BinKey

28-pin-dip-ic-sockets

5 min read

Important Note

This entire repo was AI created - including all of the data within. The intent was to A) help me with my personal electronics inventory; and B) see how I could use AI to make that process a bit easier. DO NOT TRUST!

28-Pin DIP IC Sockets

Details

  • Location: Cabinet-3, Bin 53, Section A
  • Category: Connectors & Sockets
  • Brand: Generic
  • Part Number: DIP-28
  • Package: 28-Pin DIP Socket
  • Quantity: 10+
  • Status: Available
  • Price Range: $0.50-2.00

Description

These 28-pin dual in-line IC sockets are designed to hold 28-pin DIP (Dual In-line Package) integrated circuits. They provide a removable connection for ICs, allowing for easy replacement, testing, and prototyping without soldering ICs directly to the PCB. The sockets feature standard 0.600” (15.24mm) row spacing and 0.100” (2.54mm) pin pitch, making them compatible with standard 28-pin DIP packages commonly used for microprocessors, memory chips, and large logic ICs.

Specifications

Physical Characteristics

  • Pin Count: 28 pins (14 pins per side)
  • Row Spacing: 0.600” (15.24mm)
  • Pin Pitch: 0.100” (2.54mm)
  • Contact Material: Typically phosphor bronze or beryllium copper
  • Body Material: Usually black plastic (PBT or similar)
  • Mounting: Through-hole PCB mounting

Electrical Characteristics

  • Contact Resistance: Low resistance for reliable connections
  • Voltage Rating: Suitable for standard IC voltages (3.3V, 5V, etc.)
  • Current Rating: Adequate for typical IC current requirements
  • Temperature Range: Standard operating temperature range
  • Insertion/Extraction Cycles: Rated for multiple IC insertions

Key Features

  • Removable IC mounting for easy replacement
  • Standard DIP-28 footprint compatibility
  • Low insertion force for easy IC installation
  • Reliable electrical connections
  • PCB through-hole mounting
  • Compatible with standard 28-pin DIP packages

Pin Layout

    28-Pin DIP Socket
    ┌─────────────────┐
 1  │●                │ 28
 2  │                 │ 27
 3  │                 │ 26
 4  │                 │ 25
 5  │                 │ 24
 6  │                 │ 23
 7  │                 │ 22
 8  │                 │ 21
 9  │                 │ 20
10  │                 │ 19
11  │                 │ 18
12  │                 │ 17
13  │                 │ 16
14  │                 │ 15
    └─────────────────┘

Compatible IC Types

Common 28-pin DIP ICs that fit these sockets:

  • Microprocessors: 8-bit processors like Z80, 6502 variants
  • Memory Chips: EEPROM, EPROM, SRAM (28-pin packages)
  • Microcontrollers: Some PIC and other 28-pin microcontrollers
  • Logic ICs: Large-scale integration logic circuits
  • Interface ICs: Communication and peripheral interface chips
  • Custom ICs: Application-specific integrated circuits

Applications

Common use cases for 28-pin DIP sockets:

  • Prototyping with 28-pin ICs
  • Development boards and evaluation systems
  • IC testing and characterization
  • Retro computing and vintage electronics restoration
  • Educational electronics projects
  • Repair and maintenance of existing equipment
  • Custom embedded system development

Installation Guidelines

PCB Design Considerations

Footprint Requirements:
- Pin spacing: 0.100" (2.54mm)
- Row spacing: 0.600" (15.24mm)
- Hole diameter: 0.038" - 0.042" typical
- Pad diameter: 0.060" - 0.070" typical
- Silkscreen outline recommended for proper orientation

Soldering Instructions

1. Insert socket into PCB with pin 1 indicator aligned
2. Ensure socket sits flush against PCB surface
3. Solder all pins with appropriate temperature (300-350°C)
4. Use flux for clean, reliable solder joints
5. Inspect for cold solder joints or bridges
6. Clean flux residue if required

IC Insertion Best Practices

1. Verify IC orientation (pin 1 alignment)
2. Check IC pin straightness before insertion
3. Insert IC gently with even pressure
4. Ensure all pins are properly seated
5. Avoid excessive force during insertion
6. Use IC extraction tool for removal when needed

Design Considerations

Socket Selection

  • Contact Material: Choose gold-plated contacts for critical applications
  • Profile Height: Consider clearance requirements above PCB
  • Insertion Force: Low insertion force sockets for frequent IC changes
  • Temperature Rating: Match socket rating to application requirements

PCB Layout

  • Orientation Marking: Clear pin 1 indication on silkscreen
  • Clearance: Adequate space around socket for IC insertion/removal
  • Trace Routing: Route traces away from socket area when possible
  • Mechanical Support: Consider socket mounting for high-vibration environments

Reliability Factors

  • Contact Quality: Ensure good electrical contact between IC and socket
  • Mechanical Stress: Avoid excessive bending of IC pins
  • Environmental: Consider humidity and temperature effects
  • Maintenance: Plan for periodic cleaning of socket contacts

Advantages of Using IC Sockets

Development Benefits

  • Easy IC Replacement: Swap ICs without desoldering
  • Prototyping Flexibility: Test different ICs in same circuit
  • Damage Prevention: Protect expensive ICs from soldering heat
  • Debugging Aid: Easy access to IC pins for probing
  • Version Testing: Compare different IC versions easily

Maintenance Benefits

  • Field Replacement: Easy IC replacement in deployed systems
  • Upgrade Path: Simple IC upgrades without PCB changes
  • Failure Analysis: Easy IC removal for testing
  • Inventory Management: Reuse ICs across different projects

Common 28-Pin IC Examples

Microprocessors

  • Z80 CPU: Classic 8-bit processor
  • 6502 variants: Some extended 6502 family processors
  • 8085: Intel 8-bit microprocessor

Memory Devices

  • 28C256: 32KB EEPROM
  • 27C256: 32KB EPROM
  • 62256: 32KB SRAM

Microcontrollers

  • PIC16F877: Popular PIC microcontroller
  • AT89C52: 8051-compatible microcontroller

Tags

ic-socket, dip-socket, 28-pin, through-hole, prototyping cabinet-3 bin-53 status-available

Notes

Having 10+ 28-pin DIP IC sockets provides excellent capability for prototyping and development with larger integrated circuits. These sockets are essential for working with microprocessors, memory chips, and large logic ICs where direct soldering would be impractical or risky. The ability to easily insert and remove ICs makes them invaluable for development, testing, and educational projects. They’re particularly useful for retro computing projects, embedded system development, and any application where IC replacement or testing is required. The standard 0.600” spacing makes them compatible with most 28-pin DIP packages, providing flexibility for various IC types and applications.

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