Actual size
Crystal unit
Specifications (characteristics)
Item
Symbol
Specifications
Conditions / Remarks
FC-12D
FC-12M
Nominal frequency range
f_nom
32.768 kHz
32.768 kHz
32 kHz to
77.5 kHz
Please contact us about available
frequencies.
Storage temperature
T_stg
-55 C to +125 C
Storage as single product.
Operating temperature
T_use
-40 C to +85 C
Level of drive
DL
0.25 W Max.
0.5 W Max.
Frequency tolerance
(standard)
f_tol
±20 × 10-6
±20 × 10-6
±30 × 10-6
+25 C, DL=0.1 W
Please ask for tighter tolerance
Turnover temperature
Ti
+25 C ±5 C
Parabolic coefficient
B
-0.04 10-6 / C2 Max.
Load capacitance
CL
7 pF, 9pF, 12.5pF
12.5pF
Please specify
Motional resistance (ESR)
R1
75 k Max.
90 k Max.
90 k to 65 k
Motional capacitance
C1
3.7 fF Typ.
6.4 fF Typ.
7.0 fF to 2.7 fF
Shunt capacitance
C0
0.8 pF Typ.
1.3 pF Typ.
1.6 pF to 0.8pF
Frequency aging
f_age
±3 × 10-6 / year Max.
+25 C, First year
Product name FC-12D 32.768000kHz 12.5 +20.0-20.0
(Standard form) ① ② ③ ④
①Model ②Frequency ③Load capacitance(pF) ④Frequency tolerance(× 10-6, +25 C)
External dimensions
(Unit: mm)
.
Footprint (Recommended)
(Unit: mm)
kHz RANGE CRYSTAL UNIT
FC - 12D / FC - 12M
Frequency range : 32.768 kHz (32 kHz to 77.5 kHz)
External dimensions : 2.05 × 1.25 × 0.35 mm···FC-12D
: 2.05 × 1.2 × 0.6 mm···FC-12M
Overtone order : Fundamental
Applications : Smart card (Please contact us for
except Smart card use.)···FC-12D
: Small devices···FC-12M
Product Number (please contact us)
FC-12D: X1A000111xxxx00
FC-12M: X1A0000x1xxxx00
FC-12D FC-12M
2.05±0.05
1.2±0.05
0.6 Max.
1.0
0.525
A634J
#1
#2
#1
#2
Internal connection
(TOP VIEW)
FC-12M
0.495
#3
1.25±0.1
0.9
2.05±0.1
0.35 Max.
0.35
#2
#1
#4
Pin #2 is connected to the
device lid.
Please connect to GND.
Do not connect #4 externally.
A115J
#1
#2
#4
#3
FC-12D
FC-12D
0.90
0.65
0.55
0.35
*Do not design any
circuit patterns in the
shaded area.
FC-12M
1.5
0.7
1.4
*Do not design any
circuit patterns in the
shaded area.
