: The transition from MEMS to crystal-based resonator does not affect functional equivalence for this frequency and application class.

Frequently Asked Questions (FAQ)

Q: Can the ASCO-27.000MHZ-L-T3 directly replace the ASCSM-27.000MHZ-LR-T in existing designs?

A: Direct replacement is possible if the application operates at 3.3V supply voltage and can tolerate ±50ppm frequency stability. If the design requires operation below 3.3V or demands ±25ppm stability, alternative parts must be evaluated.

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

A: Both technologies deliver equivalent functional performance for 27 MHz CMOS output with enable/disable control. The MEMS-based ASCSM provides tighter frequency stability (±25ppm) and wider supply voltage range (1.7V–3.6V). The crystal-based ASCO provides active product status with ongoing manufacturing support.

Q: Are the package dimensions compatible for PCB layout?

A: Both parts use compact surface-mount packages with nearly identical dimensions (ASCSM: 1.79mm × 1.25mm; ASCO: 1.60mm × 1.20mm) and seated heights (ASCSM: 0.69mm; ASCO: 0.70mm). PCB footprints designed for either part are compatible.

Q: What is the significance of the product status difference?

A: The ASCSM-27.000MHZ-LR-T is obsolete, indicating no further manufacturing or support. The ASCO-27.000MHZ-L-T3 is active, ensuring availability, technical support, and long-term supply continuity for production and field replacements.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components in most markets.

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