AX7DAF3-270.0000C Equivalent & Substitute Parts

Part Overview

The AX7DAF3-270.0000C is a 270 MHz XO (Standard) LVDS Oscillator manufactured by Abracon LLC, part of the ClearClock™ AX7 series. This surface mount crystal oscillator operates at 3.3V with Enable/Disable functionality and is housed in an 8-SMD, No Lead package. The part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

AX7DAF3-270.0000C

Abracon LLCIn Stock: 1132AX7DAF3-270.0000C Datasheet

Current PartRFQ

591BB270M000DG

Skyworks Solutions Inc.In Stock: 1275591BB270M000DG Datasheet

MFR RecommendedRFQ

591FB270M000DG

Skyworks Solutions Inc.In Stock: 1059591FB270M000DG Datasheet

MFR RecommendedRFQ

591NB270M000DG

Skyworks Solutions Inc.In Stock: 951591NB270M000DG Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the AX7DAF3-270.0000C is determined by the following critical parameters:

• Frequency: 270 MHz (exact match required)
• Output Type: LVDS (exact match required)
• Supply Voltage: 3.3V (exact match required for primary substitutes)
• 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)
• RoHS Status: ROHS3 Compliant (exact match required)
• MSL Rating: 1 (Unlimited) (exact match required)

The substitute parts identified are all from Skyworks Solutions Inc., Si591 series. These parts maintain identical electrical specifications and compliance certifications. Package differences (6-SMD vs. 8-SMD) and current consumption variations are noted but do not prevent functional substitution in applications where PCB layout can accommodate the alternative package footprint.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (3.3V Supply):

591NB270M000DG and 591BB270M000DG are direct functional equivalents for the AX7DAF3-270.0000C. Both maintain 3.3V supply voltage, identical frequency and stability specifications, and active product status. The transition from 8-SMD to 6-SMD packaging requires PCB layout verification to confirm footprint compatibility. Maximum supply current increases from 70mA to 100mA; designs must confirm power delivery capability. Both parts are ROHS3 compliant with MSL 1 rating.

Alternative Substitute (2.5V Supply):

591FB270M000DG operates at 2.5V supply voltage instead of 3.3V. This part is suitable only for applications where the power supply architecture supports 2.5V operation. All other electrical and compliance parameters remain equivalent. This substitute requires system-level voltage compatibility assessment.

All substitute parts are manufactured by Skyworks Solutions Inc. and carry active product status, ensuring long-term availability and supply chain stability compared to the discontinued Abracon part.

Frequently Asked Questions (FAQ)

Q: Can 591NB270M000DG directly replace AX7DAF3-270.0000C without PCB modification?

A: Electrical substitution is direct. However, package transition from 8-SMD to 6-SMD requires PCB footprint verification. Physical dimensions (length and width) are identical at 7.00mm x 5.00mm, but lead count and arrangement differ. PCB layout review is necessary.

Q: What is the impact of increased maximum supply current (100mA vs. 70mA)?

A: The substitute parts draw up to 100mA compared to the original 70mA maximum. Power supply and decoupling capacitor sizing must accommodate this higher current draw. Thermal management and power dissipation should be re-evaluated in the application circuit.

Q: Is 591FB270M000DG compatible with 3.3V systems?

A: No. The 591FB270M000DG operates at 2.5V supply voltage. It is not compatible with 3.3V-only systems. Use 591NB270M000DG or 591BB270M000DG for 3.3V applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitutes (591NB270M000DG, 591BB270M000DG, and 591FB270M000DG) are ROHS3 compliant with MSL 1 (Unlimited) rating, matching the original part's compliance profile.

Q: What is the difference between 591NB270M000DG and 591BB270M000DG?

A: Both parts are electrically identical 3.3V, 270 MHz LVDS oscillators with Enable/Disable function. The primary difference is packaging designation within the Si591 series. Both are suitable substitutes for the AX7DAF3-270.0000C.