AX7MBF4-125.0000C Equivalent & Substitute Parts

Part Overview

The AX7MBF4-125.0000C is a 125 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, necessitating identification of functionally equivalent alternatives that maintain core electrical and mechanical compatibility for ongoing system support and new designs.

Substiute Parts

AX7MBF4-125.0000C

Abracon LLCIn Stock: 924AX7MBF4-125.0000C Datasheet

Current PartRFQ

591KB125M000DG

Skyworks Solutions Inc.In Stock: 1078591KB125M000DG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AX7MBF4-125.0000C is determined by the following critical parameters:

• Frequency: 125 MHz (exact match required)
• Output Type: CML (exact match required)
• Function: Enable/Disable capability (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• Frequency Stability: ±25ppm (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Physical Footprint: 7.00mm x 5.00mm (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)
• Compliance: ROHS3 Compliant, REACH Unaffected, EAR99 (exact match required)

The substitute part 591KB125M000DG from Skyworks Solutions Inc. meets all critical electrical and mechanical parameters. Variations in supply voltage (1.8V vs. 2.5V), package configuration (6-SMD vs. 8-SMD), and current consumption are secondary considerations that may require circuit-level evaluation but do not preclude functional substitution when voltage regulation or level shifting is available in the design.

Parameter Comparison

Engineering Selection Recommendations

The 591KB125M000DG from Skyworks Solutions Inc. is an active product with equivalent core specifications to the discontinued AX7MBF4-125.0000C. Both components share identical frequency (125 MHz), output type (CML), function (Enable/Disable), frequency stability (±25ppm), operating temperature range (-40°C ~ 85°C), physical footprint (7.00mm x 5.00mm), and compliance classification (EAR99, HTSUS 8542.39.0001).

The primary differences are supply voltage (1.8V vs. 2.5V), package pin count (6-SMD vs. 8-SMD), and current consumption. These differences require circuit-level assessment. The lower supply voltage of the substitute part necessitates confirmation that the design's power distribution network can accommodate 1.8V operation, or that voltage regulation is available. The reduced pin count and lower seated height present potential advantages for space-constrained applications.

Both components maintain MSL 1 (Unlimited) moisture sensitivity classification, ensuring equivalent handling and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the 591KB125M000DG directly replace the AX7MBF4-125.0000C without circuit modifications?

A: Direct PCB replacement is possible due to identical physical footprint (7.00mm x 5.00mm) and pin spacing. However, the supply voltage difference (1.8V vs. 2.5V) requires confirmation that the design's power supply can deliver 1.8V, or that voltage regulation is present in the circuit. The reduced pin count (6-SMD vs. 8-SMD) must be verified against the PCB layout.

Q: What are the key parameters that determine substitution eligibility?

A: Frequency (125 MHz), output type (CML), enable/disable function, frequency stability (±25ppm), operating temperature range (-40°C ~ 85°C), physical footprint (7.00mm x 5.00mm), and compliance classification (EAR99) are the critical parameters. Variations in supply voltage, current consumption, and package pin count are secondary and require design-level evaluation.

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

A: Both components are classified as EAR99 and share the same HTSUS code (8542.39.0001). The AX7MBF4-125.0000C is specified as ROHS3 Compliant and REACH Unaffected. Compliance documentation for the 591KB125M000DG should be obtained from Skyworks Solutions Inc. to confirm equivalent regulatory status.

Q: What is the impact of the higher current consumption in the substitute part?

A: The 591KB125M000DG draws 110mA maximum supply current compared to 68mA for the AX7MBF4-125.0000C. This 42mA difference requires assessment of the power supply capacity and thermal management in the application. Disable mode current is also higher (75mA vs. 67mA).

Q: Are the physical dimensions compatible for PCB assembly?

A: Yes. Both components share identical length and width (7.00mm x 5.00mm). The substitute part has a slightly lower seated height (0.071" vs. 0.075"), which is advantageous for space-constrained designs and does not create compatibility issues.

Q: What is the inventory status of these parts?

A: The AX7MBF4-125.0000C is discontinued at DiGi Electronics with 845 pcs listed as new original in stock. The 591KB125M000DG is an active product with 975 pcs available in strip packaging, providing ongoing supply assurance.