Quick Answer:The PN Junction Diode Unit is a silicon junction diode mounted on an insulated base with two 4 mm sockets for anode and cathode and a printed diode symbol showing its polarity, for plotting V-I characteristics in forward and reverse bias.
Last updated: 18 October 2026
Key Features
Silicon junction diode on an insulated base.
Two 4 mm safety-shrouded sockets for anode and cathode.
Silkscreened diode symbol shows the polarity.
Used for forward and reverse bias characteristics.
Technical Specifications
Specification
Value
Diode
Silicon junction diode
Terminals
Two 4 mm safety-shrouded sockets (anode, cathode)
Mounting
High-impact insulated base, schematic overlay
Use
Forward and reverse bias V-I plots
How It Is Used
The unit is connected with a variable DC supply, a voltmeter and a milliammeter. Raising the forward voltage in small steps shows the barrier potential at the knee of the curve, and reversing the connections shows the very small reverse current.