Overview

These modules are carrier boards or breakout boards for the ISO652x general purpose functional isolators from Texas Instruments; we therefore recommend referring to the ISO652x datasheet for detailed specifications. The ISO652x features two digital channels that enable communication between two galvanically (electrically) isolated devices at up to 50 Mbps per channel. This isolation means that current cannot flow from one side to the other, and incorrect connections or bad voltages on one side cannot propagate through to damage the device on the other side. It also means the logic voltage can be at different levels on the two sides, allowing these carrier boards to function as level shifters.

The four IC versions feature different combinations of channel directions and default output behavior as shown in the table below:

	Pololu Item #	IC part number	Default output	Channels	Max data rate	Working voltage 1	Min PCB Creepage 2	Size	Price
ISO652x carrier	#5746	ISO6520	high	2 forward, 0 reverse	50 Mbps	450 VRMS	2.8 mm	0.4″×0.4″	$1.95
	#5747 (coming soon)	ISO6520F	low
	#5748	ISO6521	high	1 forward, 1 reverse
	#5749 (coming soon)	ISO6521F	low
Note 1: IC component functional isolation rating per manufacturer datasheet.
Note 2: Minimum creepage along PCB surface based on layout design only. Other creepage distances, e.g. along the body of the component, may be lower.

Pinouts of the ISO652x 2-Channel Digital Isolator Carrier series.

Details for item #5748

This version features the ISO6521, which has one forward channel and one reverse channel and defaults to high in the event of input power or signal loss. It can be differentiated from the other versions by the “6521” marking on the IC.

Pinout of the ISO6521/ISO6521F 2-Channel Digital Disolator Carrier (1/1).

Each side must be powered separately across its respective VCCx and GNDx pins, and the voltages on the two sides can be at different levels. The two sides are galvanically isolated (GND1 is NOT connected to GND2).

Schematic diagram of the ISO652x 2-Channel Digital Isolator Carrier.

Isolation rating and board creepage considerations

The ISO652x provides functional isolation with a manufacturer-rated working voltage of 450 V_RMS. The IC package has a clearance and creepage of >2.2 mm, and our carrier PCB has a routed slot under the IC to provide a PCB creepage distance of 2.8 mm. A rough rule of thumb is that uncontaminated FR4 PCBs should have roughly 1 mm of creepage per 100 V_RMS of isolation. Please note that these carrier boards are not certified to any particular safety standard.

Digital Isolator Comparison

The following table shows all our available digital isolator carriers, which are available in different channel counts and with different output defaults.

	Pololu Item #	IC part number	Default output	Channels	Max data rate	Isolation type	Working voltage 1	Min PCB Creepage 2	Size	Price
ISO652x carrier	#5746	ISO6520	high	2 forward, 0 reverse	50 Mbps	functional	450 VRMS	2.8 mm	0.4″×0.4″	$1.95
	#5747 (coming soon)	ISO6520F	low
	#5748	ISO6521	high	1 forward, 1 reverse
	#5749 (coming soon)	ISO6521F	low
ISO654x carrier	#5740	ISO6540	high	4 forward, 0 reverse	50 Mbps	functional	400 VRMS	5.3 mm	0.6″×0.7″	$2.75
	#5741	ISO6540F	low
	#5742	ISO6541	high	3 forward, 1 reverse
	#5743	ISO6541F	low
	#5744	ISO6542	high	2 forward, 2 reverse
	#5745	ISO6542F	low
Note 1: IC component functional isolation rating per manufacturer datasheet.
Note 2: Minimum creepage along PCB surface based on layout design only. Other creepage distances, e.g. along the body of the component, may be lower.