TT Electronics/Optek Technology OP291A

Each device in this series is a gallium aluminum arsenide infrared LED in an infrared-transmitting package with a peak wavelength of 890 nm, closely matched to the spectral response of silicon phototransistors, except for the OP298AA, which has a peak wavelength of 875 nm. For easy identification, the anode lead of each LED is longer than the cathode lead. T-1 3/4 package devices include: OP290 (A, B, C), OP291A, OP292A, OP294 (A, B, C), OP295 (A, B), OP296 (A, B), OP297A, OP299 (A, B, C), and OP297FAB; plastic TO-18 or TO-46 package devices include: OP293 (A, B) and OP298 (A, B, C, AA).

The OP290 series supports peak pulsed forward current up to 1.5 A, the OP291A up to 100 mA, and the OP292A up to 1 A. The cathode lead is 0.06 inches (1.52 mm) shorter than the anode lead. The silver-copper lead frame provides excellent thermal characteristics.

The OP293 (A, B) has a radiation angle of 60°, while the OP298 (A, B, C) has a radiation angle of 25°. The cathode lead is 0.06 inches (1.52 mm) shorter than the anode lead. These devices are available in multiple power ranges, offering a low-cost alternative to TO-18 or TO-46 hermetic packages.

The OP298AA is a high-irradiance output version with a radiation angle of 25°. The cathode lead is 0.06 inches (1.52 mm) shorter than the anode lead. These devices are available in multiple power ranges, offering a low-cost alternative to TO-18 or TO-46 hermetic packages.

The OP294 and OP299 are designed for low-current or power-limited applications such as battery-powered systems. Similar to the OP290 and OP295, they use a smaller die with increased current density to improve output efficiency at low current levels. Maximum light output is achieved at continuous (DC) forward currents up to 100 mA or pulsed forward currents up to 750 mA. The cathode lead is 0.06 inches (2.52 mm) shorter than the anode lead.

The OP295 (A, B) supports peak pulsed forward current up to 5 A, the OP296 (A, B) up to 2 A, and the OP297A up to 1 A. The cathode lead is 0.06 inches (2.52 mm) shorter than the anode lead. The OP297FAB has reverse polarity compared to the OP297A. The silver-copper lead frame provides excellent thermal characteristics.

These devices are spectrally and mechanically matched to the OP593 and OP598 series phototransistors. For additional design information and reliability (degradation) data, refer to Bulletins 208 and 210.

• Narrow or wide irradiance mode selectable
• Power range selectable
• T-1 3/4, TO-18, or TO-46 package selectable
• Higher power output compared to equivalent GaAs LEDs

• Non-contact reflective object sensor
• Assembly line automation
• Machine automation
• Machine safety
• End-of-travel sensor
• Door sensor
• Battery-powered applications