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2 - 10

4N51, 4N52,

67023 4N53, 4N54

HERMETIC, NUMERIC AND HEXIDECIMAL DISPLAYS

TABLE III

GROUP B, CLASS A AND B OF MIL-PRF-87157

Test

MIL-PRF-750

Method

Conditions

Sample Size

Subgroup 1

Resistance to Solvents

1022

4 Devices / 0 Failures

Internal Visual and Mechanical

(10)

2075

1 Device / 0 Failures

Subgroup 2

(1,2)

Solderability

2026

LTPD = 15

Subgroup 3

Thermal Shock (Temp. Cycle)

1051

Condition B1, 15 Min. Dwell

LTPD = 15

Moisture Resistance

(3)

1021

Fine Leak

1071

Condition H

Gross Leak

1071

Condition C

Electrical / Optical Endpoints

(4)

------

Subgroup 4

Operating Life Test (340 hrs.)

(5)

1027

cycling through logic at 1 character

per second.

LTPD = 10

Electrical / Optical Endpoints

(4)

------

Same as Subgroup 3

Subgroup 5

Non-operating (Storage) Life

Test (340 hrs.)

1032

LTPD = 10

Electrical / Optical Endpoints

(4)

------

Same as Subgroup 3

TABLE IV

GROUP C, CLASS A AND B OF MIL-PRF-87157

Test

MIL-PRF-750

Method

Conditions

Sample Size

Subgroup 1

Physical Dimensions

2066

2 Devices / 0 Failures

Subgroup 2

(2, 10)

LTPD = 15

Lead Integrity

2004

Condition B2

Fine Leak

1071

Condition H

Gross Leak

1071

Condition C

Subgroup 3

Shock

2016

1500G, Time = 0.5 ms, 5 blows in

LTPD = 15

Vibration, Variable Frequency

2056

Constant Acceleration

2006

External Visual

(7)

1010 or 1011

Electrical / Optical Endpoints

(4)

------

Subgroup 4

(1,6)

Salt Atmosphere

1041

LTPD = 15

External Visual

(7)

1010 or 1011

Subgroup 5

Bond Strength

(8)

2037

Condition A

LTPD = 20 (c = 0)

Subgroup 6

LTPD = 10

Operating Life Test

(9)

1026

Electrical / Optical Endpoints

(4)

------

Same as Subgroup 3

NOTES: 1. Whenever electrical/optical tests are not required as endpoints, electrical rejects may be used.

2. The LTPD applies to the number of leads inspected, except in no case shall less than 3 displays be used to provide the number of leads required.

3. Initial conditioning should be a 15” bend inward one cycle.

4. Limits and conditions are per the electrical/optical characteristics.

6. Solderability samples shall not be used.

7. Visual requirements shall be as specified in MIL-PRF-883, Methods 1010 or 1011.

8. Displays may be selected prior to seal.

9. If a given inspection lot, undergoing Group B inspection, has been selected to satisfy the Group C inspection requirements, the 340 hour life tests may

be continued on test to 1000 hours in order to satisfy the Group C Life Test requirements. In such cases, either the 340 hour endpoint measurements

shall be made a basis for Group B lot acceptance or the 1000 hour endpoint measurement shall be used as the basis for both Group B and Group C

acceptance.

10. MIL-PRF-883 test method applies.