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Product Detailed Parameters
- Description：OPTOISOLTR 5.3KV 1CH TRANS 4-DIP
- Series：SFH628A-3
- Mfr：Isocom Components 2004 LTD
- Package：Tube
- Number of Channels：1
- Voltage - Isolation：5300Vrms
- Current Transfer Ratio (Min)：100% @ 1mA
- Current Transfer Ratio (Max)：320% @ 1mA
- Turn On / Turn Off Time (Typ)：-
- Rise / Fall Time (Typ)：4µs, 3µs
- Input Type：AC, DC
- Output Type：Transistor
- Voltage - Output (Max)：55V
- Current - Output / Channel：50mA
- Voltage - Forward (Vf) (Typ)：1.5V (Max)
- Current - DC Forward (If) (Max)：50 mA
- Vce Saturation (Max)：400mV
- Operating Temperature：-55°C ~ 100°C
- Mounting Type：Through Hole
- Package / Case：4-DIP (0.300", 7.62mm)
- Supplier Device Package：4-DIP
- Grade：-
- Qualification：-
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Overview
The SFH628A-3 is a single-channel optocoupler featuring inverse parallel infrared LEDs and an NPN silicon phototransistor. It supports AC input with a maximum forward current of 50 mA and offers high isolation voltage of 5300 Vrms. The device provides transistor output with a typical rise time of 4 µs and fall time of 3 µs. Current transfer ratio ranges from 100% to 320%, ensuring reliable signal transmission in digital isolation applications.
Feature Summary
- Inverse parallel LED configuration enables direct AC input capability without external rectification
- NPN silicon phototransistor output provides robust digital switching performance
- High dielectric isolation voltage ensures safety in high-voltage circuit separation
Applications
- Logic-to-logic isolation in noisy environments
- Line receiver circuits
- Programmable current level sensors
- Digital control for motors and servo machines
Procurement Notes
Verify the specific suffix matches the required package type, as variations exist between through-hole and surface mount versions. Confirm compliance requirements such as UL or VDE certification if applicable to your design. Ensure the AC input specification aligns with your circuit's voltage levels before ordering.
Selection Notes
Select this component when AC signal isolation is required without additional rectifying components. The inverse parallel LED structure simplifies circuit design compared to standard DC-input optocouplers. Consider the current transfer ratio range to ensure adequate drive capability for the load connected to the phototransistor collector.
Part Context
The SFH628A series includes variants like SFH628A-2 and SFH628A-4, differing primarily in internal LED configurations. Isocom Components manufactures these devices as industry-standard replacements for legacy parts. The brand has a history dating back to the Litronix era, focusing on commercial and industrial optocoupler solutions.
Replacement Considerations
Direct substitutes may include other AC-input optocouplers with similar pinouts and isolation ratings. Verify that replacement parts maintain the same inverse parallel LED architecture to preserve AC compatibility. Check mechanical dimensions for DIP packages if space constraints are critical.
