SMP-21 Photo-MOSFET Relay
The SMP-21 Series is a compact, solid-state Photo-MOSFET relay designed for reliable switching in space-constrained and high-performance electronic systems. Housed in a small-outline package (SOP), it supports switching up to 40 V AC or peak DC and load currents up to 250 mA, making it ideal for low- to medium-power applications.
With a typical on-resistance of just 0.9 Ω, low output capacitance (13 pF), and minimal off-state leakage current (10 nA), the SMP-21 Series ensures clean, efficient signal control. Its solid-state design eliminates contact bounce, enhances durability, and provides immunity to shock, vibration, and environmental contaminants.
This series is well-suited for controlling 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 choice for demanding industrial, medical, and test environments.
Standards and Certifications
- Solid-state switching with no contact bounce or mechanical wear
- Low on-resistance (typ. 0.9 Ω) for efficient power handling
- Low output capacitance (13 pF) for fast, clean signal transitions
- Minimal off-state leakage (10 nA) for high signal integrity
- High input-to-output isolation for safe circuit separation
- Compact SOP package (4- or 8-pin) for space-constrained designs
- 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 | 1A, 2A |
| Package Style (Pin Count) | SOP (4, 8) |
| Load Voltage (V) AC/DC | 40 |
| Load Current Max. (mA) | 250 |
| LED Operate Current Typ/Max. (mA) | 0.3/3.0 |
| On Resistance Typ/Max. (Ω) | 0.9/1.25 |
| Output Capacitance (pF) | 13 |
| Off-State Leakage (nA) | 10 |
- Automated Test Equipment (ATE): Fast, reliable signal switching
- Electric Vehicles: Low-power control in battery management systems
- I/O Modules: Signal routing and isolation in industrial automation
- Medical Equipment: Safe, low-noise switching in diagnostic devices
- Sensing Equipment: Clean signal control in precision instruments
- Telecommunications: Relay replacement in compact communication systems
- Security Systems: Silent, reliable switching in access control and alarms