DATA SHEET OLC449: Radiation-Tolerant Phototransistor Non-Hermetic Surface-Mount Optocoupler Features • Radiation tolerant version of the 4N49U • High current transfer ratio (CTR) is guaranteed: – Over –55 °C to +125 °C ambient temperature range – At LED current of 1mA • 1000 VDC electrical isolation • Same processing and construction as the OLC249, but with a higher CTR Description The OLC449 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 OLC449 optocoupler is available as the OLS449, both in a non-screened catalog version as well as a high-reliability screened version. Figure 1. OLC449 Block Diagram A functional block diagram of the OLC449 is shown in Figure 1. The absolute maximum ratings of the OLC449 are provided in Table 1. Electrical specifications are provided in Table 2. Typical performance characteristics of the OLC449 are illustrated in Figures 2 through 4. A typical switching test circuit is shown in Figure 5 and package dimensions for the OLC449 are provided in Figure 6. The OLC449 is designed for a low LED operating current while providing excellent radiation tolerance margins. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 206214B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without N

Table 1. OLC449 Absolute Maximum Ratings1 Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device. Measured between pins 1, 2, and 6 shorted together, and pins 3, 4, and 5 shorted together. Ta = 25 °C and duration = 1 s. Value applies for Pw < 1 us, PRR < 300 pps. Derate linearly at 3 mW/°C above 25 °C. ESD HANDLING: Although this device is designed...

Table 2. OLC449 Electrical Specifications1 (Ta = 25 °C, Unless Otherwise Noted) 1 Performance is guaranteed only under the conditions listed in the above table. 2 Measured between pins 1, 2, and 6 shorted together, and pins 3, 4, and 5 shorted together. Ta = 25 °C and duration = 1 s. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 206214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • April 20, 2022

DATA SHEET • OLC449: RADIATION-TOLERANT, PHOTOTRANSISTOR NON-HERMETIC SURFACE-MOUNT OPTOCOUPLER (Ta = -55 °C to +125 °C, Unless Otherwise Noted) 0123456789 10 Forward Current (mA) Figure 3. Normalized Collector Current vs Forward Current Figure 4. Normalized CTRce vs Temperature Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 April 20, 2022 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 206214B

DATA SHEET • OLC449: RADIATION-TOLERANT, PHOTOTRANSISTOR NON-HERMETIC SURFACE-MOUNT OPTOCOUPLER Figure 5. OLC449 Switching Test Circuit Figure 6. OLC449 Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 206214A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • Apri

DATA SHEET • OLC449: RADIATION-TOLERANT, PHOTOTRANSISTOR NON-HERMETIC SURFACE-MOUNT OPTOCOUPLER Copyright © 2022 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its...