Features
• Non-Hermetic SMT package
• 1000 VDC electrical isolation
• High CTR
• Small package size
• Radiation tolerant

Description
The OLC249 can be used for large satellite constellation applications that require optical isolation in radiation environments such as gamma, neutron, and proton radiation with a high CTR and low saturation VCE. Each optocoupler consists of an LED and N-P-N silicon phototransistor that is electrically isolated, but optically coupled inside a non-hermetic six-pin Leadless Chip Carrier (LCC) package.
Electrical parameters are similar to the JEDEC registered 4N49 optocoupler, but with a higher CTR and better CTR degradation characteristics due to radiation exposure.
The hermetic surface mount variant of the OLC249 optocoupler is available as the OLS249, both in a non-screened catalog version as well as a high-reliability screened version.
The OLC249 is designed for a low LED operating current while providing excellent radiation tolerance margins.
A functional block diagram of the OLC249 is shown in Figure 1. The absolute maximum ratings of the OLC249 are provided in Table 1. Electrical specifications are provided in Table 2.
Typical performance characteristics of the OLC249 are illustrated in Figures 2 through 4. A typical switching test circuit is shown in Figure 5 and package dimensions for the OLC249 are provided in Figure 6.