Terminal Blocks - Headers, Plugs and Sockets

Image Part Number Description / PDF Quantity Rfq
0395232523

0395232523

Woodhead - Molex

TERM BLOCK PLUG 23POS 270DEG 5MM

0

0395105017

0395105017

Woodhead - Molex

TERM BLOCK PLUG 17POS STR 3.81MM

0

0397080002

0397080002

Woodhead - Molex

TERM BLOCK PLUG 2POS STR 5MM

0

0395016507

0395016507

Woodhead - Molex

TERM BLOCK HDR 7POS VERT 3.5MM

0

0395172520

0395172520

Woodhead - Molex

TERM BLOCK PLUG 20POS 3.81MM

0

0395377420

0395377420

Woodhead - Molex

TERM BLOCK PLUG 20POS 5.08MM

0

0395259004

0395259004

Woodhead - Molex

TERM BLOCK HDR 4POS VERT 5MM

0

0395369018

0395369018

Woodhead - Molex

TERM BLOCK HDR 18POS 5.08MM

0

0395172810

0395172810

Woodhead - Molex

TERM BLOCK PLUG 10POS 3.81MM

0

0395338315

0395338315

Woodhead - Molex

TERM BLOCK PLUG 15POS 5.08MM

0

0395072518

0395072518

Woodhead - Molex

TERM BLOCK PLUG 18POS 3.5MM

0

0395300017

0395300017

Woodhead - Molex

TERM BLOCK PLUG 17POS STR 5.08MM

0

0397150003

0397150003

Woodhead - Molex

TERM BLOCK PLUG 3POS STR 5.08MM

0

0395205517

0395205517

Woodhead - Molex

TERM BLOCK PLUG 17POS STR 5MM

0

0395051019

0395051019

Woodhead - Molex

TERM BLOCK HDR 19POS VERT 3.5MM

0

0395205703

0395205703

Woodhead - Molex

TERM BLOCK PLUG 3POS STR 5MM

0

0395360021

0395360021

Woodhead - Molex

TERM BLOCK HDR 21POS 5.08MM

0

0395238809

0395238809

Woodhead - Molex

TERM BLOCK PLUG 9POS 90DEG 5MM

0

0395373911

0395373911

Woodhead - Molex

TERM BLOCK PLUG 11POS 5.08MM

0

0395032015

0395032015

Woodhead - Molex

TERM BLOCK PLUG 15POS 3.5MM

0

Terminal Blocks - Headers, Plugs and Sockets

1. Overview

Terminal blocks, headers, plugs, and sockets are essential components in electrical and electronic systems for establishing reliable connections between circuits. These devices enable signal transmission, power distribution, and system modularity. Their standardized designs ensure interoperability, scalability, and ease of maintenance in complex systems.

2. Main Types and Functional Classification

Type Functional Characteristics Application Examples
Terminal Blocks Screw/clamp-based connections for high current/ voltage Industrial control panels, power distribution units
PCB Headers Pin/grid arrays for board-to-board connections Embedded systems, Arduino shields
RJ Connectors Modular jacks for data/telecom signals Ethernet networks (RJ45), telephone systems (RJ11)
D-Sub Connectors Multi-pin trapezoidal shells for analog/digital signals Legacy serial interfaces, industrial sensors
USB Connectors Hot-pluggable interfaces for power/data Consumer electronics, peripheral devices

3. Structure and Components

Typical structures include:

  • Insulating housing (PA66, PBT, or LCP plastics)
  • Contact elements (phosphor bronze, beryllium copper)
  • Plating materials (gold, tin, nickel for corrosion resistance)
  • Actuation mechanisms (screws, spring clamps, or friction fits)
  • EMI shielding layers (for high-frequency applications)

4. Key Technical Specifications

Parameter Importance
Current Rating (A) Determines power handling capacity
Voltage Rating (V) Defines dielectric strength requirements
Contact Resistance (m ) Impacts signal integrity and power loss
Insertion Loss (dB) Critical for high-speed data transmission
Mating Cycles Indicates mechanical durability
Operating Temperature (- C to + C) Defines environmental tolerance

5. Application Fields

Primary industries include:

  • Industrial automation (PLCs, HMIs)
  • Telecommunications (5G base stations, routers)
  • Consumer electronics (smartphones, wearables)
  • Medical equipment (imaging devices, patient monitors)
  • Automotive (EV charging systems, ADAS)

6. Leading Manufacturers and Products

Manufacturer Representative Product
Phoenix Contact COMBICON series terminal blocks
TE Connectivity MICRO MATCH connectors
Molex SL Series headers
Amphenol D-Subminiature connectors
Samtec QTE high-speed socket systems

7. Selection Guidelines

Key considerations:

  • Electrical requirements (current/voltage levels)
  • Mechanical constraints (space, vibration)
  • Environmental factors (temperature, humidity)
  • Signal integrity needs (frequency, noise rejection)
  • Cost vs. reliability trade-offs
  • Compliance with standards (IPC, IEC, UL)

8. Industry Trends

Emerging developments include:

  • Miniaturization for wearable devices
  • High-speed connectors for 5G/6G ( 25 Gbps)
  • Hybrid connectors integrating power/data
  • Eco-friendly materials (halogen-free, RoHS compliant)
  • Smart connectors with built-in sensors
  • Automotive-grade connectors for EVs

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