AX7MCF3-156.2500C Equivalent & Substitute Parts

Part Overview

The AX7MCF3-156.2500C 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 equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

AX7MCF3-156.2500C

Abracon LLCIn Stock: 1074AX7MCF3-156.2500C 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

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the AX7MCF3-156.2500C are qualified based on the following critical parameters:

• 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)
• Package Type: Surface Mount, No Lead (functional equivalence)
• Physical Dimensions: 7.00mm x 5.00mm (exact match required)

The substitute parts identified maintain electrical compatibility across all critical parameters. Package variations (8-SMD vs. 6-SMD) are noted as they may affect PCB layout considerations, though both are surface mount, no-lead configurations with identical footprint dimensions.

Parameter Comparison

Engineering Selection Recommendations

591KB156M250DG (Skyworks Solutions Inc.) is the manufacturer-recommended substitute. This part maintains full electrical equivalence across all critical parameters and carries Active product status, ensuring long-term availability and supply chain continuity. The 6-SMD package configuration differs from the original 8-SMD, though both maintain identical footprint dimensions. Supply current specifications are higher (110mA maximum vs. 68mA), which should be evaluated against power budget constraints in the target application.

AX7MCF1-156.2500C (Abracon LLC) is a parametric equivalent within the same ClearClock™ AX7 series. This part provides electrical compatibility and maintains the original 8-SMD package configuration. However, it shares the Discontinued at DiGi Electronics status with the main part, limiting its utility for long-term procurement strategies.

Frequently Asked Questions (FAQ)

Q: Can the 591KB156M250DG be used as a direct replacement for the AX7MCF3-156.2500C?

A: Yes. Both parts operate at 156.25 MHz with CML output, 1.8V supply, Enable/Disable function, and ±25ppm frequency stability across the -40°C to 85°C temperature range. The primary difference is the package configuration (6-SMD vs. 8-SMD), though both maintain the same 7.00mm x 5.00mm footprint dimensions. Supply current is higher in the 591KB156M250DG (110mA vs. 68mA maximum), which must be verified against circuit design requirements.

Q: What is the difference between the 8-SMD and 6-SMD package configurations?

A: Both are surface mount, no-lead packages with identical footprint dimensions (7.00mm x 5.00mm). The difference lies in the number of solder pads and internal pin configuration. The 6-SMD package has a slightly lower maximum height (1.80mm vs. 1.90mm). PCB layout compatibility should be verified with the specific package datasheet before implementation.

Q: Is the AX7MCF1-156.2500C a viable alternative?

A: The AX7MCF1-156.2500C provides full electrical equivalence and maintains the original 8-SMD package. However, it shares the Discontinued at DiGi Electronics status with the main part. For new designs or long-term production, the active-status 591KB156M250DG is the preferred choice.

Q: Are there compliance or certification differences between these parts?

A: The AX7MCF3-156.2500C and AX7MCF1-156.2500C are both ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited). The 591KB156M250DG RoHS status is not specified in the available data and should be confirmed with the manufacturer for applications requiring specific compliance certifications.

Q: How do the supply current specifications affect part selection?

A: The 591KB156M250DG draws higher maximum supply current (110mA vs. 68mA) and higher disable-mode current (75mA vs. 67mA). Applications with strict power budgets or battery-powered designs should evaluate whether the increased current consumption is acceptable for the target circuit.