Probe head for a microelectronic contactor assembly, the probe head having SMT electronic components thereon

1. A probe head for a microelectronic contactor assembly, the probe head comprising:

a space transformer substrate having a first surface opposite a second surface and a space transforming, electrical interconnect therebetween, the space transforming electrical interconnect including electrical contacts on both the first surface and the second surface of the space transformer substrate;

a probe contactor substrate having a first surface opposite a second surface, the probe contactor substrate having a cavity therein, the probe contactor substrate coupled to the space transformer substrate with the first surface of the probe contactor substrate facing the second surface of the space transformer substrate, the second surface of the probe contactor substrate having a plurality of microelectronic contactors thereon that are electrically connected to the electrical contacts on the second surface of the space transformer substrate; and

a surface mount technology (SMT) electronic component positioned at least partially in the cavity.

2. The probe head of claim 1 , wherein the cavity is a through-hole cavity and the SMT electronic component is mounted on the second surface of the space transformer substrate.

3. The probe head of claim 1 , further comprising a pedestal substrate, wherein the cavity is a through-hole cavity, the SMT electronic component is positioned on the pedestal substrate, and the pedestal substrate is positioned on the second surface of the space transformer substrate.

4. The probe head of claim 3 , further comprising an adhesive between the pedestal substrate and the second surface of the space transformer substrate.

5. The probe head of claim 3 , further comprising an adhesive between the SMT electronic component and the pedestal substrate.

6. The probe head of claim 3 , further comprising an electrical interconnect between a terminal of the SMT electronic component and a conductive element on the second surface of the probe contactor substrate.

7. The probe head of claim 6 , wherein the electrical interconnect comprises a wire bond between the terminal of the SMT electronic component and the conductive element on the second surface of the probe contactor substrate.

8. The probe head of claim 6 , wherein the electrical interconnect comprises a tape automated bonding (TAB) bond between the terminal of the SMT electronic component and the conductive element on the second surface of the probe contactor substrate.

9. The probe head of claim 3 , further comprising:

a bond pad on the pedestal substrate; and

an electrical interconnect between the bond pad and a conductive element on the second surface of the probe contactor substrate;

wherein the SMT electronic component is electrically coupled to the bond pad.

10. The probe head of claim 3 , wherein the pedestal substrate is a ceramic substrate.

11. The probe head of claim 3 , wherein the SMT electronic component is an SMT capacitor, the probe head further comprising:

a first conductive element on the second surface of the space transformer substrate;

an SMT resistor electrically connected to the first conductive element; and

an electrical interconnect between the SMT capacitor and a second conductive element, the second conductive element on the second surface of the probe contactor substrate.

12. The probe head of claim 1 , wherein the cavity is a non-through-hole cavity in the second surface of the probe contactor substrate.

13. The probe head of claim 12 , further comprising a pedestal substrate, wherein the pedestal substrate is positioned in the non-through-hole cavity, and the SMT electronic component is positioned on the pedestal substrate.

14. The probe head of claim 12 , wherein the SMT electronic component is an SMT capacitor, the probe head further comprising:

a first conductive element on the second surface of the space transformer substrate;

an SMT resistor electrically connected to the first conductive element; and

an electrical interconnect between the SMT capacitor and a second conductive element, the second conductive element on the second surface of the probe contactor substrate.

15. The probe head of claim 1 , wherein the cavity is a non-through-hole cavity in the first surface of the probe contactor substrate.

16. The probe head of claim 15 , wherein the SMT electronic component is mounted on the second surface of the space transformer substrate.

17. The probe head of claim 1 , wherein the probe contactor substrate is a ceramic substrate.

18. The probe head of claim 1 , wherein the SMT electronic component is selected from the group consisting of: an SMT resistor and an SMT capacitor.

19. A probe head for a microelectronic contactor assembly, the probe head comprising:

a space transformer substrate having a first surface opposite a second surface and a space transforming electrical interconnect therebetween, the space transforming electrical interconnect including electrical contacts on both the first surface and the second surface of the space transformer substrate;

a probe contactor substrate having a first surface opposite a second surface, the probe contactor substrate coupled to the space transformer substrate with the first surface of the probe contactor substrate facing the second surface of the space transformer substrate, the second surface of the probe contactor substrate having a plurality of microelectronic contactors thereon that are electrically connected to the electrical contacts on the second surface of the space transformer substrate; and

a surface mount technology (SMT) electronic component mounted on the second surface of the space transformer substrate, at a position between the first surface of the probe contactor substrate and the second surface of the space transformer substrate.

20. The probe head of claim 19 , wherein the SMT electronic component is selected from the group consisting of: an SMT resistor and an SMT capacitor.

21. A method of forming a probe head for a microelectronic contactor assembly, the method comprising:

constructing a space transformer substrate having a first surface opposite a second surface and a space transforming electrical interconnect therebetween, the space transforming electrical interconnect including electrical contacts on both the first surface and the second surface of the space transformer substrate;

electrically connecting a number of surface mount technology (SMT) electronic components to ones of the electrical contacts on the second surface of the space transformer substrate;

constructing a probe contactor substrate having a first surface opposite a second surface, the constructing including i) forming a cavity in the probe contactor substrate, and ii) mechanically coupling a plurality of microelectronic contactors to the second surface of the probe contactor substrate; and

after i) electrically connecting the number of SMT electronic components on the second surface of the space transformer substrate, and ii) mechanically coupling the plurality of microelectronic contactors to the second surface of the probe contactor substrate,

coupling the probe contactor substrate to the space transformer substrate with the first surface of the probe contactor substrate facing the second surface of the space transformer substrate; and

electrically connecting the plurality of microelectronic contactors to ones of the electrical contacts on the second surface of the space transformer substrate.

22. The method of claim 21 , wherein electrically connecting a number of SMT electronic components to ones of the electrical contacts on the second surface of the space transformer substrate comprises:

electrically connecting a number of SMT resistors to ones of the electrical contacts on the second surface of the space transformer substrate.

23. The method of claim 21 , further comprising:

positioning at least one of the SMT electronic components at a position that is between the first surface of the probe contactor substrate and the second surface of the space transformer substrate when the probe contactor substrate and the space transformer substrate are coupled.