PN Junction Diode Unit Manufacturer,Supplier and Exporter in India

Product Code : SCL-EAE-11267

The PN Junction Diode Unit provides a structured platform for investigating the behaviour of a semiconductor diode under controlled bias conditions. In forward bias, the P-side is connected toward the positive supply and the N-side toward the negative supply. Current then increases as the applied forward voltage rises.

In reverse bias, the supply polarity is reversed and only a comparatively small reverse current normally flows before breakdown. Students can use suitable meters and a regulated power source to record readings and plot the diode characteristic curve. The installed diode, measuring ranges, panel material and circuit arrangement must be confirmed for the supplied model.

Key Features

Demonstrates diode behaviour: Helps learners compare conduction under forward bias with current blocking under reverse bias.

Supports V-I curve plotting: Allows voltage and current readings to be recorded for graphical analysis.

Explains PN junction operation: Introduces the P-region, N-region, depletion region and junction barrier.

Teaches diode polarity: Helps students identify the anode and cathode before connecting the circuit.

Supports knee-voltage observation: Enables practical study of the region where forward current begins increasing rapidly.

Accessible laboratory connections: Provides connection points for suitable power supplies and measuring instruments.

Suitable for repeated instruction: Supports teacher demonstrations and supervised student practical sessions.

Technical Specifications

Applications and Uses

Plotting the forward-bias V-I characteristic of a diode

Plotting the reverse-bias V-I characteristic of a diode

Identifying diode anode and cathode terminals

Observing forward conduction and reverse leakage current

Estimating knee or cut-in voltage from measured data

Comparing forward and reverse resistance

Introducing diode rectification and one-way conduction

Supporting semiconductor physics and basic electronics practicals

How to Use the PN Junction Diode Unit

Place the unit on a stable, dry and non-conductive laboratory bench.

Identify the diode anode and cathode from the panel markings or circuit diagram.

Connect the unit for forward bias according to the approved laboratory circuit.

Set the supply or voltage control to zero before switching on the circuit.

Increase the voltage gradually and record the corresponding forward-current readings.

Switch off the supply and reconnect the diode for the reverse-bias experiment.

Increase the reverse voltage only within the confirmed operating range and record the reverse current.

Plot voltage on the horizontal axis and current on the vertical axis to obtain the V-I characteristics.

Safety note: Always use current limiting and begin with the supply set to zero. Do not exceed the diode’s confirmed forward-current, reverse-voltage or power-dissipation rating, and never change connections while the circuit is energised.

Care and Maintenance

Disconnect the unit from all power sources after each experiment.

Keep the panel, terminals and connecting leads clean and dry.

Inspect sockets and leads for loose contacts or damaged insulation.

Store the unit in a dry, dust-free cabinet and protect it from static discharge.

Why Choose Lab Exports?

Lab Exports manufactures, supplies and exports scientific laboratory instruments, educational experiment setups and STEM teaching equipment for institutional requirements. The PN Junction Diode Unit fits within the company’s electrical and electronics laboratory equipment range.

Buyers can also review the wider physics laboratory equipment collection and the complete laboratory equipment range . Diode type, electrical ranges, included meters, accessories and export packing should be confirmed against the final quotation.

Frequently Asked Questions

What is a PN Junction Diode Unit used for?

It is used to measure and plot the forward- and reverse-bias V-I characteristics of a semiconductor diode and to study its conduction behaviour.

What happens when a PN junction diode is forward biased?

Forward bias reduces the junction barrier and allows substantial current to flow once the applied voltage reaches the diode’s operating region.

What happens when the diode is reverse biased?

Reverse bias increases the junction barrier. Only a small leakage current normally flows until the diode reaches its reverse-breakdown region.

Can students plot a diode characteristic curve with this unit?

Yes. Students can record voltage and current readings under forward and reverse bias and plot current against voltage, subject to the unit’s confirmed measuring ranges.

Does the unit include built-in meters and a power supply?

The supplied configuration has not been verified. Confirm whether the unit includes meters, voltage controls, power supply and connecting leads before ordering.

Is the PN Junction Diode Unit suitable for schools?

Yes. It is suitable for supervised senior-secondary, college, polytechnic and vocational electronics laboratory experiments.

Request the confirmed diode type, measuring ranges and accessory list through the Lab Exports contact page, or browse the related electrical and electronics laboratory equipment range.