CTZ3E-10A-W5-PF vs CTZ3E-10A-W5-PR
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| Category | Trimmers, Variable Capacitors | Trimmers, Variable Capacitors |
| Manufacturer | KYOCERA AVX | KYOCERA AVX |
| Description | CAP TRIMMER 2.5-10PF 25V SMD | CAP TRIMMER 2.5-10PF 25V SMD |
| Package | Tape & Reel (TR) | Tape & Reel (TR) |
| Series | CTZ, Kyocera | CTZ, Kyocera |
| Features | Low Profile | Low Profile |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Size / Dimension | 0.177" L x 0.126" W (4.50mm x 3.20mm) | 0.177" L x 0.126" W (4.50mm x 3.20mm) |
| Voltage - Rated | 25 V | 25 V |
| Height - Seated (Max) | 0.071\" (1.80mm) | 0.071\" (1.80mm) |
| Dielectric Material | Ceramic | Ceramic |
| Capacitance Range | 2.5 ~ 10pF | 2.5 ~ 10pF |
| Adjustment Type | Top | Top |
| Q @ Freq | 300 @ 1MHz | 300 @ 1MHz |
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1. What is a variable capacitor or fine-tuning capacitor?
A variable capacitor is a capacitor whose capacitance can be adjusted within a certain range. Its working principle is to change the capacitance of the capacitor by changing the relative effective area or distance between the pole pieces. It is usually used as a tuning capacitor in radio receiving circuits.
Fine-tuning capacitors are actually a type of variable capacitor, but their capacitance variation range is small, usually only a few picofarads to tens of picofarads.
Application scenarios
Variable capacitors are widely used in radio receiving circuits as tuning capacitors, and are also used in various tuning and oscillation circuits, such as the tuning and compensation circuits of radios, televisions and other equipment. -
2. What does a variable capacitor do?
The main function of a variable capacitor is to adjust the capacitance value in a circuit. By changing the relative effective area or distance between the pole pieces, a variable capacitor can continuously adjust its capacitance within a certain range, thereby achieving adjustment and control of circuit parameters.
Application scenarios
Radio receiving circuit: Variable capacitors are often used in radio receiving circuits as tuning capacitors to help adjust the receiving frequency and ensure that the device can receive signals of a specific frequency.
Tuning amplifier and frequency-selective oscillator circuits: They are also widely used in tuning amplifiers and frequency-selective oscillators to help achieve frequency adjustment and signal processing of circuits.
NFC/RFID card readers: In devices such as NFC/RFID card readers, variable capacitors are used for tuning and compensation circuits to ensure the normal operation of the equipment. -
3. What is the difference between fine-tuning capacitors and adjustment capacitors?
There are significant differences between fine-tuning capacitors and adjustable capacitors in terms of definition, structure, and application.
Definition
A fine-tuning capacitor is a capacitor with a very small adjustment range, and can usually only fine-tune the capacitance value in a small range. It is mainly used in circuits that require small adjustments to the capacitance value, such as tuning circuits, filter circuits, etc.
An adjustable capacitor is also a capacitor, but its adjustment range can be much larger than that of a fine-tuning capacitor. The capacitance resistance value can be adjusted by means of knobs, sliding rheostats, photoelectric sensors, etc. Some adjustable capacitors also have a memory effect, which can remember the capacitance value of the last adjustment and restore it to the previous capacitance value when it is used next time.
Structure
A fine-tuning capacitor usually consists of a fixed capacitor and a rotatable capacitor. The rotatable capacitor is fine-tuned by a knob, while the fixed capacitor has an unchangeable capacitance value. In this way, when the knob is fine-tuned, the capacitance value of the rotatable capacitor changes, and the capacitance value of the fixed capacitor remains unchanged.
Adjustable capacitors are generally composed of movable electrodes and fixed electrodes. The movable electrode is usually a rotatable knob or sliding rheostat, which is used to adjust the capacitance value. When the knob or sliding rheostat is adjusted, the movable electrode will move accordingly, thereby changing the capacitance resistance.
Application
Fine-tuning capacitors are mainly used in circuits that require small adjustments to the capacitance value, such as tuning circuits, filter circuits, oscillation circuits, etc. Due to its small adjustment range, it is not competent in circuits that require a large range of capacitance adjustment.
Adjustable capacitors are widely used in various circuits that require a large range of capacitance adjustment, such as tuning circuits, oscillation circuits, filter circuits, radio frequency circuits, etc. In tuning circuits, adjustable capacitors are used to adjust the frequency so that the circuit works in a specific frequency band; in filter circuits, adjustable capacitors are used to adjust the capacitance value, thereby changing the cutoff frequency of the filter.
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4. What is the difference between fixed capacitors and variable capacitors?
The main difference between fixed capacitors and variable capacitors is whether the capacitance value can be changed. The capacitance value of fixed capacitors is fixed, while variable capacitors can change their capacitance value by manual adjustment.
Fixed capacitors
A fixed capacitor is a capacitor with a fixed capacitance value. Its basic structure is two conductive plates that are very close to each other, separated by an insulating medium such as air, paper or ceramic. Fixed capacitors are mainly used in circuits for power filtering, signal filtering, signal coupling, resonance, filtering, compensation, charging and discharging, energy storage and DC isolation. Common types of fixed capacitors include paper capacitors and electrolytic capacitors. Paper capacitors are made by sandwiching paper soaked in paraffin between two layers of lead foil and rolling them into a cylindrical shape; electrolytic capacitors use electrolysis to produce a very thin oxide insulating layer on the aluminum film as a dielectric, which has a large capacitance value, but the two poles have fixed polarity.
Variable capacitors
A variable capacitor is a capacitor whose capacitance can be continuously adjusted within a certain range. It is usually composed of a set of fixed plates and a set of moving plates, and the capacitance value is changed by changing the position of the moving plates. Variable capacitors are mainly used in circuits as tuning capacitors in radio receiving circuits. The capacitance value is changed by manually adjusting the position of the moving plates, thereby achieving circuit adjustment. Variable capacitors include fine-tuning capacitors, whose capacitance value can be slightly adjusted. They are usually made of two pieces or two groups of small metal springs with a dielectric sandwiched between them. When adjusting, the distance or area between the two pieces is changed.
