Step etched metal electrical contacts
View Patent ↗A step etched metal electrical contact including a main body formed from a metal sheet defining a metal tab sized to match a die/device terminal and an electrical clearance aperture, electrical clearance trench, and/or an electrical clearance gaps. A heat sink may be combined with the step etched metal electrical contact to provide double sided module cooling for increased thermal performance of power modules.
1. A step etched metal contact for a die with a first terminal having a size, comprising:
a main body including a first contact surface, a thickness, and a second surface;
the first contact surface defining a first contact pad matching the size of the first terminal, the first contact surface configured as a wire-bondless connection to connect the first contact surface to the first terminal; and
the first contact surface being defined by an etched clearance aperture extending from the first contact surface into the thickness of the main body.
2. The step etched metal contact of claim 1 , wherein the main body further comprises a second contact surface including a second contact pad, the second contact surface configured as a wire-bondless connection to connect the second contact surface to a second terminal of the die.
3. The step etched metal contact of claim 2 , wherein a size of the second contact pad matches a size of the second terminal.
4. The step etched metal contact of claim 2 , wherein the main body further comprises at least one of the following to isolate the first contact surface and the second contact surface: a trench and a gap.
5. The step etched metal contact of claim 1 , wherein the main body comprises one of the following: Aluminum, Copper, and a low coefficient of thermal expansion (CTE) alloy.
6. A step etched metal contact for a die with a first terminal having a size, comprising:
a main body including a first contact surface, a thickness, and a second surface;
the first contact surface defining a first contact pad matching the size of the first terminal, the first contact surface configured as a wire-bondless connection to connect the first contact surface to the first terminal; and
a clearance gap extending from the first contact surface to the second surface.
7. The step etched metal contact of claim 6 , wherein the main body further comprises a second contact surface including a second contact pad, the second contact surface configured as a wire-bondless connection to connect the second contact surface to a second terminal of the die.
8. The step etched metal contact of claim 7 , wherein a size of the second contact pad matches a size of the second terminal.
9. The step etched metal contact of claim 7 , wherein the main body further comprises at least one of the following to isolate the first contact surface and the second contact surface: a trench and a gap.
10. The step etched metal contact of claim 6 , wherein the main body comprises one of the following: Aluminum, Copper, and a low coefficient of thermal expansion (CTE) alloy.
11. A method of making a step etched metal contact, comprising:
providing a main body including a first contact surface, a thickness, and a second surface;
providing the first contact surface defining a first contact pad matching a size of the first terminal, and configuring the first contact surface as a wire-bondless connection to connect the first contact surface to the first terminal; and
providing the first contact surface with an etched clearance aperture extending from the first contact surface into the thickness of the main body.
12. The method of claim 11 , further comprising providing in the main body a second contact surface including a second contact pad, the second contact surface configured as a wire-bondless connection to connect the second contact surface to a second terminal of the die.
13. The method of claim 12 , wherein a size of the second contact pad matches a size of the second terminal.
14. The method of claim 12 , further comprising providing at least one of the following in the main body to isolate the first contact surface and the second contact surface: a trench and a gap.
15. The method of claim 11 , wherein the main body comprises one of the following: Aluminum, Copper, and a low coefficient of thermal expansion (CTE) alloy.
16. The method of claim 11 , further comprising laminating a dry film on both sides of the main body.
17. The method of claim 11 , further comprising applying a mask to expose aperture regions of the main body.
18. The method of claim 11 , further comprising providing a supporting structure to the main body.
19. The method of claim 11 , further comprising providing a potting compound to the main body.
20. The method of claim 11 , further comprising connecting the first contact surface to the first terminal by one of the following: direct soldering, Thermosonic bonding, and pressure assisted silver sintering.