Terminal Blocks - Wire to Board

Part Number	Description / PDF	Quantity
691244500004 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK, VERTICAL	200
691216710004 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, HORIZONT	399
691243210004 Würth Elektronik Midcom	7.00 MM TERMINAL BLOCK, HORIZONT	498
691243210006 Würth Elektronik Midcom	7.00 MM TERMINAL BLOCK, HORIZONT	199
691127700004B Würth Elektronik Midcom	TERM BLK 4POS TOP ENTRY 5MM PCB	0
691136710010 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, HORIZONT	68
691242510009 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK, HORIZONT	90
691216510003S Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK, HORIZONT	0
691243400007 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK, HORIZONT	199
691243400010 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK, HORIZONT	99
691411410011 Würth Elektronik Midcom	TERM BLK 11P SIDE ENT 7.62MM PCB	0
691131710005 Würth Elektronik Midcom	TERM BLK 5POS SIDE ENTRY 5MM PCB	0
691241810004 Würth Elektronik Midcom	TERM BLK 4P SIDE ENTRY 10MM PCB	93
691417420003 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK, 45 ENTR	258
691216800001 Würth Elektronik Midcom	TERM BLOCK 1POS TOP ENTRY PCB	0
691221120004 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK, 55 ENTR	1372
691243400005 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK, HORIZONT	399
691415620003 Würth Elektronik Midcom	10.16 MM TERMINAL BLOCK, 45 ENT	99
691243100010 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK, VERTICAL	389
691256610002 Würth Elektronik Midcom	TERM BLK 2P SIDE ENT 10.16MM PCB	522

Terminal Blocks - Wire to Board

1. Overview

Terminal blocks - wire to board are modular, insulated connectors used to securely join wires to printed circuit boards (PCBs). They provide reliable electrical connections while enabling easy maintenance and reconfiguration. These components play a critical role in bridging wired systems with electronic control units, ensuring signal integrity and power transmission in applications ranging from industrial automation to consumer electronics.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Screw Terminal Blocks	Use screws for mechanical clamping force, offering high reliability and vibration resistance	Industrial control panels, HVAC systems
Spring Clamp Terminal Blocks	Utilize spring pressure for quick wire insertion/removal without tools	Smart home devices, test equipment
IDC (Insulation Displacement Connectors)	Cut through wire insulation for rapid termination, eliminating pre-stripping	Telecom equipment, automotive wiring harnesses
Push-in Terminal Blocks	Accept pre-stripped wires with minimal insertion force	Lighting control systems, factory automation
PCB Terminal Blocks	Through-hole or surface-mount designs optimized for board-level integration	Medical devices, embedded systems

3. Structure and Components

A typical wire-to-board terminal block consists of: - Insulating Housing: Made from high-temperature resistant thermoplastics (e.g., PA66, PBT) for dielectric isolation - Conductive Terminals: Brass or phosphor bronze contacts with plating (Sn, Ag, Au) for corrosion resistance - Clamping Mechanism: Screw, spring, or lever-actuated systems for wire fixation - PCB Interface: Male/female contacts or solder tails for board mounting - Retention Features: Polarization keys and mechanical stops to prevent misalignment

4. Key Technical Specifications

Parameter	Importance	Typical Values
Rated Current	Determines maximum continuous operating current capacity	1-30A
Rated Voltage	Defines safe operating voltage range	50-600V
Contact Resistance	Impacts power loss and thermal performance	10m
Insulation Resistance	Ensures electrical safety and signal integrity	100M
Operating Temperature	Determines material stability in working environment	-40 C to +120 C
Wire Gauge Range	Specifies compatible conductor sizes	26-4AWG
Material Glow-Wire Rating	Measures fire resistance per IEC 60335	650-960 C

5. Application Fields

Key industries include: - Industrial Automation: PLCs, motor drives, CNC machines - Consumer Electronics: Home appliances, audio equipment - Renewable Energy: Solar inverters, wind turbine controllers - Medical Equipment: Diagnostic devices, patient monitors - Automotive: EV charging systems, battery management units

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Phoenix Contact	PTSA 1.5/2-H-PE	Spring clamp, 1.5mm wire capacity, push-in PCB interface
TE Connectivity	CXT PCB Terminal Block	Surface-mount design, 3A rating, halogen-free
Weidm ller	SAM 2.5/ 4-GN	Plug-in connectors, vibration-proof, 2.5mm pitch
Molex	PicoBlade 0.8mm	Ultra-compact IDC terminals for fine wires

7. Selection Recommendations

Key considerations: 1. Electrical Requirements: Match current/voltage ratings with system specifications 2. Mechanical Needs: Choose clamping method based on maintenance frequency 3. Environmental Factors: Select materials for temperature/humidity extremes 4. PCB Compatibility: Verify pitch, height, and footprint specifications 5. Total Cost: Balance upfront cost vs. long-term reliability in mission-critical applications

8. Industry Trends

Emerging trends include: - Miniaturization for IoT and wearable devices - High-density connectors supporting 0.4mm pitch - Smart terminal blocks with integrated diagnostics - Increased adoption of press-fit technology - RoHS-compliant materials with improved tracking resistance - Connectors for high-voltage EV systems (800V+)