AX7MBF3-640.0000C Equivalent & Substitute Parts

Part Overview

The AX7MBF3-640.0000C is a 640 MHz XO (Standard) CML oscillator manufactured by Abracon LLC, part of the ClearClock™ AX7 series. This component operates at 2.5V supply voltage 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 for ongoing system support and new designs requiring this frequency and output specification.

Key Parameters

Parameter	Value
Frequency	640 MHz
Output Type	CML
Function	Enable/Disable
Supply Voltage	2.5V
Frequency Stability	±25ppm
Operating Temperature Range	-40°C ~ 85°C
Package Type	8-SMD, No Lead
Physical Dimensions	7.00mm x 5.00mm
Maximum Height	1.90mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AX7MBF3-640.0000C is determined by the following critical parameters:

Frequency Match: 640 MHz (exact match required)
Output Format: CML (CMOS/ECL compatible logic)
Enable/Disable Function: Required for power management compatibility
Frequency Stability: ±25ppm (tolerance specification)
Operating Temperature Range: -40°C ~ 85°C (environmental specification)
Physical Footprint: 7.00mm x 5.00mm (PCB layout constraint)
Regulatory Compliance: ROHS3 Compliant, MSL 1

The substitute part 591KB640M000DG from Skyworks Solutions Inc. meets all critical electrical specifications and environmental requirements. Differences in supply voltage (1.8V vs. 2.5V), package configuration (6-SMD vs. 8-SMD), and current consumption are secondary considerations that require circuit-level evaluation but do not preclude functional substitution.

Parameter Comparison

Parameter	AX7MBF3-640.0000C (Abracon)	591KB640M000DG (Skyworks)	Compatibility Notes
Frequency	640 MHz	640 MHz	Exact match
Output Type	CML	CML	Exact match
Function	Enable/Disable	Enable/Disable	Exact match
Supply Voltage	2.5V	1.8V	Different; requires power supply adjustment
Frequency Stability	±25ppm	±25ppm	Exact match
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	Exact match
Package Type	8-SMD, No Lead	6-SMD, No Lead	Different pin count; PCB redesign required
Physical Dimensions	7.00mm x 5.00mm	7.00mm x 5.00mm	Exact match
Maximum Height	1.90mm	1.80mm	Compatible; substitute is lower profile
Current - Supply (Max)	68mA	110mA	Substitute draws higher current
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Exact match
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Exact match

Engineering Selection Recommendations

The 591KB640M000DG from Skyworks Solutions Inc. is an active product with current manufacturing status, providing supply continuity for the discontinued AX7MBF3-640.0000C. Both components maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility.

Selection of the Skyworks substitute requires evaluation of the following circuit-level factors:

Power Supply Architecture: The 1.8V supply requirement necessitates verification that system power distribution can accommodate this voltage level or that a dedicated regulator is implemented.
Package Reconfiguration: The transition from 8-SMD to 6-SMD pinout requires PCB layout modification and schematic signal routing verification.
Current Budget: Maximum supply current increases from 68mA to 110mA; thermal and power delivery analysis is required.
Signal Integrity: CML output compatibility must be confirmed with downstream receiver specifications.

Both components are suitable for applications requiring 640 MHz CML oscillators with Enable/Disable control across the -40°C to 85°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can the 591KB640M000DG directly replace the AX7MBF3-640.0000C without PCB modification?

A: No. The substitute uses a 6-SMD package versus the original 8-SMD configuration, requiring PCB footprint redesign and signal routing verification. Additionally, the 1.8V supply voltage differs from the original 2.5V specification.

Q: Are the physical dimensions compatible?

A: The footprint dimensions (7.00mm x 5.00mm) are identical. The substitute has a lower maximum height (1.80mm vs. 1.90mm), which is compatible with existing clearance specifications.

Q: What is the impact of the different supply voltages?

A: The substitute operates at 1.8V instead of 2.5V. This requires either a dedicated 1.8V power supply rail or a voltage regulator. CML output levels will be scaled accordingly to the lower supply voltage.

Q: Is the frequency stability specification identical?

A: Yes. Both components specify ±25ppm frequency stability, meeting the same timing accuracy requirements.

Q: What are the compliance implications of using the substitute?

A: Both components are ROHS3 compliant with MSL 1 rating. No compliance degradation occurs with substitution.

Q: Does the higher current consumption of the substitute affect system design?

A: The substitute draws 110mA maximum versus 68mA for the original. Power delivery and thermal management must be re-evaluated to accommodate the 42mA increase.

Q: Are both components suitable for the same operating temperature range?

A: Yes. Both components operate across -40°C to 85°C, maintaining identical environmental specifications.

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