© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/09/17
TVS Diode Arrays (SPA
® Diodes)TVS Diode Arrays (SPA
® Diodes)TVS Diode Arrays (SPA
® Diodes)
General Purpose ESD Protection - SM712
Description
Applications
The SM712 TVS Diode Array is designed to protect RS-485
applications with asymmetrical working voltages (-7V to
12V) from damage due to electrostatic discharge (ESD),
electrical fast transients (EFT), and lightning induced surges.
The SM712 can absorb repetitive ESD strikes above the
maximum level specified in the IEC 61000-4-2 international
standard without performance degradation and safely
dissipate up to 19A of 8/20us induced surge current (IEC-
61000-4-5 2nd edition) with very low clamping voltages.
Features
• RoHS compliant and
lead-free
• ESD, IEC 61000-4-2,
±30kV contact, ±30kV air
• EFT, IEC 61000-4-4, 50A
(5/50ns)
• Lightning, IEC 61000-
4-5 2nd edition, 19A
(tP=8/20μs)
• Working Voltages:
-7V to 12V
• Low clamping voltage
• Low leakage current
• AEC-Q101 Qualified
• Moisture Sensitivity
Level (MSL-1)
• RS-485
• Fieldbus
• Modbus
• Profibus
• DMX512
• Security Systems
• AutomatedT eller Machines
(ATMs)
• Lighting Control - DALI
• Communication
Equipments
Pinout and Functional Block Diagram
Life Support Note:
Not Intended for Use in Life Support or Life Saving Applications
The products shown herein are not designed for use in life sustaining or life saving
applications unless otherwise expressly indicated.
RoHS
Pb
GREEN
SM712 Series 600W Asymmetrical TVS Diode Array
12
3
7V
12V
7V
12V
RS-485 Application Example
IC
A
B
RS-485 Port Receiver
SM712
GND
Additional Information
Datasheet Samples
Resources
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/09/17
TVS Diode Arrays (SPA
® Diodes)TVS Diode Arrays (SPA ® Diodes)TVS Diode Arrays (SPA
® Diodes)
General Purpose ESD Protection - SM712
Notes:
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the component. This is a stress only rating and operation of the component at these or any other conditions above
those indicated in the operational sections of this specification is not implied.
Absolute Maximum Ratings
Symbol Parameter Value Units
PPk Peak Pulse Power (tp=8/20μs) 600 W
IPP Peak Pulse Current (tp=8/20μs) 19 A
TOP Operating Temperature -40 to 125 °C
TSTOR Storage Temperature -55 to 150 °C
SM712 Electrical Characteristics (TOP=25ºC)
Parameter Symbol Test Conditions Min Typ Max Units
Reverse Standoff Voltage VRWM
IR≤1μA, Pin 3 to Pin 1 or Pin 2 7. 0 V
IR≤1μA, Pin 1 or Pin 2 to Pin 3 12.0 V
Reverse Breakdown
Voltage VR
IR=1mA, Pin 3 to Pin 1 or Pin 2 7. 5 V
IR=1mA, Pin 1 or Pin 2 to Pin 3 13.3 V
Leakage Current ILEAK
VR=7V 20 μA
VR=12V 1 μA
Clamp Voltage1VC
IPP=1A, tp=8/20µs, Pin 1 or Pin 2 to Pin 3 19 V
IPP=1A, tp=8/20µs, Pin 3 to Pin 1 or Pin 2 11 V
IPP=19A, tp=8/20µs, Pin 1 or Pin 2 to Pin 3 31 V
IPP=19A, tp=8/20µs, Pin 3 to Pin 1 or Pin 2 19 V
Dynamic Resistance1RDYN (VC2 - VC1) / (IPP2 - IPP1) 0.5 Ω
ESD Withstand Voltage1VESD
IEC 61000-4-2 (Contact Discharge) ±30 kV
IEC 61000-4-2 (Air Discharge) ±30 kV
Diode Capacitance1CI/O-GND
Reverse Bias=0V, f=1MHz;
Pin 1 or Pin 2 to Pin 3 75 pF
Capacitance vs. Reverse Bias
0
10
20
30
40
50
60
70
0246810 12
80
Bias Voltage (V)
Capacitance (pF)
Clamping Voltage vs. IPP
0
5
10
15
20
25
30
35
0246810 12 14 16 18 20
Clamp Voltage (V
C
)
Peak Pulse Current-I
PP
(A)
Pin 3 to Pin1 or Pin 2
Pin 1 or Pin 2 to Pin 3
Notes : 1. Parameter is guaranteed by design and/or device characterization.
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/09/17
TVS Diode Arrays (SPA
® Diodes)TVS Diode Arrays (SPA
® Diodes)TVS Diode Arrays (SPA
® Diodes)
General Purpose ESD Protection - SM712
Pulse Waveform
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
110%
0.0 5.0 10.0 15.0 20.0 25.0 30.0
Time (μs)
Percent of I
PP
Time
Temperature
TP
TL
TS(max)
TS(min)
25
tP
tL
tS
time to peak temperature
Preheat
P
rehea
t
Ramp-up
R
amp-up
Ramp-down
R
amp-d
o
Critical Zone
TL to TP
C
ritical Zon
e
T
L
to
T
P
Reflow Condition Pb – Free assembly
Pre Heat
- Temperature Min (Ts(min)) 150°C
- Temperature Max (Ts(max)) 200°C
- Time (min to max) (ts) 60 – 180 secs
Average ramp up rate (Liquidus) Temp (TL)
to peak 3°C/second max
TS(max) to TL - Ramp-up Rate 3°C/second max
Reflow - Temperature (TL) (Liquidus) 217°C
- Temperature (tL) 60 – 150 seconds
Peak Temperature (TP) 260+0/-5 °C
Time within 5°C of actual peak
Temperature (tp)20 – 40 seconds
Ramp-down Rate 6°C/second max
Time 25°C to peak Temperature (TP) 8 minutes Max.
Do not exceed 260°C
Soldering Parameters
Power Derating Curve
0
10
20
30
40
50
60
70
80
90
100
110
0255075100 125150
Ambient Temperature - TA
(
o
C)
% of Rated Power IPP
Non-Repetitive Peak Pulse Power vs. Pulse Time
Pulse Duration - tp
(µs)
Peak Pulse Power - Ppk (kW)
0.01
0.1
1
10
0.11 10 100 1000
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/09/17
TVS Diode Arrays (SPA
® Diodes)TVS Diode Arrays (SPA ® Diodes)TVS Diode Arrays (SPA
® Diodes)
General Purpose ESD Protection - SM712
Ordering Information
Part Number Package Marking Min. Order Qty.
SM712-02HTG SOT23-3 712 3000
Part Numbering SystemPart Marking System
SM 02 TG
Series
Number of
Channels
Package
T= Tape & Reel
G= Green
–
TVS Diode Arrays
(SPA® Diodes)
H: SOT23-3
H
712
Working
Voltage
712
P
e
e1
E
3
12
E1
b
A1
A
D
C
L1
0
N
M
502B
Package SOT23-3
Pins 3
JEDEC TO-236
Millimeters Inches
Min Max Min Max
A0.89 1. 12 0.035 0.044
A1 0.01 0.1 0.0004 0.004
b0.3 0.5 0.012 0.020
c0.08 0.2 0.003 0.008
D2.8 3.04 0.110 0.120
E2.1 2.64 0.083 0.104
E1 1. 2 1. 4 0.047 0.055
e0.95 BSC 0.038 BSC
e1 1.90 BSC 0.075 BSC
L1 0.54 REF 0.021 REF
M– 2.29 – .090
N– 0.95 – 0.038
O– 0.78 – .030TYP
P– 0.78 – .030TYP
Package Dimensions — SOT23-3
Recommended Pad Layout
P
e
e1
E
3
12
E1
b
A1
A
D
C
L1
0
N
M
502B
© 2017 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 10/09/17
TVS Diode Arrays (SPA
® Diodes)TVS Diode Arrays (SPA
® Diodes)TVS Diode Arrays (SPA
® Diodes)
General Purpose ESD Protection - SM712
GENERAL INFORMATION
1. 3000 PIECES PER REEL.
2. ORDER IN MULTIPLES OF FULL REELS ONLY.
3. MEETS EIA-481 REVISION "A" SPECIFICATIONS.
COVER TAPE
USER DIRECTION OF FEED PIN 1
SOT23-3 (8mm POCKET PITCH)
8.4mm
180mm
14.4mm
13mm
60mm
ACCESS HOLE
8mm TAPE AND REEL
Embossed Carrier Tape & Reel Specification — SOT23-3
Symbol
Millimetres Inches
Min Max Min Max
E1.65 1.85 0.065 0.073
F3.40 3.60 0.134 0.142
P2 1.90 2.10 0.075 0.083
D1.40 1.60 0.055 0.063
P0 3.90 4.10 0.154 0.161
W7.70 8.30 0.303 0.327
P3.90 4.10 0.154 0.161
A0 3.05 3.25 0.120 0.128
B0 2.67 2.87 0.105 0.113
K0 1. 12 1.32 0.044 0.052
t0.22 0.24 0.009 0.009
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and
test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications.
Read complete Disclaimer Notice at www.littelfuse.com/disclaimer-electronics.
