Bit Line: Width 10-50 nm, Thickness 30-100 nm, Pitch 20-100 nm

Q: What is the difference between bit line and word line?

Bit lines run vertically and carry data signals, while word lines run horizontally and carry addressing signals. Together they form a grid that selects individual memory cells.

Q: Why are bit lines made of copper in modern memory?

Copper has lower resistivity than aluminum, reducing RC delay and power consumption while enabling higher density and faster memory access.

Q: How do bit lines affect memory performance?

Bit line resistance and capacitance directly impact access time, power consumption, and signal integrity. Lower RC values enable faster read/write operations and higher memory bandwidth.

Component Specifications

Definition

In semiconductor memory technology, a bit line is a metallic or polysilicon conductor that runs vertically through a memory array, connecting multiple memory cells along a column. It serves as the primary data transfer pathway for reading stored charge states from memory cells and writing new data values during memory operations. Bit lines work in conjunction with word lines to form the addressing grid that enables random access to individual memory cells in DRAM, SRAM, and flash memory architectures.

Working Principle

Bit lines operate on the principle of charge sensing and voltage transmission. During read operations, the bit line detects minute charge differences from memory cells through sense amplifiers, converting stored charge into readable voltage levels. During write operations, the bit line applies specific voltage levels to program memory cells to desired states. The bit line's low resistance and capacitance characteristics ensure minimal signal degradation and fast access times.

Materials

Copper (Cu) or aluminum (Al) metallization with barrier layers (Ta/TaN), tungsten (W) plugs, and dielectric insulation (SiO2, low-k materials). Advanced nodes may use cobalt (Co) or ruthenium (Ru) for reduced resistance.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pitch	20-100 nm
Width	10-50 nm
Thickness	30-100 nm
Resistance	5-50 Ω/cm
Access Time	<10 ns
Capacitance	10-100 fF
Operating Voltage	0.5-1.2V

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

Standards

JEDEC JESD21-C, SEMI Standards

Parent Products

This component is used in the following industrial products

Memory Array

A structured arrangement of memory cells organized in rows and columns for data storage within secure memory systems.

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Engineering Analysis

Risks & Mitigation

Electromigration
Capacitive coupling
Signal crosstalk
Process variation
Thermal stress

FMEA Triads

Trigger: Electromigration due to high current density
Failure: Open circuit or increased resistance in bit line
Mitigation: Use barrier layers, optimize line dimensions, implement current density rules

Trigger: Capacitive coupling between adjacent bit lines
Failure: Signal interference and read errors
Mitigation: Increase spacing, use shielding, implement error correction codes

Trigger: Process variation in lithography
Failure: Non-uniform bit line dimensions affecting performance
Mitigation: Process control, design for manufacturability, redundancy

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±10% resistance variation, ±5% capacitance variation

Test Method

Four-point probe measurement, capacitance-voltage testing, time-domain reflectometry

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

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Inspection readiness

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Supplier transparency

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Manufacturers of Bit Line

Manufacturer profiles associated with Bit Line.

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Frequently Asked Questions

What is the difference between bit line and word line?