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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Confidence level

Cumulative unit hours

C = Number of failures permitted

Probability of qualification

1/

C = 0

C = 1

C = 2

C = 3

C = 4

C = 5

.99

.95

.90

.80

.70

.60

.50

.40

.30

.20

.10

.05

.01

.01

.05

.10

.20

.30

.40

.50

.60

.70

.80

.90

.95

.99

1,000

5,125

10,547

22,305

35,664

51,094

69,297

91,641

120,391

160,938

230,313

299,375

460,000

14,844

35,547

53,203

82,422

109,727

137,656

167,813

202,266

243,906

299,375

389,063

474,375

660,000

43,750

81,719

110,000

153,516

191,406

228,516

267,422

310,547

361,563

427,969

532,188

629,375

840,625

82,500

136,563

174,531

229,688

276,406

321,094

367,188

417,500

476,250

551,563

668,125

775,625

1,000,000

128,125

197,031

243,281

308,906

363,359

414,766

467,109

523,672

589,063

672,188

799,375

915,625

1,159,375

178,750

261,250

315,156

390,313

451,719

509,063

567,031

629,219

700,625

790,625

927,344

1,050,000

1,309,375

.01

.05

.10

.20

.30

.40

.50

.60

.70

.80

.90

.95

.99

C = 6

C = 7

C = 8

C = 9

C = 10

.99

.95

.90

.80

.70

.60

.50

.40

.30

.20

.10

.05

.01

233,125

328,438

389,531

473,438

541,094

603,906

666,953

734,219

811,133

907,617

1,053,125

1,184,375

1,450,000

290,625

398,125

465,625

557,656

631,250

699,141

766,875

838,965

920,898

1,023,242

1,176,953

1,314,844

1,600,000

351,250

469,375

543,281

642,813

722,031

794,688

866,895

946,359

1,030,078

1,137,891

1,299,609

1,443,750

1,740,625

412,500

542,500

622,188

728,906

813,281

890,430

966,797

1,047,559

1,138,672

1,251,953

1,420,703

1,570,313

1,877,344

477,500

616,875

702,188

815,625

905,078

986,426

1,066,797

1,151,563

1,246,875

1,365,039

1,540,625

1,696,191

2,014,063