What is the PIND Test?

Are there microscopic particles inside the electronic devices you use that can affect their functioning?

You've probably never asked yourself this question.

Luckily, there are those who do them for you.

Today we talk about the PIND Test, or Particle Impact Noise Detection Test.

What is the PIND Test Used For?

It may seem strange to the layman, but a common cause of electronic device malfunctions —especially in extreme environments—is contamination of circuits by microscopic particles.

These microscopic particles can be of various natures and have different origins: 

• Production residues: These are residues of materials such as adhesives, solvents, resins, lubricants and thermal paste.

• Environmental contamination: Dust, fibers, hair, and other contaminants that entered the device during assembly. 

• Device wear: Device wear can also cause damage that allows solid particles to enter the circuits.

The PIND test is designed to check for the presence of these microscopic particles inside a device being tested.

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How the PIND Test Works

The PIND test is performed by introducing several particles of known size into the electronic device or component and exposing it to physical or electrical vibrations. 

When the particles are hit, they emit sounds that are recorded by a highly sensitive microphone, thus revealing the presence of other foreign particles inside the sample being tested. 

The PIND Test is performed in an isolated and controlled environmentthat is also able to simulate the real conditions of use of the device in question.

Depending on the end uses of these devices, the environment can be a thermo-vacuum chamber, a pressure chamber or even a climatic chamber.

Which sectors are involved in the PIND Test?

More than consumer electronics, the PIND Test concerns two sectors in which electronic components are subjected to strong stress and unconventional environments: the aerospace and military industries.

The main international standards that regulate the PIND Test are in fact MIL-STD-750 Method 2052 and MIL-STD-883, Method 2020, both of military scope.

PIND Test and Climatic Chambers

As we anticipated, the PIND Test must be carried out in isolated environments where it is possible to control certain parameters to simulate the actual environmental conditions of use of the device.

For this reason, climatic chambers play a complementary role in the PIND Test to monitor the behavior of the device at certain temperature and humidity values, which can also reach extreme thresholds.

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The FDM Environmental Chamber for PIND Testing

The FDM Environmental Chamber is the ideal instrument for carrying out climatic tests complementary to the PIND Test as it is designed to reproduce extreme environmental conditions.

In fact, it can reach temperatures between  -70°C and +180°C and up to 98% relative humidity .

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Reference Standards

• MIL-STD-883 Method 2020 — Particle Impact Noise Detection (PIND) Test
• MIL-STD-750 Method 2052 — PIND for semiconductor devices
• ESCC 20200 — Particle impact noise detection test (European Space Components Coordination)
• JEDEC JESD22-B107 — Internal Particle Analysis of Sealed Components
• MIL-PRF-38535 — General Specification for Integrated Circuits (screening requirements)

Authoritative Sources

• MIL-STD-883 Test Method Standard.
• ESCC — European Space Components Coordination.
• JEDEC — Joint Electron Device Engineering Council.

Frequently Asked Questions about PIND Test

What is the PIND test and what does it detect?

PIND (Particle Impact Noise Detection) detects free-floating particles inside sealed hermetic cavities—typically ceramic or metal packages of microcircuits, hermetic relays, and aerospace components. The component is excited with a calibrated vibration (shock + sinusoidal sweep) while a highly sensitive piezoelectric sensor listens for particle-wall impacts. Even a 25 μm particle generates an acoustic peak distinguishable from the background noise.

Why are free particles a problem?

In high-reliability components (satellites, avionics, medical devices), loose conductive particles (bonding metal fragments, processing residues, ceramic flakes) can generate intermittent short circuits . A short circuit in orbit or in flight can lead to the loss of the mission. PIND is non-destructive screening: healthy components pass without damage, while those with detectable particles are rejected. Typical reject rate is 0.1-2% on aerospace lots.

How do you perform a PIND test?

MIL-STD-883 Method 2020 Procedure: (1) pre-test shock of 1500 g for 0.5 ms to dislodge adhering particles; (2) sinusoidal vibration 60-80 Hz at 10-25 g for 3 cycles of 2-3 seconds; (3) listening with piezo sensor coupled to the package; (4) amplification and filtering 150-160 kHz band; (5) automatic detection of peaks above the threshold 50 mV with respect to the noise floor. Single test time: 5-15 seconds per component.

Which components require mandatory PIND?

PIND screening is mandatory for Class S (Space Level) and Class B/Q (military) devices: MIL-PRF-38535 hermetic microcircuits, MIL-PRF-19500 diodes/transistors, MIL-PRF-39016 hermetic relays, and crystal oscillators. It is not required for Class N (commercial) and plastic-encapsulated components. Some critical programs (navigation, missiles) require dual PINDs with 100% pre- and post-burn-in screening to capture particles generated during stress tests.