The SMP-21 Photo-MOSFET Relay series is a solid-state relay featuring switching up to 40V AC or peak DC, in a very SOP (small-outline package). It also features a low output capacitance of 13pF and a low off-state leakage current of 10nA. Photo-MOSFET Relays also feature fast switching, no contact bounce, low noise, impervious to dirty environments, shock/vibration proof, extremely high input to output isolation, control low-level analog signals to high-level loads: (LED’s, relays, lamps, solenoids). The added benefit of stable on resistance, long life and high reliability make the SMP-21 Photo-MOSFET Relay series ideal in many applications.
| 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), Electric Vehicles, I/O Modules, Industrial, Medical Equipment, Sensing Equipment, Telecommunications & Security Equipment
Series Data Sheet (PDF)
| Item No. | Datasheet | Distributor | Region | Quantity | Cart | RFQ | Inventory Date |
|---|---|---|---|---|---|---|---|
| SMP-1A21-4PT | Digi-Key Electronics | Americas | 1,300 | BUY | RFQ | 2024-12-08 | |
| SMP-1A21-4PT | MASTER/ONLINE | Americas | 0 | RFQ | 2024-12-10 | ||
| SMP-1A21 | Standex Factory | Americas | 0 | RFQ | 2024-12-10 | ||
| SMP-1A21-4PT | Mouser Electronics | Americas | 194 | BUY | RFQ | 2024-12-10 | |
| SMP-1A21-4PT | Arrow Electronics | Americas | 89 | BUY | RFQ | 2024-12-10 | |
| SMP-1A21-4PT | Digi-Key Electronics | Americas | 1,300 | BUY | RFQ | 2024-12-08 | |
| SMP-1A21-4PT | MASTER/ONLINE | Americas | 0 | RFQ | 2024-12-10 | ||
| SMP-1A21 | Standex Factory | Americas | 0 | RFQ | 2024-12-10 | ||
| SMP-1A21-4PT | Mouser Electronics | Americas | 194 | BUY | RFQ | 2024-12-10 | |
| SMP-1A21-4PT | Arrow Electronics | Americas | 89 | BUY | RFQ | 2024-12-10 |
Welcome to Standex Electronics' RF Reed Relays Part I training module. Reed relays have long been known to have the capability to switch and carry RF signals and fast digital pulses. Hardly anyone thought reed relays were capable of switching and carrying RF up to 20 GHz, because the reed switch's leads are composed of nickel/iron which has a relatively high permeability or (MU). However, 20GHz is now a reality at Standex Electronics. We will be presenting the reasons Standex Electronics and their design team have made this possible.
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