Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
14311114402000 HARTING	HAR-FLEXICON, 11PIN FEMALE, HORI	0
14110513002000 HARTING	TERM BLOCK HDR 5POS 90DEG 2.54MM	580
14120814002000 HARTING	TERM BLOCK HDR 8POS 90DEG 3.5MM	45
14120214005000 HARTING	HAR-FLEXICON, 2PIN MALE, VERTICA	0
14121014001000 HARTING	TERM BLOCK HDR 10POS VERT 3.5MM	99
14310413101000 HARTING	TERM BLOCK PLUG 4POS STR 2.54MM	39
14110313001000 HARTING	TERM BLOCK HDR 3POS VERT 2.54MM	1189
14121017001000 HARTING	TERM BLOCK HDR 10POS VERT 5.08MM	242
14110410002000 HARTING	TERM BLOCK HDR 4POS 90DEG 1.27MM	230
14111013001000 HARTING	TERM BLOCK HDR 10POS VERT 2.54MM	128
14110713001000 HARTING	TERM BLOCK HDR 7POS VERT 2.54MM	505
14310516402000 HARTING	TERM BLOCK PLUG 5POS 90DEG 5MM	0
14111113001000 HARTING	TERM BLOCK HDR 11POS VERT 2.54MM	480
14110413002000 HARTING	TERM BLOCK HDR 4POS 90DEG 2.54MM	826
14310213101000 HARTING	TERM BLOCK PLUG 2POS STR 2.54MM	766
14110513001000 HARTING	TERM BLOCK HDR 5POS VERT 2.54MM	2
14310415402000 HARTING	HAR-FLEXICON, 4PIN FEMALE, HORIZ	0
14310216102000 HARTING	TERM BLOCK PLUG 2POS STR 5MM	0
14110613002000 HARTING	TERM BLOCK HDR 6POS 90DEG 2.54MM	222
14120517001000 HARTING	TERM BLOCK HDR 5POS VERT 5.08MM	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