Emulation Socket

  1. Theory
  2. Field replacable socket
  3. Successful emulation project

Theory

Testing bumped chip on Particle Interconnect leadframe

Field replacable socket

Alternative Particle Interconnect lead frame with holddown

Removable single unit - proof of concept.

0.025" pitch, 196 lead, ceramic QFP. 0.020" pitch, 256 lead, ceramic QFP.

Field replacable socket vs. nonfield replacable packages

Field replacable socket diagram.

Field replacable socket

Conceptual drawing

Field replacable socket contact resistance

Contact resistance vs current capacity

0.020" pitch connection. Accuracy:

Forcing current
Amps
Sense voltage
milli-volts
Resistance
(R = V / I)
milli-ohms
0.0001 too small to read -
0.0010 too small to read -
0.0100 0.0113 1.13
0.1000 0.1243 1.24
0.2000 0.2480 1.24
0.3000 0.3751 1.25
0.4000 0.5011 1.25
0.5000 0.6351 1.27
0.6000 0.7660 1.27
0.7000 0.9042 1.29
0.8000 1.0240 1.28
0.9000 1.1631 1.29
1.0000 1.2796 1.28
1.5000 1.8978 1.26
2.0000 2.5438 1.27

Particle Interconnect Package (PIP)

Advanced low-cost minimal IC package.

QFP 132 lead, 0.012" pitch OLB (Outer Lead Bond). Leadframe / Chip-On-Board socket & carrier.
  • 0.001"-0.005" flex/rigid board with flip chip attached topside (heat up/electrical down) {3 μ line & space on 3 μ flex obtainable at special labs}
  • Board acts as probe card/burn-in socket/final package, only bad die are thrown away at assembly.
  • Leads completely supported yet flexible and damage resistant.
  • Outer Lead Bond (OLB) attachment by conventional heated solder reflow method or non-heated Particle Interconnect methods.
  • Automatic or manual placement even with finest pitches.
  • Controlled impedance routing from OLB to die pad in either single or multi-layer PCB.
  • Lower cost than etched/stamped leadframes or conventional flip chip techniques.

Successful emulation project

BGA package soldered to BGA socket and pinned on the outside edge for CTI (Connector Technology Inc.) in 1992.

Particle Interconnect through-hole BGA socket

0.050" pitch, 15x15 version.