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5

ART28XXT SERIES

Radiation Performance

The radiation tolerance characteristics inherent in the

ART28XXT converter are the direct result of a carefully

planned ground-up design program with specific radiation

design goals. After identification of the general circuit

topology, a primary task of the design effort was selection

of appropriate elements from the list of devices for which

extensive radiation effects data was available. By imposing

sufficiently large margins on those electrical parameters

subject to the degrading effects of radiation, designers

were able to select appropriate elements for incorporation

into the circuit. Known radiation data was utilized for input

to PSPICE and RadSPICE in the generation of circuit

performance verification analyses. Thus, electrical

performance capability under all environmental conditions

including radiation was well understood before first

application of power to the inputs.

A principal design goal was a converter topology that,

because of large design margins, had radiation performance

essentially independent of normal elemental lot radiation

Completion of first article fabrication, screening and

standard environmental testing was followed by radiation

testing to confirm design goals. All design goals were met

handily and in most cases exceeded by large margin.

These test samples were built with elements that, with the

foregoing exceptions, were not screened for radiation

characteristics. Additional radiation tests on subsequent

ART28XXT manufacturing lots provide continued

confirmation of the soundness of the design goals as well

as justification for the element selection criteria.

The following table specifies guaranteed minimum radiation

exposure levels tolerated while maintaining specification

limits.

performance variations. In the few instances where such

margins were not assured, element lots were selected

from which die were fabricated (and characterized) as

radiation hard devices so that realization of the design

goals could be assured.

Inspection

Application

Quantity

Group A

Part of Screening on Each Unit

100%

Group B

Each Inspection Lot

5 units

Group C

First Inspection Lot or

Following Class 1 Change

10 Units

Group D

In Line (Part of Element Evaluation)

Standard Periodic Inspections on ART28XXT Series

As prescribed by MIL-PRF-38534 for Option 2

Radiation Performance Characteristics

International Rectifier currently does not have a DLA Land and Maritime certified Radiation Hardness

Assurance Program.

Test Inspection

Method

Min

Typ

Unit

MIL-PRF-883, Method 1019

Total Ionizing Dose (Gamma)

Operating bias applied during exposure,

200

300

Krads(Si)

Dose Rate (Gamma Dot)

MIL-STD-883, Method 1023

Temporary Saturation

Operating bias applied during exposure,

1E8

Rads(Si)/sec

Survival

4E10

1E11

Neutron Fluence

MIL-STD-883, Method 1017

8E12

1E13

Neutrons/cm

2

Heavy Ions (LET)

Single Event Effects

Operating bias applied during exposure,

SEU, SEL, SEGR, SEB

83

2

/mg

Test lab: Brookhaven National Laboratory,

Tandem Van de Graaff Generator