AX7MCF2-156.2500C Equivalent & Substitute Parts

Part Overview

The AX7MCF2-156.2500C is a 156.25 MHz XO (Standard) CML Oscillator manufactured by Abracon LLC as part of the ClearClock™ AX7 series. This surface mount crystal oscillator operates at 1.8V with Enable/Disable functionality and is housed in an 8-SMD, No Lead package. The part is currently discontinued at DiGi Electronics, making identification of equivalent and substitute components essential for ongoing design support and procurement.

Substiute Parts

AX7MCF2-156.2500C

Abracon LLCIn Stock: 705AX7MCF2-156.2500C Datasheet

Current PartRFQ

591KB156M250DG

Skyworks Solutions Inc.In Stock: 730591KB156M250DG Datasheet

MFR RecommendedRFQ

AX7MCF1-156.2500C

Abracon LLCIn Stock: 749AX7MCF1-156.2500C Datasheet

Parametric EquivalentRFQ

AX7MCF3-156.2500C

Abracon LLCIn Stock: 1074AX7MCF3-156.2500C Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AX7MCF2-156.2500C are identified based on strict electrical and mechanical parameter matching. The critical parameters that define substitutability are:

• Frequency: 156.25 MHz (exact match required)
• Output Type: CML (exact match required)
• Supply Voltage: 1.8V (exact match required)
• Function: Enable/Disable (exact match required)
• Frequency Stability: ±25ppm (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Physical Footprint: 7.00mm x 5.00mm (exact match required)
• Moisture Sensitivity Level: MSL 1 (exact match required)

Parametric equivalents within the Abracon LLC ClearClock™ AX7 series (AX7MCF1-156.2500C and AX7MCF3-156.2500C) meet all electrical specifications. The manufacturer-recommended substitute from Skyworks Solutions Inc. (591KB156M250DG) meets all critical electrical parameters but differs in package configuration (6-SMD vs. 8-SMD) and maximum supply current specifications.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring the AX7MCF2-156.2500C, the following selection path is recommended based on product status and compliance:

Primary Alternatives (Parametric Equivalents): AX7MCF1-156.2500C and AX7MCF3-156.2500C are direct parametric equivalents within the same ClearClock™ AX7 series. Both parts maintain identical electrical specifications, package configuration, and compliance certifications (ROHS3). These parts are preferred for designs where the 8-SMD package footprint is required and where Abracon LLC component continuity is necessary.

Cross-Manufacturer Substitute: The 591KB156M250DG from Skyworks Solutions Inc. is the manufacturer-recommended substitute. This part meets all critical electrical parameters (frequency, output type, supply voltage, function, stability, and temperature range) and maintains the same physical footprint dimensions. However, the package differs (6-SMD vs. 8-SMD), and maximum supply current is higher at 110mA compared to 68mA. This substitute is suitable for designs where the 6-SMD package is compatible with the PCB layout and where the increased current specification does not create thermal or power delivery constraints. The 591KB156M250DG is currently active in production.

Frequently Asked Questions (FAQ)

Q: Can the 591KB156M250DG be used as a direct replacement for the AX7MCF2-156.2500C?

A: The 591KB156M250DG meets all critical electrical specifications and maintains the same 7.00mm x 5.00mm footprint. However, the package configuration differs (6-SMD vs. 8-SMD), requiring PCB layout verification. The higher maximum supply current (110mA vs. 68mA) must be evaluated against power supply and thermal design margins.

Q: What is the difference between AX7MCF1-156.2500C, AX7MCF2-156.2500C, and AX7MCF3-156.2500C?

A: These three parts are parametric equivalents with identical electrical and mechanical specifications. The designations (MCF1, MCF2, MCF3) represent different variants within the ClearClock™ AX7 series. All three parts are discontinued at DiGi Electronics and share the same substitute options.

Q: Are there any compliance or certification differences between the Abracon and Skyworks parts?

A: The Abracon parts (AX7MCF series) are ROHS3 compliant with REACH Unaffected status. The Skyworks 591KB156M250DG compliance status is not specified in the provided data. Compliance verification with the Skyworks datasheet is required for applications with specific regulatory requirements.

Q: Does the 1.80mm maximum height of the 591KB156M250DG affect compatibility?

A: The 591KB156M250DG has a maximum seated height of 1.80mm compared to 1.90mm for the AX7MCF series. This 0.10mm difference is within typical PCB assembly tolerances but should be verified against board clearance requirements and component placement constraints.

Q: What is the impact of the different package types on PCB design?

A: The 8-SMD package of the AX7MCF series differs from the 6-SMD package of the 591KB156M250DG. While both maintain the same 7.00mm x 5.00mm footprint, the pad layout and pin configuration differ. PCB layout and assembly files must be updated to accommodate the package change.