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©2011 Littelfuse, Inc.

Specifications are subject to change without notice.

Please refer to

Revision: April 14, 2011

SP720 Lead-Free/Green Series

General Purpose ESD Protection - SP720 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 SP720

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 SP720 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

IN

DUT

CHARGE

SWITCH

DISCHARGE

SWITCH

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

600

800

1000

1200

100

80

60

40

20

0

T

SINGLE PULSE

FORWARD SCR VOLTAGE DROP (mV)

2.5

2

1.5

1

0.5

0

V FWD

IFWD

3

EQUIV. SAT. ON

THRESHOLD ~ 1.1V

T

SINGLE PULSE

FORWARD SCR VOLTAGE DROP (V)

2

1

0