1www.semtech.com
RClamp®1521PQ
Ultra-Low Capacitance
1-Line ESD Protection
PROTECTION PRODUCTS - RailClamp®
Revised 3/15/2013
The RailClamp family is a series of ultra low capacitance
Transient Voltage Suppressors (TVS) designed to protect
high speed data interfaces. This series has been specifi -
cally designed to protect sensitive components which
are connected to high-speed data and transmission
lines from overvoltage caused by ESD (electrostatic dis-
charge), CDE (Cable Discharge Events), and EFT (electri-
cal fast transients).
The RClamp®1521PQ has a maximum capacitance of
only 0.5pF. This allows it to be used on circuits operat-
ing in excess of 3GHz without signal attenuation. They
may be used to meet the ESD immunity requirements of
IEC 61000-4-2, Level 4 (±15kV air, ±8kV contact dis-
charge).
The RClamp1521PQ is in a 2-pin, RoHS/WEEE compli-
ant, SLP1006P2 package measuring 1.0 x 0.6 x 0.5mm.
The leads are spaced at a pitch of 0.65mm and feature
a lead-free fi nish. Each device will protect one high-
speed line operating at 15 volts. It gives the designer
the fl exibility to protect single lines in applications where
arrays are not practical. The combination of small size,
low capacitance, and high ESD surge capability makes
them ideal for use in applications such as cellular
phones and high-power USB.
The RClamp1521PQ is qualifi ed to AEC-Q100 Grade 1
for Automotive use.
Transient protection for data lines to u
IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
IEC 61000-4-4 (EFT) 40A (tp = 5/50ns)
Cable Discharge Event (CDE)
Ultra-small package (1.0 x 0.6 x 0.5mm). u
Protects one data or I/O line. u
Low capacitance: 0.3pF typical. u
Low clamping voltage. u
Low operating voltage: 15V. u
Solid-state silicon-avalanche technology. u
AEC-Q100 Grade1 Qualifi ed. u
Description
Package Dimensions
Features
Applications
Schematic & Pin Confi guration
SLP1006P2 package. u
Molding compound fl ammability rating: UL 94V-0. u
Marking: Marking code. u
Packaging : Tape and Reel. u
Lead Finish: NiPdAu. u
RoHS/WEEE Compliant u
Cellular Handsets & Accessories. u
USB Ports. u
PCI Express. u
Serial ATA. u
Automotive Applications. u
Mechanical Characteristics
#1%-&-2%2
#7
7/-
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7-
#1%-&-2#2
2 2013 Semtech Corporation. www.semtech.com
RClamp1521PQ
PROTECTION PRODUCTS
Absolute Maximum Ratings
Electrical Characteristics (T=25OC unless otherwise specifi ed)
Parameter Symbol Conditions Min. Typ. Max. Units
Reverse Stand-Off Voltage VRWM T = -40 to +125°C 15 V
Reverse Breakdown Voltage VBR
It = 1mA
T = -40 to +125°C 16.7 V
Reverse Leakage Current IRVRWM = 15V,
T = 25°C 1
uA
T = 125°C 5
Clamping Voltage VCIPP = 1A, tp = 8/20µs 30 V
Clamping Voltage VCIPP = 4A, tp = 8/20µs 35 V
Junction Capacitance CJVR = 0V, f = 1MHz
T = 25°C 0.30 0.50 pF
T = 125°C 1.00
Rating Symbol Value Units
Peak Pulse Power (tp = 8/20µs) PPK 120 W
Peak Pulse Current (tp = 8/20µs) IPP 4 A
ESD per IEC 61000-4-2 (Air)
VESD
±15
kV
ESD per IEC 61000-4-2 (Contact) ±8
Operating Temperature TJ-40 to +125 OC
Storage Temperature TSTG -55 to +150 OC
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RClamp1521PQ
PROTECTION PRODUCTS
Typical Characteristics
Non-RepetitivePeak Pulse Power vs. Pulse Time Power Derating Curve
Reverse Leakage vs. Temperature Reverse Leakage vs. Reverse Voltage
Capacitance vs. Temperature
0.0
0.5
1.0
1.5
-50 0 50 100 150
Leakage Current - IR(uA)
Temperature (OC)
VR= 15V
AR_IRvT
0.0
0.5
1.0
1.5
2.0
2.5
-50 0 50 100 150
Junction Capacitance - CJ(pF)
Temperature (OC)
VR = 15V
VR = 0V
AR_CJvT
0.01
0.1
1
10
0.1 1 10 100 1000
Peak Pulse Power - PPP (kW)
Pulse Duration - tp (µs)
DR040412-120
TA= 25OC
0
20
40
60
80
100
120
0 25 50 75 100 125 150
% of Rated Power or IPP
Ambient Temperature - TA(OC)
DR040512:25:125:150
0.00
0.05
0.10
0.15
0.20
0 5 10 15
Leakage Current - IR(uA)
Reverse Voltage - VR(V)
TA= 25OC
AR_IRvV
18
19
20
21
22
-50 0 50 100 150
Breakdown Voltage - VBR (V)
Temperature (OC)
IR = 1mA
AR-BVvT
Breakdown Voltage vs. Temperature
4 2013 Semtech Corporation. www.semtech.com
RClamp1521PQ
PROTECTION PRODUCTS
Typical Characteristics (Continued)
-100
0
100
200
300
400
-20 0 20 40 60 80 100
Clamping Voltage - VC(V)
Time (ns)
T
A
= 25OC
Corrected for 40dB attenuation.
Measured with 50Ω, 40dB attenuator;
50Ω Scope Input Impedance.
AR_ESD POS
ESD Positive Clamp (8kV Contact per IEC 61000-4-2)
-400
-300
-200
-100
0
100
-20 0 20 40 60 80 100
Clamping Voltage - VC(V)
Time (ns)
AR_ESD NEG
TA= 25OC
Corrected for 40dB attenuation.
Measured with 50Ω, 40dB attenuator;
50Ω Scope Input Impedance.
ESD Negative Clamp (8kV Contact per IEC 61000-4-2)
0
10
20
30
0 10 20 30 40 50 60
TLP Current - IDUT (A)
Clamping Voltage - VC(V)
T
A
= 25OC
Typical Either Direction
AR_TLP_BI
RDYN = 1.07Ω
4A to 16A
TLP IV Curve (Typical Either Direction)
5
2013 Semtech Corporation. www.semtech.com
RClamp1521PQ
PROTECTION PRODUCTS
Applications Information
Device Connection Options
These low capacitance TVS diodes are designed to
provide common mode protection for one high-speed line
or differential protection for one line pair. The device is
bidirectional and may be used on lines where the signal
polarity is positive and negative.
Circuit Board Layout Recommendations for
Suppression of ESD.
Good circuit board layout is critical for the suppression
of ESD induced transients. The following guidelines are
recommended:
Place the TVS near the input terminals or connectors u
to restrict transient coupling.
Minimize the path length between the TVS and the u
protected line.
Minimize all conductive loops including power and u
ground loops.
The ESD transient return path to ground should be u
kept as short as possible.
Never run critical signals near board edges. u
Use ground planes whenever possible. u
#1%-&-2&2
Equivalent Circuit Diagram
6 2013 Semtech Corporation. www.semtech.com
RClamp1521PQ
PROTECTION PRODUCTS
Applications Information - Spice Model
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RClamp1521PQ Spice Model
RClamp1521PQ Spice Parameters
Parameter Unit D1 (LCRD) D2 (LCRD) D3 (TVS)
IS (A) 1.0E-20 1.0E-20 2.0E-12
BV (V) 100 100 19.5
VJ (V) 0.7 0.7 0.6
RS (Ohm) 0.458 0.89 0.8
IBV (A) 1E-3 1E-3 1E-3
CJO (F) 0.4E-12 0.4E-12 56E-12
TT (s) 2.541E-9 2.541E-9 2.541E-9
M -- 0.01 0.01 0.23
N -- 1.1 1.1 1.1
EG (eV) 1.11 1.11 1.11
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2013 Semtech Corporation. www.semtech.com
RClamp1521PQ
PROTECTION PRODUCTS
Outline Drawing - {Insert Package Type}
Land Pattern - {Insert Package Type}
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8 2013 Semtech Corporation. www.semtech.com
RClamp1521PQ
PROTECTION PRODUCTS
Marking
Tape and Reel Specifi cation
Ordering Information
Note: Lead fi nish is lead-free NiPdAu
RailClamp and RClamp are marks of Semtech Corporation.
Part Number Qty per Reel Reel Size
RClamp1521PQTCT 3000 7 Inch
#1%-&-2-2
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A0 B0 K0 B1 D D1 E F K P P0 P2 t W
0.69
±0.10
1.19
±0.10
0.66
±0.10
Not
Spec’d
1.50
+0.1
-0.0
Not
Spec’d
1.75
±0.10
3.50
±0.05
Not
Spec’d
4.00
±0.10
4.00
±0.10
2.00
±0.05
Not
Spec’d
8.0
+0.3
-0.1
Ref KCT00078 Rev0
#1%-&-2/2
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Contact Information
Semtech Corporation
Protection Products Division
200 Flynn Rd., Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
9
2013 Semtech Corporation. www.semtech.com
RClamp1521PQ
PROTECTION PRODUCTS
Date Description By
1/8/2013 Raised from PM Document RClamp1521P.pmd Rev 8/22/07 DJR
1/30/2013 Released to PLM as Preliminary DJR
2/1/2013 Corrected p1. date (was 2012); Added High temp. parameters to Electrical Characteristics table. DJR
3/1/2013 Changed 8/20 Clamping voltage. WAS 28V @ 1A; 30V @ 4A: IS 30V @ 1A; 35V @ 4A: Reason
necessary for yield. DJR
3/15/2013 Added ESD and TLP Curves, raised to Final; Released to PLM as Final DJR
