Terminal Blocks - Wire to Board

Part Number	Description / PDF	Quantity
691412420011 Würth Elektronik Midcom	TERM BLK 11POS 45DEG 7.62MM PCB	0
691412320009 Würth Elektronik Midcom	TERM BLOCK 9POS 45DEG 3.81MM PCB	0
691241610005 Würth Elektronik Midcom	TERM BLK 5P SIDE ENT 10.16MM PCB	0
691412320008M Würth Elektronik Midcom	TERM BLOCK 8POS 45DEG 3.81MM PCB	450
691133710008 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, HORIZONT	200
691131810002 Würth Elektronik Midcom	10.00 MM TERMINAL BLOCK, HORIZON	491
691411910006 Würth Elektronik Midcom	7.50 MM TERMINAL BLOCK, HORIZONT	99
691135810004 Würth Elektronik Midcom	TERM BLK 4P SIDE ENTRY 10MM PCB	0
691256610009 Würth Elektronik Midcom	TERM BLK 9P SIDE ENT 10.16MM PCB	0
691135700008 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, VERTICAL	199
691253800002 Würth Elektronik Midcom	10.00 MM TERMINAL BLOCK, VERTICA	399
691243100006 Würth Elektronik Midcom	3.50 MM TERMINAL BLOCK, VERTICAL	394
691133710010 Würth Elektronik Midcom	5.00 MM TERMINAL BLOCK, HORIZONT	98
691254810002 Würth Elektronik Midcom	10.00 MM TERMINAL BLOCK, HORIZON	173
691243210007 Würth Elektronik Midcom	7.00 MM TERMINAL BLOCK, HORIZONT	199
691214310002 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK, HORIZONT	516
691242500006 Würth Elektronik Midcom	5.08 MM TERMINAL BLOCK, VERTICAL	199
691243310006 Würth Elektronik Midcom	3.81 MM TERMINAL BLOCK, HORIZONT	445
691243410005 Würth Elektronik Midcom	7.62 MM TERMINAL BLOCK, VERTICAL	397
691126710006B Würth Elektronik Midcom	TERM BLK 6POS SIDE ENTRY 5MM PCB	0

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+)