© 2013 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: 04/24/13

General Purpose ESD Protection - SP724 Series

ESD Capability

ESD rating is dependent on the defined test standard. The

evaluation results for various test standards and methods

based on Figure 1 are shown in Table 1.3

The SP724 has a Level 4 rating when tested to the IEC

61000-4-2 Human Body Model (HBM) standard and

connected in a circuit in which the V+ and V- pins have

a return path to ground. Level 4 specifies a required

capability greater than 8kV for direct discharge and greater

than 15kV for air discharge.

The “Modified” MIL-STD-3015.7 condition is defined as an

“in-circuit” method of ESD testing, the V+ and V- pins have

a return path to ground.The SP724 ESD capability is greater

than 8kV with 100pF discharged through 1.5kΩ. By strict

definition of the standard MIL-STD-3015.7 method using

“pin-to-pin” device testing, the ESD voltage capability is

greater than 2kV.

For the SP724 EIAJ IC121 Machine Model (MM) standard,

the ESD capability is typically greater than 1.8kV with

200pF discharged through 0kΩ.

The Charged Device model is based upon the self-

capacitance of the SOT-23 package through 0kΩ.

Standard

Type/Mode

R

D

C

D

±V

D

IEC 61000-4-2

(Level 4)

HBM, Air Discharge

330 Ω 150pF

15kV

HBM, Direct Discharge 330 Ω 150pF

8kV

MIL-STD-3015.7

Modified HBM

1.5k Ω 100pF 8kV †

Standard HBM

1.5k Ω 100pF

2kV

EIAJ IC121

Machine Model

0k Ω

200pF

400V

US ESD DS 5.3

Charged Device

Model

0k Ω

NA

3kV

H.V.

SUPPLY

IN

DUT

CHARGE

SWITCH

DISCHARGE

SWITCH

FIGURE 1. ELECTR OSTATIC DISCHARGE TEST

†Upper limit of laboratory test set.

600800

1000

1200

200

160

120

80

40

0

SINGLE PULSE

T

FORWARD SCR VOLTAGE DROP (mV)

5

4

3

2

1

0

T

SINGLE PULSE

EQUIV. SAT. ON

THRESHOLD ~ 1.1V

FORWARD SCR VOLTAGE DROP (V)

01

23

600800

1000

1200

200

160

120

80

40

0

SINGLE PULSE

T

FORWARD SCR VOLTAGE DROP (mV)

5

4

3

2

1

0

T

SINGLE PULSE

EQUIV. SAT. ON

THRESHOLD ~ 1.1V

FORWARD SCR VOLTAGE DROP (V)

01

23

Figure 1: Electrostatic Discharge Test

Table 1: ESD Test Conditions

Figure 3: High Current SCR ForwardVoltage Drop Curve

Figure 2: Low Current SCR Forward Voltage Drop Curve