Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
691386700003 Würth Elektronik Midcom	TERM BLOCK HDR 3POS VERT 5MM	0
691381000007 Würth Elektronik Midcom	2.50 MM TERMINAL BLOCK PLUG, VER	350
691309510002 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK HEADER, H	0
691313510003 Würth Elektronik Midcom	TERM BLOCK HDR 3POS 90DEG 5.08MM	1055
691363110012 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK PLUG, HOR	74
691382010012 Würth Elektronik Midcom	2.50 MM TERMINAL BLOCK HEADER, H	367
691313510006 Würth Elektronik Midcom	TERM BLOCK HDR 6POS 90DEG 5.08MM	78
691325310012 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	156
691345410005 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK PLUG, HOR	120
691329300006 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, D	300
691351500020 Würth Elektronik Midcom	TERM BLOCK PLUG 20POS 5.08MM	25
691351500021 Würth Elektronik Midcom	TERM BLOCK PLUG 21POS 5.08MM	28
691701340009B Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK HEADER, H	900
691371700006B Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK HEADER, V	99
691345510003 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK PLUG, HOR	215
691363110006 Würth Elektronik Midcom	TERM BLOCK PLUG 6POS 90DEG 3.5MM	131
691373500017B Würth Elektronik Midcom	TERM BLOCK PLUG 17POS STR 5.08MM	0
691318400003 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK HEADER, V	200
691311700107 Würth Elektronik Midcom	TERM BLOCK HDR 7POS VERT 5MM	479
691304330003 Würth Elektronik Midcom	TERM BLOCK PLUG 3POS 180 3.81MM	200

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