TVS Diode Arrays
Upstream USB Port Terminator with ESD Suppression & EMI Filtering
SPUSB1 Series
The Littelfuse SPUSB1 Series is a multifunctional USB port protection
network designed to provide ESD protection, EMI/RFI filtering and line
termination for a single USB 1.1 port. The SPUSB1 can replace a mini-
mum of ten typically larger “discrete” devices resulting in inventory and
placement cost savings.
The SPUSB1 Series combines Transient Voltage Suppression (TVS)
avalanche diodes, EMI/RFI filtering components (R1 and C1), and
a1.5kΩ termination resistor (R2). The filtering components are included
to satisfy recommendations in the USB 1.1 specification, and the 1.5kΩ
resistor (R2) is included as a pull-up resistor to VBUS.
The SPUSB1 Series can be used for termination and protection
of“upstream” USB devices such as PDAs, digital cameras, scanners and
hubs which are often at risk from transient voltage surges and
electromagnetic interference from both internal and external sources.
To support a wide range of circuit conditions, Littelfuse offers three
resistance values for the series resistor (R1). The series resistance plus
the USB driver output resistance must be close to the USB cable’s char-
acteristic impedance of 45Ω (90Ω balanced) to minimize transmission
line reflections.
Features
Circuit Diagram
SC70-6
1
R1
6
• Compact SC70 package saves board space and lowers
manufacturing costs compared to discrete solutions
• ESD protection to 30kV contact discharge per MIL-STD- 883D,
method 3015
• ESD protection to 15kV contact discharge per IEC 61000-4-2
international standard
5
VBUS
C1
C1
R2
2
GND
Applications
• Desktop/Laptop PCs
• USB peripherals (printers, scanners, zip drives)
• PDAs / wireless handsets
• Digital cameras
• MP3 Players
• Cable Modems
3
R1
4
Ordering Information
PART
NUMBER
SPUSB1AJT
SPUSB1BJT
SPUSB1CJT
R1 (Ohm)
12
22
33
R2 (KOhm)
1.5
1.5
1.5
C1 (pF)
47
47
47
DEVICE
BRAND
UFA
UFB
UFC
PKG
TYPE
SC70-6
SC70-6
SC70-6
#/REEL
3000
3000
3000
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217
TVS DIODE ARRAYS
• One upstream USB port terminator, EMI filter and transient
overvoltage protector in a single surface-mount package
5
TVS Diode Arrays
Upstream USB Port Terminator with ESD Suppression & EMI Filtering
SPUSB1 Series
Absolute Maximum Ratings
Parameter
Supply Voltage VBUS
DC Power per Resistor
Package Power
Temperature Range:
Operating
Storage
Rating
5.5
100
200
-40 to +85
-65 to +150
Unit
V
mW
mW
°
C
Standard
Parameter
Resistance R1 (SPUSB1AJT only)
Resistance R1 (SPUSB1CJT only)
Resistance R1 (SPUSB1BJT only)
Resistance R2
Capacitance C1 @ 2.5 v DC, 1MHz
Diode Leakage at 3.3V
Specifications
(at 25°C unless specified otherwise)
MIN
6%
26%
18%
1.2%
38%
TYP
12
33
22
1.5
47
1
5.5
5.6
-1.2
±30
±15
±25
Positive
Negative
10
-5
6.8
-0.8
8.0
-0.4
MAX
14%
40%
26%
18%
56%
100
Unit
Ω
Ω
Ω
kΩ
pF
nA
V
V
V
kV
kV
kV
V
V
Diode Reverse Bias Stand-off Voltage, 1= 10µA
Signal Clamp Voltage:
Positive Clamp, 10mA
Negative Clamp, 10mA
In-system ESD Withstand Voltage
(1)
Human Body Model (MIL-STD-883D, method 3015
IEC 81000-4-2, contact discharge method (I/O pins)
IEC 81000-4-2, contact discharge method (VBUS pin)
Clamping Voltage During ESD Discharge
(1)
MIL-STD-883D (Method 3015), 8kV
Note:
(1) ESD applied to input/outputV
DD
pins with respect to GND, one at a time.
Clamping Voltage is measured at the opposite side of the EMI filter to the ESD pin (ie: if ESD is applied to pin1 then clamping
voltage is measured at pin 6). Unused pins are open.
These parameters guaranteed by design.
APPLICATIONS INFORMATION
1
D+
D1
USB 1.1
CONTROLLER
IC
GND
GND
C1
C1
R2
3.3V
2
5
VBUS
USB 1.1
CONNECTOR
D4
USB 1.1
CONTROLLER
IC
GND
GND
C1
R1
6
D+
1
D-
D1
C1
R2
3.3V
2
5
VBUS
USB 1.1
CONNECTOR
D4
R1
6
D-
3
D-
D2
R1
4
D-
D3
D+
3
D2
R1
4
D+
D3
Figure 1. Full-Speed Devices (12Mbits per second)
For full speed operation the pull-up resistor R2 is connected to the D+ pin.
Figure 2. Low-Speed Devices (1.5Mbits per second)
Low speed connection requires the pull-up resistor R2 to be connected to the D-
pin. Please note the reversal of the D- and D+ pins on Figure 2 versus Figure 1.
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