行业组件数据 · 2026

定时电容器

繁體:定時電容器

定时电容器是用于脉冲发生电路中精确时间常数应用的专业无源电子元件。

技术定义与适配语境
典型 定时电容器 会按材料、尺寸公差、适配关系和失效风险在 计算机、电子和光学产品制造 中评估。

定时电容器是专门设计的无源电子元件,用于脉冲发生电路中的精确时间常数应用。它们以受控速率存储和释放电荷,以在电子定时电路、振荡器和脉宽调制系统中建立精确的时间间隔、脉冲持续时间和频率特性。这些电容器具有最小的电容漂移、低介电吸收以及在不同温度下稳定的性能,以保持工业应用中的定时精度。 定时电容器基于基本的RC(电阻-电容)时间常数原理工作。当与定时电路中的电阻串联时,电容器以由RC乘积(τ = R×C)确定的速率充电和放电。这种充放电循环产生精确的时间延迟或脉冲宽度。在脉冲发生电路中,定时电容器与比较器、晶体管或集成电路配合,通过控制电容器极板上的电压建立和衰减来控制开关阈值,从而生成方波、具有特定持续时间的脉冲或频率稳定的振荡。

组件规格

定义
定时电容器是专门设计的无源电子元件,用于脉冲发生电路中的精确时间常数应用。它们以受控速率存储和释放电荷,以在电子定时电路、振荡器和脉宽调制系统中建立精确的时间间隔、脉冲持续时间和频率特性。这些电容器具有最小的电容漂移、低介电吸收以及在不同温度下稳定的性能,以保持工业应用中的定时精度。

定时电容器基于基本的RC(电阻-电容)时间常数原理工作。当与定时电路中的电阻串联时,电容器以由RC乘积(τ = R×C)确定的速率充电和放电。这种充放电循环产生精确的时间延迟或脉冲宽度。在脉冲发生电路中,定时电容器与比较器、晶体管或集成电路配合,通过控制电容器极板上的电压建立和衰减来控制开关阈值,从而生成方波、具有特定持续时间的脉冲或频率稳定的振荡。
工作原理
Timing capacitors operate based on the fundamental RC (resistor-capacitor) time constant principle. When connected in series with a resistor in a timing circuit, the capacitor charges and discharges at a rate determined by the RC product (τ = R×C). This charging/discharging cycle creates precise time delays or pulse widths. In pulse generation circuits, timing capacitors work with comparators, transistors, or integrated circuits to generate square waves, pulses with specific durations, or frequency-stable oscillations by controlling the switching thresholds through controlled voltage buildup and decay across the capacitor plates.
材料
高稳定性介电材料包括NP0/C0G陶瓷(I类)、聚丙烯薄膜、聚苯乙烯薄膜或银云母。电极通常使用银、镍或铜并带有锡/铅或无铅焊料端接。封装材料包括环氧树脂、酚醛涂层或陶瓷封装用于环境保护。
ESR
10mΩ to 100mΩ
Lifetime
>10,000 hours at rated conditions
Tolerance
±1% to ±10%
Voltage Rating
16V to 100V DC
Capacitance Range
1pF to 10μF
Dielectric Absorption
<0.1% to 0.5%
Operating Temperature
-55°C to +125°C
Temperature Coefficient
NP0/C0G: 0±30ppm/°C, X7R: ±15%
标准
IEC 60384MIL-PRF-123EIA RS-198

行业分类与别名

定时电容器 的常用贸易名称、技术标识和检索关键词。

上级产品

该组件会出现在以下整机或工业产品中。

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Dielectric material degradation due to voltage stress or temperature cycling->Capacitance value drift beyond tolerance limits->Use NP0/C0G ceramics or polypropylene films with proven long-term stability; implement derating (operate at ≤50% rated voltage); select capacitors with extended life ratings
Poor solder joint or mechanical stress on terminations->Intermittent connections or open circuit->Follow manufacturer's soldering profiles; use strain relief in mounting; select capacitors with robust termination designs; implement automated optical inspection (AOI)
Moisture ingress in non-hermetic packages->Capacitance shift and reduced insulation resistance->Select conformally coated or epoxy-encapsulated versions; implement proper storage with moisture barrier bags; follow IPC moisture sensitivity level (MSL) requirements

工业生态与工程逻辑

0
Capacitance drift over time
1
Dielectric absorption causing timing errors
2
Temperature coefficient mismatch
3
Voltage coefficient effects
4
Aging characteristics in ceramic types
5
Moisture absorption in film capacitors

合规与检测

tolerance
Capacitance tolerance typically ±1%, ±2%, ±5%, or ±10% depending on application requirements; temperature coefficient tolerance ±30ppm/°C for NP0/C0G
test method
Capacitance measured at 1kHz ±20% with 0.5Vrms ±0.1V; dielectric absorption tested per EIA-198; temperature coefficient verified from -55°C to +125°C; life testing at 85°C with 1.5× rated voltage for 1000 hours

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采购评估维度

不是客户评论,也不是实时热度。以下维度用于前期 RFQ 准备和供应商评估。

技术文档
4/5
制造能力
4/5
可检验性
5/5
供应商透明度
3/5

这些分值是采购评估维度示例,不代表真实客户评分、具体国家买家反馈或实时询盘。

相关组件

常见问题

What is the difference between timing capacitors and regular capacitors?

Timing capacitors are specifically designed for precise time-constant applications with superior stability, lower dielectric absorption, tighter tolerances (±1% to ±5%), and better temperature coefficients compared to general-purpose capacitors. They maintain consistent capacitance values over time and temperature variations, which is critical for accurate timing in pulse generation circuits.

How do temperature variations affect timing capacitor performance?

Temperature changes cause capacitance drift in most capacitors, but timing capacitors use NP0/C0G ceramics or polypropylene films with near-zero temperature coefficients (0±30ppm/°C for NP0). This minimizes timing errors to less than 0.3% across industrial temperature ranges (-40°C to +85°C), ensuring stable pulse widths and frequencies in varying environmental conditions.

Can timing capacitors be used in high-frequency applications?

Yes, timing capacitors with low equivalent series resistance (ESR) and inductance (ESL) are suitable for high-frequency pulse generation up to several MHz. Film capacitors (polypropylene/polystyrene) and NP0 ceramics provide the best high-frequency characteristics with minimal losses, making them ideal for fast rise-time pulses and high-speed timing circuits.

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