Expansion Headers: pin_arrangement 2xN dual-row, pitch 2.54mm

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 61076-2, JEDEC MO-220, IPC-2221

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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Expansion Headers

Manufacturer profiles associated with Expansion Headers.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Expansion Headers