Ceramic Disc Capacitors

Ceramic disc capacitors are compact, non-polarized capacitors used for high-frequency noise filtering, IC decoupling, and signal conditioning in LED…

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  • Ceramic Disc Capacitor 50V
    Ceramic Disc Capacitor 50V
    SKU: CERAMIC-DISC-CAP-50V-GROUP
    Ceramic disc capacitors, 50V. 18 values: 4.7pF – 6.8nF. Non-polarized — no polarity to observe. Suited for high-frequency filtering.
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    Starting at $0.35

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Ceramic disc capacitors are compact, non-polarized capacitors used for high-frequency noise filtering, IC decoupling, and signal conditioning in LED circuits and general electronics projects. Unlike electrolytic capacitors that provide bulk capacitance for DC smoothing, ceramic disc capacitors excel at shunting high-frequency noise to ground — preventing the erratic IC behavior, LED flicker, and signal interference that plague circuits without proper decoupling. They are the most commonly used capacitor type in hobby electronics and appear in virtually every circuit that contains a microcontroller, 555 timer, voltage regulator, or LED driver IC.

The 0.1µF (100nF) ceramic disc capacitor is the universal decoupling standard. If you are building any circuit with an integrated circuit — an Arduino driving LEDs, a 555 timer generating a flash pattern, an ESP32 controlling addressable LED strips, a voltage regulator providing clean 5V from a 12V supply, or an op-amp in a guitar pedal — you need a 0.1µF ceramic capacitor placed between the IC's power (VCC) and ground (GND) pins, as physically close to the chip as possible. This capacitor acts as a tiny, fast-responding charge reservoir that absorbs the rapid current spikes generated when the IC's internal transistors switch states millions of times per second. Without it, those current spikes propagate through the power traces and cause voltage dips that can reset a microcontroller, make a 555 timer skip beats, cause an LED driver to produce visible brightness glitches, or inject audible buzz into an audio circuit.

Ceramic disc capacitors are non-polarized, meaning they have no positive or negative lead and can be installed in either orientation. This makes them simpler and more forgiving to use than electrolytic capacitors, which must be installed with correct polarity. The through-hole disc form factor fits standard 2.54mm breadboards and perfboard layouts, and the compact size allows them to be tucked close to IC pins even in crowded board layouts. For surface-mount PCB designs where through-hole components are too large, use multi-layer ceramic capacitors (MLCCs) instead — they provide the same decoupling function in a tiny chip package.

Common values and their applications: The 0.1µF (100nF) value is used for IC decoupling on virtually every chip in a circuit. A 0.01µF (10nF) capacitor is used for higher-frequency filtering and appears in EMI suppression circuits, RF bypass applications, and as a secondary decoupling capacitor alongside a 0.1µF on noise-sensitive ICs. 0.001µF (1nF) and smaller values are used in tone-shaping networks (guitar pedal tone stacks, audio equalization circuits), RF filter circuits, and timing applications where very fast RC time constants are needed. 0.22µF and 0.47µF capacitors bridge the gap between ceramic disc and electrolytic territory and are used in timing circuits, low-frequency filtering, and power rail smoothing where space is tight and polarity-independence is desired. Ceramic capacitor values are typically marked with a three-digit code on the body: the first two digits are significant figures and the third is the number of zeros, giving the capacitance in picofarads. So 104 = 10 followed by four zeros = 100,000pF = 100nF = 0.1µF.

555 timer LED circuits are one of the most popular applications for ceramic disc capacitors among LED hobbyists. The classic 555 astable circuit uses two resistors and one timing capacitor to generate a square wave that blinks an LED at a controlled rate. The timing capacitor value, combined with the resistor values, determines the flash frequency and duty cycle. A 0.1µF ceramic capacitor with typical resistor values gives blink rates in the range of a few hertz — visible, attention-getting LED flashing for indicators, alarm panels, and prop effects. Additionally, every 555 timer circuit requires a 0.01µF ceramic capacitor on the control voltage pin (pin 5) to filter noise and stabilize the timer's internal voltage reference. Omitting this capacitor can cause erratic timing, missed pulses, and unpredictable LED behavior.

Noise filtering in LED circuits: Even with a clean DC power supply and proper current-limiting resistors, LEDs can exhibit subtle flickering or brightness instability if the control electronics generate switching noise that couples into the LED drive circuit. Arduino PWM pins, for example, generate high-frequency switching transients that can propagate along wires to other parts of the circuit. Placing a 0.1µF ceramic capacitor between power and ground at the point where the LED circuit connects to the microcontroller output effectively absorbs these transients. For long wire runs (more than about 30cm between the controller and the LEDs), adding a 0.1µF ceramic capacitor at the LED end of the wire is good practice to prevent the wire from acting as an antenna that picks up electromagnetic interference from nearby electronics, motors, or fluorescent lighting ballasts.

Guitar pedal and audio applications: Ceramic disc capacitors are extensively used in guitar pedal circuits for coupling (blocking DC while passing audio signals between amplifier stages), tone filtering (shaping frequency response in tone stacks and feedback networks), and power supply decoupling (keeping digital switching noise from microcontroller-based effects out of the audio signal path). Builders working from PedalPCB, Aion Electronics, and DIY layouts will encounter ceramic capacitors throughout the bill of materials. While some audio purists prefer film capacitors in the signal path for their lower distortion characteristics, ceramic disc capacitors remain the standard for supply bypass and high-frequency filtering in pedal circuits, where their small size and low cost make them practical in tight enclosures. Pair these ceramic capacitors with our resistors for complete circuits, and browse our full electrical components selection for transistors, diodes, and other supporting components.

Frequently Asked Questions

Use a 0.1µF (100nF) ceramic disc capacitor — this is the universal standard for IC decoupling. Place it between the VCC and GND pins of each IC in your circuit (Arduino, 555 timer, voltage regulator, LED driver, op-amp) as physically close to the chip as possible. One capacitor per IC. In critical applications or at high frequencies, you can add a second, smaller capacitor (0.01µF / 10nF) in parallel for additional high-frequency filtering, but the 0.1µF alone is sufficient for the vast majority of LED and hobby electronics projects.
No. Ceramic disc capacitors are non-polarized and can be installed in either orientation. Unlike electrolytic capacitors, which have a positive and negative lead and must be installed correctly, ceramic capacitors work the same regardless of which lead goes to power and which goes to ground. This makes them simpler and more forgiving for beginners to work with.
Ceramic capacitors use a three-digit code printed on the body. The first two digits are the significant figures and the third digit is the number of zeros to add, giving the capacitance in picofarads (pF). For example: 104 = 10 + 0000 = 100,000pF = 100nF = 0.1µF. 103 = 10 + 000 = 10,000pF = 10nF = 0.01µF. 102 = 10 + 00 = 1,000pF = 1nF = 0.001µF. Memorize 104 (0.1µF) and 103 (0.01µF) — those are the two most common values you will encounter in LED and electronics projects.
Not for bridge rectifier smoothing, no. The smoothing capacitor after a bridge rectifier needs high capacitance (100µF or more) to store enough charge to fill in the voltage dips between AC half-cycles. Ceramic disc capacitors max out at a few microfarads — far too little for effective DC smoothing. Use an electrolytic capacitor (100µF, 50V) for smoothing, and use a ceramic capacitor (0.1µF) alongside it for high-frequency decoupling on any ICs in the circuit. The two types complement each other.
A 555 timer LED blinker circuit typically requires two capacitors. First, a 0.01µF (10nF) ceramic capacitor on pin 5 (control voltage) — this is mandatory on every 555 circuit to stabilize the internal voltage reference. Second, a timing capacitor on pins 2/6 that sets the blink rate; this can be ceramic for fast blink rates or electrolytic for slow blinks. A 0.1µF timing capacitor with two resistors (e.g., 10KΩ and 100KΩ) gives a visible blink rate of a few hertz. Adjust resistor and capacitor values to change the speed.
Both use ceramic as the dielectric material, but the form factor and construction differ. Ceramic disc capacitors are through-hole components with wire leads — easy to use on breadboards, perfboards, and hand-soldered PCBs. Multi-layer ceramic capacitors (MLCCs) are surface-mount chip components with no leads — designed for automated PCB assembly and compact board layouts. MLCCs achieve higher capacitance in a smaller footprint by stacking multiple thin ceramic layers internally. For breadboard prototyping and through-hole projects, use ceramic discs. For custom PCB designs, use MLCCs.