AX7MBF1-156.2500C Equivalent & Substitute Parts

Part Overview

The AX7MBF1-156.2500C is a 156.25 MHz XO (Standard) CML Oscillator manufactured by Abracon LLC, part of the ClearClock™ AX7 series. This component operates at 2.5V with Enable/Disable functionality and is housed in an 8-SMD, No Lead package. The part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

AX7MBF1-156.2500C

Abracon LLCIn Stock: 842AX7MBF1-156.2500C Datasheet

Current PartRFQ

590HB156M250DG

Skyworks Solutions Inc.In Stock: 1216590HB156M250DG Datasheet

MFR RecommendedRFQ

591KB156M250DG

Skyworks Solutions Inc.In Stock: 730591KB156M250DG Datasheet

MFR RecommendedRFQ

AX7MCF1-156.2500C

Abracon LLCIn Stock: 749AX7MCF1-156.2500C Datasheet

MFR RecommendedRFQ

AX7MCF3-156.2500C

Abracon LLCIn Stock: 1074AX7MCF3-156.2500C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AX7MBF1-156.2500C is determined by the following critical parameters:

• Frequency: 156.25 MHz (exact match required)
• Output Type: CML (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)
• Base Resonator: Crystal (exact match required)

The substitute parts are grouped into two categories based on supply voltage compatibility:

Category 1: 2.5V Supply Voltage (Direct Functional Equivalent)

• 590HB156M250DG (Skyworks Solutions Inc., Si590 series)

Category 2: 1.8V Supply Voltage (Voltage-Dependent Alternative)

• 591KB156M250DG (Skyworks Solutions Inc., Si591 series)
• AX7MCF1-156.2500C (Abracon LLC, ClearClock™ AX7 series)
• AX7MCF3-156.2500C (Abracon LLC, ClearClock™ AX7 series)

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 590HB156M250DG

The 590HB156M250DG (Skyworks Solutions Inc., Si590 series) is the direct functional equivalent for the AX7MBF1-156.2500C. Both parts operate at 2.5V supply voltage with identical frequency, output type, stability, and temperature range specifications. The Si590 is currently in active production status, ensuring long-term availability. The primary design consideration is the package difference: the Si590 uses a 6-SMD, No Lead package compared to the 8-SMD, No Lead package of the AX7MBF1-156.2500C. Both packages maintain the same footprint dimensions (7.00mm x 5.00mm) with minimal height variation (1.80mm vs. 1.90mm). Current consumption is higher in the Si590 (110mA vs. 68mA), which must be evaluated within the system power budget.

Alternative Substitutes: 591KB156M250DG, AX7MCF1-156.2500C, AX7MCF3-156.2500C

These parts operate at 1.8V supply voltage and are suitable only for designs that can accommodate reduced supply voltage. The 591KB156M250DG (Skyworks Solutions Inc., Si591 series) is in active production. The AX7MCF1-156.2500C and AX7MCF3-156.2500C (Abracon LLC, ClearClock™ AX7 series) maintain the same 8-SMD package as the original part but are discontinued at DiGi Electronics. All three alternatives share identical frequency, output type, stability, and temperature specifications with the main part. Current consumption is higher in the Skyworks Si591 (110mA vs. 68mA).

Frequently Asked Questions (FAQ)

Q: Can the 590HB156M250DG be used as a direct replacement for the AX7MBF1-156.2500C?

A: The 590HB156M250DG is functionally equivalent in all critical electrical parameters: 156.25 MHz frequency, CML output, 2.5V supply voltage, Enable/Disable function, ±25ppm stability, and -40°C to 85°C operating range. The primary difference is the package type: 6-SMD, No Lead versus 8-SMD, No Lead. Both packages have identical footprint dimensions (7.00mm x 5.00mm). PCB layout modifications may be required to accommodate the different pad configuration. Current consumption is higher (110mA vs. 68mA), which must be evaluated for system power requirements.

Q: What is the difference between the 2.5V and 1.8V supply voltage options?

A: The AX7MBF1-156.2500C operates at 2.5V supply voltage. The 591KB156M250DG, AX7MCF1-156.2500C, and AX7MCF3-156.2500C operate at 1.8V supply voltage. These are not interchangeable without circuit redesign. Selection depends on the system's power supply architecture and voltage regulation capabilities. All other electrical specifications (frequency, output type, stability, temperature range) remain identical across both voltage classes.

Q: Are there package compatibility concerns with the Skyworks Si590 and Si591 series?

A: The Skyworks Si590 and Si591 use 6-SMD, No Lead packages, while the Abracon AX7MBF1-156.2500C uses an 8-SMD, No Lead package. Although both packages maintain the same footprint dimensions (7.00mm x 5.00mm), the internal pad configuration differs. PCB redesign is required to accommodate the different pad layout. Height differences are minimal (1.80mm vs. 1.90mm) and do not present clearance issues in typical applications.

Q: What is the current consumption difference between the main part and substitutes?

A: The AX7MBF1-156.2500C draws a maximum of 68mA during operation and 67mA when disabled. The 590HB156M250DG and 591KB156M250DG draw a maximum of 110mA during operation and 75mA when disabled. The higher current consumption in the Skyworks parts must be evaluated within the system's power budget and thermal management requirements.

Q: Are all substitute parts RoHS compliant?

A: The AX7MBF1-156.2500C, AX7MCF1-156.2500C, and AX7MCF3-156.2500C are ROHS3 compliant. RoHS status for the 590HB156M250DG and 591KB156M250DG is not specified in the provided data.

Q: Which substitute part has the best long-term availability?

A: The 590HB156M250DG (Skyworks Solutions Inc., Si590 series) and 591KB156M250DG (Skyworks Solutions Inc., Si591 series) are both in active production status, ensuring long-term availability. The AX7MCF1-156.2500C and AX7MCF3-156.2500C are discontinued at DiGi Electronics and should not be selected for new designs requiring extended component availability.