Packaging in digital electronics In a plastic leaded chip carrier (PLCC) integrated-circuit package used on printed circuit boards, the J-shaped leads are arranged along how many sides of the package body?

Introduction / Context:
Integrated-circuit (IC) packaging directly affects board layout, soldering process, and reliability. The plastic leaded chip carrier (PLCC) is a classic surface-mount package that uses J-leads. Knowing how many sides carry leads helps technicians choose footprints, plan routing, and understand socket compatibility.

Given Data / Assumptions:

• Package type considered: PLCC (plastic leaded chip carrier).
• Lead style: J-lead bent under the package edges.
• Context: printed circuit board (PCB) assembly and footprint selection.

Concept / Approach:
PLCCs are square or nearly square bodies with leads on every edge. Each side carries an equal number of J-shaped leads that curl under the body. This is distinct from SOIC (two opposite rows) or SOT (one side for some variants). Thus, the lead distribution is four-sided.

Step-by-Step Solution:
Identify package: PLCC → J-leads under edges.Check geometry: square body → edges available on four sides.Manufacturing intent: distribute pins around entire periphery for compact routing.Conclusion: leads are present on all four sides.

Verification / Alternative check:
Compare with QFP and LQFP, which also have leads on four sides but use gull-wing leads. PLCC is similar in the “four-sides” aspect, differing only by lead form (J-lead vs gull-wing).

Why Other Options Are Wrong:
One side / two sides / three sides: These correspond to other package families (e.g., SOT/SOIC for two sides), not PLCC.

Common Pitfalls:
Confusing PLCC with SOIC or DIP; SOIC and DIP have leads on two sides only, while PLCC has leads on all four sides.

Final Answer:
four sides