MIL-PRF-39007, RESISTORS

APPLICATION NOTES FOR MIL-PRF-39007

1) The maximum resistance value of preferred wirewound resistors is constrained by the size of the wire used in their construction. Wire size of less than 0.001 inch (0.03 mm) in nominal diameter is not recommended for NASA use.

2) Space Level Product: MIL-PRF-39007 includes a Space Level Quality option designated by the letter "T" in the failure rate level character of the part number. "T" level product receives additional screening and inspection at the manufacturer prior to delivery. This inspection includes additional testing beyond the basic requirements, specifically

Thermal Shock
Short-time Overload
Dielectric Withstanding Voltage
Radiographic Inspection
Lot Sample Destructive Physical Analysis

In addition, suppliers are required to maintain "S" failure rate level, qualify product through 100 thermal cycles and certify that their product meets the outgassing requirements of NASA Publication 1124. Consult with the supplier to determine their current "T" level qualification status.