Tuning Fork Quartz Crystals
32.768 kHz Tubular Crystal
NTF3238 / NTF3226 Series
Technical Data
Electrical Specifications
NTF3238
NTF3226
Nominal Frequency at 25°C
Frequency Tolerance
f
32.768 kHz
±20 ppm
Turnover Temperature
TO
K
25°C ±5°C
Temperature Characteristic
-0.038ppm/°C2 Typical
Frequency deviation at temperature T
( ∆ f/f = K(T0 – T )2
Quality Factor
Load Capacitance
Series Resistance
Motional Capacitance
Shunt Capacitance
Drive Level
Q
CL
100,000 typ
90,000 typ
12 to 13pF
40KΩ max
0.0027pF typ
1.5pF typ
12 to 13pF
30KΩ max
0.0035pF typ
1.7pF typ
ACTUAL SIZE
RS
Description
C1
The NTF tuning fork type quartz crystal
provides the circuit designer with the ulti-
mate in size, performance, and economic
trade-offs. This highly reliable, stable, and
accurate device is available in two micro-
miniature sizes for real-time or low power
applications operating from a 32.768 kHz
reference frequency.
C0
Pd
1µW max
Aging
∆ F/f
First 30 Days: 3.0ppm
First Year: 5.0ppm
Operating Temperature Range
Storage Temperature Range
-10 to +60°C
-30 to +70°C
Applications & Features
Mechanical
• Very small, compact packaging
• Rugged, resistant to shock and vibration
• Excellent resistance to heat shock and
environmental conditions
Shock:
Solderability:
Terminal Strength:
MIL-STD-883, Method 2002, Condition B
MIL-STD-883, Method 2003
MIL-STD-202, Method 211, Conditions A and C
MIL-STD-883, Method 2007, Condition A
MIL-STD-202, Method 215
Vibration:
Solvent Resistance:
Resistance to Soldering Heat:
• Ideal for real-time clocks
MIL-STD-202, Method 210, Condition B
Environmental
Gross Leak Test:
Fine Leak Test:
Thermal Shock:
MIL-STD-883, Method 1014, Condition C
MIL-STD-883, Method 1014, Condition A2
MIL-STD-883, Method 1011, Condition A
MIL-STD-883, Method 1004
Moisture Resistance:
All specifications are subject to change without notice.
DS-118 REV E
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