:orphan:

.. _glossary_PLASTIC:

Plastic(PDIP) Packaging
-----------------------


**PDIP**, which stands for **Plastic Dual In-line Package**, is a common type of integrated circuit (IC) packaging characterized by a rectangular body made of molded plastic and two parallel rows of pins (leads). It's a type of through-hole package, meaning the pins are designed to be inserted through holes on a printed circuit board (PCB) and soldered on the other side. PDIP is one of the most widely used and cost-effective packaging solutions for a vast range of electronic components.



Key Features and Construction

PDIP packaging has several defining features that have made it popular for decades:

.. csv-table:: 
   :widths: 30,70

   "**Materials**","The main body of the package is made from an opaque molded plastic, typically an epoxy resin. This plastic encapsulates and protects the delicate silicon chip (die) and the internal wire bonds. The pins, or leads, are usually a metal alloy plated with tin, silver, or gold for excellent conductivity and corrosion resistance."
   "**Through-Hole Mounting**","The dual-in-line pin configuration is specifically for through-hole technology. This method provides a strong mechanical connection to the PCB, making it resistant to physical stress and vibration. It's also easy for manual soldering and is often used in prototyping and hobbyist projects."
   "**Simple Design**","The design is straightforward, with a clear pin-numbering scheme. A small notch or dot on one end of the package indicates the location of pin 1, with the remaining pins numbered counterclockwise. This simplicity makes it easy to work with for both manufacturers and electronics enthusiasts."
   "**Cost-Effective**","Compared to its ceramic counterpart, CERDIP (Ceramic Dual In-line Package), PDIP is significantly cheaper to manufacture. This low cost has made it a staple in consumer electronics and commercial applications where high-reliability, hermetic sealing isn't a strict requirement."
   "**Standardized Sizes**","PDIPs come in standard body widths, most commonly 300 mils (0.3 inches) and 600 mils (0.6 inches), and a variety of pin counts, from as few as 8 to as many as 64."


**Manufacturing Process**

The manufacturing process for a PDIP is an example of efficient mass production. It typically involves:

.. csv-table:: 
   :widths: 30,70

   "**Lead Frame Preparation**","A thin metal frame, known as the lead frame, is stamped or etched into the shape of the pins and the central pad where the die will be placed."
   "**Die Attach**","The silicon chip is attached to the central pad of the lead frame using a conductive adhesive or epoxy."
   "**Wire Bonding**","Hair-thin gold or aluminum wires are used to create electrical connections between the bonding pads on the chip and the leads of the lead frame."
   "**Molding**","The assembly is placed into a mold, and hot, liquid plastic is injected at high pressure, completely encapsulating the chip and the wire bonds while leaving the pins exposed. This is the step that forms the recognizable black plastic body."
   "**Trim and Form**","After the plastic hardens, the excess lead frame material is trimmed, and the pins are bent into the final dual in-line shape, ready for use."

**PDIP vs. CERDIP**

While both PDIP and CERDIP share the same dual in-line pin configuration, their material and sealing method create a fundamental difference:


.. csv-table:: 
   :widths: 30,70

   "**PDIP (Plastic)**","The plastic package is not hermetically sealed. It's considered 'moisture-resistant' rather than 'moisture-proof'. Over time, moisture can permeate the plastic, potentially leading to corrosion of the internal components. This makes it unsuitable for mission-critical or high-temperature/high-humidity applications."
   "**CERDIP (Ceramic)**","The ceramic package is hermetically sealed using a glass or metal seal, making it completely impervious to moisture and other environmental contaminants. This superior protection comes at a much higher cost, but it's essential for military, aerospace, and medical applications where extreme reliability is required."