Lead frame

C19210/C19400

It is a copper alloy that consists of copper, iron and phosphorus. The luster is close to that of red metal. It has high corrosion resistance and workability. Its conductance is equivalent to that of red metal. It is suitable for components which resist softening and need high conductivity. It is commonly used in the semiconductor industry for semiconductors and electronic lead frames.

Lead Frame: thermal softening resistance, high conductivity with fine workability in punching processes

Chemical Composition

Type No. Alloy No. Symbol Chemical Composition Features & Application
Plate Ribbon Cu Fe P Zn

Lead Frame Material

 C1921

C1921P
C1921R

REM

 0.05~0.15 0.015~0.050 ─

Features: C1921--Excellent soldering, brazing, and coated metal arc welding. High electric conductivity (85% IACS min.) Good workability. Anti-corrosion. Soften tem. 390℃. C1940--Good to excellent corrosion resistance. Excellent hot and cold workability. High strength, high electric conductivity (60% IACS min.), Soften tem. 450℃.
Application: Lead frame, contact springs, Transistor, Diode, etc., BGA heat sink, automobile safety fuse, automobile terminal.
C1940

C1940P
C1940R

REM

 2.1~2.6 0.015~0.150 0.05~0.20

Mechanical Properties & Physical properties

Alloy No. Mechanical Properties  Physical Properties
Quality Grade Symbol
 Tensile Strength
(Kgf/mm2)		 Elongation Hardness Modulus of  elasticity
(GPa)		 Electric Conductivity
(%IACS)		 Specific heat capacity 
﹝J/kg·k﹞		 Density
(g/cm3)		 Coefficient of thermal expansion  (x10-6/K) Thermal conductivity
W/(m·K)
Plate Ribbon Minchali
C1921 O

C1921P-O
C1921R-O

 26~35 ≧30 ＜100 126 ≧85 385 8.94 16.9 —
1/4H

C1921P-1/4H
C1921R-1/4H

 28~38 ≧15 90~120
1/2H

C1921P-1/2H
C1921R-1/2H

 30~43 ≧4 100~130
3/4H

C1921P-3/4H
C1921R-3/4H

 — —
H

C1921P-H
C1921R-H

 34~47 ≧4 110~140
EH

C1921P-EH
C1921R-EH

 ≧38 ≧130
SH

C1921P-SH
C1921R-SH

 48~55 145~165
C1940 O

C1940P-O
C1940R-O

 30~38 ≧15 80~105 121 ≧60 385 8.91 17.9 262
1/4H

C1940P-1/4H
C1940R-1/4H

 31~42 ≧6 95~120
1/2H

C1940P-1/2H
C1940R-1/2H

 37~44 ≧5 115~135
3/4H C1940P-3/4H
C1940R-3/4H		 — —
H

C1940P-H
C1940R-H

 42~49 ≧2 125~145
EH

C1940P-EH
C1940R-EH

 47~51 — 135~150
SH

C1940P-SH
C1940R-SH

 49~53 — 140~155
ESH

C1940P-ESH
C1940R-ESH

 51~56 — 145~170