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High Strength and High Conductivity Copper Alloy SuperKFC™

CDA No. 19240 The characteristic of original KFC™ has been brushed up.

SuperKFC™ has small amount of iron and phosphorus in chemical compositions, and is hardened by Fe2P precipitates in copper matrix like original KFC™ . The content of iron and phosphorus is higher than original, and consistent high strength and high electrical conductivity with the concept of process metallurgy. SuperKFC™ has a properties equivalent to C19400 or more, and low content of iron compare with C19400 promising the improvement of yield rate, direct bear wire-bonding and surface condition improvement.
SuperKFC™ is the alloy which has a potential to reduce the cost of your production.

Good Points

  1. Has high electrical and thermal conductivity. Has higher electrical conductivity than C19400.
  2. Has high strength with high electrical conductivity. It can be used for various uses. (Temper ESH)
  3. Has good stamping formability and etching formability.
    It reduce the smut contamination by etching process or pre-plating process.
  4. Has good solderability and platability.
    Can achieve higher Ag-plating reflection required for leadframe of high-luminosity LED.
  5. Has good bare bondability by gold wire and copper wire. Also applicable for direct bear wire-bonding without plating.

Nominal Compositions

Cu-0.3Fe-0.1P (mass%)


Fig. Softening resistance of SuperKFC
Fig. Softening Resistance of

1. Physical Properties

Specific Gravity 8.9
Coefficient of Thermal Expansion
17.5 x 10-6/K
Thermal Conductivity (293K) 311 W/m.K
(Temper H 337W/m.K)
Electrical Resistivity (293K) 22.1 nΩ .m
(Temper H 20.3nΩ .m )
Electrical Conductivity (293K) 78 %IACS
(Temper H 85%IACS)
Modulus Elasticity (293K) 122 GPa

* The above are typical characteristics.

2. Mechanical Properties

Temper Tensile Strength


Vickers Hardness
MHv: 4.9N
H 430~530 3 min 130~160
ESH 500~600 3 min 150~180

* The above tensile strength and hardness are our standard specifications. We will adjust these specifications by your requests.

3. 90°V-type Bend-formability (MBR)

Temper Good
H 0.5 1.0
ESH 1.0 1.5

* The above are typical characteristics.
The value slightly varies depending on the thickness of specimens.


Leadframe for QFP, QFN package, Leadframe for LED, Inner-frame for Heat spreader etc.


Not used cadmium (Cd), lead (Pb), mercury (Hg), six value chrome (Cr+6), polybrominated biphenyl (PBB), Polybrominated biphenyl ether (PBDE) restricted with RoHS etc.


Kobe Steel, Ltd. Advanced Materials Business

Copper Rolled Products Unit

Copper Flat Rolled Products Sales Department