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Database for Solder Properties with Emphasis on New Lead-free Solders Release 4.0

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National Institute of Standards & Technology and
Colorado School of Mines

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Properties of Lead-Free Solders (Cont.)

4. Miscellaneous

    A. Major considerations for replacement lead-free solders:

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Table 4.1.a. Designation and Composition of Lead-Free Solders.
(This table is divided into two parts "a" and "b". To see part "b" click here part 4.1.b.)
A.C. = "Alloy Code"; L = liquidus; S = solidus; P.R. = pasty range; CTE = coefficient of thermal expansion. Blank cells indicate either zero composition or no available data.
[Due to space limitations, source is documented at end of this series of tables.]
A. C.


Composition (wt%)

Comments

Melting
Temperature
(ºC)

Density (g/cm3)

 Spec-
ific Heat (J/g)		 CTE
(µm
per m.ºC)
Sn Ag Bi Cu In Sb Zn Pb
L S P. R. Meas. Calc.
A1*

63

           

37

Baseline (eutectic) alloy, properties used as reference.

183

183

0

8.39

8.42

45.

18.74

A2

62

2

          

36

Popular surface- mount alloy

180

179

1

8.44

8.44

47.

25.70

A3

3

             

97 

 

 Low-usage, low-lead content, very-high-temp, C4 alloy used by IBM; very good in thermal fatigue.

318

318

0

11.13

11.21

22.

29.72

A4*

96.5

3.5

            Baseline (eutectic) alloy, properties used as reference.

221

221

0

7.37

7.38

64.

20.04

A5 95        

5

    Popular high-temp. alloy.

241

234

7

7.25

7.27

57.

20.09

A6*

42

 

58

          Baseline (eutectic) alloy, properties used as reference.

138

138

0

8.57

8.57

46.

14.26

A7

95

3.5

     

0.5

Cd: 1.0   Alpha alloy #38, low usage; contains cadmium.

223

221

2

7.39

7.39

64.

20.54

A8

25

           

75

 

264

183

81

9.68

10.00

17.

  
                                 
B1

50

  

50

           Similar to B2, wider pasty range and lower elongation (21%)

152

138

14

8.37

8.37

43.

  
B2

48

  

52

           Compare solderability results with B1, choose one. High Bi content

151

138

13

8.42

8.42

40.

12.13
B3

42

  

55

3

         High Cu, wide pasty range, high liquidus, low elongation >400 -    

8.55

    
B4

48

  

48

4

         High Cu, wide pasty range, high liquidus, low elongation >400 -    

8.39

    
B5

48

2

46

4

         Poor ductility (2.7% elongation)

146

137

9

8.44

8.4

36.

14.38
B6

42

  

56

  

2

       Quenched alloy shows ternary melting (99°C solidus),116% total elongation.

140

126

14

8.52

8.52

45.

16.01
                                 
C1

67.5

2

      

1.5

  

29

 IBM patent alloy, low usage and lead content; not commercially available.

198

183

15

8.1

8.19

52.

20.45
C2

93.

3

  

4

         95 ºC pasty range, liquidus > 300 ºC.

221

221

0

7.42

7.42

61.

14.83
C3

94.

2.5

2

    

1.5

     Similar to E3, same pasty range and YS but lower % elongation.

226

219

7

7.4

7.38

59.

  
C4

93.5

3

1

1

  

1.5

     A complex system, but meets acceptance criteria.

224

220

4

7.34

7.39

65.

19.9
C5

78.4

2

9.8

  

9.8

       32 C pasty range, 7.1% total elongation, high indium
content ($12.8 / lb).

195

163

32

7.48

7.54

46.

11.86
                                 
D1

55.

 

45.

           Similar to B1, 29 ºC (26 ºC) pasty range, lower pasty range

164

138

26

  

8.25

    
D2

41.

  

57.

  

2.

       Similar to B6, lower % elongation (71.8%)

140

127

13

8.55

8.54

44.

15.85
D3

41.

2.

57.

           Meets acceptance criteria but questionable value over A6

147

140

7

8.61

8.60

44.

14.39
D4

41.

  

57.

    

2.

     Similar to D5, lower elongation, wider (sic) pasty range

150

141

9

8.53

8.52

45.

15.8
D5

42.

  

57.

    

1.

     Meets acceptance criteria, high Bi

149

138

11

  

8.53

    
D6

40.5

2.

56.

    

1.5

     Similar to D7, lower % elongation (26.8%)

145

137

8

8.59

8.56

44.

13.15
D7

40.

3.

55.5

    

1.5

     Meets acceptance criteria but questionable value over D5

147

137

10

  

8.58

    
D8

40.

3.

55.

    

2.

     Similar to D7, same % elongation, wider pasty range (12 ºC)

150

138

12

  

8.56

    
D9

39.

3.

54.

  

2.

2.

     99 ºC solidus, wide pasty range (39 ºC)

138

99

39

8.56

8.54

40.

15.25
D10

39.

3.

54.

    

2.

     3.7 % elongation

154

138

16

8.61

8.58

40.

15.24
                                 
E1

95

3

      

2

     Meets acceptance criteria; other alloys more promising

228

225

3

7.35

7.35

62.

13.44
E2

93

3

  

2

  

2

     Meets acceptance criteria; other alloys more promising

224

221

3

7.36

7.38

62.

13.44
E3

93

3

2

    

2

     Meets acceptance criteria; good yield strength and elongation

226

 219

7

7.39

7.39

60.

  
E4

95

3

2

           Meets acceptance criteria; similar to F17, good candidate

220

 216

4

7.39

7.41

59.

14.84
E5

95.5

2.5

2

           Similar to E4; lower % elongation, wider pasty range

221

215

6

  

7.39

    
E6

93.5

  

2

1.5

  

3

     Quaternary alloy; high Cu content

231

225

6

7.34

7.34

57.

16.81
E7

90

  

2

  

8

       Meets acceptance criteria; high In content, lower elongation

215

206

9

7.33

7.34

49.

20.73
E8

80

  

10

  

10

       30-degree pasty range

200

170

30

7.47

7.49

38.

19.68
E9

70

  

10

  

20

       Potentially expensive (high In content) and 3.6% elongation        

7.49

  

15.69
E10

91

           9   High dross; low Fmax

198

198

0

7.26

7.29

69.

31.77
                                 
EN1

86.4

5

   -

8.6

 2     Meets acceptance criteria; midrange melting temperature

205

200

5

7.44

7.41

54.

  
EN2

80

 5.6     14.4       High liquidus, high In; similar to EN1 and F18

199

189

10

7.45

7.43

    
EN3

73.2

 6.8    

20

       Low solidus, very wide pasty range

242

 113

129

7.49

7.46

    
EN4

90.8

 3.1

6.1

   - -     From quench, 78 degree pasty range, 137 ºC solidus

215

 202

13

7.49

7.49

56.

  
EN5

86.5

3.5

10

   - -     Wide pasty range

208

137

71

7.6

7.57

    
EN6

81.7

 3.3

15

           Wide pasty range

200

137

63

7.7

7.67

    
EN7

63.2

 6.8

30

           Very wide pasty range

282

137

145

8.12

8.10

    
EN8

80

 3.3

11.2

  

5.5

       Wide pasty range

221

170

51

7.66

7.59

    
EN9

80.8

 2.5

11.2

  

5.5

       Wide pasty range

200

169

31

7.61

7.57

46.

  

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This page was last updated on: 2002 February 11 8:30:50 pm