INDUSTRY COMPONENT

Row Lines

Row lines are conductive traces in a keypad matrix that connect multiple key switches in a horizontal arrangement to form scanning rows for input detection.

Component Specifications

Definition
Row lines are essential conductive pathways in a keypad matrix circuit that electrically connect the row-side terminals of multiple key switches. They form one dimension of the X-Y scanning grid, enabling the microcontroller to detect key presses by scanning row-column intersections. These lines are typically printed circuit board (PCB) traces or flexible printed circuit (FPC) conductors designed with specific impedance and current-carrying characteristics.
Working Principle
Row lines operate as part of a matrix scanning system where the microcontroller sequentially applies voltage to each row line while monitoring column lines. When a key is pressed, it creates an electrical connection between the activated row line and a column line, allowing the controller to identify the specific key location through row-column intersection coordinates.
Materials
Copper alloy (typically C11000 electrolytic tough pitch copper) with tin-lead or lead-free solder finish, substrate: FR-4 epoxy laminate or polyimide for flexible circuits, protective coating: solder mask or coverlay.
Technical Parameters
  • Thickness 35μm (1oz) standard
  • Resistance <0.5Ω per 100mm
  • Trace Width 0.15-0.3mm
  • Current Rating 100mA maximum
  • Insulation Resistance >100MΩ
  • Dielectric Withstanding Voltage 500V AC
Standards
ISO 9001, IPC-2221, IEC 60194

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Row Lines.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Trace corrosion from moisture
  • Mechanical fatigue from flexing
  • Electrical short circuits
  • Signal crosstalk between adjacent lines
FMEA Triads
Trigger: Poor solder joint at row line connection
Failure: Intermittent or complete loss of multiple keys in same row
Mitigation: Implement automated optical inspection (AOI) and X-ray testing of solder joints
Trigger: Trace corrosion due to environmental exposure
Failure: Increased resistance leading to unreliable key detection
Mitigation: Apply conformal coating and specify appropriate IP rating for enclosure

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.1mm trace width, ±5% resistance value
Test Method
Continuity testing, insulation resistance testing, visual inspection per IPC-A-610

Buyer Feedback

★★★★☆ 4.8 / 5.0 (24 reviews)

"Standard OEM quality for Computer, Electronic and Optical Product Manufacturing applications. The Row Lines arrived with full certification."

"Great transparency on the Row Lines components. Essential for our Computer, Electronic and Optical Product Manufacturing supply chain."

"The Row Lines we sourced perfectly fits our Computer, Electronic and Optical Product Manufacturing production line requirements."

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Frequently Asked Questions

What is the difference between row lines and column lines in a keypad matrix?

Row lines connect key switches horizontally and are actively driven by the microcontroller during scanning, while column lines connect vertically and are monitored for voltage changes. Both work together to form the scanning grid.

Can damaged row lines be repaired?

Minor damage can often be repaired with conductive epoxy or micro-soldering, but extensive damage typically requires PCB replacement to maintain reliable operation.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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