INDUSTRY COMPONENT

Expansion Headers

Expansion headers are standardized pin connectors that enable modular hardware expansion and peripheral interfacing on single-board computers.

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Component Specifications

Definition
Expansion headers are electromechanical interface components consisting of multiple conductive pins arranged in standardized grid patterns (commonly 2.54mm pitch) that provide electrical connectivity between a single-board computer's main circuitry and external modules, daughterboards, or peripheral devices. They serve as the primary physical and electrical interface for GPIO (General Purpose Input/Output), communication buses (I2C, SPI, UART), power delivery, and specialized function expansion.
Working Principle
Expansion headers operate on the principle of providing standardized, reliable electrical connections through precisely aligned conductive pins and corresponding sockets. When mated with compatible connectors, they establish low-resistance electrical pathways that transmit signals, data, and power between the SBC and expansion modules. The pin arrangement follows specific voltage, current, and signal integrity protocols to ensure proper functionality of attached peripherals.
Materials
Pins: Phosphor bronze or brass with gold/nickel plating (typically 0.64mm diameter). Housing: High-temperature thermoplastic (PBT, PA6T, LCP) with UL94V-0 flame rating. Insulation: FR-4 glass epoxy substrate. Contact resistance: <20mΩ. Current rating: 1-3A per pin. Voltage rating: 50-250V AC/DC.
Technical Parameters
  • pitch 2.54mm
  • pin_count 20-40 pins
  • mating_cycles ≥50 cycles
  • operating_temp -40°C to +105°C
  • voltage_rating 50V DC
  • current_per_pin 1-3A
  • pin_arrangement 2xN dual-row
  • contact_resistance <20mΩ
  • insulation_resistance >1000MΩ
Standards
IEC 61076-2, JEDEC MO-220, IPC-2221

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Expansion Headers.

SBC expansion headers GPIO connectors pin headers hardware interface electronic components Raspberry Pi headers industrial computing Expansion Headers Expansion Headers in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Single Board Computer

A complete computer built on a single circuit board with microprocessor, memory, input/output, and other features.

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Engineering Analysis

Risks & Mitigation
  • Pin bending/damage during mating
  • Cold solder joints
  • Signal crosstalk at high frequencies
  • Electrostatic discharge damage
  • Mechanical stress fractures
FMEA Triads
Trigger: Excessive mating force or misalignment
Failure: Pin deformation or breakage
Mitigation: Implement alignment guides, use insertion tools, specify maximum mating force in assembly procedures
Trigger: Insufficient solder fillets
Failure: Intermittent electrical connections
Mitigation: Follow IPC-A-610 soldering standards, implement automated optical inspection, conduct pull testing
Trigger: Environmental contamination
Failure: Increased contact resistance
Mitigation: Use conformal coating, specify operating environment limits, implement regular maintenance cleaning

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Pin position tolerance: ±0.1mm, Pitch tolerance: ±0.05mm
Test Method
IPC-TM-650 Method 2.6.7 for contact resistance, IEC 60512 for mechanical/electrical testing, MIL-STD-202 for environmental testing

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between male and female expansion headers?

Male headers have exposed pins that insert into corresponding female sockets, while female headers have receptacles that receive male pins. Most SBCs use female headers soldered directly to the board.

Can expansion headers be used for high-power applications?

Standard headers are designed for signal-level and moderate power (1-3A per pin). For high-power applications, dedicated power connectors or reinforced headers with higher current ratings should be used.

How do I prevent pin misalignment during assembly?

Use alignment guides/polarization keys, follow manufacturer's mating force specifications (typically 2-5N per pin), and implement visual/mechanical alignment features during PCB design.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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