NASA REQUIRES FIVE VARIATIONS OF SHORT-WAVE INFRARED (SWIR) INGAAS PHOTODIODE SUBASSEMBLIES FOR THE PLANKTON, AEROSOL, CLOUD, OCEAN ECOSYSTEM (PACE) MISSION. AS DESCRIBED IN NASA S REQUEST FOR PROPOSAL, OCI-DET-SOW-0067 AND OCI-DET-SPEC- 0015 DOCUMENTS, THE PRIMARY TECHNICAL CHALLENGE FOR THESE INGAAS PHOTODIODES IS TO ACHIEVE A CAPACITANCE LESS THAN 11 PF AT NEAR PHOTOVOLTAIC OPERATION WITH AN ACTIVE AREA DIAMETER OF 350&#61549;M. SUCH A LOW CAPACITANCE DEVICE REQUIRES AN INGAAS PHOTODIODE STRUCTURE HAVING A CAPACITANCE PER UNIT AREA OF<114 PF / MM2 AT A REVERSE BIAS OF 100 MV. ALSO, THESE DEVICES MUST WITHSTAND A PROTON RADIATION UP TO A FLUENCE LEVEL OF 2E10 / CM2 FOR AN ENVISIONED 3-YEAR LONG MISSION. THESE PHOTODIODES MUST BE INTEGRATED WITH JFET AMPLIFIERS IN A KOVAR PACKAGE, BOTH SUPPLIED BY NASA GODDARD SPACE FLIGHT CENTER (GSFC), TO MANUFACTURE SPACE-QUALIFIED PHOTODIODE SUBASSEMBLIES. DISCOVERY SEMICONDUCTORS SUBMITTED A PROPOSAL, TITLED SHORT-WAVE INFRARED INGAAS PHOTODIODE FOR OPTICAL COLOR INSTRUMENT (OCI) OF PACE MISSION, ON NOVEMBER 30, 2018. THE PROPOSAL LEVERAGED OUR PRIOR WORK IN DEVELOPING RAD-HARD, ULTRA-LOW NOISE, LARGE AREA INGAAS QUADRANT PHOTORECEIVERS FOR THE LASER INTERFEROMETER SPACE ANTENNA (LISA) MISSION, TO MANUFACTURE THE PACE PHOTODIODE FLIGHT UNITS. NASA REVIEWED OUR PROPOSAL AND SUGGESTED SPLITTING THE ACTIVITIES INTO THE FOLLOWING THREE OPTIONS FOR BUDGETARY REASONS: OPTION 1: PROCESS 350&#61549;M DIAMETER PHOTODIODE CHIPS, AND DELIVER 10 CHIPS IN DIE FORM IN A GEL-PAK. OPTION 2: DESIGN AND MANUFACTURE (1) PHOTODIODE SUBMOUNT, (2) MOTHERBOARD SUBSTRATE, AND (3) CONTAINER NEEDED TO DEVELOP THE PHOTODIODE SUBASSEMBLY FLIGHT UNITS. WE WILL DELIVER 10 PHOTODIODE CHIPS MOUNTED ON PHOTODIODE SUBMOUNT AND MOTHERBOARD SUBSTRATE. OPTION 3: MANUFACTURE AND DELIVER 18 PHOTODIODE SUBASSEMBLY FLIGHT UNITS AND 18 FLIGHT SPARES WITH SUPPORTING DOCUMENTATION. DISCOVERY ANTICIPATES THE ENTIRE EFFORT TO BE FUNDED AND WILL PERFORM THE VARIOUS TECHNICAL TASKS AS DESCRIBED IN OUR ORIGINAL PROPOSAL SUBMITTED ON NOVEMBER 30, 2018. THIS ADDENDUM DEFINES THE TASKS CATEGORIZED ACCORDING TO THE THREE OPTIONS AND THE CORRESPONDING BUDGET.