INDUSTRY COMPONENT

Bootstrap Capacitor

A bootstrap capacitor is a specialized capacitor used in gate driver circuits to provide temporary high-side voltage for MOSFET/IGBT switching.

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Component Specifications

Definition
A bootstrap capacitor is an essential component in half-bridge or full-bridge gate driver circuits, typically connected between the high-side driver supply and the switching node. It stores charge when the low-side switch is on, then provides isolated voltage to power the high-side driver when the high-side switch needs to be activated, enabling efficient switching of power semiconductors without requiring isolated power supplies.
Working Principle
The bootstrap capacitor operates by charging through a diode when the low-side switch is conducting (connecting to ground). When the high-side switch needs to be turned on, the stored charge provides the necessary gate drive voltage relative to the source of the high-side switch, creating a floating power supply that follows the switching node voltage.
Materials
Typically uses ceramic (X7R, X5R) or tantalum dielectric materials with low ESR and high ripple current capability. Electrolytic capacitors may be used in high-capacitance applications.
Technical Parameters
  • ESR <100mΩ
  • Capacitance 0.1μF to 100μF
  • Voltage Rating 16V to 100V
  • Dielectric Type Ceramic (X7R/X5R) or Tantalum
  • Temperature Range -40°C to +125°C
Standards
IEC 60384, MIL-PRF-123, AEC-Q200

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bootstrap Capacitor.

bootstrap capacitor gate driver capacitor high-side driver MOSFET switching IGBT driver power electronics half-bridge circuit Bootstrap Capacitor in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Gate Driver Board

A specialized printed circuit board that controls the switching of power semiconductor devices (typically IGBTs or MOSFETs) in an inverter module.

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Engineering Analysis

Risks & Mitigation
  • Insufficient capacitance causing switching failure
  • Voltage rating exceeded during transients
  • ESR too high causing overheating
  • Dielectric breakdown at high temperatures
FMEA Triads
Trigger: Capacitance degradation over time
Failure: Insufficient gate drive voltage
Mitigation: Use capacitors with stable dielectrics (X7R/X5R) and derate voltage by 50%
Trigger: High ripple current
Failure: Thermal runaway and capacitor failure
Mitigation: Select capacitors with adequate ripple current rating and implement thermal management

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±10% to ±20% typical
Test Method
Capacitance measurement at 1kHz, ESR measurement at 100kHz, leakage current test at rated voltage

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What happens if the bootstrap capacitor value is too small?

If the bootstrap capacitor is too small, it may not store enough charge to properly turn on the high-side switch, leading to incomplete switching, increased switching losses, and potential device failure.

Can electrolytic capacitors be used as bootstrap capacitors?

Electrolytic capacitors can be used in low-frequency applications, but ceramic capacitors are preferred for most applications due to their lower ESR, better high-frequency performance, and longer lifespan.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

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