MIL-STD-690-SUP Failure Rate Sampling Plans and ProceduresThis standard provides procedures for failure rate FR qualification, sampling plans for establishing and maintaining FR levels at selected confidence levels, and lot conformance inspection procedures associated with FR testing for the purpose of direct reference in appropriate military electronic parts established reliability ER specifications. Figures and tables throughout this standard are based on exponential distribution. Weibull distribution will be acceptable in certain components such as capacitors. Use of Weibull distribution for any component must be approved by the qualifying activity. This standard also provides guidance to specification writers in the use of this standard see appendix A and references material for users of ER parts.

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Probability of qualification

True failure rates at confidence level:

99%

95%

90%

80%

70%

60%

50%

40%

30%

20%

10%

5%

.99

.95

.90

.80

.161

.227

.269

.327

.197

.277

.329

.400

.221

.312

.370

.450

.257

.362

.429

.522

.287

.405

.480

.584

.318

.447

.531

.645

.350

.492

.584

.710

.386

.544

.645

.784

.431

.607

.720

.875

.492

.694

.823

1.000

.598

.843

1.000

1.215

.710

1.000

1.186

1.442

.70

.60

.50

.40

.373

.416

.460

.506

.457

.510

.563

.620

.514

.573

.633

.697

.596

.665

.734

.809

.667

.745

.822

.905

.737

.823

.908

1.000

.811

.905

1.000

1.101

.896

1.000

1.104

1.216

1.000

1.116

1.233

1.357

1.143

1.276

1.409

1.551

1.389

1.550

1.712

1.885

1.647

1.839

2.031

2.235

.30

.20

.10

.05

.01

.559

.626

.726

.817

1.000

.685

.766

.889

1.000

1.224

.770

.862

1.000

1.125

1.377

.894

1.000

1.160

1.305

1.598

1.000

1.119

1.298

1.460

1.788

1.105

1.236

1.434

1.613

1.975

1.216

1.361

1.579

1.776

2.174

1.343

1.503

1.744

1.961

2.401

1.499

1.677

1.946

2.189

2.680

1.713

1.917

2.224

2.502

3.063

2.082

2.330

2.704

3.041

3.722

2.470

2.763

3.206

3.606

4.415

Probability of qualification

True failure rates at confidence level:

99%

95%

90%

80%

70%

60%

50%

40%

30%

20%

10%

5%

.99

.95

.90

.80

.182

.249

.291

.349

.221

.303

.354

.424

.247

.338

.396

.474

.284

.389

.455

.545

.316

.432

.506

.606

.346

.475

.555

.665

.379

.519

.607

.727

.416

.569

.666

.798

.460

.631

.738

.883

.521

.714

.835

1.000

.624

.855

1.000

1.198

.730

1.000

1.170

1.401

.70

.60

.50

.40

.395

.437

.479

.524

.480

.532

.583

.638

.536

.594

.652

.713

.617

.683

.749

.820

.685

.759

.833

.911

.752

.833

.914

1.000

.823

.912

1.000

1.094

.903

1.000

1.097

1.200

1.000

1.108

1.215

1.329

1.132

1.254

1.375

1.504

1.356

1.502

1.647

1.802

1.586

1.756

1.926

2.107

.30

.20

.10

.05

.01

.576

.640

.736

.822

1.000

.700

.778

.895

1.000

1.217

.782

.869

1.000

1.117

1.359

.900

1.000

1.150

1.285

1.564

1.000

1.111

1.278

1.428

1.737

1.098

1.220

1.403

1.567

1.907

1.201

1.334

1.535

1.715

2.086

1.317

1.464

1.683

1.881

2.289

1.459

1.621

1.864

2.083

2.535

1.651

1.835

2.111

2.358

2.869

1.978

2.198

2.528

2.824

3.436

2.313

2.570

2.956

3.303

4.019