Timing Capacitor: Capacitance Range 1pF to 100μF

Q: What is the difference between a timing capacitor and a regular capacitor?

Timing capacitors are specifically selected for stable capacitance values, low leakage current, and predictable temperature characteristics to ensure accurate timing. Regular capacitors may prioritize other characteristics like high capacitance density or cost efficiency.

Q: How do I calculate the delay time with a timing capacitor?

Delay time (t) = R × C × ln[(V_supply - V_initial)/(V_supply - V_final)]. For standard RC charging from 0V to 63.2% of supply: t = R × C. For full charge (to 99.3%): t = 5 × R × C.

Q: What factors affect timing accuracy with capacitors?

Temperature stability of dielectric material, capacitance tolerance, voltage coefficient, leakage current, and parasitic effects (ESR, ESL) all impact timing accuracy. NP0/C0G ceramics offer the best stability.

Component Specifications

Definition

A timing capacitor is a passive electronic component specifically designed for timing applications in circuits. It stores electrical energy in an electric field and releases it at controlled rates to create precise time delays. In delay circuits, it works in conjunction with resistors to form RC (resistor-capacitor) networks that determine the time constant for signal delays, pulse generation, and oscillation timing.

Working Principle

The timing capacitor operates on the principle of capacitive charge and discharge. When connected in an RC circuit with a resistor, it charges through the resistor at a rate determined by the RC time constant (τ = R×C). The voltage across the capacitor increases exponentially during charging and decreases exponentially during discharging. This controlled charging/discharging cycle creates precise time delays used for timing functions in electronic circuits.

Materials

Dielectric materials: Ceramic (Class 1: NP0/C0G for stability, Class 2: X7R/X5R for higher capacitance), Polyester film (Mylar), Polypropylene film, Tantalum (for compact designs). Electrodes: Silver, Nickel, Copper. Encapsulation: Epoxy resin, Plastic casing.

Technical Parameters

Parameter	Typical range	Notes & selection driver
ESR	Low (typically <0.1Ω)
Tolerance	±1% to ±20%
Voltage Rating	16V to 100V DC
Leakage Current	<0.01CV or 0.5μA (whichever greater)
Capacitance Range	1pF to 100μF
Operating Temperature	-55°C to +125°C
Temperature Coefficient	NP0/C0G: 0±30ppm/°C, X7R: ±15%

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

Standards

IEC 60384, EIA RS-198, MIL-PRF-123, JIS C 5102

Parent Products

This component is used in the following industrial products

Delay Circuit

A timing circuit that introduces a controlled delay in signal propagation, typically used to ensure proper sequencing or stabilization in electronic systems.

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Engineering Analysis

Risks & Mitigation

Capacitance drift with temperature
Dielectric absorption causing timing errors
Voltage coefficient affecting timing at different voltages
Aging effects in some dielectric materials
Parasitic inductance affecting high-frequency timing

FMEA Triads

Trigger: Dielectric breakdown due to overvoltage
Failure: Short circuit, catastrophic failure
Mitigation: Use capacitors with voltage ratings 50-100% above maximum circuit voltage, implement overvoltage protection circuits

Trigger: Temperature-induced capacitance change
Failure: Timing inaccuracies, circuit malfunction
Mitigation: Select temperature-stable dielectrics (NP0/C0G), implement temperature compensation in circuit design

Trigger: Electrolytic drying or dielectric degradation
Failure: Reduced capacitance, increased leakage, timing drift
Mitigation: Use film or ceramic capacitors for critical timing, implement regular calibration, design with redundancy

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Capacitance tolerance typically ±1%, ±5%, ±10%, or ±20% depending on application requirements

Test Method

Capacitance measured at 1kHz, 1Vrms, 25°C using LCR meter; leakage current tested at rated voltage after 1 minute; temperature coefficient tested from -55°C to +125°C

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 Timing Capacitor

Manufacturer profiles associated with Timing Capacitor.

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Frequently Asked Questions

What is the difference between a timing capacitor and a regular capacitor?