AX7DAF4-270.0000C Equivalent & Substitute Parts

Part Overview

The AX7DAF4-270.0000C is a 270 MHz XO (Standard) LVDS Oscillator manufactured by Abracon LLC as part of the ClearClock™ AX7 series. This surface mount crystal oscillator operates at 3.3V with Enable/Disable functionality in an 8-SMD, No Lead package. The part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	AX7DAF4-270.0000C
Manufacturer	Abracon LLC
Series	ClearClock™ AX7
Frequency	270 MHz
Output Type	LVDS
Supply Voltage	3.3V
Frequency Stability	±25ppm
Operating Temperature Range	-40°C ~ 85°C
Current - Supply (Max)	70mA
Current - Supply (Disable) (Max)	65mA
Package / Case	8-SMD, No Lead
Size / Dimension	0.276" L x 0.197" W (7.00mm x 5.00mm)
Height - Seated (Max)	0.075" (1.90mm)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution for the AX7DAF4-270.0000C 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)
Base Resonator: Crystal (exact match required)
RoHS Status: ROHS3 Compliant (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 consumption variations are noted but do not prevent functional substitution when PCB layout accommodates the alternative package footprint.

Parameter Comparison

Parameter	AX7DAF4-270.0000C	591NB270M000DG	591BB270M000DG	591FB270M000DG
Manufacturer	Abracon LLC	Skyworks Solutions Inc.	Skyworks Solutions Inc.	Skyworks Solutions Inc.
Series	ClearClock™ AX7	Si591	Si591	Si591
Frequency	270 MHz	270 MHz	270 MHz	270 MHz
Output Type	LVDS	LVDS	LVDS	LVDS
Supply Voltage	3.3V	3.3V	3.3V	2.5V
Frequency Stability	±25ppm	±25ppm	±25ppm	±25ppm
Operating Temperature Range	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Current - Supply (Max)	70mA	100mA	100mA	100mA
Current - Supply (Disable) (Max)	65mA	75mA	75mA	75mA
Package / Case	8-SMD, No Lead	6-SMD, No Lead	6-SMD, No Lead	6-SMD, No Lead
Size / Dimension	0.276" L x 0.197" W (7.00mm x 5.00mm)	0.276" L x 0.197" W (7.00mm x 5.00mm)	0.276" L x 0.197" W (7.00mm x 5.00mm)	0.276" L x 0.197" W (7.00mm x 5.00mm)
Height - Seated (Max)	0.075" (1.90mm)	0.071" (1.80mm)	0.071" (1.80mm)	0.071" (1.80mm)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Discontinued at DiGi Electronics	Active	Active	Active

Engineering Selection Recommendations

591NB270M000DG (Skyworks Solutions Inc., Si591 series) is the primary substitute for the AX7DAF4-270.0000C. This part maintains identical electrical specifications including 3.3V supply voltage, 270 MHz frequency, LVDS output, ±25ppm stability, and -40°C ~ 85°C operating range. The part is currently active in production with ROHS3 compliance. Package configuration differs (6-SMD vs. 8-SMD), requiring PCB layout verification. Current consumption is higher (100mA max vs. 70mA), which must be evaluated in power budget calculations.

591BB270M000DG (Skyworks Solutions Inc., Si591 series) provides equivalent electrical performance to 591NB270M000DG with identical supply voltage, frequency, and stability specifications. This part is active and ROHS3 compliant. Selection between 591NB270M000DG and 591BB270M000DG depends on specific application requirements and availability.

591FB270M000DG (Skyworks Solutions Inc., Si591 series) operates at 2.5V supply voltage instead of 3.3V. This part is suitable only for applications designed for 2.5V operation and is not a direct substitute for 3.3V-dependent designs. The part is active in production. RoHS status is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can 591NB270M000DG directly replace AX7DAF4-270.0000C without PCB modifications?

A: Electrical substitution is direct. However, package configuration differs (6-SMD vs. 8-SMD), requiring PCB layout evaluation. Footprint compatibility must be confirmed before assembly.

Q: What is the impact of higher current consumption in the Skyworks substitutes?

A: The substitute parts consume 100mA maximum compared to 70mA for the original part. Power supply and thermal design must accommodate this 30mA increase. Disable mode current is also higher (75mA vs. 65mA).

Q: Is 591FB270M000DG compatible with 3.3V designs?

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

Q: Are all substitute parts ROHS3 compliant?

A: 591NB270M000DG and 591BB270M000DG are confirmed ROHS3 compliant. RoHS status for 591FB270M000DG is not specified in available documentation.

Q: What is the height difference between the original and substitute parts?

A: The original AX7DAF4-270.0000C has a maximum seated height of 0.075" (1.90mm). All Skyworks substitutes have a maximum seated height of 0.071" (1.80mm), a 0.004" reduction. This difference is typically acceptable in standard PCB assembly processes.

Q: Do all parts have the same frequency stability specification?

A: Yes. The original part and all three substitutes maintain ±25ppm frequency stability across the -40°C ~ 85°C operating temperature range.

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