AX7MBF2-156.2500C Equivalent & Substitute Parts

Part Overview

The AX7MBF2-156.2500C is a 156.25 MHz XO (Standard) CML Oscillator manufactured by Abracon LLC as part of the ClearClock™ AX7 series. This surface mount oscillator 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

AX7MBF2-156.2500C

Abracon LLCIn Stock: 1069AX7MBF2-156.2500C 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 AX7MBF2-156.2500C 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)
• Type: XO (Standard) (exact match required)

The substitute parts identified 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 (Functional Equivalent with Voltage Consideration)

• 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 from Skyworks Solutions Inc. is the direct functional equivalent for the AX7MBF2-156.2500C. Both parts operate at 2.5V supply voltage with identical frequency, output type, stability, and temperature range specifications. The 590HB156M250DG is currently in active product status with 1153 units in stock, providing immediate availability. The primary design consideration is the package difference: the 590HB156M250DG uses a 6-SMD, No Lead package compared to the 8-SMD, No Lead package of the original part. The footprint dimensions remain identical at 7.00mm x 5.00mm, with a slightly lower seated height of 0.071" (1.80mm) versus 0.075" (1.90mm). The 590HB156M250DG exhibits higher maximum supply current at 110mA compared to 68mA for the original part.

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

These three parts operate at 1.8V supply voltage instead of 2.5V. Selection of these parts requires circuit-level evaluation to confirm that the lower supply voltage is compatible with the system design. All three maintain the same frequency, output type, stability, and temperature range as the original part. The 591KB156M250DG from Skyworks Solutions Inc. is in active product status with 668 units in stock. The AX7MCF1-156.2500C and AX7MCF3-156.2500C are Abracon LLC parts within the same ClearClock™ AX7 series as the original part, maintaining package compatibility with the 8-SMD, No Lead configuration, but are discontinued at DiGi Electronics.

Frequently Asked Questions (FAQ)

Q: Can the 590HB156M250DG be used as a direct replacement for the AX7MBF2-156.2500C?

A: The 590HB156M250DG is functionally equivalent in terms of frequency, output type, stability, and operating temperature range. The primary consideration is the package change from 8-SMD to 6-SMD, No Lead. The footprint dimensions are identical, but PCB layout and component placement may require adjustment. Additionally, the higher maximum supply current (110mA versus 68mA) must be evaluated in the context of the power supply design.

Q: What is the key difference between the 590HB156M250DG and the 591KB156M250DG?

A: Both parts are from Skyworks Solutions Inc. and share identical frequency, output type, stability, and temperature specifications. The primary difference is supply voltage: the 590HB156M250DG operates at 2.5V (matching the original part), while the 591KB156M250DG operates at 1.8V. The 591KB156M250DG also uses a 6-SMD, No Lead package. Selection between these parts depends on the system's supply voltage capability.

Q: Why are the Abracon LLC alternatives (AX7MCF1-156.2500C and AX7MCF3-156.2500C) listed if they are discontinued?

A: These parts are listed because they are functionally equivalent substitutes with the same frequency, output type, stability, and temperature range. They maintain the original 8-SMD, No Lead package configuration. However, both are discontinued at DiGi Electronics. They may be available through alternative distribution channels or existing inventory. The 590HB156M250DG is the recommended choice for new designs due to its active product status.

Q: Does the package change from 8-SMD to 6-SMD affect PCB compatibility?

A: The footprint dimensions (7.00mm x 5.00mm) and mounting type (Surface Mount) remain identical between the 8-SMD and 6-SMD packages. The seated height differs slightly (0.075" versus 0.071"), which is negligible for most applications. PCB layout compatibility depends on the specific pin configuration of each package. Consult the detailed datasheets for pin-to-pin compatibility before finalizing the design change.

Q: Can the 1.8V parts be used in a 2.5V system?

A: The 1.8V parts (591KB156M250DG, AX7MCF1-156.2500C, AX7MCF3-156.2500C) are designed for 1.8V supply voltage operation. Using them in a 2.5V system requires circuit-level evaluation and may not be appropriate without additional voltage regulation or design modification. The 590HB156M250DG is the appropriate choice for 2.5V systems.

Q: What is the inventory status of these substitute parts?

A: The 590HB156M250DG has 1153 units in stock. The 591KB156M250DG has 668 units in stock. Both are available for immediate procurement. The Abracon LLC alternatives (AX7MCF1-156.2500C and AX7MCF3-156.2500C) have 703 and 978 units in stock respectively, but are discontinued at DiGi Electronics and may have limited availability through alternative channels.