Burn-in and Test Socket Contact Data.

Following is data on typical socket contact metals for burn-in and test use.

Contact Metals
PROPERTIES
Units
Phosphor Bronze C51000 Grade A
Beryllium-Copper
C17200 (Alloy 25)
Stainless Steel 302
Beryllium-Nickel Alloy 360 Cu-Ni-Sn
C72900 (Spinodal)

Solder 63Sn37Pb (for reference)

Density

lbs/inE3

0.320
0.302
0.290
0.299
0.323
0.304
Coefficient of Thermal Expansion

10-6 in/in-°F

9.9
9.9
10.4
8.0
9.1
13.3
Electrical Conductivity

% IASC

15
22
3
6
7.8
11.9
Tensile Modulus of Elasticity
10E6 psi
16
19
28.5
29
18.5 2.3
Ultimate Tensile Strength (1)
10E3 psi
58 to 110
152 to 212
85 to 110
215 to 270
130 to 195
4.4 to 6.7
Yield Strength (1)

x10E3 psi

45 to 108
125 to 195
35 to 75
150 to 230
100 to 185
4.0 to 4.4
Elongation (1)
% in 2 inches
4 to 45
3 to 10
4 to 5
8 to 12
2
35 to 53
Rockwell Hardness (1)
C Scale
4
36 to 42
16
49
43
12.2
Endurance Strength
Stress 10E3 psi after 10E6 cycles in reverse bending
30
30 to 48
34
90 to 110
N/A

1.5 to 2.3 (2)

Recommended Temp Usage
°C max
100
175
300
350
225
140

(1).DEPENDS ON HEAT TREATMENT/WORK HARDENING
(2).DEPENDS ON NUMBER OF CYCLES RANGING FROM 2648-4292 AND CROSSHEAD SPEED

Socket Contact Plating

Plating is normally recommended for testing above ambient temperature to prevent oxide growth and thus reduce any contact resistance increase over time. Our standard is 30 micro inches (minimum) gold, applied per MIL-STD-4522058. Porosity is checked by examination under a 10X microscope for pores. Some cost savings may be realized by plating with 100 micro inches of solderable nickel. Solderable nickel offers good protection of the base metal at elevated temperatures and is therefore an option, however, normal shelf-life is five months (without use).

About Us


Loranger International Corporation designs and manufactures burn-in and test sockets, printed circuit boards and environmental chamber systems for the electronics manufacturing industry.

Loranger International Corporation sockets are optimized for today’s small, fine pitch electronic packages including QFN, as well as for older style packages.

Loranger International Corporation burn-in and test sockets are used worldwide in programs including defense, guidance, automotive, music, communication and space exploration.

Contact Us


Loranger International, Inc.
817 Fourth Ave.
Warren, PA 16365
303 Brokaw Road
Santa Clara, CA 95050
Phone
Asia and North America West: (408) 727-4234
Europe and North America East: (814) 723-2250
Email: sales@loranger.com
Sales Representative List: Contact Us