INDUSTRY COMPONENT

Sampling Switch

A sampling switch is an electronic component used in sample and hold circuits to capture and maintain analog voltage signals at precise intervals.

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Component Specifications

Definition
A sampling switch, also known as a sampling gate or track-and-hold switch, is a critical component in sample and hold (S/H) circuits. It functions as an electronic switch that connects the input signal to a holding capacitor during the sampling phase, allowing the capacitor to charge to the input voltage. During the hold phase, the switch disconnects, isolating the capacitor to maintain the sampled voltage for subsequent processing by analog-to-digital converters (ADCs) or other circuitry. This component ensures accurate signal acquisition in data acquisition systems, digital signal processing, and measurement instruments.
Working Principle
The sampling switch operates based on field-effect transistor (FET) or CMOS technology. When a control signal (typically a clock pulse) activates the switch, it closes, allowing the input analog signal to pass through to charge the holding capacitor. When the control signal deactivates, the switch opens, disconnecting the capacitor from the input. The capacitor then retains the voltage until the next sampling cycle. This switching action prevents signal distortion and aliasing by capturing discrete voltage samples at precise time intervals.
Materials
Semiconductor materials (silicon, gallium arsenide), dielectric materials for insulation, metal alloys (copper, aluminum) for contacts and leads, and protective coatings (epoxy, silicone).
Technical Parameters
ParameterTypical rangeNotes & selection driver
Package TypeSOT-23, SOIC, QFN
On Resistance5 Ω to 100 Ω
Voltage Range±5 V to ±15 V
Switching Speed1 ns to 100 ns
Off Leakage Current1 pA to 10 nA
Operating Temperature-40°C to +125°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 9001, IEC 60747, JEDEC JESD22

Parent Products

This component is used in the following industrial products

Sample and Hold Circuit

An electronic circuit that samples an analog signal at a specific instant and holds that value constant for subsequent processing.

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Sample-and-Hold Circuit

An electronic circuit that captures and holds an analog voltage signal at a specific instant in time for subsequent processing.

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Sample-and-Hold Amplifier

An electronic circuit that captures and holds an analog voltage signal at a specific instant in time for subsequent processing.

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Engineering Analysis

Risks & Mitigation
  • Signal distortion from slow switching
  • Voltage droop during hold phase
  • Thermal overload in high-frequency applications
  • Electrostatic discharge (ESD) damage
FMEA Triads
Trigger: High on-resistance due to material degradation
Failure: Inaccurate voltage sampling and signal attenuation
Mitigation: Use low-resistance semiconductor materials and implement regular calibration checks.
Trigger: Dielectric breakdown from overvoltage
Failure: Increased leakage current and loss of held voltage
Mitigation: Incorporate overvoltage protection circuits and adhere to specified voltage limits.
Trigger: Thermal stress from continuous high-speed operation
Failure: Component overheating and permanent damage
Mitigation: Apply heat sinks, ensure adequate ventilation, and monitor operating temperatures.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
±0.1% for voltage accuracy, ±1% for timing intervals
Test Method
IEEE 1241 for analog-to-digital converter testing, including switch performance evaluation via step response and leakage current measurements.

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 Sampling Switch

Manufacturer profiles associated with Sampling Switch.

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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 primary function of a sampling switch?

The primary function is to accurately capture analog voltage signals at specific time intervals and hold them stable for processing by analog-to-digital converters or other electronic systems.

How does switching speed affect performance?

Faster switching speeds enable higher sampling rates, reducing signal distortion and improving the accuracy of high-frequency signal acquisition in applications like oscilloscopes and communication systems.

What are common failure modes of sampling switches?

Common failures include increased on-resistance due to contact wear, leakage current from dielectric breakdown, and thermal damage from excessive power dissipation, leading to signal inaccuracies.

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.

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