AX7MBF4-156.2500C Equivalent & Substitute Parts

Part Overview

The AX7MBF4-156.2500C is a 156.25 MHz XO (Standard) CML Oscillator manufactured by Abracon LLC as part of the ClearClock™ AX7 series. This surface mount 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 equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

AX7MBF4-156.2500C

Abracon LLCIn Stock: 1175AX7MBF4-156.2500C Datasheet

Current PartRFQ

590HB156M250DG

Skyworks Solutions Inc.In Stock: 1216590HB156M250DG Datasheet

MFR RecommendedRFQ

591KB156M250DG

Skyworks Solutions Inc.In Stock: 730591KB156M250DG Datasheet

MFR RecommendedRFQ

AX7MCF1-156.2500C

Abracon LLCIn Stock: 749AX7MCF1-156.2500C Datasheet

MFR RecommendedRFQ

AX7MCF3-156.2500C

Abracon LLCIn Stock: 1074AX7MCF3-156.2500C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AX7MBF4-156.2500C is determined by the following critical parameters:

• Frequency: 156.25 MHz (exact match required)
• Output Type: CML (exact match required)
• Function: Enable/Disable (exact match required)
• Frequency Stability: ±25ppm (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Base Resonator: Crystal (exact match required)

The substitute parts are grouped into two categories based on supply voltage compatibility:

Category 1: 2.5V Supply Voltage (Direct Functional Equivalent)

• 590HB156M250DG (Skyworks Solutions Inc., Si590 series)

Category 2: 1.8V Supply Voltage (Voltage-Dependent Substitutes)

• 591KB156M250DG (Skyworks Solutions Inc., Si591 series)
• AX7MCF1-156.2500C (Abracon LLC, ClearClock™ AX7 series)
• AX7MCF3-156.2500C (Abracon LLC, ClearClock™ AX7 series)

Parameter Comparison

Engineering Selection Recommendations

For 2.5V Supply Voltage Systems: The 590HB156M250DG (Skyworks Solutions Inc., Si590 series) is the direct functional equivalent. This part maintains the same 2.5V supply voltage, 156.25 MHz frequency, CML output, and Enable/Disable function. The part is currently active and available. Package differences exist: the 590HB uses a 6-SMD, No Lead package versus the 8-SMD, No Lead package of the AX7MBF4. Maximum supply current is higher at 110mA compared to 68mA. Height is reduced to 0.071" (1.80mm) versus 0.075" (1.90mm). ROHS3 compliance status is not specified for this part.

For 1.8V Supply Voltage Systems: Three substitute options are available for designs requiring 1.8V operation:

1. 591KB156M250DG (Skyworks Solutions Inc., Si591 series) - Active product status. Uses 6-SMD, No Lead package with 0.071" (1.80mm) maximum height. Maximum supply current is 110mA.

2. AX7MCF1-156.2500C (Abracon LLC, ClearClock™ AX7 series) - Discontinued at DiGi Electronics. Maintains the same 8-SMD, No Lead package and 0.075" (1.90mm) height as the original part. ROHS3 compliant. Maximum supply current is 68mA.

3. AX7MCF3-156.2500C (Abracon LLC, ClearClock™ AX7 series) - Discontinued at DiGi Electronics. Identical specifications to AX7MCF1-156.2500C. ROHS3 compliant. Maximum supply current is 68mA.

All substitute parts maintain the same frequency stability (±25ppm), operating temperature range (-40°C ~ 85°C), and moisture sensitivity level (MSL 1, Unlimited).

Frequently Asked Questions (FAQ)

Q: Can the 590HB156M250DG be used as a direct replacement for the AX7MBF4-156.2500C?

A: The 590HB156M250DG is functionally equivalent for applications requiring 2.5V supply voltage. Both parts operate at 156.25 MHz with CML output, Enable/Disable function, and ±25ppm frequency stability. However, the package differs: 590HB uses 6-SMD, No Lead versus 8-SMD, No Lead for the AX7MBF4. The 590HB also has higher maximum supply current (110mA versus 68mA) and reduced height (0.071" versus 0.075"). PCB layout and power supply design must accommodate these differences.

Q: What is the difference between the 591KB156M250DG and the 1.8V Abracon substitutes?

A: Both the 591KB156M250DG and the Abracon 1.8V options (AX7MCF1-156.2500C and AX7MCF3-156.2500C) operate at 1.8V with identical frequency, output type, and stability specifications. The primary differences are package configuration and supply current. The 591KB uses a 6-SMD, No Lead package with 110mA maximum supply current, while the Abracon parts use 8-SMD, No Lead packages with 68mA maximum supply current. The Abracon parts maintain the same package footprint as the original AX7MBF4.

Q: Are all substitute parts ROHS3 compliant?

A: The Abracon substitute parts (AX7MCF1-156.2500C and AX7MCF3-156.2500C) are specified as ROHS3 compliant. ROHS3 compliance status is not specified in the provided data for the Skyworks Solutions parts (590HB156M250DG and 591KB156M250DG).

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by exact matching of the following parameters: frequency (156.25 MHz), output type (CML), function (Enable/Disable), frequency stability (±25ppm), operating temperature range (-40°C ~ 85°C), and base resonator type (Crystal). Supply voltage is a critical design parameter that may require circuit modifications if changed from 2.5V to 1.8V.

Q: Can I use a 1.8V substitute in a 2.5V circuit?

A: No. The 1.8V substitute parts (591KB156M250DG, AX7MCF1-156.2500C, AX7MCF3-156.2500C) are designed for 1.8V supply voltage operation. Using them in a 2.5V circuit will result in improper operation or device damage. Conversely, the 2.5V part (590HB156M250DG) cannot be used in 1.8V circuits.

Q: What is the impact of package differences on PCB design?

A: The Skyworks Solutions parts (590HB156M250DG and 591KB156M250DG) use 6-SMD, No Lead packages, while the Abracon parts use 8-SMD, No Lead packages. This affects PCB footprint, trace routing, and component placement. The Skyworks parts also have reduced height (0.071" versus 0.075"), which may impact clearance considerations. PCB layout must be verified for compatibility with the selected substitute part.