Wire Bonds / Solder Bumps: Wire Diameter 15-500μm

Component Specifications

Definition

Wire bonds and solder bumps are critical micro-interconnection technologies used in semiconductor packaging to establish electrical connections between integrated circuit chips and their packaging substrates. Wire bonds utilize fine metallic wires (typically gold, aluminum, or copper) that are thermosonically or ultrasonically bonded between chip pads and substrate leads. Solder bumps (also called flip-chip bumps) are small spheres of solder alloy deposited on chip pads that create connections when the chip is flipped and reflowed onto the substrate. Both technologies enable signal transmission, power distribution, and ground connections in packaged electronic devices.

Working Principle

Wire bonding operates through thermosonic, ultrasonic, or thermocompression processes where a capillary tool forms a ball bond on the chip pad and a wedge bond on the substrate, creating a wire loop. Solder bumping involves depositing solder alloy spheres on chip pads, then using flip-chip technology where the chip is inverted and aligned with substrate pads, followed by reflow soldering that melts the bumps to form metallurgical joints. Both methods rely on controlled heat, pressure, and metallurgical bonding to create reliable electrical interconnects.

Materials

Gold wire (99.99% purity, 15-50μm diameter), Aluminum wire (1% silicon, 25-500μm), Copper wire (oxygen-free, 20-50μm), Solder alloys (SnPb, SnAgCu, SnAg, 50-150μm diameter), Underfill materials (epoxy resins), Bond pad metallization (Al, Cu, Au).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bump Pitch	50-200μm
Resistance	<100mΩ per connection
Bond Strength	>5g force
Wire Diameter	15-500μm
Operating Temperature	-55°C to 150°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, JEDEC JESD22-A104, IPC/JEDEC J-STD-020, MIL-STD-883

Parent Products

This component is used in the following industrial products

Package

In a 3-axis gyroscope, the package is the physical enclosure that protects the delicate MEMS (Micro-Electro-Mechanical Systems) sensor die from environmental factors such as moisture, dust, and mechanical stress.

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Engineering Analysis

Risks & Mitigation

Bond pad contamination
Intermetallic compound formation
Electromigration
Thermal stress cracking
Kirkendall voiding

FMEA Triads

Trigger: Contaminated bond pads
Failure: Poor adhesion and bond lift-off
Mitigation: Implement plasma cleaning, maintain cleanroom protocols, use fresh chemical solutions

Trigger: Excessive thermal cycling
Failure: Thermal stress fractures in solder joints
Mitigation: Optimize underfill material selection, control CTE mismatch, implement proper reflow profiles

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±10μm placement accuracy, ±5% bump height variation

Test Method

Shear testing per JESD22-B117, pull testing per MIL-STD-883 Method 2011, X-ray inspection, CSAM analysis

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 Wire Bonds / Solder Bumps

Manufacturer profiles associated with Wire Bonds / Solder Bumps.

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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 wire bonding and solder bump technology?

Wire bonding creates connections using fine wires in a looping configuration, while solder bumps enable flip-chip connections where the chip is directly attached face-down to the substrate. Wire bonding is more cost-effective for lower I/O counts, while solder bumps provide higher density and better electrical performance for advanced applications.

What are the main failure modes in wire bonds?

Common failures include bond lift-off due to contamination, wire breakage from mechanical stress, intermetallic growth causing brittleness, and corrosion from environmental exposure. Proper cleaning, material selection, and process control are essential for reliability.

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.

Wire Bonds / Solder Bumps