This module is a carrier board for TI’s ISO6521 general purpose functional isolator, which enables two channels of galvanically isolated digital communication between two devices at up to 50 Mbps per channel.
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This module is a carrier board for TI’s ISO6521 general purpose functional isolator, which enables two channels of galvanically isolated digital communication between two devices at up to 50 Mbps per channel. It provides one forward channel and one reverse channel, and they default to high in the event of input power or signal loss.
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 behaviour 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.
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). |
ISO652x 2-Channel Digital Isolator Carrier, bottom view with dimensions and a US quarter for size reference. |
| PIN | Type | Description |
|---|---|---|
| VCC1 | Side 1 power supply. Valid ranges: 1.71 V to 1.89 V or 2.25 V to 5.5 V. Note: Side 1 channel output states are undetermined for 1.05 V < VCC1 < 1.71 V and 1.89 V < VCC1 < 2.25 V . | |
| GND1 | Ground connection for VCC1. GND1 is NOT connected to GND2. | |
| VCC2 | Side 2 power supply. Valid ranges: 1.71 V to 1.89 V or 2.25 V to 5.5 V. Note: Side 2 channel output states are undetermined for 1.05 V < VCC2 < 1.71 V and 1.89 V < VCC2 < 2.25 V . | |
| GND2 | Ground connection for VCC2. GND2 is NOT connected to GND1. | |
| INA | input | Input, channel A |
| INB | input | Input, channel B |
| OUTA | output | Output, channel A |
| OUTB | output | Output, channel B |
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.
The ISO652x provides functional isolation with a manufacturer-rated working voltage of 450 VRMS. 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 VRMS of isolation. Please note that these carrier boards are not certified to any particular safety standard.
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. | ||||||||||
Alternatives available with variations in these parameter(s): channel directions default output Select variant…
| Size: | 0.4″ × 0.4″ × 0.11″ |
|---|---|
| Weight: | 0.2 g |
| Maximum data rate: | 50 Mbps |
|---|---|
| Minimum operating voltage: | 1.71 V1 |
| Maximum operating voltage: | 5.5 V1 |
| Channel directions: | 1 forward, 1 reverse |
| Default output: | high |
| Working isolation voltage: | 450 VRMS2 |
| IC part number: | ISO65213 |
| PCB dev codes: | iso04a |
|---|---|
| Other PCB markings: | 0J16170 |
This DXF drawing shows the locations of all of the board’s holes.
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