The BRT21, BRT22, and BRT23 series are optocouplers featuring an optically coupled GaAs IRLED to a photosensitive thyristor system. They include integrated noise suppression and a zero-crossing circuit, making them ideal for isolating low-voltage logic from high-voltage AC lines (120 VAC, 240 VAC, 380 VAC). These devices offer low trigger currents (1.2 mA), high dV/dt ratios (>10 kV/s), and load voltages up to 800 V, suitable for controlling various AC loads like motors, solenoids, and solid-state relays in industrial controls, office equipment, and consumer appliances.
| Model | VDRM (V) | IFT (mA) | ITRMS (mA) | dV/dt (kV/s) | Load Voltage (V) | Package | Agency Approvals |
| BRT21 | 400 | 2 (H) / 1.2 (F) | 300 | > 10 | 800 | DIP-6 | UL, cUL |
| BRT22 | 600 | 2 (H) / 1.2 (F) | 300 | > 10 | 800 | DIP-6 | UL, cUL |
| BRT23 | 800 | 2 (H) / 1.2 (F) | 300 | > 10 | 800 | DIP-6 | UL, cUL |
| BRT21 | 400 | - | 300 | - | - | DIP-6 | UL, cUL, VDE (Option 1) |
| BRT22 | 600 | - | 300 | - | - | DIP-6 | UL, cUL, VDE (Option 1) |
| BRT23 | 800 | - | 300 | - | - | DIP-6 | UL, cUL, VDE (Option 1) |