19-4699; 7/09
ESD Protection Diode with Resistors
www.maxim-ic.com
SPECIAL FEATURES
Zener characteristic with voltage snap–back
to protect against ESD hits
High avalanche voltage, low leakage and low
capacitance avoid signal attenuation
Compatible to all 5V logic families
Space saving, low inductance TSOC surface
mount package
On–chip 5resistors for isolation at both
anode and cathode terminals
Industrial temperature range
SYMBOL AND CONVENTI
C
IC
A
PACKAGE OUTLINE
TSOC SURFACE MOUNT PACKAGE
6 1
5 2
4 3
TOP VIEW
DS9503
ONS
VCA
SIDE VIEW
ORDERING INFORMATION
DS9503P+ 6-lead TSOC package
DS9503P+T&R 6-lead TSOC package
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
DESCRIPTION
This DS9503 is designed as an ESD protection device for 1–Wire MicroLAN interfaces. In contrast to the
DS9502, the DS9503 includes two 5isolation resistors on chip. Although 5are negligible during
communication, they represent a high impedance relative to the conducting diode during an ESD event.
Thus, the diode absorbs the energy while the resistors further isolate and protect the circuit at the other
side of the package. If used with circuits that already have a strong ESD–protection at their I/O port, the
ESD protection level is raised to more that 27 kV (IEC 801–2 Reference model). In case of abnormal
ESD hits beyond its maximum ratings the DS9503 will eventually fail “short” thus preventing further
damage.
During normal operation the DS9503 behaves like a regular Zener Diode. When the voltage exceeds the
trigger voltage, the I/V characteristic of the device will “snapback” allowing the same or higher amount
of current to flow, but at a significantly lower voltage. As long as a minimum current or voltage is
maintained, the device will stay in the “snapback mode”. If the voltage or the current falls below the
holding voltage or holding current, the device will abruptly change to its normal mode and conduct only a
small leakage current.
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DC CHARACTERISTICS Figure 1
IC/A
1.0
0.8
0.6
0.4
0.2
I-TRIGGER
SEE DETAIL DRAWING
DS9503
1 2 3 4 5 6 7 8 9 10 11
DC CHARACTERISTICS DETAIL DRAWING Figure 2
TEST PULSE WAVEFORM Figure 3
VCA/V
V-TRIGGER VAV
TYPICAL APPLICATION Figure 4
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DS9503
ABSOLUTE MAXIMUM RATINGS*
Operating Temperature –40°C to +85°C
Storage Temperature –55°C to +125°C
Soldering Temperature 260°C for 10 seconds
Continuous DC Current Through Package 80 mA
This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability
ELECTRICAL CHARACTERISTICS (-40C to +85C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Leakage Current I
Avalanche Voltage V
Trigger Voltage V
Trigger Current I
Holding Voltage V
Holding Current I
Forward Voltage (-10 mA) V
Forward Current (-0.7V) I
Maximum Peak Current I
Continuous Current Through Diode I
Isolation Resistance R
L
AV
TRIGGER
TRIGGER
HOLD
HOLD
F
F
PP
CC
I
CAPACITANCE (t
30 100 nA 1
7.4 11.05 V 2,3
10 11 V 2, 4
1000 mA 4
5.5 V 2,4
11 mA 4
-0.7 -0.8 V 5
-10 -100 mA 5
2.0 A 6
80
5
mA
=25C)
A
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Junction Capacitance (5V) C
Junction Capacitance (0V) C
J5
J0
40 pF 2
70 pF 2
THERMAL RESISTANCE
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Junction To Package
Junction To Ambient
R
R
JC
JA
75 K/W
200 K/W
NOTES:
1. At 7.0V.
2. All voltages are referenced from Cathode to Anode.
3. At 0.3 A.
4. Not production tested, guaranteed by design.
5. Typical values at room temperature.
6. See pulse specification.
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REVISION HISTORY
REVISION
DATE
Added “lead-free” note to the Ordering Information table. 1
Fixed the X/Y scale in Figure 1. 2
In the Electrical Characteristics table, changed the VAV specification maximum
072209
value to 11V; the V
to 11V; the I
specification minimum value to an 11mA.
Added note 4 (“Not production tested, guaranteed by design”) to the V
I
TRIGGER
, V
TRIGGER
HOLD
DESCRIPTION
specification typical value to 10V and maximum value
TRIGGER
specification typical value to a blank; and the IH
, and I
specifications in the Electrical Characteristics table.
HOLD
OLD
TRIGGER
DS9503
PAGES
CHANGED
3
,
3
4 of 4
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