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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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MIL-STD-690D

APPENDIX A

TABLE A-II. True failure rates for C = 0 (level M).

Probability of qualification

True failure rates at confidence level:

99%

95%

90%

80%

70%

60%

50%

40%

30%

20%

10%

.99

.95

.90

.80

.002

.011

.023

.048

.003

.017

.035

.074

.004

.022

.046

.097

.006

.032

.066

.139

.008

.043

.088

.185

.011

.056

.115

.243

.014

.074

.152

.322

.020

.100

.206

.437

.028

.144

.296

.625

.045

.230

.473

1.000

.095

.486

1.000

2.115

.195

1.000

2.058

4.352

.70

.60

.50

.40

.078

.111

.151

.199

.119

.171

.231

.306

.155

.222

.301

.398

.222

.317

.431

.569

.296

.424

.576

.761

.389

.558

.756

1.000

.515

.737

1.000

1.322

.698

1.000

1.356

1.794

1.000

1.433

1.043

2.570

1.599

2.291

3.107

4.109

3.381

4.844

6.570

8.689

6.959

9.970

13.521

17.881

.30

.20

.10

.05

.01

.262

.350

.501

.651

1.000

.402

.538

.769

1.000

1.537

.523

.699

1.000

1.300

1.997

.748

1.000

1.431

1.860

2.858

1.000

1.337

1.913

2.487

3.821

1.314

1.756

2.513

3.267

5.020

1.737

2.322

3.324

4.320

6.638

2.356

3.150

4.508

5.859

9.003

3.376

4.513

6.458

8.394

12.898

5.398

7.215

10.326

13.422

20.623

11.415

15.259

21.837

28.385

43.615

23.491

31.402

44.939

58.415

89.756

NOTE: For other than M (1.0%) failure rate level, divide above values by 10 for P (0.1%) level, by 100 for R (0.01%)

level, by 1,000 for S (0.001%) level, or by 10,000 for T (0.0001%) level.

TABLE A-III. True failure rates for C = 1 (level M).

Probability of qualification

True failure rates at confidence level:

99%

95%

90%

80%

70%

60%

50%

40%

30%

20%

10%

.99

.95

.90

.80

.022

.054

.081

.125

.031

.075

.112

.174

.038

.091

.137

.212

.050

.119

.178

.275

.061

.146

.218

.338

.073

.176

.263

.407

.088

.212

.317

.491

.108

.258

.386

.599

.135

.324

.485

.751

.180

.431

.646

1.000

.279

.668

1.000

1.549

.418

1.000

1.497

2.319

.70

.60

.50

.40

.166

.209

.254

.306

.231

.290

.354

.426

.282

.354

.431

.520

.367

.460

.561

.676

.450

.564

.688

.829

.542

.681

.830

1.000

.654

.820

1.000

1.205

.797

1.000

1.219

1.469

1.000

1.255

1.529

1.843

1.331

1.670

2.036

2.454

2.062

2.587

3.154

3.802

3.087

3.873

4.721

5.690

.30

.20

.10

.05

.01

.370

.454

.589

.719

1.000

.514

.631

.820

1.000

1.391

.627

.769

1.000

1.219

1.696

.815

1.000

1.300

1.585

2.205

1.000

1.227

1.595

1.945

2.706

1.206

1.480

1.924

2.345

3.263

1.453

1.784

2.318

2.827

3.933

1.772

2.175

2.826

3.446

4.795

2.223

2.728

3.546

4.323

6.015

2.959

3.632

4.720

5.755

8.008

4.584

5.627

7.313

8.916

12.405

6.862

8.422

10.946

13.345

18.567

NOTE: For other than M (1.0%) failure rate level, divide above values by 10 for P (0.1%) level, by 100 for R (0.01%)

level, by 1,000 for S (0.001%) level, or by 10,000 for T (0.0001%) level.