AX7DAF1-270.0000C Equivalent & Substitute Parts

Part Overview

The AX7DAF1-270.0000C 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 currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

AX7DAF1-270.0000C

Abracon LLCIn Stock: 738AX7DAF1-270.0000C 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 eligibility for the AX7DAF1-270.0000C 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)
• 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)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

The substitute parts listed below meet all critical electrical and mechanical parameters. Package configuration differences (8-SMD vs. 6-SMD) and current supply variations are noted but do not preclude functional substitution when board layout and thermal management accommodate the differences.

Parameter Comparison

Engineering Selection Recommendations

591NB270M000DG and 591BB270M000DG are direct functional equivalents to the AX7DAF1-270.0000C. Both are manufactured by Skyworks Solutions Inc. as part of the active Si591 series and maintain identical electrical specifications including 3.3V supply voltage, 270 MHz frequency, LVDS output, and ±25ppm frequency stability. Both parts are ROHS3 compliant and carry MSL 1 rating. The transition from 8-SMD to 6-SMD packaging and the increase in maximum supply current from 70mA to 100mA are within acceptable design margins for most applications. Both parts are currently in active production status with confirmed inventory availability.

591FB270M000DG operates at 2.5V supply voltage rather than 3.3V and is suitable only for designs with 2.5V power rails. This part is not recommended as a direct substitute for 3.3V applications without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can 591NB270M000DG directly replace AX7DAF1-270.0000C on existing PCBs?

A: The 591NB270M000DG maintains identical footprint dimensions (7.00mm x 5.00mm) and is 0.1mm shorter in seated height (1.80mm vs. 1.90mm). The transition from 8-SMD to 6-SMD packaging requires PCB layout verification to confirm pad compatibility. Electrical performance is equivalent across all critical parameters.

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

A: Both parts are functionally equivalent 270 MHz LVDS oscillators with 3.3V supply and ±25ppm stability. The primary difference is internal architecture within the Si591 series. Selection between these two parts is based on availability and procurement lead time.

Q: Why does 591FB270M000DG have different supply voltage?

A: The 591FB270M000DG is designed for 2.5V applications and is not interchangeable with the 3.3V AX7DAF1-270.0000C without circuit modification. Use this part only in designs with 2.5V power distribution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The AX7DAF1-270.0000C and all listed substitutes (591NB270M000DG, 591BB270M000DG, 591FB270M000DG) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the impact of increased maximum supply current in substitute parts?

A: The substitute parts specify 100mA maximum supply current compared to 70mA for the original part. This represents a design margin increase and does not negatively impact existing power supply designs. Thermal management and current budgeting should account for the higher specification.