Datasheet

Actual size
Crystal unit
S
p
ecifications
(
characteristics
)
Item Symbol Specifications Conditions / Remarks
Nominal frequency range f_nom 32.768 kHz 20 kHz to 120 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 1.0

W Max.
Frequency tolerance (standard) f_tol 20  10
-6
,

50

10
-6

50

10
-6
,

100

10
-6
+25 C, DL=0.1 W
Turnover temperature Ti +25 C

5 C
Parabolic coefficient B -0.04

10
-6
/ °C
2
Max.
Load capacitance CL 6 pF to

(standard :12.5 pF) Please specify
Motional resistance (ESR) R1 50 k

Max. As per table below
Motional capacitance C1
1.8 fF Typ.
4.0 fF to 0.6 fF
MC-306
2.0 fF Typ. MC-405 / 406
Shunt capacitance C0
0.9 pF Typ.
2.0 pF to 0.6 pF
MC-306
0.85 pF Typ. MC-405 / 406
Frequency aging f_age 3  10
-
6
/ year Max.

5

10
-
6
/ year Max. +25 C, First year
Motional resistance
(
ESR
)
Frequency
20 kHzf_nom< 31.2 kHz 31.2 kHz

f_nom< 40 kHz 40 kHz

f_nom< 90 kHz 90 kHzf_nom

120 kHz
Motional resistance
55 k Max. 35 k

Max. 20 k

Max. 12 k

Max.
Product name MC-306 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
)

.
Foot
p
rint
(
Recommended
)
(
Unit:mm
)

MC-306 MC-405 / 406
MC-306
The metal case inside of the molding compound may be exposed on the top or bottom of this product.
This purely cosmetic and does not have any effect on quality, reliability or electrical specs.
Do not connect #2 and #3 to external device.
Internal connection
(TOP VIEW)
#4
#1
#2
#3
1.9
(0.9)
(0.9)
5.5
0.5
2.54 Max.
2.38
8.0 Max.
#4
#1
#2
#3
3.8 Max.
3.2
32.768 k
E 571
Do not connect #2 and #3 of MC-406 to external device.
The first digit of No. means: 5×××× MC-405
6×××× MC-406
MC-405 / 406
#4
#1
#2
#3
#4
#1
#2
#3
Internal connection in MC-406
(TOP VIEW)
Internal connection in MC-405
(TOP VIEW)
0.2 Min.
3.6 Max.
3.15
2.54
2.54
4.06 Max.
#1
#4
#3
#2
10.41 Max.
9.60
32.768 k
E 6571A
0.51
0.51
2.29
MC-306
MC-405
1.52
0.8
4.1 3.9 4.1
1.52
4.1 3.9 4.1
4.1
MC-406
1.9 1.9
1.3
4.2
1.3
1.3
kHz RANGE CRYSTAL UNIT
MC - 306
MC - 405 / MC - 406
Frequency range : 32.768 kHz (20 kHz to 120 kHz)
Thickness : 8.0 × 3.8 × 2.54 mm ···MC-306
10.41 × 4.06 × 3.6 mm ···MC-405
/ 406
Overtone order : Fundamental
Applications : Clock and Microcomputer
Product Number (please contact us)
MC-306 : Q1xMC3062xxxx00
MC-405 : Q1xMC4052xxxx00
MC-406 : Q1xMC4062xxxx00