首页 > 器件类别 > 无源元件

SMDTC03680TB00MQ00

Film Capacitors SMD-PET 0.68 F 63 VDC 7.2x6.1x5 SC2824

器件类别:无源元件   

厂商名称:WIMA

厂商官网:https://www.wima.de/

下载文档
SMDTC03680TB00MQ00 在线购买

供应商:

器件:SMDTC03680TB00MQ00

价格:-

最低购买:-

库存:点击查看

点击购买

器件参数
参数名称
属性值
Product Attribute
Attribute Value
制造商
Manufacturer
WIMA
产品种类
Product Category
Film Capacitors
端接类型
Termination Style
SMD/SMT
产品
Product
SMD Film Capacitors
电介质
Dielectric
Polyethylene Terephthalate (PET)
电容
Capacitance
0.68 uF
电压额定值 AC
Voltage Rating AC
40 VAC
电压额定值 DC
Voltage Rating DC
63 VDC
容差
Tolerance
20 %
最小工作温度
Minimum Operating Temperature
- 55 C
最大工作温度
Maximum Operating Temperature
+ 100 C
封装 / 箱体
Package / Case
2824 (7260 metric)
长度
Length
7.2 mm
宽度
Width
6.1 mm
高度
Height
5 mm
类型
Type
Metallized SMD Film Capacitor
管脚数量
Number of Pins
2
电容-nF
Capacitance - nF
680 nF
电容-pF
Capacitance - pF
680000 pF
文档预览
WIMA SMD-PET
Metallized Polyester (PET) SMD Film Capacitors with Box Encapsulation.
Capacitances from 0.01
mF
to 6.8
mF.
Rated Voltages from 63 VDC to 1000 VDC.
Size Codes from 1812 to 6054.
Special Features
˜
Size codes 1812, 2220, 2824,
4030, 5040 and 6054 with PET
and encapsulated
˜
Operating temperature up to 100° C
˜
Self-healing
˜
According to RoHS 2011/65/EU
D
Electrical Data
Capacitance range:
0.01
mF
to 6.8
mF
Rated voltages:
63 VDC, 100 VDC, 250 VDC, 400 VDC,
630 VDC, 1000 VDC
Capacitance tolerances:
±20%, ±10% (±5% available subject
to special enquiry)
Operating temperature range:
–55+ C to +100+ C (+125° C available
subject to special enquiry)
Climatic test category:
55/100/21 according to IEC
for size codes 1812 to 2824
55/100/56 according to IEC
for size codes 4030 to 6054
Insulation resistance
at +20+ C:
U
r
U
test
C
0.33
mF
3.75 x 10
3
1 x 10
4
63 VDC 50 V
100 VDC 100 V
250 VDC 100 V
Test voltage:
1.6 U
r
, 2 sec.
Voltage derating:
A voltage derating factor of 1.25 % per K
must be applied from +85) C for DC
voltages and from +75) C for AC
voltages
Reliability:
Operational life
300 000 hours
Failure rate
2 fit (0.5 x U
r
and 40+ C)
Typical Applications
For general DC-applications e.g.
˜
By-pass
˜
Blocking
˜
Coupling and decoupling
˜
Timing
Construction
Dielectric:
Polyethylene-terephthalate (PET) film
Capacitor electrodes:
Vacuum-deposited
Internal construction:
0.33
mF
< C
6.8
mF
1250 sec (M¸ x
mF)
3000 sec (M¸ x
mF)
Measuring time: 1 min.
Dissipation factors
at +20) C: tan
d
Plastic film
Vacuum-deposited
electrode
Metal contact layer
(schoopage)
Terminating plate
at f
1 kHz
10 kHz
100 kHz
C
0.1
mF
8 x 10
-3
15 x 10
-3
30 x 10
-3
0.1
mF
< C
1.0
mF
8 x 10
-3
15 x 10
-3
C > 1.0
mF
10 x 10
-3
Maximum pulse rise time:
for pulses equal to the rated voltage
Encapsulation:
Solvent-resistant, flame-retardant plastic
case, UL 94 V-0
Terminations:
Tinned plates.
Marking:
Box colour: Black.
Capacitance
m
F
0.01
0.033
0.1
0.33
1.0
3.3
...
...
...
...
...
...
0.022
0.068
0.22
0.68
2.2
6.8
Pulse rise time V/
m
sec
max. operation/test
100 VDC 250 VDC 400 VDC
35/350
20/200
10/100
6/60
4/40
3/30
40/400
40/400
12/120
9/90
7/70
35/350
21/210
14/140
10/100
63 VDC
30/300
20/200
10/100
8/80
3.5/35
3/30
630 VDC 1000 VDC
40/400
25/250
17/170
50/500
32/320
Dip Solder Test/Processing
Resistance to soldering heat:
Test Tb in accordance with DIN IEC
60068-2-58/DIN EN 60384-19.
Soldering bath temperature max. 260+ C.
Soldering duration max. 5 sec.
Change in capacitance
D
C/C
5 %.
Soldering process:
Re-flow soldering (see temperature/time
graphs page 13).
04.18
Packing
Available taped and reeled in blister pack.
Detailed taping information and graphs
at the end of the catalogue.
For further details and graphs please
refer to Technical Information.
17
WIMA SMD-PET
Continuation
D
General Data
Capacitance
0.01
mF
0.015 „
0.022 „
0.033 „
0.047 „
0.068 „
0.1
mF
Size
code
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
2220
2824
4030
2220
2824
4030
2824
4030
2824
4030
4030
5040
6054
63
H
± 0.3
3.0
3.5
3.0
3.0
3.5
3.0
3.0
3.5
3.0
3.0
3.5
3.0
3.0
3.5
3.0
3.0
3.5
3.0
4.0*
3.5
3.0
4.0*
3.5
3.0
4.0*
3.5
3.0
4.0
4.5*
5.0*
4.0
4.5*
5.0*
4.5
5.0*
5.0
4.5
5.0*
5.0
5.0
5.0
5.0
5.0
5.0
6.0
7.0
VDC/40 VAC*
Part number
SMDTC02100KA00_ _ _ _
SMDTC02100QA00_ _ _ _
SMDTC02100TA00_ _ _ _
SMDTC02150KA00_ _ _ _
SMDTC02150QA00_ _ _ _
SMDTC02150TA00_ _ _ _
SMDTC02220KA00_ _ _ _
SMDTC02220QA00_ _ _ _
SMDTC02220TA00_ _ _ _
SMDTC02330KA00_ _ _ _
SMDTC02330QA00_ _ _ _
SMDTC02330TA00_ _ _ _
SMDTC02470KA00_ _ _ _
SMDTC02470QA00_ _ _ _
SMDTC02470TA00_ _ _ _
SMDTC02680KA00_ _ _ _
SMDTC02680QA00_ _ _ _
SMDTC02680TA00_ _ _ _
SMDTC03100KB00_ _ _ _
SMDTC03100QA00_ _ _ _
SMDTC03100TA00_ _ _ _
SMDTC03150KB00_ _ _ _
SMDTC03150QA00_ _ _ _
SMDTC03150TA00_ _ _ _
SMDTC03220KB00_ _ _ _
SMDTC03220QA00_ _ _ _
SMDTC03220TA00_ _ _ _
SMDTC03330KB00_ _ _ _
SMDTC03330QB00_ _ _ _
SMDTC03330TB00_ _ _ _
SMDTC03470KB00_ _ _ _
SMDTC03470QB00_ _ _ _
SMDTC03470TB00_ _ _ _
SMDTC03680QB00_ _ _ _
SMDTC03680TB00_ _ _ _
SMDTC03680VA00_ _ _ _
SMDTC04100QB00_ _ _ _
SMDTC04100TB00_ _ _ _
SMDTC04100VA00_ _ _ _
SMDTC04150TB00_ _ _ _
SMDTC04150VA00_ _ _ _
SMDTC04220TB00_ _ _ _
SMDTC04220VA00_ _ _ _
SMDTC04330VA00_ _ _ _
SMDTC04470XA00_ _ _ _
SMDTC04680YA00_ _ _ _
Size
code
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
1812
2220
2824
2220
2824
4030
2220
2824
4030
2824
4030
5040
2824
4030
5040
4030
5040
5040
5040
6054
100 VDC/63 VAC*
H
Part number
± 0.3
3.0 SMDTD02100KA00_ _ _ _
3.5 SMDTD02100QA00_ _ _ _
3.0 SMDTD02100TA00_ _ _ _
3.0 SMDTD02150KA00_ _ _ _
3.5 SMDTD02150QA00_ _ _ _
3.0 SMDTD02150TA00_ _ _ _
3.0 SMDTD02220KA00_ _ _ _
3.5 SMDTD02220QA00_ _ _ _
3.0 SMDTD02220TA00_ _ _ _
3.0 SMDTD02330KA00_ _ _ _
3.5 SMDTD02330QA00_ _ _ _
3.0 SMDTD02330TA00_ _ _ _
3.0 SMDTD02470KA00_ _ _ _
3.5 SMDTD02470QA00_ _ _ _
3.0 SMDTD02470TA00_ _ _ _
3.0 SMDTD02680KA00_ _ _ _
3.5 SMDTD02680QA00_ _ _ _
3.0 SMDTD02680TA00_ _ _ _
4.0* SMDTD03100KB00_ _ _ _
3.5 SMDTD03100QA00_ _ _ _
3.0 SMDTD03100TA00_ _ _ _
4.0 SMDTD03150KB00_ _ _ _
3.5 SMDTD03150QA00_ _ _ _
3.0 SMDTD03150TA00_ _ _ _
4.0 SMDTD03220KB00_ _ _ _
3.5 SMDTD03220QA00_ _ _ _
3.0 SMDTD03220TA00_ _ _ _
4.5 SMDTD03330QB00_ _ _ _
5.0 SMDTD03330TB00_ _ _ _
5.0 SMDTD03330VA00_ _ _ _
4.5 SMDTD03470QB00_ _ _ _
5.0 SMDTD03470TB00_ _ _ _
5.0 SMDTD03470VA00_ _ _ _
5.0 SMDTD03680TB00_ _ _ _
5.0 SMDTD03680VA00_ _ _ _
6.0 SMDTD03680XA00_ _ _ _
5.0 SMDTD04100TB00_ _ _ _
5.0 SMDTD04100VA00_ _ _ _
6.0 SMDTD04100XA00_ _ _ _
5.0 SMDTD04150VA00_ _ _ _
6.0 SMDTD04150XA00_ _ _ _
6.0 SMDTD04220XA00_ _ _ _
6.0 SMDTD04330XA00_ _ _ _
7.0 SMDTD04470YA00_ _ _ _
250 VDC/160 VAC*
Size
H
Part number
code ± 0.3
2220 3.5 SMDTF02100QA00_ _ _ _
2824 3.0 SMDTF02100TA00_ _ _ _
2220
2824
2220
2824
2220
2824
4030
2220
2824
4030
2220
2824
4030
2220
2824
4030
2824
4030
2824
4030
2824
4030
5040
4030
5040
5040
6054
3.5 SMDTF02150QA00_ _ _ _
3.0 SMDTF02150TA00_ _ _ _
3.5 SMDTF02220QA00_ _ _ _
3.0 SMDTF02220TA00_ _ _ _
3.5
3.0
5.0
3.5
3.0
5.0
4.5*
3.0
5.0
4.5*
5.0
5.0
5.0
5.0
SMDTF02330QA00_ _ _ _
SMDTF02330TA00_ _ _ _
SMDTF02330VA00_ _ _ _
SMDTF02470QA00_ _ _ _
SMDTF02470TA00_ _ _ _
SMDTF02470VA00_ _ _ _
SMDTF02680QB00_ _ _ _
SMDTF02680TA00_ _ _ _
SMDTF02680VA00_ _ _ _
SMDTF03100QB00_ _ _ _
SMDTF03100TB00_ _ _ _
SMDTF03100VA00_ _ _ _
SMDTF03150TB00_ _ _ _
SMDTF03150VA00_ _ _ _
0.15 „
0.22
0.33
0.47
5.0 SMDTF03220TB00_ _ _ _
5.0 SMDTF03220VA00_ _ _ _
5.0
5.0
6.0
5.0
6.0
SMDTF03330TB00_ _ _ _
SMDTF03330VA00_ _ _ _
SMDTF03330XA00_ _ _ _
SMDTF03470VA00_ _ _ _
SMDTF03470XA00_ _ _ _
0.68 „
1.0
1.5
2.2
3.3
4.7
6.8
mF
6.0 SMDTF03680XA00_ _ _ _
7.0 SMDTF04100YA00_ _ _ _
*
Version according to catalogue 2013
still available
Part number completion:
Tolerance:
Packing:
Pin length:
20 % = M
10 % = K
5%=J
bulk = S
none = 00
Taped version see page 147.
* AC voltage: f = 50 Hz; 1.4 x U
rms
+ UDC
U
r
Dims. in mm.
Rights reserved to amend design data without prior notification.
18
Continuation page 19
04.18
WIMA SMD-PET
Continuation
D
General Data
400 VDC/200 VAC*
630 VDC/300 VAC*
Capacitance Size
H
Size
H
Part number
Part number
code ± 0.3
code ± 0.3
0.01
mF
2824 3.0 SMDTG02100TA00_ _ _ _ 4030 5.0 SMDTJ02100VA00_ _ _ _
4030 5.0 SMDTG02100VA00_ _ _ _
0.015 „
0.022 „
0.033 „
0.047 „
0.068 „
0.1
mF
2824
4030
2824
4030
2824
4030
2824
4030
4030
5040
4030
5040
4030
5040
5040
5040
6054
3.0 SMDTG02150TA00_ _ _ _
5.0 SMDTG02150VA00_ _ _ _
5.0* SMDTG02220TB00_ _ _ _
5.0 SMDTG02220VA00_ _ _ _
5.0 SMDTG02330TB00_ _ _ _
5.0 SMDTG02330VA00_ _ _ _
5.0 SMDTG02470TB00_ _ _ _
5.0 SMDTG02470VA00_ _ _ _
5.0 SMDTG02680VA00_ _ _ _
6.0 SMDTG02680XA00_ _ _ _
5.0 SMDTG03100VA00_ _ _ _
6.0 SMDTG03100XA00_ _ _ _
5.0 SMDTG03150VA00_ _ _ _
6.0 SMDTG03150XA00_ _ _ _
6.0 SMDTG03220XA00_ _ _ _
6.0 SMDTG03330XA00_ _ _ _
7.0 SMDTG03470YA00_ _ _ _
4030
5040
5040
5040
5040
6054
6054
6054
5.0 SMDTJ02150VA00_ _ _ _
6.0 SMDTJ02220XA00_ _ _ _
6.0 SMDTJ02330XA00_ _ _ _
6.0 SMDTJ02470XA00_ _ _ _
6.0 SMDTJ02680XA00_ _ _ _
7.0 SMDTJ03100YA00_ _ _ _
7.0 SMDTJ03150YA00_ _ _ _
7.0 SMDTJ03220YA00_ _ _ _
Size
code
1000 VDC/400 VAC*
H
Part number
± 0.3
5040
5040
5040
6054
6.0 SMDTO12150XA00_ _ _ _
6.0 SMDTO12220XA00_ _ _ _
6.0 SMDTO12330XA00_ _ _ _
7.0 SMDTO12470YA00_ _ _ _
0.15 „
0.22
0.33
0.47
* AC voltage: f = 50 Hz; 1.4 x U
rms
+ UDC
U
r
*
Version according to catalogue 2013 still available
Solder pad recommendation
H
d
W
b
a
Part number completion:
Tolerance:
Packing:
Pin length:
20 % = M
10 % = K
5%=J
bulk = S
none = 00
Dims. in mm.
L
c
d
Bonding slit
Taped version see page 147.
Size
code
1812
2220
2824
4030
5040
6054
04.18
L
W
±0.3 ±0.3
d
a
b
c
min. min. max.
1.2
1.2
1.2
2.5
2.5
2.5
3.5 3.5
4
4.5
4
6.5
6
9
6 11.5
6 14
4.8 3.3 0.5
5.7 5.1 0.5
7.2 6.1 0.5
10.2 7.6 0.5
12.7 10.2 0.7
15.3 13.7 0.7
Rights reserved to amend design data without prior notification.
19
D
Recommendation for Processing
and Application of SMD Capacitors
Layout Form
The components can generally be
positioned on the carrier material as
desired. In order to prevent soldering
shadows or ensure regular temperature
distribution, extreme concentration of the
components should be avoided. In prac-
tice, it has proven best to keep a
minimum distance of the soldering
surfaces between two WIMA SMDs of
twice the height of the components.
Soldering Process
Re-flow soldering
Solder Pad Recommendation
H
d
W
b
a
L
c
d
Bonding slit
Size
code
1812
2220
2824
4030
5040
6054
L
± 0.3
4.8
5.7
7.2
10.2
12.7
15.3
W
± 0.3
3.3
5.1
6.1
7.6
10.2
13.7
d
0.5
0.5
0.5
0.5
0.7
0.7
a
b
c
min. min. max.
1.2 3.5 3.5
1.2 4
4.5
1.2 4
6.5
2.5 6
9
2.5 6 11.5
2.5 6 14
Temperature/time graph for the permissible processing temperature of the
WIMA SMD film capacitor for typical convection soldering processes.
Due to versatile procedures exact pro-
cessing parameters for re-flow soldering
processes cannot be specified. The graph
depicted is to be understood as a recom-
mendation to help establishing a suitable
soldering profile fulfilling the requirements
in practice at the user. During processing
a max. temperature of T=210° C inside the
component should not be exceeded. Due
to the differing heat absorption the length
of the soldering process should be kept as
short as possible for smaller size codes.
The solder pad size recommendations
given for each individual series are to be
understood as minimum dimensions which
can at any time be adjusted to the layout
form.
SMD Handsoldering
WIMA SMD capacitors with plastic
film dielectric are generally suitable for
hand-soldering, e. g. for lab purposes, with
a soldering iron where, however, similar to
automated soldering processes, a certain
duration and temperature should not be
exceeded. These parameters are dependent
on the physical size of the components and
the relevant heat absorption involved.
Size code
1812
2220
2824
4030
5040
6054
Temperature ° C / ° F
250 / 482
250 / 482
260 / 500
260 / 500
260 / 500
260 / 500
The below data are to be regarded as
guideline values and should serve to avoid
damage to the dielectric caused by exces-
sive heat during the soldering process. The
soldering quality depends on the tool used
and on the skill and experience of the per-
son with the soldering iron in hand.
Processing
The processing of SMD components
– assembling
– soldering
– electrical final inspection/calibrating
must be regarded as a complete process.
The soldering of the printed circuit board,
for example, can constitute considerable
stress on all the electronic components.
The manufacturer‘s instructions on the pro-
cessing of the components are mandatory.
Time duration
2 sec plate 1
3 sec plate 1
3 sec plate 1
5 sec plate 1
5 sec plate 1
5 sec plate 1
/
/
/
/
/
/
5
5
5
5
5
5
sec
sec
sec
sec
sec
sec
off
off
off
off
off
off
/
/
/
/
/
/
2
3
3
5
5
5
sec
sec
sec
sec
sec
sec
plate
plate
plate
plate
plate
plate
2
2
2
2
2
2
04.18
13
D
Recommendation for Processing
and Application of SMD Capacitors
(Continuation)
Solder Paste
To achieve reliable soldering results one of
the following solder alloys have from case
to case proven being workable:
Lead free solder paste
Sn - Bi
Sn - Zn (Bi)
Sn - Ag - Cu (suitable for SMD-PET 5040/
6054, SMD-PEN and SMD-PPS)
Solder paste with lead
Sn - Pb - Ag (Sn60-Pb40-A, Sn63-Pb37-A)
advisable to prolong the storage time to
t
10 days
In this way ageing effects of the capacitor
structure can be anticipated. Parameter
changes due to processing are not to be
expected after this period of time
number of other outstanding qualities:
favourable pulse rise time
low ESR
low dielectric absorption
available in high voltage series
large capacitance spectrum
stand up to high mechanical
stress
good long-term stability
As regards technical performance as well
as quality and reliability, the WIMA
SMD series offer the possibility to cover
nearly all applications of conventionally
through-hole film capacitors with SMD
components. Furthermore, the WIMA SMD
series can now be used for all the deman-
ding capacitor applications for which, in
the past, the use of through-hole compo-
nents was mandatory:
measuring techniques
oscillator circuits
differentiating and integrating
circuits
A/D or D/A transformers
sample and hold circuits
automotive electronics
With the WIMA SMD programme avai-
lable today, the major part of all plastic
film capacitors can be replaced by WIMA
SMD components. The field of application
ranges from standard coupling capacitors
to use in switch-mode power supplies as
filter or charging capacitors with high vol-
tage and capacitance values, as well as
in telecommunications e.g. the well-known
telephone capacitor 1
m
F/250VDC.
Humidity Protection Bags
Taped WIMA SMD capacitors are shipped
in humidity protection bags according to
JEDEC standard (ESD/EMI-shield/water-
vapour proof).
Under controlled conditions the compo-
nents can be stored two years and more
in the originally sealed bag. Opened
packing units should immediately be used
up for processing. If storage is necessary
the opened packing units should be stored
air-tight in the original plastic bag.
Washing
WIMA SMD components with plastic
encapsulation - like all other components
of similar construction irrespective of the
make - cannot be regarded as herme-
tically sealed. Due to today’s common
washing substances, e. g. on aqueous
basis instead of the formerly used halo-
genated hydrocarbons, with enhanced
washing efficiency it became obvious that
assembled SMD capacitors may show an
impermissibly high deviation of the electri-
cal parameters after a corresponding
washing process. Hence it is recommended
to refrain from applying industrial washing
processes for WIMA SMD capacitors in
order to avoid possible damages.
Reliability
Taking account of the manufacturer‘s
guidelines and compatible processing,
the WIMA SMD stand out for the same
high quality and reliability as the
analogous through-hole WIMA series. The
technology of metallized film capacitors
used e.g. in WIMA SMD-PET achieves
the best values for all fields of application.
The expected value is about:
Û
0
2 fit
Furthermore the production of all WIMA
components is subject to the regulations
laid down by ISO 9001:2008 as well
as the guidelines for component specifi-
cations set out by IEC quality assessment
system (IECQ) for electronic components.
Initial Operation/Calibration
Due to the stress which the components
are subjected to during processing, reversi-
ble parameter changes occur in almost all
electronic components. The capacitance
recovery accuracy to be expected with
careful processing is within a scope
of
DC/C
5 %.
For the initial operation of the device a
minimum storage time of
t
24 hours
is to be taken into account. With cali-
brated devices or when the application
is largely dependent on capacitance it is
Electrical Characteristics and
Fields of Application
Basically the WIMA SMD series have the
same electrical characteristics as the ana-
logous through-hole WIMA capacitors.
Compared to ceramic or tantalum
dielectrics WIMA SMD capacitors have a
04.18
14
查看更多>
热门器件
热门资源推荐
器件捷径:
S0 S1 S2 S3 S4 S5 S6 S7 S8 S9 SA SB SC SD SE SF SG SH SI SJ SK SL SM SN SO SP SQ SR SS ST SU SV SW SX SY SZ T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 TA TB TC TD TE TF TG TH TI TJ TK TL TM TN TO TP TQ TR TS TT TU TV TW TX TY TZ U0 U1 U2 U3 U4 U6 U7 U8 UA UB UC UD UE UF UG UH UI UJ UK UL UM UN UP UQ UR US UT UU UV UW UX UZ V0 V1 V2 V3 V4 V5 V6 V7 V8 V9 VA VB VC VD VE VF VG VH VI VJ VK VL VM VN VO VP VQ VR VS VT VU VV VW VX VY VZ W0 W1 W2 W3 W4 W5 W6 W7 W8 W9 WA WB WC WD WE WF WG WH WI WJ WK WL WM WN WO WP WR WS WT WU WV WW WY X0 X1 X2 X3 X4 X5 X7 X8 X9 XA XB XC XD XE XF XG XH XK XL XM XN XO XP XQ XR XS XT XU XV XW XX XY XZ Y0 Y1 Y2 Y4 Y5 Y6 Y9 YA YB YC YD YE YF YG YH YK YL YM YN YP YQ YR YS YT YX Z0 Z1 Z2 Z3 Z4 Z5 Z6 Z8 ZA ZB ZC ZD ZE ZF ZG ZH ZJ ZL ZM ZN ZP ZR ZS ZT ZU ZV ZW ZX ZY
需要登录后才可以下载。
登录取消