AX7MBF2-644.53125C Equivalent & Substitute Parts

Part Overview

The AX7MBF2-644.53125C 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 supply voltage with Enable/Disable functionality, designed for applications requiring precise frequency generation at CML output levels. The product is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing system support and component procurement.

Substiute Parts

AX7MBF2-644.53125C

Abracon LLCIn Stock: 1132AX7MBF2-644.53125C Datasheet

Current PartRFQ

AX7MCF1-644.53125C

Abracon LLCIn Stock: 1129AX7MCF1-644.53125C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AX7MBF2-644.53125C is determined by strict alignment of the following critical parameters:

• Frequency: 644.53125 MHz (exact match required)
• Output Type: CML (exact match required)
• Package / Case: 8-SMD, No Lead (exact match required)
• Size / Dimension: 0.276" L x 0.197" W (7.00mm x 5.00mm) (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• Frequency Stability: ±25ppm (exact match required)
• Function: Enable/Disable (exact match required)
• Series: ClearClock™ AX7 (same series preferred)

The AX7MCF1-644.53125C qualifies as a substitute part based on matching all critical electrical and mechanical parameters. The primary difference is the supply voltage specification: the substitute operates at 1.8V versus the original 2.5V. This voltage difference requires circuit-level evaluation to determine compatibility with existing power supply infrastructure.

Parameter Comparison

Engineering Selection Recommendations

The AX7MCF1-644.53125C is available as a substitute for the discontinued AX7MBF2-644.53125C. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for applications subject to environmental standards.

The primary consideration for substitution is the supply voltage differential. The substitute part operates at 1.8V compared to the original 2.5V specification. System designs currently powered at 2.5V require evaluation of power supply capability to step down to 1.8V, or confirmation that the system architecture supports dual voltage rails. The identical frequency, output type, package configuration, and thermal operating range ensure mechanical and functional compatibility at the component level.

Both parts are discontinued at DiGi Electronics. Current inventory availability should be confirmed with authorized distributors prior to procurement decisions.

Frequently Asked Questions (FAQ)

Q: Can the AX7MCF1-644.53125C directly replace the AX7MBF2-644.53125C without circuit modifications?

A: Direct replacement requires that the system power supply can deliver 1.8V to the oscillator. If the original design provides only 2.5V, voltage regulation or power supply modification is necessary. The mechanical footprint and electrical interface are identical; the voltage requirement is the only parameter difference.

Q: Are the frequency and output characteristics identical between these parts?

A: Yes. Both parts generate 644.53125 MHz at ±25ppm stability with CML output type. Frequency performance and signal characteristics are equivalent.

Q: Do both parts use the same package and mounting approach?

A: Yes. Both parts use 8-SMD, No Lead packaging with identical dimensions (7.00mm x 5.00mm) and height (1.90mm maximum seated height). PCB layout and reflow soldering processes are compatible.

Q: What is the moisture sensitivity level for these oscillators?

A: Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply.

Q: Are there compliance or certification differences between the two parts?

A: No. Both parts are ROHS3 compliant and REACH unaffected, meeting the same environmental and regulatory standards.