www.irf.com

5

ARM28XXT Series

Radiation Performance

The radiation tolerance characteristics inherent in the

ARM28XXT converter are based on the results of the

ground-up design effort on the ART2800T program and

started with specific radiation design goals. By imposing

sufficiently large margins on those electrical parameters

subject to the degrading effects of radiation, appropriate

elements were

selected for incorporation into the

ART2800T 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.

The following table specifies guaranteed minimum radiation

exposure levels tolerated while maintaining specification limits.

Radiation Specification T

case

= 25°C

The principal ART2800T design goal was a converter

topology, which because of large design margins, had

radiation performance essentially independent of wafer-lot

radiation performance variations. Radiation tests on

random ART2800T manufacturing lots provide continued

confirmation of the soundness of the design goals as well

as justification for the element selection criteria.

To achieve the radiation levels specified for the ARM28XXT,

the ART2800T topology is utilized as the basis but lot

assurance testing is utilized as part of the screening

process to assure the specified level. Each ARM28XXT

converter is delivered with lot test data at the hybrid level

supporting the minimum TID specification. Other radiation

specifications are assured by design and generic data are

available on request.

Test

Conditions

Min

Unit

Total Ionizing Dose

MIL-STD-883, Method 1019.4

Operating bias applied during exposure

1,000

KRads

(Si)

Dose Rate

Temporary Saturation

Survival

MIL-STD-883, Method 1021

1E8

1E11

Rads

(Si)/sec

Neutron Fluence

MIL-STD-883, Method 1017.2

3E12

Neutron

/cm²

Heavy Ions

(Single event effects)

BNL Tandem Van de Graaff Generator

83

MeV•

cm²/mg

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

Standard Quality Conformance Inspections on ARM28XXT Series (Flight Screened)

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