RClamp1851ZA Datasheet

RClamp1851ZA
Ultra Small RClamp®
1-Line, 18V ESD Protection
PROTECTION PRODUCTS - RailClamp®
Description
Features
RClamp® TVS diodes are designed to protect sensitive
electronics from damage or latch-up due to ESD. They
are designed to replace multilayer varistors (MLVs) in
portable applications such as cell phones, notebook
computers, and other portable electronics. This device
offers desirable characteristics for board level protection
including fast response time, low operating and clamping voltage, and no device degradation.
‹‹ High ESD withstand Voltage: +/-17kV (Contact) and
+/- 20kV (Air) per IEC 61000-4-2
‹‹ Ultra-small package
‹‹ Protects one high speed data line
‹‹ Low ESD clamping voltage
‹‹ Working voltage: 18V
‹‹ Low capacitance: 0.35pF typical
‹‹ Low leakage current
‹‹ Extremely low dynamic resistance: 0.16 Ohms (Typ)
‹‹ Solid-state silicon-avalanche technology
RClamp®1851ZA is specifically designed for protection of
Near Field Communications (NFC) interfaces. It features
extremely good ESD protection characteristics including a low typical dynamic resistance of 0.16 Ohms, low
peak ESD clamping voltage, and high ESD withstand
voltage (+/-17kV contact per IEC 61000-4-2). Low typical capacitance (0.35pF at VR=0V) means that harmonic distortion the the RF signal is minimized. This device
is bidirectional and has a working voltage of 18V for use
on NFC resonator circuits without signal clipping.
Mechanical Characteristics
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RClamp1851ZA is in a 2-pin SLP0603P2X3F package
measuring 0.6 x 0.3 mm with a nominal height of only
0.25mm. Leads are finished with NiAu. The small package gives the designer the flexibility to protect single
lines in applications where arrays are not practical. The
combination of small size and high ESD surge capability
makes them ideal for use in portable applications such
as cellular phones, digital cameras, and tablet PC’s.
Applications
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Package Dimensions
Near Field Communication (NFC) lines
RF signal lines
Cellular Handsets
Tablets
FM Antenna
Schematic & Pin Configuration
0.600
0.220
SLP0603P2X3F package
Pb-Free, Halogen Free, RoHS/WEEE Compliant
Nominal Dimensions: 0.6 x 0.3 x 0.25 mm
Lead Finish: NiAu
Marking: Marking code
Packaging: Tape and Reel
1
0.300
0.160
0.355 BSC
2
0.250
Nominal Dimensions in mm
4/15/2015
SLP0603P2X3F (Bottom View)
1
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RClamp1851ZA
PROTECTION PRODUCTS
Absolute Maximum Ratings
Rating
Symbol
Value
Units
IPP
3
A
VESD
±20
±17
kV
TJ
-40 to +85
O
TSTG
-55 to +150
O
Peak Pulse Current (tp = 8/20µs)
ESD per IEC 61000-4-2 (Air)
ESD per IEC 61000-4-2 (Contact)(1)
(1)
Operating Temperature
Storage Temperature
C
C
Electrical Characteristics (T=25OC unless otherwise specified)
Parameter
Symbol
Conditions
Reverse Stand-Off Voltage
VRWM
T = -40 to +85OC
Breakdown Voltage
VBR
IBR = 10µA
Reverse Leakage Current
IR
ESD Clamping Voltage2
Min.
Max.
Units
18
V
22.5
26.5
V
VRWM = 18V
<1
50
nA
VC
IPP = 4A
tp = 0.2/100ns
5.5
V
ESD Clamping Voltage2
VC
IPP = 16A
tp = 0.2/100ns
7.5
V
Dynamic Resistance2, 3
RDYN
tp = 0.2/100ns
0.16
Ohms
Junction Capacitance
CJ
VR = 0V; f = 1MHz
0.35
18.5
Typ.
0.45
pF
Notes
1)Measured with a 40dB attenuator, 50 Ohm scope input impedance, 2GHz bandwidth. ESD gun return path connected to ESD ground plane.
2)Transmission Line Pulse Test (TLP) Settings: tp = 100ns, tr = 0.2ns, ITLP and V TLP averaging window: t1 = 70ns to t2 = 90ns.
3)Dynamic resistance calculated from ITLP = 4A to ITLP = 16A
4)Device is electrically symmetrical
 2015 Semtech Corporation.
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RClamp1851ZA
PROTECTION PRODUCTS
Typical Characteristics
ESD Clamping (8kV Contact per IEC 61000-4-2)
100
10
Measured with 50 Ohm scope input
impedance, 2GHz bandwidth. Corrected
for 50 Ohm, 40dB attenuator. ESD gun
return path connected to ESD ground plane.
90
80
0
-10
70
Clamping Voltage - VC (V)
Clamping Voltage - VC (V)
ESD Clamping (-8kV Contact per IEC 61000-4-2)
60
50
40
30
20
-20
-30
-40
-50
-60
10
-70
0
-80
-10
-10
0
10
20
30
40
50
60
70
-90
80
Measured with 50 Ohm scope input
impedance, 2GHz bandwidth. Corrected
for 50 Ohm, 40dB attenuator. ESD gun
return path connected to ESD ground plane.
-10
0
10
20
30
40
Time (ns)
Time (ns)
TLP Characteristic (Positive Pulse)
30
-5
10
5
-10
-15
-20
Transmission Line Pulse Test
(TLP) Settings:
tp = 100ns, tr = 0.2ns,
ITLP and VTLP averaging window:
t1 = 70ns to t2 = 90ns
-25
0
-30
0
5
10
15
20
-35
25
-25
Clamping Voltage (V)
-15
-10
-5
0
Insertion Loss - S21 (dB)
0
0.8
‐0.5
0.7
‐1
0.6
‐1.5
Insertion Loss ‐ IL (dB)
Junction Capacitance - CJ (pF)
-20
Clamping Voltage (V)
Capacitance vs. Reverse Voltage
0.5
0.4
0.3
0.2
0.1
0
80
0
15
-5
70
5
TLP Current (A)
TLP Current (A)
20
60
TLP Characteristic (Negative Pulse)
Transmission Line Pulse Test
(TLP) Settings:
tp = 100ns, tr = 0.2ns,
ITLP and VTLP averaging window:
t1 = 70ns to t2 = 90ns
25
50
‐2
‐2.5
‐3
‐3.5
‐4
‐4.5
f = 1MHz
0
4
8
12
16
‐5
20
0
Voltage (V)
 2015 Semtech Corporation.
3
1
Frequency (GHz)
10
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RClamp1851ZA
PROTECTION PRODUCTS
Applications Information
ESD Protection of NFC Interfaces
The Near Field Communication (NFC) antenna is usually
connected to the NFC controller IC via contact points on
the phone. These contact points are user accessable
and therefore may be subjected to ESD strikes. External
protection (TVS) devices should be placed between the
antenna and the NFC chip interface. The working voltage of the TVS should be high enough as not to clip the
NFC signal. Additionaly, the capacitance of the device
RX+
should be minimized in order to avoid harmonic disctortion of the RF signal. RClamp1851ZA meets these
requirements and also features extremely low dynamic
resistance resulting in low ESD clamping voltage. The
low dynamic resistance also helps insure protection for
Schottky diodes that may be used in the NFC circuit.
RClamp1851ZA is designed to work on NFC circuits with
AC signals as high as 18V. An example protection ciruit
is shown below in Figure 1.
RX-
TX+
EMI Filter
Ckt
Antenna
Matching
Ckt
Antenna+
RClamp1851ZA
GND
NFC
Controller
RClamp1851ZA
TX-
EMI Filter
Ckt
Antenna
Matching
Ckt
Antenna-
REC
R
C
Figure 1 - NFC Protection Example
 2015 Semtech Corporation.
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RClamp1851ZA
PROTECTION PRODUCTS
Applications Information
Assembly Guidelines
The small size of this device means that some care must
be taken during the mounting process to insure reliable
solder joint. The table below provides Semtech’s recommended assembly guidelines for mounting this device.
The figure at the right details Semtech’s recommended
aperture based on the below recommendations. Note
that these are only recommendations and should serve
only as a starting point for design since there are many
factors that affect the assembly process. The exact
manufacturing parameters will require some experimentation to get the desired solder application.
Assembly Parameter
Laser cut, Electro-polished
Aperture shape
Rectangular with rounded
corners
Solder Paste Type
Solder Reflow Profile
PCB Solder Pad Design
PCB Pad Finish
 2015 Semtech Corporation.
0.175
0.272
Recommendation
Solder Stencil Design
Solder Stencil Thickness
Stencil Aperture
Mounting Pad
Package
0.250
0.298
0.270
Recommended Mounting Pattern
0.100 mm (0.004")
Type 4 size sphere or smaller
Per JEDEC J-STD-020
Non-Solder mask defined
OSP OR NiAu
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RClamp1851ZA
PROTECTION PRODUCTS
Outline Drawing - SLP0603P2X3F
A
B
D
DIM
A
A1
b
D
E
e
L
N
aaa
bbb
E
TOP VIEW
A
0.235 0.250 0.265
0.000 0.010 0.050
0.200 0.220 0.240
0.580 0.600 0.620
0.280 0.300 0.320
0.355 BSC
0.140 0.160 0.180
2
0.08
0.10
SEATING
PLANE
aaa C
C
A1
bbb
DIMENSIONS
MILLIMETERS
MIN NOM MAX
e/2
R0.025
TYP
bxN
C A B
2X L
e
BOTTOM VIEW
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
Land Pattern - SLP0603P2X3F
DIMENSIONS
DIM
G
X
Y
Z
Z
G
MILLIMETERS
0.177
0.272
0.247
0.671
Y
X
NOTES:
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
 2015 Semtech Corporation.
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RClamp1851ZA
PROTECTION PRODUCTS
Marking
Ordering Information
t
Part Number
Qty per Reel
Reel Size
RClamp1851ZATFT
15000
7”
Notes:
1) RailClamp and RClamp are trademarks of Semtech
Corporation.
Notes: Device is Electrically Symmetrical
Tape and Reel Specification
t
t
t
Contact Information
Semtech Corporation
Protection Products Division
200 Flynn Rd., Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
 2015 Semtech Corporation.
7
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