SMP-74 Photo-MOSFET Relay
The SMP-74 Series is a general-purpose, solid-state Photo-MOSFET relay designed for compact, high-performance electronic systems. Featuring a Form B (normally closed) contact configuration, it supports switching up to 400 V AC or peak DC and load currents up to 90 mA, making it ideal for medium-power applications requiring high isolation and reliability.
With a typical on-resistance of 28 Ω, ultra-low output capacitance of 1.3 pF, and minimal off-state leakage current of 1 µA, the SMP-74 Series ensures clean signal transitions and high signal integrity. Its solid-state design eliminates contact bounce and mechanical wear, offering superior resistance to shock, vibration, and environmental contaminants.
Available in SOP, SMD, and DIP packages with multiple pin configurations (4, 6, or 8 pins), the SMP-74 Series is optimized for switching both low-level analog signals and higher-level loads such as LEDs, relays, solenoids, and lamps. Its high input-to-output isolation and long operational life make it a dependable solution for industrial, medical, and test environments.
Standards and Certifications
- Solid-state switching with no contact bounce or mechanical degradation
- Form B (normally closed) configuration for fail-safe designs
- High voltage switching capability (up to 400 V AC/DC)
- Ultra-low output capacitance (1.3 pF) for clean signal transitions
- Minimal off-state leakage (1 µA) for high signal fidelity
- High input-to-output isolation for safe circuit separation
- Available in SOP, SMD, and DIP packages with multiple pin counts
- Shock and vibration resistant, impervious to dirty environments
- Stable on-resistance over time for consistent performance
- Long operational life with high reliability in solid-state form
| Contact Form | 1B, 2B |
| Package Style (Pin Count) | DIP(4, 6, 8), SMD(4, 6, 8), SOP(4, 8) |
| Load Voltage (V) AC/DC | 400 |
| Load Current Max. (mA) | 90 |
| LED Operate Current Typ/Max. (mA) | 0.9/3.0 |
| On Resistance Typ/Max. (Ω) | 28/30 |
| Output Capacitance (pF) | 1.3 |
| Off-State Leakage (μA) | 1 |
- Automated Test Equipment (ATE): Reliable switching for precision testing
- Electric Vehicles: Medium-power control in battery and power systems
- I/O Modules: Signal routing and isolation in industrial automation
- Medical Equipment: Safe, low-noise switching in diagnostic and monitoring devices
- Sensing Equipment: Clean signal control in precision instrumentation
- Solar Battery Management: Efficient switching in renewable energy systems
- Telecommunications: Compact relay replacement in communication systems
- Security Systems: Silent, dependable switching in access control and alarm systems