AX7MBF1-491.5200C Equivalent & Substitute Parts

Part Overview

The AX7MBF1-491.5200C is a 491.52 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. The part is discontinued at DiGi Electronics, making identification of equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

AX7MBF1-491.5200C

Abracon LLCIn Stock: 997AX7MBF1-491.5200C Datasheet

Current PartRFQ

AX7MCF1-491.5200C

Abracon LLCIn Stock: 838AX7MCF1-491.5200C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AX7MBF1-491.5200C is determined by the following critical parameters:

Mandatory Matching Parameters:

• Frequency: 491.52 MHz
• Output Type: CML
• Function: Enable/Disable
• Package / Case: 8-SMD, No Lead
• Physical Dimensions: 0.276" L x 0.197" W (7.00mm x 5.00mm)
• Height - Seated (Max): 0.075" (1.90mm)
• Frequency Stability: ±25ppm
• Operating Temperature Range: -40°C ~ 85°C

Allowable Variation Parameters:

• Supply Voltage: Alternative voltage ratings within the same series are acceptable if the design supports voltage flexibility
• Current - Supply (Max): Variations within the same series are acceptable

The AX7MCF1-491.5200C qualifies as a substitute based on matching all mandatory parameters while operating at a different supply voltage (1.8V instead of 2.5V).

Parameter Comparison

Engineering Selection Recommendations

Both the AX7MBF1-491.5200C and AX7MCF1-491.5200C are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. 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 the power supply architecture of the target application. If the design operates on a 2.5V rail, the AX7MBF1-491.5200C is the direct match. If the design operates on a 1.8V rail or supports dual voltage operation, the AX7MCF1-491.5200C is a suitable alternative. Both parts share identical frequency, output type, package, thermal characteristics, and frequency stability specifications, ensuring functional equivalence within their respective voltage domains.

Frequently Asked Questions (FAQ)

Q: Can the AX7MCF1-491.5200C replace the AX7MBF1-491.5200C in all applications?

A: Substitution is valid only if the application's power supply architecture supports 1.8V operation. The oscillator's frequency, output characteristics, and package are identical; however, the supply voltage difference requires circuit-level compatibility verification.

Q: Are the physical dimensions and mounting characteristics identical?

A: Yes. Both parts use the 8-SMD, No Lead package with dimensions of 0.276" L x 0.197" W (7.00mm x 5.00mm) and a maximum seated height of 0.075" (1.90mm). PCB layout and reflow profiles remain unchanged.

Q: What is the significance of the frequency stability specification?

A: Both parts maintain ±25ppm frequency stability across the -40°C ~ 85°C operating temperature range. This specification ensures consistent oscillator performance and is identical between the main part and substitute.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical environmental and regulatory certifications. MSL rating of 1 (Unlimited) applies to both.

Q: What does the Enable/Disable function provide?

A: This function allows the oscillator output to be controlled via an external signal, enabling power management and dynamic frequency control within the application circuit.