AX7MBF4-640.0000C Equivalent & Substitute Parts

Part Overview

The AX7MBF4-640.0000C is a 640 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 product is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain core electrical and mechanical compatibility for 640 MHz CML oscillator applications.

Substiute Parts

AX7MBF4-640.0000C

Abracon LLCIn Stock: 868AX7MBF4-640.0000C Datasheet

Current PartRFQ

591KB640M000DG

Skyworks Solutions Inc.In Stock: 954591KB640M000DG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AX7MBF4-640.0000C is determined by the following critical parameters:

• Frequency: 640 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)
• Package Dimensions: 7.00mm x 5.00mm (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

The substitute part 591KB640M000DG meets all critical electrical parameters and environmental specifications. Variations in supply voltage (2.5V vs. 1.8V), package configuration (8-SMD vs. 6-SMD), and current consumption are secondary considerations that may require circuit-level evaluation based on application requirements.

Parameter Comparison

Engineering Selection Recommendations

The 591KB640M000DG (Skyworks Solutions Inc., Si591 series) is the qualified substitute for the discontinued AX7MBF4-640.0000C. Both components meet identical electrical specifications for 640 MHz CML oscillator applications with ±25ppm frequency stability and Enable/Disable functionality across the -40°C to 85°C operating range. Both components maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings.

The substitute operates at 1.8V supply voltage compared to the original 2.5V specification. This voltage difference requires verification that the receiving circuit can accommodate the lower supply voltage or that appropriate voltage regulation is implemented. The substitute exhibits higher maximum supply current (110mA vs. 68mA) and operates in a 6-SMD package configuration versus the original 8-SMD layout. Physical footprint compatibility must be confirmed, as both components share identical 7.00mm x 5.00mm dimensions but differ in lead count and internal pinout.

The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 591KB640M000DG directly replace the AX7MBF4-640.0000C without circuit modifications?

A: Direct replacement requires verification of three factors: (1) the receiving circuit's tolerance for 1.8V supply voltage versus the original 2.5V specification, (2) PCB footprint compatibility between 8-SMD and 6-SMD package configurations, and (3) pinout alignment between the two devices. Physical and electrical compatibility must be confirmed before implementation.

Q: What are the key differences between these two oscillators?

A: The primary differences are supply voltage (2.5V vs. 1.8V), package configuration (8-SMD vs. 6-SMD), and current consumption (68mA vs. 110mA maximum). All critical electrical parameters—frequency, output type, stability, temperature range, and enable/disable function—are identical.

Q: Are both components RoHS compliant?

A: Yes, both the AX7MBF4-640.0000C and 591KB640M000DG are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings.

Q: What is the significance of the package dimension match?

A: Both components share identical 7.00mm x 5.00mm footprint dimensions, which simplifies mechanical integration. However, the difference in lead count (8-SMD vs. 6-SMD) means PCB layout and pinout must be individually verified for each design.

Q: Why is the substitute part recommended despite higher current consumption?

A: The 591KB640M000DG is recommended because it maintains all critical electrical specifications (frequency, stability, output type, temperature range) and is in active production. Higher current consumption (110mA vs. 68mA) must be evaluated within the context of the specific application's power budget.