AX7MBF3-156.2500C Equivalent & Substitute Parts

Part Overview

The AX7MBF3-156.2500C 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 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

AX7MBF3-156.2500C

Abracon LLCIn Stock: 735AX7MBF3-156.2500C 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 AX7MBF3-156.2500C is determined by the following critical parameters:

Primary Matching Criteria:

• 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)

Secondary Compatibility Factors:

• Supply Voltage: 2.5V (primary part specification)
• Package Type: 8-SMD or 6-SMD, No Lead (both acceptable for same footprint family)
• Physical Dimensions: 7.00mm x 5.00mm (exact match)
• Moisture Sensitivity Level: 1 (Unlimited)

The substitute parts listed below maintain all primary matching criteria. Variations in package pin count (8-SMD vs. 6-SMD) and supply voltage are noted as design considerations.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Recommended for 2.5V Systems): 590HB156M250DG (Skyworks Solutions Inc., Si590 series) is the direct functional equivalent for applications requiring 2.5V supply voltage. This part maintains all critical electrical parameters and is currently in active production status. The 6-SMD package differs from the original 8-SMD configuration but operates within the same 7.00mm x 5.00mm footprint envelope. Current consumption is higher at 110mA maximum compared to 68mA for the original part; verify power budget compatibility in your application.

Alternative Substitutes (1.8V Supply Voltage Systems): 591KB156M250DG (Skyworks Solutions Inc., Si591 series) and AX7MCF1-156.2500C / AX7MCF3-156.2500C (Abracon LLC, ClearClock™ AX7 series) are suitable only for designs operating at 1.8V supply voltage. The Skyworks part is in active production; the Abracon parts are discontinued at DiGi Electronics. All three maintain identical frequency, output type, function, and frequency stability specifications.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage practices. ECCN and HTSUS classifications remain consistent across all listed parts.

Frequently Asked Questions (FAQ)

Q: Can I use 591KB156M250DG as a direct replacement for AX7MBF3-156.2500C? A: No. The 591KB156M250DG operates at 1.8V supply voltage, while the AX7MBF3-156.2500C requires 2.5V. Direct substitution requires circuit redesign to accommodate the lower supply voltage. Use 590HB156M250DG for 2.5V applications.

Q: What is the difference between the 8-SMD and 6-SMD packages? A: Both packages maintain the same 7.00mm x 5.00mm footprint and are compatible with identical PCB landing patterns. The pin count difference reflects internal circuit architecture variations between manufacturers. Electrical performance and functional specifications remain equivalent.

Q: Are the Skyworks Si590 and Si591 series parts ROHS3 compliant? A: ROHS3 compliance status is not specified in the provided data for Skyworks parts. Verify compliance documentation with the manufacturer or distributor before final design approval.

Q: What is the impact of higher current consumption in the 590HB156M250DG? A: The 590HB156M250DG draws 110mA maximum compared to 68mA for the original part. Confirm that your power supply and PCB trace routing can accommodate this 42mA increase without exceeding thermal or voltage regulation limits.

Q: Can I use AX7MCF1-156.2500C or AX7MCF3-156.2500C as substitutes? A: These Abracon parts are functionally equivalent but operate at 1.8V and are discontinued at DiGi Electronics. They are suitable only if your design supports 1.8V operation and you have access to inventory through alternative distribution channels.

Q: Are all substitute parts rated for -40°C ~ 85°C operation? A: Yes. All listed substitute parts maintain the same operating temperature range as the original AX7MBF3-156.2500C.