Terminal Blocks - Headers, Plugs and Sockets

Part Number	Description / PDF	Quantity
284514-9 TE Connectivity AMP Connectors	TERM BLOCK HDR 9POS VERT 3.5MM	359
1-1986693-0 TE Connectivity AMP Connectors	TERM BLOCK PLUG 10POS STR 3.5MM	204
284511-8 TE Connectivity AMP Connectors	TERM BLOCK PLUG 8POS STR 3.81MM	40
1776131-5 TE Connectivity AMP Connectors	TERM BLOCK HDR 5POS VERT 3.81MM	0
284513-8 TE Connectivity AMP Connectors	TERM BLOCK HDR 8POS 90DEG 3.81MM	1660
1-1986720-0 TE Connectivity AMP Connectors	TERM BLOCK PLUG 10POS STR 3.81MM	0
1986722-7 TE Connectivity AMP Connectors	TERM BLOCK PLUG 7POS STR 3.81MM	0
1-796634-0 TE Connectivity AMP Connectors	TERM BLOCK PLUG 10POS STR 5.08MM	98
2213936-3 TE Connectivity AMP Connectors	SMT TB SCREW RECEPTACLE, 3.5MM,	0
796858-2 TE Connectivity AMP Connectors	TERM BLOCK PLUG 2POS STR 5MM	157
1986375-6 TE Connectivity AMP Connectors	TERM BLOCK PLUG 6POS 3.81MM	0
1546931-4 TE Connectivity AMP Connectors	TERM BLOCK HDR 4POS VERT 5MM	173
2-2342078-0 TE Connectivity AMP Connectors	TERM BLOCK HDR 20POS VERT 3.81MM	199
2351886-3 TE Connectivity AMP Connectors	3POS TB HDR 180 DEG PITCH 3.5 TL	2366
282815-7 TE Connectivity AMP Connectors	TERM BLOCK HDR 7POS 90DEG 5.08MM	0
2213934-3 TE Connectivity AMP Connectors	SMT TB PERP PLUG, 5.0MM, 3 POS	932
1776263-3 TE Connectivity AMP Connectors	TERM BLOCK PLUG 3POS 90DEG 5MM	921
284047-8 TE Connectivity AMP Connectors	TERM BLOCK PLUG 8POS 5.08MM	0
1-1546931-2 TE Connectivity AMP Connectors	TERM BLOCK HDR 12POS VERT 5MM	10
282830-3 TE Connectivity AMP Connectors	TERM BLOCK PLUG 3POS 90DEG 5MM	18

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