19-4699; 7/09
DS9503
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
SYMBOL AND CONVENTIONS
C
IC
VCA
A
PACKAGE OUTLINE
TSOC SURFACE MOUNT PACKAGE
1
6
5
4
SIDE VIEW
On–chip 5resistors for isolation at both
anode and cathode terminals
Industrial temperature range
2
3
TOP VIEW
ORDERING INFORMATION
DS9503P+
DS9503P+T&R
6-lead TSOC package
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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DS9503
ABSOLUTE MAXIMUM RATINGS*
Operating Temperature
Storage Temperature
Soldering Temperature
Continuous DC Current Through Package
–40°C to +85°C
–55°C to +125°C
260°C for 10 seconds
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
PARAMETER
Leakage Current
Avalanche Voltage
Trigger Voltage
Trigger Current
Holding Voltage
Holding Current
Forward Voltage (-10 mA)
Forward Current (-0.7V)
Maximum Peak Current
Continuous Current Through Diode
Isolation Resistance
SYMBOL
I
L
V
AV
V
TRIGGER
I
TRIGGER
V
HOLD
I
HOLD
V
F
I
F
I
PP
I
CC
R
I
5
5.5
11
-0.7
-10
2.0
80
-0.8
-100
7.4
10
MIN
TYP
30
MAX
100
11.05
11
1000
(-40C to +85C)
UNITS
nA
V
V
mA
V
mA
V
mA
A
mA
NOTES
1
2,3
2, 4
4
2,4
4
5
5
6
CAPACITANCE
PARAMETER
Junction Capacitance (5V)
Junction Capacitance (0V)
SYMBOL
C
J5
C
J0
SYMBOL
R
JC
R
JA
MIN
MIN
TYP
40
70
TYP
MAX
75
200
MAX
pF
pF
(t
A
=25C)
UNITS
NOTES
2
2
NOTES
THERMAL RESISTANCE
PARAMETER
Junction To Package
Junction To Ambient
UNITS
K/W
K/W
NOTES:
1.
2.
3.
4.
5.
6.
At 7.0V.
All voltages are referenced from Cathode to Anode.
At 0.3
A.
Not production tested, guaranteed by design.
Typical values at room temperature.
See pulse specification.
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DS9503
REVISION HISTORY
REVISION
DATE
DESCRIPTION
Added “lead-free” note to the
Ordering Information
table.
Fixed the X/Y scale in Figure 1.
In the
Electrical Characteristics
table, changed the V
AV
specification maximum
value to 11V; the V
TRIGGER
specification typical value to 10V and maximum value
to 11V; the I
TRIGGER
specification typical value to a blank; and the IH
OLD
specification minimum value to an 11mA.
Added note 4 (“Not production tested, guaranteed by design”) to the V
TRIGGER
,
I
TRIGGER
, V
HOLD
, and I
HOLD
specifications in the
Electrical Characteristics
table.
PAGES
CHANGED
1
2
3
072209
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