Quality Control

Definitions of types & Levels for electronic components testing & verification   

Level-I Authenticity Inspection & Verification (AIV)

      1. Purpose

Level-I Authenticity Inspection & Verification is a relatively low cost consuming and time-saving test method, which is most applicable for EMS manufacturer and the reseller market. It is a test method used to verify the electronic components conditions through the way of chemical corrosion, physical microscope magnifying observation, simple pin consistency checking etc, to check the intactness of the devices, the surface marking consistency whether the devices are burnished and remarked, the lead/pin integrity and co-planarity etc, which determines whether the devices are consistent with the original manufacturer and requirements of end-user.

      2. Test Items:

A.      Incoming parts backgrounds, external packing (in PVC tubes, trays, paper boxes, anti-static bags, tape & reel, plastic bags with humidity indication cards, vacuum /non vacuum sealed bags, desiccant pouches etc ) inspection, date code, lot number confirmation & relevant records in compliance with OEM’s validity.

B.      External visual inspection, devices surface conditions, OEM specified materials, labeling, marking & logo verification & inspection.

C.      ESD compliance (charge additionally)

D.     Testing & inspection of intactness of pins / leads, balls, moment of force, moment of torque, oxidation degree, solderability ( JESD22-B102D ,if necessary &charge additionally) etc.

100% physical / visual inspection for:

Lead Integrity (JESD22-B105C)

Co-planarity (JESD22-B108A)

Dimensions (JESD22-B100B)

Visual (JESD22-B101) 

E.      Verification & inspection of the die layout conditions with multiple electron microscope after de-capsulation to identify whether the parts are Counterfeits or not. [Counterfeit products may be able to achieve the original standards (so is called feasible alternatives), or may not be in compliance.]----Chemical De-capsulation is used to confirm original OEM die/chip/wafer (note1)

F.      Micro circuits photos capturing & analysis with microscope to identify whether the surface markings are in accordance with the markings on the die layout. (especially applicable to those parts surface marked with another part number, having similar functions, but actually are burnished & remarked from low-grade parts to simulate high-grade ones. )

G.     Real Time X-Radiography to verify integrity of internal hardware (note 2) as far as the die layout.

H.      Test of some simple electrical parameters.


1. It is a destructive test which has to open the device and inspect the inside chip under high magnification electron microscope, its a perfect way to determine whether the parts are counterfeits or OEMs, the minimum size we can test is as low as 65nm.  (Limited to the minimal amount of samples for a lot only).

2. Real time X-radiography to samples are used to verify integrity of internal hardware (chips), the bonding wire, and the excess air bubbles which immerge into interlayer between dies and  packaging materials.


Level -II  Direct Current Characteristics Test (DCCT)


Level-II Direct Current Characteristics Test, also known as static parameters measuring test, is a test method performed to measure voltage and current to the records of the DC characteristics to the device parameters through a dedicated IC testing machine (IC tester). A comparative analysis of device performance parameters with original datasheet will be conducted to show the differences. Voltage and current is measured during the DC test and the pass/fail results are based on the measured & compared values.


       Test Items:


A.  Chemical de-capsulation of one random piece of the samples.(default but charge additionally)

B. The testing whether the internal connections are open /short. (The probable affecting factors are various such as environment humidity, corrosion of internal connections / bonding point, some micro metal wire grounded short circuit or bridged some two pins during chips’ packaging process, and the open loop of the pins protecting diodes etc. )

C. The testing whether the input load current limit (IIL /IIH) is in compliance with standard protocols.

D. The testing whether the output threshold voltage (VOH / VOL) is in compliance with standard protocols.

E. The testing whether quiescent current (IDD) is in compliance with OEM requirements & datasheet.


      Measure the following DC Characteristic Parameters

Direct Current Electronics Parameters


Open/Short for each pin


High level input current


      Low level input current



   Input Clamp (VI)




Resistive Inputs Pull-ups and Pull-downs


        High level output voltage


Low level output voltage


High level output current


     Output short circuit current


      High Impedance Currents


Output short circuit current


      IDD Gross/Dynamic Current


Operation current


Low level supply current drain


High level supply current drain


Breakdown voltage


Output Fan out


For some complex devices, there are no test vector (pattern) provided by OEM. According to the relevant specification,
application notes, datasheet & end-users’ application circuit, IC testing lab will firstly have to assess & design a
feasible dedicated testing circuit which imposes appropriate and effective incentives (source signals) to the input pins
through the external circuits & ports. Then through the regulatory control of peripheral circuits,
signal amplification & conversion matching etc, testing lab uses universal measuring instruments / equipments such as
the arbitrary signal generator connected to the input pins, while connected to the output pins monitoring the output
wave forms with oscilloscope, logic analyzer and spectrum analyzer etc to detect whether the device has defects /errors .
The key functional test is a very effective method for those complex devices. Sometimes, it can be executed on the ATE.

Test Items:
1. Chemical de-capsulation of one random piece of the samples.(default but charge additionally)
2. Verify whether the key functions of the device are consistent with the original OEM’s
3. Verify whether the functions can meet the end-user’s requirements. (For the device might meet the original criteria,
but not necessarily in line with customer’s needs)
4. Verify whether the device was used or not. (Check whether it has been burned with program or data inside for
MCU / Memory/ FPGA)

LEVEL-IV Full Functions and Characteristics Test (FFCT)

Level IV, FFCT, is an IC testing method performed in accordance with simulation test vectors provided by OEM or written
by the testing lab themselves(a relatively more difficult process), which uses IC testing machine (tester) to test
and verify device’s DC parameters, all functional characteristics & performance status, except the testing & verification
of AC parameters & characteristics. In other words, FFCT completely covers the test items of Level II &Level III.
Test Items:
A. The testing items of Level-II & Level-III
B. Part of testing items can not be achieved by Level-III
C. Part of electrical limit parameters testing & verification. (E.g. maximum & minimum of VDD, Data writing rate etc.)
Functional Testing
The device actively performs logical functions. Input data is supplied to the DUT and output data is compared with the
expected result. Functional testing must attempt to screen out devices which contain marginal defects that could at some
future time result in a device failure.

Functional testing verifies that the DUT will correctly perform its intended logical functions. To accomplish this,
test vectors or truth tables must be created which can detect faults within the DUT. The test vectors, combined with
the test timing, make up the heart of the functional test.

All aspects of the DUTs performance must be considered when developing the functional test. The exact values of
the following items must be carefully examined.

VDD Min/Max — DUT power levels
VIL/VIH — input levels
VOL/VOH — output levels
IOL/IOH — output current loading
VREF — IOL/IOH switching point
Test Frequency — cycle time used for test
Input signal timings — clocks / setups / holds / controls
Input signal formats — wave shapes of input signals
Output timings — when will outputs be sampled within cycle
Vector sequencing — start / stop points within a vector file

It can be seen from the above list that the majority of the test system’s resources must be used during a functional test.
All functional tests consist of two distinct components,
the test vector file and the instructions contained within the main test program.
The test vector file represents the input and output logic states needed to test the DUT.
The test program contains the information needed to control the test hardware in a manner that will create all the necessary voltages, wave forms and timings.

Functional Specifications
Gross Functional Tests
Test Conditions, Timings, Vectors
Opens and Shorts - Functional Method
VIL/VIH Input Levels Testing
VOL/IOL VOH/IOH Functional Test
Resistive Output Loading
Input/Output Levels Relationship
Functional Z State / High Impedance Testing

Open Drain / Open Source Outputs
Equation Based Timing
The Test Cycle
Input Data and Input Signal Formats
Input Signal Timings
Output Data and Testing Outputs
Testing Valid (L/H) Output Levels
Output Testing using an Edge Strobe or a Window Strobe
Testing High Impedance (Z-state) Output Levels
Output Current Loading
Output Strobe Timing
Output Loading for AC Tests
Vector Data

LEVEL-V Alternating Current Characteristics Test (ACCT)
After the successful completion of level IV testing, of which the parameters of the testing items are in compliance
with corresponding criteria & standards, it’s necessary to carry out the Level V ACCT test to further verify the
device signals transmission parameters & characteristics, edge characteristics etc (e.g: set-up time, hold-on time,
also the use of tools such as ShmoPlote to analyze the curves characteristics when a variable changes with the change
of another variable). ACCT completely covers the testing scope & items of Level IV FFCT, and can solve all the problems
FFCT can do & can no do.
AC testing guarantees the device can perform its logical functions with regards to time. There are input timing parameters,
output timing parameters and overall operational parameters.
ACCT Testing items including:
A. The testing items of Level IV
B. In addition to regular testing items, adopt the analysis way of Sudden second approximation to certain parameters
(e.g. linearity mode / binary mode) to identify the signal parameters limits while it changes with other variables,
try to analyze the device performance characteristics while it works at different states.
C. The logical & timing relations between input signals & input signals, input signals & output signals.
D. The logical & timing relation between system clock & I/O signals.
E. The signal changing state at the moment of power-up /power-down.

AC Parameters Testing
Standard AC Parameters
Read & Record and Go–No go Testing
Rise Time / Fall Time
Setup Time / Hold Time
Propagation Delay Measurements
Minimum Pulse Widths
Maximum Frequency
Output Enable and Disable Time
Device Characteristics Analysis
Characterization Parameters
Common/Defining Characterization Parameters
The Linear/ Binar Search
Binary Search – Input/Output Timings
Threshold/Level Search
Shmoo Plots

LEVEL-VI Special Environment Analysis & Test (SEAT)
General description:
Under the premise that all the device parameters of each testing items in Level V ACCT are qualified and in compliance
with corresponding criteria & standards, it’s necessary to further
Perform the DCCT, KFT, and ACCT under special environment such as low & high temperature test, high humidity test &
vibration test etc to meet special requirements.

Testing Items Including:
1. The testing items of LEVEL-V
2. Testing of electrical performance &working conditions under special environment.
Additional Test Items and Levels:
LEVEL-EXI ROHS Criteria (Lead-free) Test and Analysis (LFTA)
There’re two branch methods that test whether the device is consistent with ROHS Criteria.
EXI –A Standard ROHS Testing Bar
A special chemical bar can check whether the device is consistent with ROHS
criteria, it is the simplest and fastest way, but not a guarantee
EXI-B Chemical Material Analysis Method
A chemical process is performed to detect, analyze and measure the content & ratio of various components material
in the device
LEVEL-EXII Solder ability Test and Analysis (SDTA)
A chemical method is performed to analyze the ratio of various components material in the device
EXII-A Observe using Microscope
EXII-B Testing of special Measurement & Analysis Instrument for SDTA
EXII-C Observe using other assistant instruments Such as X-Ray , Micro section Analysis, SEM, etc.

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