Test benches

AN3353

4/9

Doc ID 018527 Rev 1

2.2

STMicroelectronics test bench

STMicroelectronics test bench is described in Figure 2. All the dimensions (height,

materials, insulator thickness etc.) and ground connections are in accordance with the

standard (Figure 1).

The ESD gun is mounted on a stand with a slide arm in order to move it up to the device

under test especially during air discharge conditions.

Figure 2.

ESD test bench for STMicroelectronics protection devices

Our device is soldered on a dedicated PCB as shown in Figure 3. A 2 mm female banana

plug is connected to the ground plane of the PCB. This plug, through the bleeder resistors (2

x 470 k

Ω), links the horizontal coupling plane to the PCB ground plane.

A rounded discharge tip is connected to the pin to test. Depending on the device, one or

more tips can exist. These tips are soldered on the bottom side of the PCB such that they

act as a shield for the clamping voltage measurement by means of the SMA plugs added in

the top side of the PCB.

Ground reference plane

Horizontal coupling plane

(1.6 m x 0.8 m)

Insulating support

470 k

Ω

470 k

Ω

Non conducting table

ESD gun power supply

DUT PCB

470 k

Ω

470 k

Ω

DUT GND

Protective conductor

DUT

ESD Generator NSG438 TESEQ

ESD IEC6100-4-2 environment ESS-801 NOISEKEN