Littelfuse SP721 Lead-Free_Green Series - Manual (Page 3)

© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 04/24/13
TVS Diode Arrays
(SPA ® Diodes)
General Purpose ESD Protection - SP721 Series
ESD Capability
ESD capability is dependent on the application and defined
test standard.The evaluation results for various test
standards and methods based on Figure 1 are shown in
Table 1.
For the “Modified”MIL-STD-3015.7 condition that is defined
as an “in-circuit” method of ESD testing, the V+ and V- pins
have a return path to ground and the SP721 ESD capability
is typically greater than 15kV from 100pF through 1.5kΩ.By
strict definition of MIL-STD-3015.7 using “pin-to-pin”device
testing, the ESD voltage capability is greater than 6kV.The
MIL-STD-3015.7 results were determined from AT&T ESD
Test Lab measurements.
The HBM capability to the IEC 61000-4-2 standard is
greater than 15kV for air discharge (Level 4) and greater
than 4kV for direct discharge (Level 2).Dual pin capability (2
adjacent pins in parallel) is well in excess of 8kV (Level 4).
For ESD testing of the SP721 to EIAJ IC121 Machine
Model (MM) standard, the results are typically better than
1kV from 200pF with no series resistance.
Standard Type/Mode R
D
C
D
±V
D
MIL STD 3015.7
Modified HBM 1.5kΩ 100pF 15kV
Standard HBM 1.5kΩ 100pF 6kV
IEC 61000-4-2
HBM, Air Discharge 330Ω 150pF 15kV
HBM, Direct Discharge 330Ω 150pF 4kV
HBM, Direct Discharge,
Two Parallel Input Pins
330Ω 150pF 8kV
EIAJ IC121 Machine Model 0kΩ 200pF 1kV
H.V.
SUPPLY
V
D
IN
DUT
C
D
R
1
IEC 1000-4-2: R
1
50 to 100M
R
D
CHARGE
SWITCH
DISCHARGE
SWITCH
MIL-STD-3015.7: R
1
1 to 10M
100
80
60
40
20
0
T
A
= 25ºC
SINGLE PULSE
2.5
2
1.5
1
0.5
0
V FWD
IFWD
EQUIV. SAT. ON
THRESHOLD ~ 1.1V
600 800 1000 1200
FORWARD SCR VOLTAGE DROP (mV)
FOR
W
ARD SCR CURRENT (mA)
0 1 2 3
FOR
W
ARD SCR CURRENT (A
)
FORWARD SCT VOLTAGE DROP (V)
T
A
= 25ºC
SINGLE PULSE
100
80
60
40
20
0
T
A
= 25ºC
SINGLE PULSE
2.5
2
1.5
1
0.5
0
V FWD
IFWD
EQUIV. SAT. ON
THRESHOLD ~ 1.1V
600 800 1000 1200
FORWARD SCR VOLTAGE DROP (mV)
FOR
W
ARD SCR CURRENT (mA)
0 1 2 3
FOR
W
ARD SCR CURRENT (A
)
FORWARD SCT VOLTAGE DROP (V)
T
A
= 25ºC
SINGLE PULSE
Figure 1: Electrostatic Discharge Test
Table 1: ESD Test Conditions
Figure 3: High Current SCR Forward Voltage Drop Curve Figure 2: Low Current SCR Forward Voltage Drop Curve