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FCX-4U Quartz Crystal | Resistance Welded HC-49U

DIP HC-49U

category:

Quartz Crystal

Products

FEATURE

FCX-4U is a resistance-welded quartz crystal unit in HC-49U package. It offers improved frequency pullability, lower ESR, and mechanical robustness. With a broad frequency range from 1.8 to 64 MHz and compatibility with typical load capacitances, it is widely used in consumer electronics, microcontroller platforms, and test instrumentation.

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Datasheet

Product Description

FCX-4U Quartz Crystal (Resistance Welded HC-49U)

Key Features

Standard HC-49U through-hole package
Resistance welded housing for high mechanical strength
Frequency range: 1.8 ~ 64 MHz
Frequency tolerance: ±30 ppm @25°C ±3°C
Frequency stability:
- ±50 ppm @ -20 to +70°C
- ±50 ppm @ -40 to +85°C

Load capacitance options: 10 / 18 / 20 pF or custom
Drive level: 100 ~ 500 µW
ESR (Equivalent Series Resistance):
- ≤300 Ω @ 1.8–2.4 MHz
- ≤200 Ω @ 2.4–3.5 MHz
- ≤80 Ω @ 3.5–7 MHz
- ≤40 Ω @ 7–54 MHz
- ≤80 Ω @ >54 MHz

Aging: ±3 ppm/year (1st year)
RoHS & REACH compliant, Pb-free

Applications

Consumer electronics
Test and measurement systems
Computer peripherals
Microcontroller and FPGA timing

Electrical Specifications

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Nominal Frequency	F	1.8	–	64	MHz	@25°C, RH 40~70%
Frequency Tolerance	FT	–	±30	–	ppm	@25°C ±3°C
Frequency Stability	ST	±50	–	±50	ppm	@-40~+85°C or -20~+70°C
Operating Temperature	Topr	-40	25	+85	°C	–
Load Capacitance	CL	10	–	20	pF	Or customer specified
Drive Level	DL	100	–	500	µW	–
ESR	–	–	–	300	Ω	Varies by frequency segment
Aging (1st year)	–	–	±3	–	ppm/year	@25°C

Key words:

HC-49U

HC-49UX

HC-49ULF

VXA1

VXA4