Capillary: Tip Diameter 50-150 μm, Hole Diameter 15-50 μm

Q: What is the typical lifespan of a wire bonding capillary?

Capillary lifespan varies from 500,000 to 2 million bonds depending on material, wire type, and bonding parameters. Ceramic capillaries typically last longer than tungsten carbide for gold wire, while tungsten carbide is preferred for copper wire bonding.

Q: How does capillary geometry affect bonding quality?

Tip diameter controls bond size and deformation. Hole diameter must be 1.2-1.5 times wire diameter for proper guidance. Chamfer diameter affects ball formation consistency. Face angle influences stitch bond quality and tail formation.

Q: What maintenance is required for capillaries?

Regular cleaning with plasma or ultrasonic methods to remove contamination, inspection for tip wear or chipping, and replacement when bond quality degrades or dimensional tolerances exceed specifications.

Component Specifications

Definition

A capillary is a critical consumable component in wire bonding machines used in semiconductor manufacturing. It is a precisely engineered ceramic or tungsten carbide tube with specific tip geometry that guides bonding wire (typically gold, copper, or aluminum) to create interconnections between integrated circuit chips and their packaging substrates. The capillary controls wire looping, applies ultrasonic energy and force during bonding, and ensures consistent ball formation and stitch bonding.

Working Principle

The capillary operates through a combination of mechanical guidance, thermal management, and ultrasonic energy transmission. During ball bonding, the capillary tip positions the wire precisely, applies controlled force and ultrasonic vibration to create metallurgical bonds at both the chip bond pad and substrate lead. The internal bore guides the wire while the tip geometry controls loop shape and bond deformation. Heat is applied through the capillary to facilitate bonding in thermosonic processes.

Materials

High-purity alumina ceramic (Al2O3) or tungsten carbide (WC) with specific grain sizes and density requirements. Ceramic capillaries typically use 99.5%+ alumina with controlled porosity <0.1%. Tungsten carbide variants may include cobalt binder (6-12%). Surface finishes achieve Ra <0.2μm.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Face Angle	90-120°
Tip Diameter	50-150 μm
Hole Diameter	15-50 μm
Chamfer Diameter	75-200 μm
Material Hardness	1500-2000 HV (ceramic), 1400-1800 HV (tungsten carbide)
Wire Compatibility	Gold (15-50 μm), Copper (20-75 μm), Aluminum (25-100 μm)
Operating Temperature	Up to 300°C

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

Standards

ISO 14644-1, SEMI E49, JEDEC JESD22-A108

Parent Products

This component is used in the following industrial products

Wire Bonder

A precision machine used in semiconductor packaging to create electrical connections between integrated circuits and their packages using fine wires.

View Product Details

Wire Bonding Machine

A precision machine that creates electrical interconnections between semiconductor chips and their packages using fine wires.

View Product Details

Engineering Analysis

Risks & Mitigation

Tip clogging from wire debris
Chipping or cracking during handling
Thermal degradation at high temperatures
Inconsistent bonding due to wear
Contamination from improper cleaning

FMEA Triads

Trigger: Accumulation of wire material in capillary hole
Failure: Wire feed obstruction leading to bond misses or wire breaks
Mitigation: Implement regular plasma cleaning cycles and use anti-stick coatings

Trigger: Mechanical impact during machine crashes or mishandling
Failure: Tip chipping causing inconsistent bond shapes and poor electrical connections
Mitigation: Install crash detection systems and use proper handling tools during replacement

Trigger: Thermal cycling during bonding operations
Failure: Material fatigue and micro-cracking reducing capillary lifespan
Mitigation: Optimize bonding temperature profiles and use materials with matched thermal expansion coefficients

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Tip diameter ±2 μm, Hole diameter ±1 μm, Chamfer diameter ±5 μm, Concentricity <3 μm

Test Method

Optical microscopy per SEMI E49, dimensional verification with coordinate measuring machines, bond strength testing per JEDEC JESD22-B116

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

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

Manufacturers of Capillary

Manufacturer profiles associated with Capillary.

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Frequently Asked Questions

What is the typical lifespan of a wire bonding capillary?