GENERATOR - TESTER of the chip UC3843 & similar pinout ICs WITH VISUAL CONTROL + ZENER / TVS/ TL431 reference TESTER + VOLTAGE REGULATOR 4.5-30V PWM-TEST3843

The UC3843 series PWM controller chip is one of the most common when building power supplies. Also, the device is a single-cycle PWM signal generator with adjustable frequency and duty cycle. Very often, the UC3843 series microcircuit can fail due to incorrect device operation or electric shock damage. How to check the health of the UC3843 series microcircuit? Did the pulse-width controller of the UC3843 series damaged? If the chip does not work and does not start, then you can find out with the help of the chip tester of the UC3843 series from the company PWM TEST3843.

The device is a tester of a large number of similar microcircuits with the same pin layout and allows you to detect defective and fake UC3843 microcircuits and the like. Very often, UC3843 series chips from China are defective or simply fake. For such fake chips, a separate unit may not work, or, for example, generation is not stable. There are frequent variants of incorrect labeling of microcircuits, when a microcircuit with a switching voltage of 16 volts UC3842 is marked as a 8.5 volt UC3843 microcircuit. Of course, this chip will not work at low voltage. Tester PWM-TEST3843 allows you to check this issue.

We recommend checking even the new UC3843 series chips for performance. Even the original semiconductor integrated from famous brands can be damaged by static voltage during transportation. The PWM-TEST3843 allows you to check a chip simply, quickly and with visual control. Even without an oscilloscope. If you have an oscilloscope, you can check the quality and operation parameters. But usually visual inspection with LEDs is enough.

Testing SMD versions of UC3843 series chips

The microchip UC3843 and it analogues can be produced in SMD packages: 8-Lead SOIC, 14-Lead SOIC. Adapter for SMD testing is not included in standard KIT, but you can buy SMD adapters separately, if you plan to test chips not only in DIP package. PWM company can offer IC SMD adapters for SOIC8⇒DIP8. 14 pins SOIC PACKAGE adapter is not available & this rare package not supported.

The PWM UC3843 IC Chip Tester is available in two versions:

    1. The DIY version of the device for self-assembling. This version comes in the form of parts and a set of electronic components for assembling the device. It is necessary to solder the electronic components on the printed circuit board, twist and assemble the details of the device.
    2. The READY version of the device assembled by the PWM company and is ready for use  

The device's online documentation & manuals

The PWM company provide two manuals for this testing tool at company's website You can find all information using the model name TEST3843:

  1. DIY instructions guide for assembling the components of the circuit board, for testing and using
  2. DIY assembly Guide of enclosures for PWM-TOOLS testers.


 The main functions of the TEST3843 tool:

    1. IC UC3843 series tester & generator with regulated frequency & duty cycle regulation
    2. On board voltage generator 4.5V-30V  with voltage regulation & voltmeter on board. 4A input current  MAXIMUM.
    3. Tester of zeners 27V max / Tester of TVS diodes/ Tester of adjustable zener IC TL431

Officially supported chips for the testing in DIP8 package

UC3843 UC3842 UC3844 UC2843 UC2842 UC2844 UC1843 UC3845 MIC38C43 ISL6843IB К1033ЕУ15БР. This list can be extended in the future. This testing tool allows to test IC in DIP8 package, but using IC package adapter may test SMD chips as well. SMD adapter not include in standard equipment.

The testing tool provide testing of the main blocks of UC3843 series chips:

    1. PWM output generation block test. Visual LED testing & external oscilloscope test modes.
    2. Reference voltage (aprox. 5V) regulator block test
    3. Frequency regulation test
    4. Duty cycle regulation
    5. Voltage feedback comparator testing

UC3843 series chips output can be tested in two modes:

    1. visual mode with LED blinking in low frequencies mode (SW2 switch should be pressed ON)
    2. oscilloscope mode, using external oscilloscope

Tester of zeners 27V max / Tester of TVS diodes/ Tester of adjustable zener IC TL431

The device can test the reference voltage and display the result of stabilization at the voltmeter on the board. 27V ZENER & TVS MAX can be tested.

Powering of the tester

The AC-DC power adapter is not included. For the powering of the device you can use any DC adapter or any DC power source 10V-20V and with minimum 0.3A output current. The connector type: male DC Power Jack 5.5x2.1mm (DC-005 Jack). Do not exceed 22V input voltage. Power the device from current limited 8A MAXIMUM source & protected from mains for the safety reason.

Device functions 1. IC UC3843 series tester & generator with regulated frequency & duty cycle regulation 2. On board voltage generator 4.5V-30V with voltage regulation & voltmeter on board. 4A input current MAXIMUM. 3. Zener tester / TVS diodes tester/ TL431 tester
PCB design's version 2 or 2.1
Device input voltage 10-20V DC. 0.3A MIN. 4A MAX, 8A PEAK MAX
Device output voltage Regulated voltage 4.5V-30V with potentiometer and voltmeter on the board
Voltage converterter YES, DC-DC SEPIC converter 4.5V-30V. Buck-boost converter
Tested Integrated circuit
Tested chip's description The UC3842 (UC3843) chip is a PWM controller with current and voltage feedback for controlling a key stage on an n-channel MOS transistor, providing its input capacitance with a forced current of up to 0.7A. Chip SMPS controller is a series of chips UC384X (UC3843, UC3844, UC3845) PWM controllers. The UC3842 core is specially designed for long-term operation with a minimum number of external discrete components. The PWM controller UC3842 is characterized by precise control of the operating cycle, temperature compensation and low cost. A feature of UC3842 is the ability to work within 100% of the working cycle (for example, the UC3844 works with a fill factor of up to 50%.). Power supplies made on the UC3843 microcircuit are distinguished by increased reliability and simplicity of execution. Variants of this IC, produced by different manufacturers, may differ in the prefixes, but necessarily contain the core 3842, 3843, 3844. The microcircuit is available in SOIC-8 and SOIC-14 packages, but in most cases it is modified in the DIP-8 package.
Officially supported chips of tester UC3843 UC3842 UC3844 UC2843 UC2842 UC2844 UC1843 UC3845 MIC38C43 ISL6843IB К1033ЕУ15БР
Possible SMD versions of the housing of the microcircuit 8-Lead SOIC, 14-Lead SOIC

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  • 35.00€

  • Ex Tax: 35.00€

  • 2 or more 31.00€
  • 3 or more 27.00€
  • 10 or more 25.00€

Available Options

Supported CHIPS: UC3843, UC3842, UC3844, UC2843, UC2842, UC2844, UC1843, UC3845, MIC38C43, ISL6843IB, К1033ЕУ15БР