This Product Selection Guide contains information to help select products in the Special Purpose Isolators category on DigiKey.com
Special purpose isolators use one and two-channel optoelectronic circuits to perform specific tasks such as I2C repeaters, line receivers, current loop receivers and transmitters, optical power converters, photocell optocouplers, power MOSFETs, and power transistor drivers. Mounting types include surface, through-hole and free-hanging. Voltage supply and output current are among the key differentiation parameters.
SelectionCharacteristics
Type: Indicates which special function the device is designed to accomplish.
Number of Channels: The number of separate isolation channels available within the device.
Voltage - Isolation: The maximum voltage difference that can be observed across the device’s isolation barrier before breakdown occurs and isolation is lost.
Common Mode Transient Immunity (Min): Characterizes a rate of voltage change across a device’s isolation barrier that if exceeded may be expected to cause errors in the signal(s) being transmitted through a device.
Input Type: Indicates which signal type the device is designed to accept on its input side.
Current - Output / Channel: Typically this indicates the maximum current an output channel can provide.
Propagation Delay tpLH / tpHL (Max): Characterizes signal transmission delays introduced by a device, for both low->high and high->low signal transitions.
Rise / Fall Time (Typ): Characterizes the amount of time required for a device output to transition from low to high/high to low states, which are commonly defined as 10% and 90% of the supply voltage that powers the output being measured.
Voltage - Forward (Vf) (Typ): Characterizes the device’s forward voltage drop across its internal diodes while in an Off state.
Current - DC Forward (If) (Max): Characterizes the device’s forward current through its internal diodes while in an ‘On’ state.
Voltage - Supply: Typically represented by a range, this indicates the low and high voltage limits which one can expect standard operation. Voltages outside this range may damage the device and other system components.
Operating Temperature: Recommended operating temperature, typically given in a range or as a maximum. Exceeding these temperatures may affect performance or damage the device and other system components.
Mounting Type: Indicates how the device is attached.
Package / Case: Indicates the type of protective case used on an electronic component to allow easy handling, installation, and protection. This selection was determined to be the closest industry standard applicable to the supplier device packaging. Typically it is best to check the actual dimensions from the datasheet rather than depend on this terminology when designing your circuit.
Supplier Device Package: This is what the manufacturer calls the package of this device. They are manufacturer specific. It is typically best to use the actual dimensions from the datasheets rather than to go by this terminology when designing your circuit.
Approval Agency: An indication that the product meets the minimum safety standards of an approving agency. These agencies are either government entities or private third-party labs that protect consumer safety.
ProductExamples
| MFR PART # | NSL-32 |
|---|---|
| DIGIKEY PART # | NSL-32-ND |
| MANUFACTURER | Advanced Photonix |
| DESCRIPTION | Optoisolator Photocell Optocoupler 1 Channel |
| DATASHEET | Click Here |
| MFR PART # | AFBR-POC206L |
|---|---|
| DIGIKEY PART # | 516-3890-ND |
| MANUFACTURER | Broadcom Limited |
| DESCRIPTION | Optoisolator Optical Power Converter 1 Channel |
| DATASHEET | Click Here |
| MFR PART # | GLI-BNCPJPT-1 |
|---|---|
| DIGIKEY PART # | 4958-GLI-BNCPJPT-1-ND |
| MANUFACTURER | Triplett |
| DESCRIPTION | Optoisolator 1 Channel |
| DATASHEET | Click Here |
| MFR PART # | HCPL-2602-000E |
|---|---|
| DIGIKEY PART # | 516-1662-5-ND |
| MANUFACTURER | Broadcom Limited |
| DESCRIPTION | Optoisolator Line Receiver 3750Vrms 1 Channel 8-DIP |
| DATASHEET | Click Here |
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MediaLinks
Articles
Galvanic Isolation for IoT Sensors
Linear Optical Isolation for Safe Sensor Operation
Product Training Modules
Introduction to Optoisolators - TT Electronics