SPECIFICATION
Surface Acoustic Wave Filter
USER
USER PART No.
WISOL PART No.
SFXG35BYN02
DOC. No.
SMS-51-L-SFT-FS-48
DATE
Arp 18 , 2017
REVISION
001
WISOL
Lee, Ju-Hyeong
Hong, Sang-Dae
Byun, Kyung-Su
ISSUED
APPROVED
APPROVED
BY
BY (R&D)
BY (QC)
User
ISSUED
CHECKED
APPROVED
BY
BY
BY
WISOL CO., LTD.
531-7, Gajang-ro, Osan-si,
Gyeonggi-do, KOREA, 18103
http://www.wisol.co.kr
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
A TABLE OF CONTENTS
1. REVISION HISTORY ..................................................................................................................................... 3
2. DEFINITION .................................................................................................................................................. 4
3. PRECAUTIONS ............................................................................................................................................. 4
4. OUTLINE DRAWING & DIMENSIONS.......................................................................................................... 5
5. MARKING ...................................................................................................................................................... 6
6. PERFORMANCE ........................................................................................................................................... 7
6-1. MAXIMUM RATINGS .......................................................................................................................... 7
6-2. ELECTRICAL CHARACTERISTICS ................................................................................................... 8
7. RELIABILITY ............................................................................................................................................... 14
7-1. ENGINEERING SAMPLE FLOW CHART ......................................................................................... 14
7-2. TEST ITEM & CONDITION ............................................................................................................... 15
8. REFLOW CONDITION ................................................................................................................................ 16
9. RECOMMENDED PCB DIMENSIONS ....................................................................................................... 16
10. CAUTION ................................................................................................................................................... 17
11. PACKING ................................................................................................................................................... 18
11-1. DIMENSIONS.................................................................................................................................. 18
11-2. REELING QUANTITY ..................................................................................................................... 19
11-3. TAPING STRUCTURE .................................................................................................................... 19
11-4. INNER BOX(Reel Packing) STRUCTURE ...................................................................................... 20
11-5. OUTER BOX STRUCTURE ............................................................................................................ 21
12. TAPE SPECIFICATIONS .......................................................................................................................... 22
13. RoHS DATA ............................................................................................................................................... 23
SMS-51-L-SFT-FS-48
Page 2/29
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
1. REVISION HISTORY
000 Jau 11 2017
All Page
001 Apr.18. 2017
8-9/29Page Changed Wi-Fi frequency range
SMS-51-L-SFT-FS-48
Make specification
Page 3/29
Apr. 18, 2017
Surface Acoustic Wave Filter
SFXG35BYN02
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
2. DEFINITION
2-1. PART No.
S F X G35 B YN 0 2
① ②
③
④
⑤
No.
⑥
EXPLANATION
①
SAW Filter
②
Design Type
③
Center Frequency:
④
Input/Output 50ohm/50ohm,
⑤
Package size: 1.8×1.4mm²
⑥
Design Revision (02 : Molding Type)
Tx
2535MHz (2500 ~ 2570MHz)
2-2. APPLICATION : UMTS B8
3. PRECAUTIONS
3-1. This device should not be used in any type of fluid such as water, oil, organic solvent, etc.
3-2. This is a hermetic device.
MSL(Moisture Sensitive Level) is the '2a' level.
3-3. Ultrasonic cleaning shall be avoided.
3-4. Isopropyl Alcohol and Ethyl Alcohol can be used for cleaning. Contact us before using other
cleaning solvents than above
3-5. This is an electrostatic sensitive device.
Please avoid static voltage during operation and storage.
3-6. Sudden change of temperature shall be avoided, deterioration of the characteristics can
occur.
3-7. If any malfunction due to designing or manufacturing which is out of specification occurs
within one year after the products have been delivered, the maker should exchange the
defective products.
SMS-51-L-SFT-FS-48
Page 4/29
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
4. OUTLINE DRAWING & DIMENSIONS
[Unit: mm]
Nt
O
XX
X
SMS-51-L-SFT-FS-48
Page 5/29
No.
Function
1
Rx Output
3
Tx Input
6
Antenna
2, 4, 5, 7, 8
GND
Apr. 18, 2017
Surface Acoustic Wave Filter
SFXG35BYN02
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
5. MARKING
N t X X
○
X
5-1. N t
XX
- The 1st, 2nd character 'N t' indicates the model name of SAW Filter“SFXG35BYN02”.
- The 3rd character 'X' indicates the year and the month of manufacture.
Year
Month
1
2
3
4
5
6
7
8
9
10 11
12
2014
1
2
3
4
5
6
7
8
9
A
B
C
2015
D
E
F
G
H
I
J
K
L
M
N
O
2016
P
Q
R
S
T
U
V
W
X
Y
Z
a
2017
1
2
3
4
5
6
7
8
9
A
B
C
※ This rotates by the 3 years.
- The
4th, 5th
character 'X' indicates Lot No.
5-2. O
- This symbol indicates input pin 1.
- This indicates the producing center
○ : China,
5-3. Marking : Laser Marking
SMS-51-L-SFT-FS-48
Page 6/29
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
6. PERFORMANCE
6-1. MAXIMUM RATINGS
CHARACTERISTICS
RATINGS
UNITS
DC Permissive Voltage
5
V
Maximum Input Power
0.8
W
Operating Temperature Range
-20 ~ +85
℃
Storage Temperature Range
-40 ~ +85
℃
SMS-51-L-SFT-FS-48
Page 7/29
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
6-2. ELECTRICAL CHARACTERISTICS
6-2-1. TABLE
Ta = -20 ~ +85℃
Item
RATING
CONDITION
[MHz]
UNIT
Min.
Typ.(25℃)
Max.
TX ANTENNA
2500 ~ 2570(*1)
dB
-
1.95
2.9
2500 ~ 2570(*1)(*2)
dB
-
1.95
2.7
2500 ~ 2570
dB
-
1.0
2.1
2500 ~ 2570(*2)
dB
-
1.0
1.9
2500 ~ 2570
-
-
1.7
2.5
10 ~718
dB
30
55
-
832 ~ 862
dB
30
53
-
1559 ~ 1563
dB
30
40
-
1565.42 ~ 1605.89
dB
30
40
-
1605.89 ~ 1680.0
dB
30
40
-
1710.0 ~ 1785.0
dB
30
38
-
1805.0 ~ 1880.0
dB
30
37
-
1900.0 ~ 1920.0
dB
30
37
-
2010.0 ~ 2025.0
dB
28
36
-
2110.0 ~ 2170.0
dB
28
36
-
2401.0 ~ 2468.0(*3)
dBINT
40
46
-
2451.0 ~ 2473.0(*3)
dBINT
30
58
-
2456.0 ~ 2478.0(*3)
dBINT
15
50
-
2461.0 ~ 2483.0(*3)
dBINT
7
40
-
2590.0 ~ 2595.0
dB
1.3
4
-
2595.0 ~ 2620.0
dB
2
7
-
2620.0 ~ 2690.0
dB
45
54
-
5000.0 ~ 5140.0
dB
30
50
-
5100.0 ~ 5280.0
dB
30
52
-
Insertion Loss
Inband Ripple
VSWR
Absolute
Attenuation
Termination Impedance : INPUT / ANTENNA
50Ω(+2.4nH) / 50Ω(// 3.3nH)
ANTENNA RX
2620 ~ 2690(*1)
dB
-
1.9
3.1
2620 ~ 2690(*1)(*2)
dB
-
1.9
2.9
Insertion Loss
SMS-51-L-SFT-FS-48
Page 8/29
Apr. 18, 2017
Surface Acoustic Wave Filter
SFXG35BYN02
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
2620 ~ 2690
dB
-
0.8
2.1
2620 ~ 2690(*2)
dB
-
0.8
1.9
2620 ~ 2690
-
-
1.8
2.5
1.0 ~ 2500.0
dB
35
46
-
2402.0 ~ 2470.0
dB
40
53
-
2500.0 ~ 2570.0
dB
45
51
-
2570.0 ~ 2600.0
dB
2.5
9
-
4900.0 ~ 5950.0
dB
20
35
-
Inband Ripple
VSWR
Absolute
Attenuation
Termination Impedance : ANTENNA / OUTPUT
50Ω (//3.3nH) /50Ω(//5.1nH)
TX → RX
Isolation
between Rx and
Tx
2500 ~ 2570
dB
52
56
-
2620 ~ 2690
dB
50
54
-
(*1). PCB loss is de-embedded.
(*2)Valid at room temperature.
(*3)Integrated attenuation per 18MHz over
6-2-2. TEST FIXTURE
50Ω
3.3nH
50Ω
5.1nH
Antenna
Nt X X
○
X
Rx Output
SMS-51-L-SFT-FS-48
2.4nH
50Ω
Tx Input
Page 9/29
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
6-2-3. GRAPH
6-2-3-1. Tx→Ant, Ant→Rx Transmission Characteristics
NEAR BAND
0
0
-10
-1
-20
-2
-30
-3
-40
-4
-50
-5
-60
-6
-70
-7
-80
2400
2500
2600
Frequency (MHz)
2700
-8
2800
6-2-3-2. Tx→Rx Isolation Characteristics
Isolation
0
-10
-20
-30
-40
-50
-60
-70
-80
2400
SMS-51-L-SFT-FS-48
2500
2600
Frequency (MHz)
Page 10/29
2700
2800
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
6-2-3-3. Wideband Tx→Ant, Ant→Rx Transmission Characteristics
Wide TX
0
-10
-20
-30
-40
-50
-60
-70
-80
0
1000
2000
3000
4000
Frequency (MHz)
5000
6000
5000
6000
Wide RX
0
-10
-20
-30
-40
-50
-60
-70
-80
0
SMS-51-L-SFT-FS-48
1000
2000
3000
4000
Frequency (MHz)
Page 11/29
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
6-2-3-4. Wideband Tx→Rx Transmission Characteristics
Wide Isolation
0
-10
-20
-30
-40
-50
-60
-70
-80
0
1000
2000
3000
4000
Frequency (MHz)
5000
6000
6-2-3-5. Smithchart
Swp Max
2690MHz
2.
9
0.
3.
0
8
4
4.
0
5.0
0.2
10.0
5.0
4.0
3.0
2.0
1.0
0.8
0.6
0.4
0.2
10.0
0
ANT VSWR
10
0
0.
6
0.8
1.0
ANT Smith
7
6
5
4
-10.0
3
2
0
.0
.0
SMS-51-L-SFT-FS-48
-1.0
-0.8
-0
.6
-2
.0
-3
4
-4
.
-0
-5.
-0.
2
1
2400
Swp Min
2500MHz
Page 12/29
2500
2600
Frequency (MHz)
2700
2800
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
Swp Max
2570MHz
2.
9
0.
0
3.
8
4
4.
0
5.0
0.2
10.0
5.0
4.0
3.0
2.0
1.0
0.8
0.6
0.4
0.2
10.0
0
TX VSWR
10
0
0.
6
0.8
1.0
TX Smith
7
6
5
4
-10.0
3
2
0
-4
.0
-3
.0
-2
2450
2500
Swp Min
2500MHz
-1.0
-0.8
.6
-0
2
1
2400
.0
-
4
0.
-5.
-0.
2550
2600
Frequency (MHz)
2650
2700
2750
2800
Swp Max
2690MHz
2.
9
0.
3.
0
8
4
4.
0
5.0
0.2
10.0
5.0
4.0
3.0
2.0
1.0
0.8
0.6
0.4
0.2
10.0
0
RX VSWR
10
0
0.
6
0.8
1.0
RX Smith
7
6
5
4
-10.0
3
2
0
.0
.0
SMS-51-L-SFT-FS-48
-1.0
-0.8
-0
.6
-2
.0
-3
4
-4
.
-0
-5.
-0.
2
1
2500
Swp Min
2620MHz
Page 13/29
2550
2600
2650
2700
Frequency (MHz)
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
7. RELIABILITY
7-1. ENGINEERING SAMPLE FLOW CHART
Initial Characteristics
Electrical Parametric Data@25℃
Preconditioning (MSL 2a)
(JESD22-A113)
(n=191)
HTS
(n=23)
ESD(HBM)
(n=9)
Board Level Drop
(n=11)
LTS
(n=23)
ESD(HBM) LIMIT
(n=3)
Bending
(n=11)
uHAST
(n=23)
ESD(MM)
(n=9)
Solder Heat
(n=11)
THS
(n=23)
ESD(CDM)
(n=6)
Solderability
(n=11)
Temp. Drift
(n=5)
TC
(n=23)
Final Electrical Data
(n=115)
SMS-51-L-SFT-FS-48
Final Electrical Data
(n=27)
Page 14/29
Final Electrical Data
(n=49)
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
7-2. TEST ITEM & CONDITION
CATEGORY
TEST ITEM
Preconditioning
TEST CONDITION
REMARK
Bake + Soak(MSL or above) + 3X Reflow
duration ( Soak 60℃ 60% 120HR)
JESD22-A113
TEST ITEM
REMARK
TEST CONDITION
Duration
HTS (High Temperature Storage)
JESD22-A103
condition A 125(-0/+10)℃
1000hr
LTS (Low Temperature Storage)
JESD22-A119
A -40(-10/+0)℃
1000hr
uHAST (Unbiased HAST)
JESD22-A118
130℃ /85% /33.3psi
96hr
JESD22-A101
85℃ /85% RH
1000hr
TC (Temperature Cycle)
JESD22-A104
Condition G (-40℃ /125℃)
1000cycle
ESD(HBM)
JESD22-A114
250V or above
-
ESD(HBM) LIMIT
-
300V or above
-
ESD(MM)
JESD22-A115
No spec butneed data
-
ESD(CDM)
JESD22-C101
500V or above
-
Board Level Drop Test
JESD22-B111
1500G Duration 0.5ms
150cycle
THS (Temperature Humidity
Storage)
Bending
Test
0.5㎜/sec 3times (1mm distance)
Solder Heat Resistance
260℃
10sec
Solderability
235℃
3sec
Temp Drift
SMS-51-L-SFT-FS-48
-40℃
Page 15/29
→
+25℃ →
+125℃
Per conditions
2HR
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
8. REFLOW CONDITION
9. RECOMMENDED PCB DIMENSIONS
[UNIT : mm]
[SAW, X-ray Top View]
SMS-51-L-SFT-FS-48
[PCB, X-ray Top View]
Page 16/29
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
10. CAUTION
Moisture Sensitivity Device Caution (MSL LEVEL=2a)
1. Calculated shelf life in sealed bag : 12 month at 〈40℃ and 〈90% relative Humidity(RH)
2. Peak package body temperature : 260℃
3. After bag is opened, devices that will be subjected to reflow solder or other high
temperature process must be
(a) Mounted within : 672 hours of factory conditions ≤30℃/60% RH, or
(b) Stored per J-STD-033
4. Device require bake, before mounting, if :
(a) Humidity Indicator Card reads 〉60% when read at 23±5℃
(b) 3(a) or 3(b) are not met
5. If baking is required, refer to IPC/JEDEC J-STD-033 for bake procedure
Note : Level and body temperature defined by IPC/JEDEC J-STD-020
Aluminum Pack (310mmΧ370mm)
HIC(Humidity Indication Card)
10 to 60% RH
SMS-51-L-SFT-FS-48
Page 17/29
Apr. 18, 2017
Surface Acoustic Wave Filter
SFXG35BYN02
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
11. PACKING
11-1. DIMENSIONS
- Carrier Tape
[Unit: mm]
A
B
D0
D1
E
F
P0
P1
P2
t1
t2
W
1.60
2.00
Ø1.55
Ø1.00
1.75
3.50
4.00
4.00
2.00
0.25
0.80
8.00
0.05
0.05
0.05
MIN
0.10
0.05
0.10
0.10
0.05
0.05
0.05
0.10
-0.05
-0.05
-0.05
-
-0.10
-0.05
-0.10
-0.10
-0.05
-0.05
-0.05
-0.10
- Reel
[Unit: mm]
A
B
C
D
E
F
G
H
t1
t2
W
Ø258.0
+1.0
-0.5
Ø81.0
+1.0
-1.0
Ø13.0
+0.5
-0.5
50.0
+0.8
-0.8
2.2
+0.3
-0.3
7.0
+0.5
-0.5
30.0
+0.8
-0.8
35.0
+1.0
-1.0
1.8
+0.5
-0.5
1.5
+0.5
-0.5
9.0
+1.0
-0.5
- The product shall be packed properly not to damaged during transportation and storage.
SMS-51-L-SFT-FS-48
Page 18/29
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
11-2. REELING QUANTITY
10 inch reel : 8,000 pcs/reel
11-3. TAPING STRUCTURE
11-3-1. The tape shall be wound around the reel in direction shown below.
Nt XX
O
X
Nt XX
O
X
11-3-2. BAR CODE LABEL
SMS-51-L-SFT-FS-48
①
MODEL NAME BARCODE
② SFH836AQ101
Model Name
③ RLYC12563
Reel number
④ 8000 / qAFYU
Quantity / Marking
Page 19/29
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
1-3-3. Leader part and vacant position specifications.
11-4. INNER BOX(Reel Packing) STRUCTURE
Material:
Polycarbonate
Material:
Polyethylene + Aluminium
Size:
310×370mm2
Material:
Size:
Paper
(D)260×(W)37×(H)265mm3
SMS-51-L-SFT-FS-48
Page 20/29
Apr. 18, 2017
.
.
Surface Acoustic Wave Filter
SFXG35BYN02
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
11-5. OUTER BOX STRUCTURE
Material : Paper
TYPE
A
SIZE(mm)
a
b
c
Inner Box
#
270
240
275
6 boxes
SIDE ①
SIDE ②
MODEL
Q'TY
EA
USER
DATE
.
.
- SIDE is the same as front side.
SMS-51-L-SFT-FS-48
Page 21/29
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
12. TAPE SPECIFICATIONS
12-1. Tensile Strength of Carrier Tape: 4.4N/mm width
12-2. Top Cover Tape Adhesion (See the below figure)
- pull of angle: 0~15 degree
- speed:
300mm/min.
- force:
20~70g
SMS-51-L-SFT-FS-48
Page 22/29
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Version:
Preliminary
13. RoHS DATA
SMS-51-L-SFT-FS-48
Page 23/29
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SMS-51-L-SFT-FS-48
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Page 24/29
Version:
Preliminary
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SMS-51-L-SFT-FS-48
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Page 25/29
Version:
Preliminary
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SMS-51-L-SFT-FS-48
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Page 26/29
Version:
Preliminary
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SMS-51-L-SFT-FS-48
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Page 27/29
Version:
Preliminary
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SMS-51-L-SFT-FS-48
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Page 28/29
Version:
Preliminary
Apr. 18, 2017
Surface Acoustic Wave Filter
B7 DPX-Tx 2535MHz
B7 DPX-Rx 2655MHz
SMS-51-L-SFT-FS-48
SFXG35BYN02
1.8×1.4×0.55mm3 8pin lay-out
Page 29/29
Version:
Preliminary
Apr. 18, 2017