05208
SRDA3.3-4
STEERING DIODE/ TVS ARRAY COMBO
APPLICATIONS
✔
Ethernet - 10/100 Base T
✔
Computer I/O Ports - SCSI, FireWire & USB
✔
Set-Top Box Protection
✔
Video Card
IEC COMPATIBILITY
(EN61000-4)
✔
61000-4-2 (ESD): Air - 15kV, Contact - 8kV
✔
61000-4-4 (EFT): 40A - 5/50ns
✔
61000-4-5 (Surge): 24A, 8/20µs - Level 2(Line-Gnd) & Level 3(Line-Line)
SO-8
FEATURES
✔
500 Watts Peak Pulse Power per Line (tp=8/20µs)
✔
Unidirectional Configuration
✔
Available in 3.3V
✔
Protects Up to Four (4) I/O Ports
✔
ESD Protection > 40 kilovolts
✔
Low Capacitance: 15pF
✔
RoHS Compliant
MECHANICAL CHARACTERISTICS
✔
Molded JEDEC SO-8
✔
Weight 70 milligrams (Approximate)
✔
Available in Lead-Free Pure-Tin Plating(Annealed)
✔
Solder Reflow Temperature:
Pure-Tin - Sn, 100: 260-270°C
✔
Consult Factory for Leaded Device Availability
✔
Flammability Rating UL 94V-0
✔
12mm Tape and Reel Per EIA Standard 481
✔
Marking: Marking Code, Logo, Date Code & Pin One Defined By Dot on Top of Package
PIN CONFIGURATION
GND
I/O 4
I/O 3
GND
8
7
6
5
1
I/O 1
2
+V
REF
3
+V
REF
4
I/O 2
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SRDA3.3-4
DEVICE CHARACTERISTICS
MAXIMUM RATINGS
@ 25°C Unless Otherwise Specified
PARAMETER
Peak Pulse Power (t
p
= 8/20µs) - See Figure 1
Operating Temperature
Storage Temperature
Maximum Forward Voltage @ 10mA (See Note 1)
Note 1:
Measured between pins 8 or 5 to 1, 2, 3, 4, 6 and 7.
SYMBOL
P
PP
T
L
T
STG
V
F
VALUE
500
-55 to 150
-55 to 150
1.5
UNITS
Watts
°C
°C
Volts
ELECTRICAL CHARACTERISTICS PER LINE
PART
NUMBER
DEVICE
MARKING
RATED
STAND-OFF
VOLTAGE
MINIMUM
BREAKDOWN
VOLTAGE
@ 25°C Unless Otherwise Specified
MAXIMUM
CLAMPING
VOLTAGE
(See Fig. 2)
@ I
P
= 1A
V
C
VOLTS
5.3
MAXIMUM
CLAMPING
VOLTAGE
(See Fig. 2)
MAXIMUM
LEAKAGE
CURRENT
MAXIMUM
CAPACITANCE
(See Note 1)
(See Figure 5)
@0V, 1 MHz
C
j(SD)
pF
15
V
WM
VOLTS
SRDA3.3-4
SRD
3.3
@ 1mA
V
(BR)
VOLTS
4.0
@8/20µs
V
C
@ I
PP
10.9V @ 43.0A
@V
WM
I
D
µA
1
Note 1:
Capacitance measured at V
WM
= V
CC
connected between I/O pins to pin 8 and 5 (Gnd). V
R
= V
WM
@ 1MHz. As shown in Figure 5, REF1 is
connected to ground, REF2 is connected to +V
CC
, and input applies to V
CC
= 5V, V
sign
= mV, F = 1 MHz.
10,000
P
PP
- Peak Pulse Power - Watts
FIGURE 1
PEAK PULSE POWER VS PULSE TIME
I
PP
- Peak Pulse Current - % of I
PP
120
100
80
60
40
20
0
t
f
FIGURE 2
PULSE WAVE FORM
Peak Value I
PP
TEST
WAVEFORM
PARAMETERS
t
f
= 8µs
t
d
= 20µs
1,000
500W 8/20µs Waveform
e
-t
100
t
d
= t I /2
PP
10
0.1
1
10
100
t
d
- Pulse Duration - µs
1,000
10,000
0
5
10
15
t - Time - µs
20
25
30
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SRDA3.3-4
GRAPHS
FIGURE 3
POWER DERATING CURVE
Peak Pulse Power
8/20µs
100
80
% Of Rated Power
60
40
20
Average Power
0
0
25
50
75
100
125
T
L
- Lead Temperature - °C
150
FIGURE 4
INPUT CAPACITANCE CIRCUIT
REF2
I/O
+V
CC
V
R
G
REF1
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SRDA3.3-4
APPLICATION NOTE
The SRDA3.3-4 is a low capacitance, unidirectional TVS array that is designed to protect I/O or high speed data lines from the damaging effects of
ESD or EFT. This product has a surge capability of 500 Watts P
PP
per line for an 8/20µs waveshape and offers ESD protection > 40kV.
DIFFERENTIAL-MODE CONFIGURATION (Figure 1)
Ideal for use in USB applications, the SRDA3.3-4 provides up to four
(4) lines of protection in a differential-mode configuration as depicted
in Figure 1.
Circuit connectivity is as follows:
✔
Pins 1, 4, 6 and 7 are connected to the data lines.
✔
Pins 5 and 8 are connected to ground.
✔
Pins 2 and 3 are connected to the databus.
4
3
Figure 1. Typical Differential-Mode USB Protection
USB PORT
D+
D-
V
BUS
2
1
V
BUS
GND
The SRDA3.3-4 also provides up to four (4) lines of protection in a
differential-mode configuration as depicted in Figure 2 for T1/E1
applications.
Circuit connectivity is as follows:
✔
Pins 1, 4, 6 and 7 are connected to the data lines.
✔
Pins 5 and 8 are connected to ground.
✔
Pins 2 and 3 are connected to the databus.
USB CONTROLLER
DIFFERENTIAL-MODE CONFIGURATION (Figure 2)
5
6
7
8
USB PORT
GND
GND
D+
V
BUS
CIRCUIT BOARD LAYOUT RECOMMENDATIONS
Circuit board layout is critical for Electromagnetic Compat-
ibility (EMC) protection. The following guidelines are
recommended:
✔
The protection device should be placed near the input
terminals or connectors, the device will divert the
transient current immediately before it can be coupled
into the nearby traces.
The path length between the TVS device and the
protected line should be minimized.
All conductive loops including power and ground
loops should be minimized.
The transient current return path to ground should be
kept as short as possible to reduce parasitic induc-
tance.
Ground planes should be used whenever possible.
For multilayer PCBs, use ground vias.
D-
GND
Figure 2. Typical Differential-Mode T1/E1 Protection
PTC
RTIP
PLC01-
6
RRING
PTC
T1/E1 TRANSCEIVER
4
3
2
1
✔
✔
✔
✔
5
6
7
8
GND
TTIP
GND
PTC
PLC01-
6
TRING
PTC
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SRDA3.3-4
SO-8 PACKAGE OUTLINE & DIMENSIONS
PACKAGE OUTLINE
-A-
SO-8
8
5
-B - P
0.010 (0.25 MM) M B M
4 PL
+
PACKAGE DIMENSIONS
DIM
A
B
C
D
F
G
J
K
P
R
NOTES
1.
2.
3.
4.
5.
6.
- T - = Seating Plane and Datum Surface.
Dimensions “A” and “B” are Datum.
Dimensions “A” and “B” do not include mold protrusion.
Maximum mold protrusion is 0.015” (0.380 mm) per side.
Dimensioning and tolerances per ANSI Y14.5M, 1982.
Dimensions are exclusive of mold flash and metal burrs.
1
4
MILLIMETERS
MIN
MAX
4.80
3.80
1.35
0.35
0.40
1.27 BSC
0.18
0.10
5.80
0.25
INCHES
MIN
MAX
G
D
C
R x 45°
0° - 10°
K
+
0.010 (0.25 MM) M T B S A S
8 PL
0.050 ± 0.005
-T-
J
F
0.196
5.00
0.189
0.150
0.157
4.00
1.75
0.054
0.068
0.49
0.014
0.019
0.049
1.250
0.016
1.27 BSC 0.05 BSC 0.05 BSC
0.25
0.007
0.009
0.004
0.008
0.25
6.20
0.229
0.244
0.019
0.50
0.010
MOUNTING PAD
0.030 ± 0.005
TAPE & REEL/BULK ORDERING NOMENCLATURE
1. Surface mount product is taped and reeled in accordance with EIA-481.
2. Suffix-T7 = 7 Inch Reel - 1,000 pieces per 12mm tape,
i.e. SRDA3.3-4-T7.
3. Suffix-T13 = 13 Inch Reel - 2,500 pieces per 12mm tape,
i.e., SRDA3.3-4-T13.
4. Suffix - LF = Lead-Free, Pure-Tin Plating, i.e., SRDA3.3-4-LF-T7.
5. No Suffix = Product Shipped in Tubes of 98 pcs per Tube.
0.160 ± 0.005
0.245 MIN
0.045 ± 0.005
Outline & Dimensions: Rev 1 - 11/01, 06009
COPYRIGHT © ProTek Devices 2007
SPECIFICATIONS: ProTek reserves the right to change the electrical and or mechanical characteristics described herein without notice (except JEDEC).
DESIGN CHANGES: ProTek reserves the right to discontinue product lines without notice, and that the final judgement concerning selection and specifications is
the buyer’s and that in furnishing engineering and technical assistance, ProTek assumes no responsibility with respect to the selection or specifications of such
products.
ProTek Devices
2929 South Fair Lane, Tempe, AZ 85282
Tel: 602-431-8101 Fax: 602-431-2288
E-Mail: sales@protekdevices.com
Web Site: www.protekdevices.com
www.protekdevices.com
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