TVS Diode Arrays
Electronic Protection Array for ESD and Overvoltage Protection
SP720
The SP720 is an array of SCR/Diode bipolar structures for ESD and
over-voltage protection to sensitive input circuits. The SP720 has 2
protection SCR/Diode device structures per input. A total of 14 available
inputs can be used to protect up to 14 external signal or bus lines.
Over-voltage protection is from the IN (pins 1-7 and 9-15) to V+ or V-.
The SCR structures are designed for fast triggering at a threshold of one
+V BE diode threshold above V+ (Pin 16) or a -V BE diode threshold
below V- (Pin 8). From an IN input, a clamp to V+ is activated if a tran-
sient pulse causes the input to be increased to a voltage level greater
than one V BE above V+. A similar clamp to V- is activated if a negative
pulse, one V BE less than V-, is applied to an IN input. Standard ESD
Human Body Model (HBM) Capability is:
Refer to Figure 1 and Table 1 for further detail. Refer to Application Note
AN9304 and AN9612 for additional information.
Ordering Information
Pinout
SP720AP
SP720AB
SP720ABT
PART NO.
HBM STANDARD
IEC 61000-4-2
MIL-STD-3015.7
228
TEMP. RANGE
-40 to 105
-40 to 105
-40 to 105
(
Air
Direct
Direct, Dual Pins
Direct, In-circuit
o
IN
IN
IN
IN
IN
IN
IN
C)
V-
SP720 (PDIP, SOIC)
MODE
1
2
3
4
5
6
7
8
TOP VIEW
16 Ld PDIP
16 Ld SOIC
16 Ld SOIC
Tape and Reel
PACKAGE
1.5kΩ
330Ω
330Ω
330Ω
R
16
15
14
13
12
11
10
9
V+
IN
IN
IN
IN
IN
IN
IN
150pF
150pF
150pF
100pF
C
E16.3
M16.15
M16.15
PKG.
NO.
ESD (V)
>15kV
>15kV
>4kV
>8kV
w w w . l i t t e l f u s e . c o m
1500
1970
2500
Order
Min.
Features
• ESD Interface Capability for HBM Standards
• High Peak Current Capability
• Operating Temperature Range . . . . . . . . . . . . . . . . . . . . -40
Applications
• Microprocessor/Logic Input Protection
• Data Bus Protection
• Analog Device Input Protection
• Voltage Clamp
Functional Block Diagram
• Designed to Provide Over-Voltage Protection
• Fast Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2ns Risetime
• Low Input Leakages . . . . . . . . . . . . . . . . . . . . . . . . . 1nA at 25
• Low Input Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3pF (Typ)
• An Array of 14 SCR/Diode Pairs
- MIL STD 3015.7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15kV
- IEC 61000-4-2, Direct Discharge,
- IEC 61000-4-2, Air Discharge . . . . . . . . . . . . . . . . . 15kV (Level 4)
- IEC 61000-4-5 (8/20µs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3A
- Single Pulse, 100µs Pulse Width. . . . . . . . . . . . . . . . . . . . . . . ±2A
- Single Pulse, 4µs Pulse Width. . . . . . . . . . . . . . . . . . . . . . . . . ±5A
- Single-Ended Voltage Range to . . . . . . . . . . . . . . . . . . . . . . +30V
- Differential Voltage Range to. . . . . . . . . . . . . . . . . . . . . . . . . ±15V
Two Inputs in Parallel . . . . . . . . . . . . . . . . . . . . . . . . 8kV (Level 4)
Single Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4kV (Level 2)
V+ 16
IN
V-
1
8
IN
2
IN
3 - 7
9 - 15
o
C to 105
o
C (Typ)
o
C