The AI passive smd quartz crystal WQC-SMD5032 uses a 4P chip metal package and is widely used in Bluetooth headsets, security equipment, smart home appliances, and other AI electronic products.

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AI passive smd quartz crystal SMD5032 features:
 Excellent heat resistance and environmental characteristics, reducing electromagnetic interference
 High frequency stability, high precision
 Wide frequency output range 8MHz~50MHz
 Reel tape packaging, can be used for automatic installation and reflow soldering
 The product is green and environmentally friendly, and has passed RoHS and Pb Free certification

Precautions for the use of passive smd quartz crystal:
 The design of SMT surface mount crystal resonators is compatible with most automatic mounting processes, but some processes may produce excessive impact, which may damage the crystal inside this product. Therefore, please fully test the installation of this product before mass production.
 If the PCB may be warped, please ensure that the degree of warping does not negatively affect the working characteristics or welding conditions of this product.
 Avoid installation and processing by ultrasonic welding, as this method may propagate excessive vibration inside this product, which may become the cause of characteristic deterioration and non-oscillation.

The resonator (Xtal) is a package of a quartz crystal. This chip is cut from a quartz crystal in a certain way and has undergone a series of vacuum operations such as shaping, polishing, electrode plating, and adjustment. It can oscillate at a specified frequency with a very high Q value. Xtal is a passive component and does not contain an oscillating circuit, but is closely connected to the IC chip containing the driving circuit in terms of circuit distribution.

SMD quartz crystal WQC-SMD3225 is a surface-mount quartz crystal, commonly used in sophisticated electronic products; the volume of SMD quartz crystal is much smaller than that of direct-insertion quartz crystal.

WQC-SMD3225 SMD quartz crystal is a device used in electronic equipment. Below are some common parameters, frequency range, characteristics and possible manufacturer information about WQC-SMD3225 quartz crystal.

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1. WQC-SMD3225 crystal parameters:
 Size: 3.2mm x 2.5mm
 Frequency range: 8.000MHz~54.000MHz
 Operating temperature range: -20C~+70C, -40C~+85C
 Frequency tolerance: +10ppm
 Excitation power: 10uW~100uW
 Load capacitance: 60pF~20pF
 Common frequencies include 8MHz, 16MHz, 25MHz, 40MHz, etc.

2. Features of WQC-SMD3225 crystal:
 Miniaturization: WQC-SMD3225 crystal adopts SMD package, which is small in size and suitable for assembly of high-density circuit boards.
 High stability: WQC-SMD3225 crystal has high stability and can maintain stable frequency output over a wide temperature range.
 High precision: The frequency accuracy of WQC-SMD3225 crystal is high, which is suitable for applications with strict time requirements.
 Low power consumption: WQC-SMD3225 quartz crystal has low power consumption characteristics, which helps to extend the battery life of electronic devices.

3. Application of WQC-SMD3225 quartz crystal
 WQC-SMD3225 quartz crystal is mainly used in smart wearable products, Internet of Things, mobile communications, wireless communications, DVC, radio communications, mobile phones, handheld devices, automotive aftermarket equipment, Bluetooth and other product industries.
 In addition, in the military and aerospace fields, quartz crystals are also used to form an effective communication system, which can be used for navigation purposes of navigation systems and electronic information warfare.

WQC-HC49SMD is popularly said to be an "unreal SMD" quartz crystal. Why do say that? This starts with its production process. WQC-HC49SMD is processed by flattening the feet of WQC-HC49S - putting on gaskets - cutting the feet and pressing them - taping, so except for the pins, the other parameters are the same. Because there are several more production processes than WQC-HC49S, the corresponding cost will also increase, so the price will be slightly more expensive than WQC-HC49S. The commonly used frequencies are 8.000 MHZ, 11.0592MHZ, 12.000MHZ, 13.560MHZ, etc.
https://www.weetcap.com/Crystals-Oscillators/WEET-SMD-Quartz-Crystal-WQC-HC49SMD.html

Volume can also be said to be package size. The frequency range of this WQC-HC49SMD is: 3.200MHz ~48.000MHz, and the size is 12.5x4.5x4.1mm.

The detailed specifications of WQC-HC49SMD are: frequency difference (25℃):10PPM, 20PPM; aging (maximum): 3PPM/year, temperature range: -20~+70℃/-40~+85℃; load capacitance: 8PF, 20PF.

The characteristics of WQC-HC49SMD are: 2P metal package, quartz crystal, with high precision, high frequency stability and reliability, and excellent environmental resistance, and can reach industrial-grade temperature, comply with RoHS standards, and be green and environmentally friendly.

WQC-HC49SMD quartz crystals are used in card readers, digital cameras, computers, notebooks, routers, switches, monitoring and security, etc.

What should I do if the in and out of a passive crystal resonator are soldered upside down?

Passive crystal resonators have no directionality, so it doesn't matter if they are pasted upside down.
 For the passive crystal resonator itself, whether it is leaded or SMD, or has two, three or four pins, there is no distinction between positive and negative poles when installing it by SMD or welding.

In electronic devices, there is an indispensable component, that is, the crystal resonator. Among them, the WQC-HC49S quartz crystal has become the cornerstone of frequency control in many electronic devices with its high precision, high stability and wide application fields.
https://www.weetcap.com/Crystals-Oscillators/WEET-Leaded-Quartz-Crystal-WQC-HC49S.html

1. Basic characteristics of WQC-HC49S quartz crystal

The WQC-HC49S quartz crystal's frequency range is usually between 3.2MHz and 48MHz. Its packaging mode is HC49S, which is a traditional packaging form with large size, but high mechanical strength, good vibration resistance, relatively low price and mature production process. These characteristics make the WQC-HC49S quartz crystal widely used in home appliances, power supply equipment and other occasions where the size requirements are not high.

2. Application fields of WQC-HC49S quartz crystal

A. Digital circuit: In digital circuits, the WQC-HC49S quartz crystal provides standard time for timing control. The work of digital circuits is to complete specific tasks in a certain time according to the circuit design. Without the standard time of time control, the entire digital circuit will become chaotic. The role of the WQC-HC49S quartz crystal is to provide the system with a basic clock signal to ensure the normal operation of the digital circuit.

B. Smart home: In the field of smart home, the WQC-HC49S quartz crystal also plays an important role. Wireless communication, voice recognition, sensor control, etc. all require stable clock signals to accurately transmit and process data. The WQC-HC49S quartz crystal provides a reliable clock signal for smart home devices with its high precision and stability.

C. Remote control and modem: In devices such as remote control and modem, the WQC-HC49S quartz crystal also plays a key role. It provides these devices with a stable frequency output, which improves the accuracy and stability of data transmission.

3. Advantages of WQC-HC49S quartz crystal

The high precision, high stability and wide application field of the WQC-HC49S quartz crystal make it an ideal choice for frequency control in many electronic devices. Its lower price and mature production technology also make it highly competitive in the market.

SMBJ5.0CA is a transient suppression diode commonly used for circuit protection, such as protecting automotive power lines and RS-485 communication interfaces. Its fast response, high pulse power, and low leakage current characteristics enable it to effectively clamp overvoltage and prevent circuit damage.

https://www.weetcap.com/Diodes-Rectifiers/WEET_SMB_SMBJ_Series.html

TVS transient suppression diodes are widely used in fields such as automobiles, household appliances, communication equipment, AC/DC power supplies, instrumentation, and new energy due to their fast response speed, high transient power, low leakage current, easy control of clamping voltage, small breakdown voltage deviation, high reliability, and small size.

SMBJ5.0CA， One of the members of the SMBJ family, its compatriots include: SMBJ5.0A/CA、SMBJ6.0A/CA、SMBJ6.5A/CA、SMBJ7.0A/CA、SMBJ7.5A/CA、SMBJ8.0A/CA、SMBJ8.5A/CA、SMBJ9.0A/CA、SMBJ10A/CA、SMBJ11A/CA、SMBJ12A/CA、SMBJ13A/CA、SMBJ14A/CA、SMBJ15A/CA、SMBJ16A/CA、SMBJ17A/CA、SMBJ18A/CA、SMBJ19A/CA、SMBJ20A/CA、SMBJ22A/CA、SMBJ24A/CA、SMBJ26A/CA、SMBJ28A/CA、SMBJ30A/CA、SMBJ33A/CA、SMBJ36A/CA、SMBJ40A/CA、SMBJ43A/CA、SMBJ45A/CA、SMBJ48A/CA、SMBJ51A/CA、SMBJ54A/CA、SMBJ58A/CA、SMBJ60A/CA、SMBJ64A/CA、SMBJ70A/CA、SMBJ75A/CA、SMBJ78A/CA、SMBJ80A/CA、SMBJ85A/CA、SMBJ90A/CA、SMBJ100A/CA、SMBJ110A/CA、SMBJ120A/CA、SMBJ130A/CA、SMBJ140A/

WQC-TF7015 is a thin industrial-grade 32.768khz passive crystal (crystal resonator), which is the main model in WEET SMD tuning fork crystal sales. With a small size and series resistance, the crystal has stable and reliable performance and is suitable for various small electronic devices with high quality requirements.

https://www.weetcap.com/Crystals-Oscillators/WEET-WQC-TF7015-32.768KHz-SMD-Tuning-Fork-Crystal.html

Compared with other series of WEET SMD crystals, the biggest feature of WQC-TF7015 is its ultra-thinness, with a thickness of only 1.4mm.

WQC-TF7015 quartz crystal resonator. 32.768K clock crystal is a small, thin, and light-weight surface tuning fork crystal resonator. The product has excellent heat resistance and environmental resistance, can give full play to the excellent electrical characteristics of the crystal, complies with RoHS regulations, and meets the high-temperature reflow temperature curve requirements of Pb-free soldering. The metal shell packaging enables the product to exert better impact resistance than the ceramic resonator shell when encapsulating.

When selecting the chip of the quartz crystal, attention should be paid to the temperature range and the frequency difference requirements within the crystal temperature range. When the temperature range of the chip crystal is wide (-40℃-85℃), the crystal cutting angle should be slightly higher than the narrow temperature (-10℃-70℃) cutting angle.

The installation and welding of the crystal resonator requires special attention. If the operation is improper, it will cause damage to the crystal; in severe cases, it will directly stop oscillating; more troublesome is that it will cause soft damage, and the crystal can still work normally, but the hidden danger is buried in it, and it will suddenly stop oscillating during subsequent operation. Welding can be divided into manual and machine welding, and machine welding can be divided into wave soldering and reflow soldering. WEET leaded crystal welding can use wave soldering and manual soldering, and WEET SMD crystal uses reflow soldering or a small amount of manual soldering.

32.768KHZ is also called a Real-Time Clock crystal, and RTC is also the manifestation of a 32.768KHZ real-time clock. Its function is to generate a timing circuit reference signal, including all real-time clock crystal RTC, which are generally 32.768 or its multiples. 32.768KHZ crystals are divided into direct plug-in and patch. The 32.768KHZ direct plug-in crystal has only 2 pins, both of which are functional pins, and there is no ground pin; the 32.768KHZ patch crystal depends on how many pins there are. If there are only two pins, it is the same as the direct plug-in. If there are 4 pins, determine which two functional pins are on the homepage, and the other two pins can be grounded or left floating. If it is an active crystal, the four pins are SPXO, TCXO, VC-TCXO, and VCXO, then one of their pin definitions is GND, and it is OK to directly connect to the ground.

If the crystal does not oscillate, you can try to arrange and combine the following aspects to find the links that are prone to problems. Combined with your own problem points, it is easier to find the reason for the non-oscillation.

https://www.weetcap.com/Crystals-Oscillators/WEET-WQC-TF3215-32.768KHz-SMD-Tuning-Fork-Crystal.html

1. Crystal excitation power

We all know that the crystal is a passive component, which mainly requires a certain excitation power provided by the IC to work normally. Therefore, this excitation power is an important part of the branch factory. If the excitation power is too low, the crystal will not easily generate a signal, and it will not be easy to oscillate. However, if the excitation power is too high, it will form over-excitation, which will easily cause damage to the quartz chip, resulting in the phenomenon of stopping oscillation. To solve the problem of crystal not oscillating, at least the following three factors must be tested: oscillation frequency (frequency matching), oscillation margin (negative impedance) and excitation power.

2. Brand and load capacitance of crystal

Load capacitance is very important. Load capacitance refers to the sum of all effective capacitances inside and outside the two leads of the crystal connected to the IC block. WEET brand is a reliable and trustful supplier, popular 32.768KHZ crystals: WQC-TF206,WQC-TF308,WQC-TF1610,WQC-TF2012,WQC-TF3215,WQC-TF7015,WQC-TF2060,WQC-TF3080,WQC-TF7015

3. Grounding method of crystal pin

The shell of the crystal is metal. When packaging, the pad can be made into a mechanical pad and left hanging. The iron wire is fixed to the top of the Vanke and then grounded (grounding is mainly to avoid electromagnetic interference of the circuit, because some circuits are not reasonable during wiring, which can easily cause electromagnetic interference and cause problems with the crystal)

4. Reduce the heating time when the crystal is welded

Check whether the welding temperature of the crystal is high, causing secondary damage to the crystal, and do not exceed the required welding temperature.

5. Use active crystal oscillator

Active crystal oscillators are all built-in circuits, so there is no circuit matching problem, which greatly avoids the occurrence of crystal oscillator non-oscillation problems.

 WEET popular series:
 WQS-OSC3225,WQS-OSC5032,WQS-OSC7050,WQS-3Z3225,WQS-5Z5032,WQS-7Z7050

With the popularization of 5G technology, the rapid development of the Internet of Things, and the continuous innovation of electronic devices, the demand for high-performance, miniaturized, and low-power crystal resonators will continue to grow.

WQC-TF2012 has broad development prospects in the future market with its excellent performance and characteristics. It is expected that in the future, these crystal resonators will continue to be optimized and upgraded to meet more complex and diverse application requirements. At the same time, with the advancement of manufacturing processes and the reduction of costs, they will be widely used in more fields, promoting the further development of electronic technology.
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Application Fields
 1. Internet of Things Devices
 In fields such as smart agriculture and industrial Internet of Things, WQC-TF2012 provides precise frequency references for various sensors and in a wide range of applications in the Internet of Things, including smart homes and control modules. For example, in smart door locks and environmental monitoring equipment in smart homes, stable frequencies ensure accurate data transmission and timely response of equipment.
 2. Consumer electronics
 In consumer electronics such as mobile phones, tablets, and wearable devices, they provide reliable clock signals for the system, ensuring smooth operation of the device and a good user experience. For example, in Bluetooth headsets, precise frequency control ensures stable audio transmission and improves the sound quality.
 3. Automotive electronic systems
 Many electronic systems in cars, such as engine control units, airbag systems, and in-car entertainment systems, rely on stable frequency sources. The high reliability and stability of these crystal resonators can meet the working requirements of automotive electronics in harsh environments and ensure the safety and performance of vehicles.
 4. Medical equipment
 In the medical field, such as blood glucose meters, blood pressure monitors, and electrocardiogram equipment, precise frequency control is essential for accurate measurement and diagnosis. The DST series of crystal resonators provides a strong guarantee for the accuracy and reliability of medical equipment.

1. Communication equipment: In communication equipment, S1M is commonly used to protect signal lines and data lines from damage caused by voltage spikes.

2. Automotive electronics: In key electronic systems such as automotive electronic control units (ECUs) and sensors, US1A can effectively prevent voltage spikes from affecting the system.

3. Power inverter: S1M is commonly used as a rectifier to convert AC power to DC power and provide stable output voltage.

4. LED lighting: In LED driving circuits, S1M can protect LED beads from voltage spikes and surges, extending their service life.

5. Industrial applications: In automated machinery and industrial control systems,  S1M can protect equipment from surges and other power interference.

https://www.weetcap.com/Diodes-Rectifiers/WEET_SMA_S1A_THRU_S1Y.html

Typical Application of WEET SMAJ5.0CA:
 1. Communication equipment protection: SMAJ5.0CA can be used to protect sensitive circuits in communication equipment, such as radio frequency (RF) receivers and transmitters, to prevent damage caused by high voltage.
 2. Computer interface protection: In computer interfaces such as USB, HDMI, and Ethernet ports, SMAJ5.0CA can resist voltage spikes that may be introduced by external power and data lines, protecting the stability of data transmission and device security.
 3. Consumer electronics: In smartphones, tablets, and other portable devices, using SMAJ5.0CA can avoid the impact of voltage anomalies caused by fast charging on internal microcircuits.
 4. Industrial applications: SMAJ5.0CA is widely used in control systems and sensor devices in industrial environments to protect these devices from voltage fluctuations and interference generated during device startup and shutdown.
 5. Automotive Electronics: In automotive electronic systems such as engine control units (ECUs), entertainment systems, etc., SMAJ5.0CA can prevent transient voltages caused by unstable vehicle power systems and improve the overall reliability of electronic systems.
 Main Parameter characteristics of WEET SMAJ5.0CA:
 1. Voltage protection level: SMAJ5.0CA is designed to provide protection at 5V operating voltage and is an ideal choice for low voltage applications.
 2. Fast response time: The TVS diode of this model can respond to voltage spikes in a very short time, quickly limiting the voltage that exceeds the safe threshold below the safe level.
 3. High energy absorption capacity: SMAJ5.0CA can absorb up to 400 watts of peak pulse power, effectively protecting the circuit from transient overvoltage damage.
 4. Low leakage current: Under normal operating voltage, the leakage current of SMAJ5.0CA is very low, ensuring that it will not cause additional power consumption and heat loss to the circuit.
 5. Packaging type: SMA packaging is used, which makes SMAJ5.0CA not only small in size, but also easy to install on the board, suitable for compact circuit design.

https://www.weetcap.com/Diodes-Rectifiers/WEET_SMA_SMAJ_Series.html

Overall, SMAJ5.0CA has a wide range of applications and can be found in multiple fields due to its excellent protection performance and electrical parameter characteristics. SMAJ5.0CA is an indispensable protective component in both consumer electronics and high demand industrial applications.