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When using a 16MHz crystal oscillator in electronic circuits, it's common to include capacitors as part of the oscillator circuit to ensure proper operation and stability. These capacitors are often referred to as "loading capacitors" or "decoupling capacitors." They help tune the crystal oscillator to its intended frequency and reduce noise and interference. two capacitors are used—one connected to each side of the crystal. These capacitors help stabilize the oscillation by providing feedback to the crystal and compensating for its inherent capacitance. The combination of the crystal's inherent capacitance and the external loading capacitors determines the oscillator's resonant frequency.
Typical 2.5×2.0×0.55 mm ultra thin SMD crystal
5.Ceramic seam weld package with excellent reliability performance, available to surface mount technology and IR reflow process
Electrical Parameters
| Item | Electrical Specification | |||
| Min. | Type | Max. | Units | |
| Nominal Frequency | 27 | MHz | ||
| Mode of Vibration | Fundamental | |||
| Frequency Tolerance | -20 | - | 20 | ppm |
| Operating Temperature Range | -40 | - | 85 | ℃ |
| Frequency Stability | -20 | - | 20 | ppm |
| Storage Temperature | -55 | - | 125 | ℃ |
| Load capacitance | - | 10 | - | pF |
| Equivalent Series Resistance | - | - | 100 | Ω |
| Drive Level | - | 10 | 100 | μW |
| Insulation Resistance | 500 | - | - | MΩ |
| Shunt Capacitance | - | - | 5 | pF |
| Aging Per Year | -5 | - | 5 | ppm |
| Package type | P2SBA | |||
Dimensions
Reflow
| Profiles Feature | Pb-Free Assembly |
| Average Ramp-up Rate (Ts max to Tp) | 3℃/Second max. |
| Preheat ■ Temperature Min (Ts min) ■ Temperature Max (Ts max) ■ Time (ts min to ts max) | 125℃ 200℃ 60~180 seconds |
| Time maintained above ■ Temperature (TL) ■ Time (tL) | 217℃ 60~150 seconds |
| Peak/Classification Temperature (Tp) | 260℃ |
| Time within 5℃ of actual Peak Temperature (tp) | 20~40 seconds |
| Ramp-down rate | 6℃/second max. |
| Time 25℃ to Peak Temperature | 8 minutes max. |
| Suggest reflow times | 3 Times max |
FAQ:
| Series Product | Quartz crystal size | Lead Time |
| HC49 Series | HC-49SMD,HC-49S,HC-49U | 1-2 weeks |
| SMD quartz Crystals | 2012/2016/2520/3225/5032/6035/7050/8045 | 1-4 weeks |
| SMD crystal Oscillators | 2016/2520/3225/5032/7050 | 1-3 weeks |
| TCXO | 2520/3225/5032 | 2-5 weeks |
| SMD Watch/tuning fork Crystals | PSX315/PSX415/PSX519/PMX145/PMX206/PMX206F/PMX206FA/PMX405/PMX406 | 1-2 weeks |
| VCXO | 2520/3225/5032 | 2-5weeks |
| TCVCXO | 2520/3225/5032 | 2-5weeks |
| DIP Watch/tuning fork Crystals | DT206/DT308 | 1-2weeks |
| ZTA/ZTT Series | ZTTCC/ZTACC/ | 1-2weeks |
12.Free crystal samples and shipment fee ?
We provide you 20pcs free quartz crystals samples [no free samples for oscillators and TCXO,VCXO, and VCTCXO]. Customers to pay only the shipping fees.
| SMD or DIP | Crystal package size[mm] | 2pads ,3pads or 4pads... |
| Frequency: GHz,MHz or KHz | frequency tolerance[ppm] | frequency characteristics over temperature[ppm] |
| load capacitance[pF] | operating temperature[℃] | resistance(ESR)[Ω/㏀] |
| Supply Voltage[V] | Output type | application |
| Crystal Bar | China |
| Base | NEC (Japan) |
| Outer covering | NEC (Japan) |
| Resin | HENKEL (Germany) |
| High-temperature crystal | KDS (Japan) |
15. DIP cylinder crystal Production & Test Equipment
| Equipment Name | Manufacturer | Quantity | Purpose |
| Coaters | Korea | 3 | put the silver on the tuning fork tips |
| Auto Dispensing | Japan | 5 | Stick the crystal on base |
| Fine tuning | China | 32 | Frequency modulation and control |
| Welding | China | 12 | To weld the outer covering and base |
| Laser Marking | China | 3 | Marking on the outer covering |
| 250B | USA | 3 | Test the frequency |
| High and low temperature testing | USA | 3 | High and low temperature testing |
| Automatic testing | China | 8 | Test the crystal |
Insulated resistance tester
| China | 6 | Test the crystal |
| NO. | Use process | Equipment Name | Model | manufacturer | Unit | Quantity |
| 1 | Pin bending | Auto pin bending | DT206/308 | CHINA | PCS | 2 |
| 2 | Pin cutting | Auto pin cutting | DT308/206 | CHINA | PCS | 6 |
| 3 | Spot welding | spot welding | SW-Ⅱ | CHINA | PCS | 16 |
| 4 | Auto spot welding | SW-300(refit ) | CHINA | PCS | 2 | |
| 5 | Plastic package | HF Preheat machine | HDP-320 | CHINA | PCS | 4 |
| 6 | hydraulic machine | MP-125 | CHINA | PCS | 4 | |
| 7 | Orthopedic | Hydraulic Presses | YN-12 | CHINA | PCS | 10 |
| 8 | Marking | Laser Marking | YAG-M-50 | CHINA | PCS | 5 |
| 9 | Testing equipment | Clock Tester | QWA-5A | CHINA TW | PCS | 1 |
| 10 | Crystal impedance meter | FT-327B | CHINA | PCS | 20 | |
| 11 | network analyzer | 250B | USA | PCS | 3 | |
| 12 | Frequency meter | FT-100T | CHINA | PCS | 15 | |
| 13 | Automatic testing | BJ-308/206 | CHINA | PCS | 20 | |
| 14 | crystal calibration | GY3020 | CHINA TW | PCS | 1 | |
| 15 | Crystal impedance meter | CZ-5C | CHINA TW | PCS | 1 | |
| 16 | Spectrometer | ZDX8600 | CHINA TW | PCS | 1 | |
| 17 | Reflow | T1000 | CHINA | PCS | 1 | |
| 18 | Insulated resistance tester | TH3681A | CHINA TW | PCS | 1 | |
| 19 | Incubator | 4310 | USA | PCS | 4 | |
| 20 | Taping | Auto Taping | PMX206 | CHINA | PCS | 9 |
Ø A-crystal supports its customer base through the pursuit of continuous quality improvement.
Ø World-Class leading product designs.
Ø ISO-9001 certified production and Quality management
Ø Reliability testing for all products to ensure quality stability.
Ø Strict quality evaluation of all raw material suppliers
Ø Customers satisfaction feedback program for quality assurance
Ø Complete sales & after-sales quality service and customer care
Ø Regular employee trainings to achieve continuous quality improvement.
Management participation programs to promote commitment to highest quality standards and customer focus.
Soldering Characteristics
A variety of methods can be used to solder A-Crystal products to PCB and substrates
Ø Wave or Dual Wave
Ø Hot Air or Convection Flow
Ø Vapor Phase Reflow
Ø Infrared Reflow
Ø Bubble Solder Immersion
Ø Tohers (Laser,etc)
| Model | Pre-heating time | Reflow Temperature | Reflow time |
| SMD Tuning fork 01(lead free) | 60-120 Seconds | 230℃ Max | 10 Seconds Max |
| SMD Tuning fork 02(no lead free for solder, but ROHS compliant) | 30-60 Seconds | 260℃ Max | 10 Seconds Max |
| HC-49U | 30-60 Seconds | 250℃ Max | 10 Seconds Max |
| HC-49S series | 30-60 Seconds | 250℃ Max | 10 Seconds Max |
| HC-49SM series | 30-60 Seconds | 250℃ Max | 10 Seconds Max |
| UM series | 30-60 Seconds | 250℃ Max | 10 Seconds Max |
| SMD crystal units | 30-60 Seconds | 250℃ Max | 10 Seconds Max |
| Clock Oscillator | 30-60 Seconds | 250℃ Max | 5 Seconds Max |
| VCXO | 30-60 Seconds | 250℃ Max | 5 Seconds Max |
| SMD oscillator | 30-60 Seconds | 260℃ Max | 10 Seconds Max |
| Ceramic Resonator | 30-60 Seconds | 225℃ Max | 10 Seconds Max |
| Ceramic Filter | 30-60 Seconds | 225℃ Max | 10 Seconds Max |
Package is made of corrugated paper with thickness of 0.8cm.
Each Package contains 10 inner boxes, each box has 1 plastic reel
Each reel has 3000 pieces of Crystal Resonators
Therefore Total package contains 30,000 pieces of crystal resonators.
Large package contains 20 inner boxes （60, 000 pieces of crystal resonators）
Pricing: Highly competitive pricing
Quality: ISO 9001 certified quality system and knowledgeable quality assurance team.
Delivery : Short lead-time for standard products and on time delivery for customized products.
Service: Comprehensive skilled technical support
