SMD Tuning Fork Crystal PMX145

Categories KHz Crystals, Tuning Fork Crystals and 32.768KHz Oscillators

The Epson MC-146 series, which is a type of low-profile SMD (Surface Mount Device) crystal unit designed for various electronic applications. These crystal units typically operate in the kHz frequency range.These crystal units are designed with a low profile, making them suitable for applications with space constraints or where a compact design is desired. Crystal units like the MC-146 series can be used in a wide range of applications, including real-time clocks (RTCs), microcontrollers, communication devices, sensor networks, and more.
It's important to consider the appropriate load capacitance when using the MC-146 series for proper oscillation.

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Features

Ultra Miniature SMD Tuning Fork Crystal Resonator
Plastic molded SMD tuning fork crystal of heat-resistance
Metal Lid Connected To GND Terminal To Reduce EMI
Suitable For Mobile Communications And Consumer Devices.

Applications

Mobile Communications And Consumer Devices, Etc.
Smart Card And Wearable Devices

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6914 size 32.768kHz Watch Crystal
Highly competitive price for watch crystal with 6.9 x 1.4 x 1.3mm. PMX145 also with excellent reliability performance. And is available in a choice of circuit conditions at 32.768kHz which suitable for surface mount technology and IR reflow process.

Electrical Specifications

Parameter	Value
Frequency Range	32.768KHz
Frequency Tolerance	±20ppm
Temperature Coefficient	-0.034±0.006 ppm/(℃)2
Turnover temperature	25±5℃
Operating Temperature Range	-40℃ to 85℃
Storage Temperature Range	-55℃ to 125℃
Quality factory	60000Typ
Series resistance	65 KΩ
Shunt Capacitance	1.8pF Typ
Load Capacitance	12.5pF
Insulator Resistance	500 MΩ
Drive Level	1μW
Capacitance ratio	450Typ
Aging	±3ppm

Dimension

Reflow

FAQ:

How does A-Crystal support you: Free samples , OEM, Reliability test report, Product return report (8D report), RoHS substances compliant, REACH substances compliant
What’s A Crystal’s performance Certificate?ISO 9001 quality management [9001 ISO 2015], ISO14001
How many Production patents A Crystal has: 16
Payment terms: T/T in advance
Which express service: DHL, UPS, TNT, FedEx
A Crystal’s monthly production capacity for 32.768 oscillators: 1kk
What’s the MOQ/Standard packing quantity: 3k per reel ( a crystal 32.768)
Lead Time for the 32.768 khz clock oscillator: 3days-14days
A Crystal produces tuning fork crystals with 32.768 khz xtl.
Factory address: 32th Building, A District, Feiyue Technology Innovation Park, Jiaojiang, Taizhou, Zhejiang, China. ZIP:318014
What is the lead time for:

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.

What basic information to provide when ordering a crystal?

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

Main sources of ACrystal component parts

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

PMX145/206/308SMD Production & Test Equipment

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	Spot welding	Auto spot welding	SW-300(refit )	CHINA	PCS	2
5	Plastic package	HF Preheat machine	HDP-320	CHINA	PCS	4
6	Plastic package	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

Quality Management

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.

How’s a-crystal’s Customer Care: returns process

How to see a crystal production line radio on tube: https://www.acrystals.com/about-us_d1

How to attach a tuning fork to PCB/A crystal recommended Solder Reflow?

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

What’s the pictures of the A crystal time quartz watch XTAL/ timing oscillator/tuning fork resonator?

Package:

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）

Why A Crystal?

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

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PMX145-KHz