Test & Lab Services Fine & Gross Leak Testing via Radiflo® Radioisotope: Krypton–85 (Kr85) Hermeticity Lab Services Micross’ Fine & Gross leak testing service for hermetically packaged semiconductor devices relies on the use of Krypton–85 Radioisotope, a tracer gas and the Radiflo® process. This highly sensitive method, initially developed in 1955 and benefiting from continuous enhancements and simplification of isotope handling has delivered to the industry a highly accurate, sophisticated method for performing hermeticity validation testing. This method provides the benefit of being extremely fast while providing improved leak rate detection to <10-12 atm cc/sec. Additionally, the Radiflo® process is currently one of very few methods which will perform both Fine & Gross leak while mitigating risk for test escapees associated with Fluorocarbon masking. It therefore is considered a preferred method for components being sourced to critical Aerospace, Military and Medical platforms Test Procedure The Krypton–85 equation is defined as: QS = R (S)(K)(T)(P)(t) QS = Leak reject rate (atm cc/sec Kr) R = Detector reject level (cpm) S = Specific activity (uCi/atm cc) K = counting efficiency (cpm/uCi) P = (Pe2 – Pi2) Pe2 = external bomb pressure (atm) Pi2 = internal pressure of device (atm) Devices to be tested for hermeticity are placed into a specialized test chamber, pressurized with purified dry air and small amounts of the Radioisotope, Kr85 gas. This pressurized, radioisotope tracer condition is specified by the Krypton–85 equation which determines the pressure limit and length of bomb time based on the device’s cavity size and desired reject leak rate. After completion of the pressurization cycle, the devices are removed from the Radiflo pressurization tank, taken to a counting station which utilizes a scintillation crystal to detect extremely small quantities of Kr85. If detected, the count will be registered and based on the customer desired reject leak rate, a pass/fail criteria registered. Supported Test Standards T = Bomb time (hours) t = 3600 (sec/hr.) Test Method Test Conditions MIL-STD-750 1071 A, B, G1 & G2 MIL-STD-883 1014 B1, B2 & B2/B1 Combination August 7, 2015 • Revision 1.0 7725 N. Blossom Trail • Orlando, FL 32810 • &407.298.7100 • [email protected] Micross USOrange (Americas) 407.298.7100 • Micross UK (EMEA ROW) +44 (0) 1603 788967 • [email protected]• •www.micross.com www.micross.com Form #: CSI-D-721 Document 001 Fine & Gross Leak Testing via Radiflo® Radioisotope: Krypton–85 (Kr85) Technology Krypton–85 is a radioactive inert gas that emits weak gamma rays and beta particles. The detectability of the gas is millions of times greater than the detection of helium in a mass spectrometer leak test, thus much shorter bomb times, greater accuracy with no negative impact issues due to use of fluorocarbon liquids as part of a Gross leak test. Additionally, test accuracies of extremely small cavities is improved for fine leak detection due to the properties of the tracer gas therefore reducing risk that a fine leak device has escaped due to loss of helium contained within the ultra-small cavity prior to detection. Micross Services We are currently providing our Radiflo® process on many of the standard hermetic semiconductor packaging footprints. Current available lead times are for either a standard one-week turn, or for our customer’s convenience, three-day expedited services. We also offers our Radiflo® process on many additional standard package footprints; please contact your sales professional for a lead time quotation. For other packaging footprints including high I/O leaded devices and non-standard footprints please consult the factory. Hermetic Packages 3 4 6 8 10 12 14 16 18 20 22 24 28 32 36 40 44 48 52 56 64 68 84 100+ Ceramic DIP (300 MIL) Ceramic DIP (400 MIL) Ceramic DIP (600 MIL) Ceramic Flact Pack (FP) Ceramic LCC (CLCC) Ceramic PGA (Pin Grid Array) * Ceramic Quad Flat Pack (CQFP) * Ceramic J Quad Flat Pack (CJQFP) * * Hybrid Packages TO Metal Packaging TO3 TO5 * * TO18 * * TO39 * * TO72 * * TO99 * * TO100 * * TO257 * * TO258 * * * * * * TO259 Metal Can Metal Tab Metal Z-Tab Standard one-week turnaround as well as expedite service available Consult factory for current lead times * Consult factory August 7, 2015 • Revision 1.0 Micross US (Americas) 407.298.7100 • Micross UK (EMEA & ROW) +44 (0) 1603 788967 • [email protected] • www.micross.com Form #: CSI-D-721 Document 001