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ARH28XXS Series

Radiation Performance

The radiation tolerance characteristics inherent in the

ARH28XXS converters are a result of a carefully planned

ground-up design program with specific radiation design

goals. Identification of the general circuit topology, a

fundamental task in the design effort, was followed by

selection of appropriate elements from a list of devices for

which extensive radiation effects data was available. By

imposing sufficiently large margins on those electrical

parameters showing the worst case degrading effects of

radiation, designers were able to select appropriate

elements for incorporation into the circuit. Existing 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.

The following table specifies guaranteed minimum radia-

tion exposure levels tolerated while maintaining specifica-

tion limits.

A principal design goal was achieving a converter topol-

ogy that, because of large design margins, had radiation

performance essentially independent of radiation induced

element-lot performance variations. Where such margins

cannot be assured, element lots are either selected fol-

lowing RLAT characterization as radiation hard devices

or, purchased as radiation hard devices so that realization

of the design goals are maintained.

.

Test

Conditions

Min

Typ

Max

Unit

Total Ionizing Dose

(2:1 Margin)

MIL-STD-883, Method 1019.4

Operating bias applied during exposure

100

500

Krads

(Si)

Dose Rate

Temporary Saturation

Survival

MIL-STD-883, Method 1021

1E8

1E11

Rads

(Si)/sec

Heavy Ions

(Single event effects)

BNL Dual Van de Graf Generator

83

MeV•

cm²/mg

Radiation Specification T

case

= 25°C

International Rectifier currently does not have a DSCC certified Radiation Hardness Assurance Program.

* Group B quantity for option 2 End of Line QCI. No Group B samples required for Option 1, In-line.

Inspection

Application

Samples

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)

3 units

Standard Quality Conformance Inspections on ARH28XXS Series (Filght Screened)