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Product Detailed Parameters
- Description：OPTOISO 0.5KV TRANS W/BASE 6-DIP
- Series：4N2X
- Mfr：Lite-On Inc.
- Package：Tube
- Number of Channels：1
- Voltage - Isolation：500Vrms
- Current Transfer Ratio (Min)：10% @ 10mA
- Current Transfer Ratio (Max)：-
- Turn On / Turn Off Time (Typ)：-
- Rise / Fall Time (Typ)：3µs, 3µs
- Input Type：DC
- Output Type：Transistor with Base
- Voltage - Output (Max)：30V
- Current - Output / Channel：100mA
- Voltage - Forward (Vf) (Typ)：1.2V
- Current - DC Forward (If) (Max)：80 mA
- Vce Saturation (Max)：500mV
- Operating Temperature：-55°C ~ 100°C
- Mounting Type：Through Hole
- Package / Case：6-DIP (0.400", 10.16mm)
- Supplier Device Package：6-DIP
- Grade：-
- Qualification：-
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Overview
The Lite-On 4N28M is a single-channel transistor-output optocoupler housed in a six-pin PDIP package. It provides electrical isolation between control and load circuits with a maximum insulation voltage of 500 Vrms. The device features an NPN phototransistor output capable of handling a maximum collector current of 100 mA and a collector-emitter voltage of 30 V. Key electrical parameters include a nominal current transfer ratio of 10%, a maximum forward current of 80 mA, and a typical rise/fall time of 10 µs. It operates within a temperature range of -55°C to +100°C.
Feature Summary
- Provides galvanic isolation for signal transmission between circuits of different potentials
- Utilizes an NPN phototransistor output for reliable switching applications
- Designed for general-purpose use in industrial and consumer electronics
Applications
- Input/Output (I/O) interfaces for computers
- Signal transmission in system appliances
- Isolation in measuring instruments
Procurement Notes
Verify the specific manufacturer suffix or lot code upon ordering, as the 4N28M designation is utilized by multiple semiconductor vendors including Fairchild and Lite-On. Confirm RoHS compliance status directly with the supplier, as historical data indicates variations across manufacturers. Ensure the selected component matches the required DIP-6 package dimensions and pinout configuration for your PCB layout.
Selection Notes
Select this component when a standard NPN output optocoupler is required for basic isolation tasks. Consider the 10% nominal current transfer ratio for logic-level interfacing. Evaluate the 500 Vrms isolation rating against your system's safety requirements. Compare performance against the 4N25M, 4N26M, and 4N27M if higher speed or different CTR specifications are needed.
Part Context
The 4N28M belongs to a family of general-purpose phototransistor optocouplers that share identical pinouts and mechanical dimensions. This family includes variants such as the 4N25M, 4N26M, 4N27M, 4N35M, 4N36M, and 4N37M. These devices are widely used in legacy and modern designs requiring cost-effective electrical isolation.
Replacement Considerations
Direct pin-compatible substitutes include the 4N25M, 4N26M, 4N27M, 4N35M, 4N36M, and 4N37M. Verify that the replacement part meets the specific Current Transfer Ratio (CTR) and isolation voltage requirements of the original design.
