AX7MBF4-644.53125C Equivalent & Substitute Parts

Part Overview

The AX7MBF4-644.53125C is a 644.53125 MHz XO (Standard) CML Oscillator manufactured by Abracon LLC, 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 measuring 7.00mm x 5.00mm. The product is discontinued at DiGi Electronics, making identification of equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

AX7MBF4-644.53125C

Abracon LLCIn Stock: 709AX7MBF4-644.53125C Datasheet

Current PartRFQ

AX7MCF1-644.53125C

Abracon LLCIn Stock: 1129AX7MCF1-644.53125C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AX7MBF4-644.53125C is determined by the following critical parameters that must remain constant:

• Frequency: 644.53125 MHz (exact match required)
• Type: XO (Standard)
• Output: CML
• Function: Enable/Disable
• Package / Case: 8-SMD, No Lead
• Size / Dimension: 7.00mm x 5.00mm
• Operating Temperature: -40°C ~ 85°C
• Frequency Stability: ±25ppm
• Mounting Type: Surface Mount

The substitute part AX7MCF1-644.53125C maintains all critical parameters with the exception of supply voltage, which differs at 1.8V versus the original 2.5V specification. This voltage difference represents a functional variation that must be evaluated against circuit design requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the AX7MBF4-644.53125C and AX7MCF1-644.53125C are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards. The primary distinction between these parts is the supply voltage specification: 2.5V for the main part and 1.8V for the substitute.

Selection between these parts depends on circuit power supply architecture. If the design operates on a 2.5V rail, the AX7MBF4-644.53125C is the direct specification match. If the design operates on a 1.8V rail or supports 1.8V operation, the AX7MCF1-644.53125C provides equivalent oscillator performance with matching frequency, stability, package, and thermal characteristics.

Both parts share identical mechanical packaging, thermal operating range, frequency stability, and current consumption specifications, ensuring functional interchangeability within their respective voltage domains.

Frequently Asked Questions (FAQ)

Q: Can the AX7MCF1-644.53125C replace the AX7MBF4-644.53125C in all applications?

A: Substitution is valid only if the circuit design supports 1.8V operation. The substitute part operates at 1.8V supply voltage, whereas the original operates at 2.5V. Verify that your power supply rail and oscillator input circuitry are compatible with 1.8V before substitution.

Q: Are the physical packages identical?

A: Yes. Both parts use the same 8-SMD, No Lead package with dimensions of 7.00mm x 5.00mm and maximum seated height of 1.90mm. PCB footprints and assembly processes are identical.

Q: Do both parts have the same frequency stability?

A: Yes. Both the AX7MBF4-644.53125C and AX7MCF1-644.53125C maintain ±25ppm frequency stability across the -40°C to 85°C operating temperature range.

Q: What is the current consumption difference between these parts?

A: Both parts specify 68mA maximum supply current and 67mA maximum disable current. Current consumption is identical.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical environmental and regulatory certifications.

Q: Which part should I select for new designs?

A: Selection depends on your power supply architecture. For 2.5V systems, use AX7MBF4-644.53125C. For 1.8V systems, use AX7MCF1-644.53125C. Both provide equivalent oscillator performance at their respective voltage specifications.