Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page
1
Copyright 2001
MSC1708.PDF 02-08 2001 REV G
WWW.
Microsemi
.COM
SLVU2.8K
UNIDIRECTIONAL TVSarray ™
PRODUCT PREVIEW
SCOTTSDALE DIVISION
DESCRIPTION
Microsemi’s proprietary Zener process provides low standoff voltages and the
lowest standby current in the industry of 0.1µA. This 3 pin unidirectional array is
designed for use in applications where protection is required at the board level
from voltage transients caused by electrostatic discharge (ESD) as defined by IEC
61000-4-2, electrical fast transients (EFT) per IEC 61000-4-4 and effects of
secondary lighting.
This product is designed to provide protection in the unid irectional mode for 1
line as defined in (Fig 1). Two device in an anti parallel configuration will provide
low capacitance bidirectional protection as defined (Fig 2), and low capacitance
bidirectional one line differential line pair protection as defined in (Fig 3).
These Transient Voltage Suppressor (TVS) diode arrays protect 2.8 volt
components such as DRAM’s SRAM’s CMOS, HCMOS, HSIC, and low voltage
interfaces. Because of the physical size, weight and protection capabilities, this
product is ideal for use in but not limited to miniaturize electronic equipment such
as hand held instruments, computers, computer peripherals and cell phones and
PDA’s.
ELECTRICAL CHARACTERISTICS PER LINE @ 25°C Unless otherwise specified
REVERSE
STAND-OFF
VOLTAGE
VWM
Pin 3 to 1 OR
Pin 2 to 1
VOLTS
PUNCH-
THROUGH
VOLTAGE
VPT
IPT = 2µA
Pin 3 to 1
VOLTS
SNAP-BACK
VOLTAGE
VSB
ISB = 50mA
Pin 3 to 1
VOLTS
CLAMPING
VOLTAGE
VC
@ 2 Amp
Pin 3 to 1
VOLTS
CLAMPING
VOLTAGE
VC
@ 5 Amp
Pin 3 to 1
VOLTS
CLAMPING
VOLTAGE
VC
@ 24 Amp
Pin 3 to 1
VOLTS
CLAMPING
VOLTAGE
VC
@ 2 Amp
Pin 2 to 1
VOLTS
PART
NUMBER DEVICE
MARKING
MAX MIN MIN MAX MAX MAX MAX
SLVU2.8K U2.8 2.8 3.0 2.8 3.9 7.0 12.5 5.5
CLAMPING
VOLTAGE
VC
@ 5 Amp
Pin 2 to 1
VOLTS
CLAMPING
VOLTAGE
VC
@ 24 Amp
Pin 2 to 1
VOLTS
STANDBY
(LEAKAGE)
CURRENT
ID
VWM = 2.8V
T = 25°C
Pin 3 to 1 or 2 to 1
µA
CAPACITANCE
(f=1 MHz)
@0V
C
Pin 3 to 1 & 2
pF
CAPACITANCE
(f=1 MHz)
@0V
C
Pin 2 to 1 (3
N.C.)
pF
REVERSE
BREAKDOWN
VBR
@IT = 10µA
Pin 3 to 2
VOLTS
REVERSE LEAKAGE
CURRENT
IRD @
VWM = 2.8V
T = 25°C
Pin 3 to 2
µA
FORWARD VOLTAGE
IF = 1A, tp = 120 µs
Pin 2 to 3
VOLTS
MAX MAX MAX TYP TYP MIN MAX MAX
8.5 15 0.1 50 5.0 40 0.1 2
SLVU2.8K
TVSarray™ SERIES
APPLICATIONS
§ EIA-RS232 data rates
19.6kbs
§ EIA-RS422 data rates
10Mbs
§ EIA-RS423 data rates
100kbs
§ 200 MHz maximum
FEATURES
• Protects 2.8 voltage components
• Protects 1 unidirectional line to ground
• Unidirectional single line capacitance 5.0 pF
• LOW LEAKAGE 0.1 µA
MAXIMUM RATINGS
• Operating Temperature: -55°C to +150°C
• Storage Temperature: -55°C to +150°C
• Peak Pulse current 24 Amps at 8/20 µs
(FIGURE 2)
MECHANICAL
• Molded SOT23 Surface Mount
• Weight .014 grams (approximate)
• Body Marked with device number
PACKAGING
• Tape & Reel per EIA Standard 481
• 3,000 pieces per 7 inch reel
“ELECTRICAL CHARACTERISTICS FOR STEERING DIODE”
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page
2
Copyright 2001
MSC1708.PDF 02-08 2001 REV G
WWW.
Microsemi
.COM
SLVU2.8K
UNIDIRECTIONAL TVSarray ™
PRODUCT PREVIEW
SCOTTSDALE DIVISION
SYMBOLS & DEFINITIONS
Symbol DEFINITION
VWM Rated stand off voltage: Maximum dc voltage that can be applied over the operating temperature range. Vwm
must be selected to be equal or be greater than the operating voltage of the line to be protected
VPT Punch-Thru Voltage: The minimum voltage the device will exhibit at a specified current
VSB Snap-Back Voltage: The minimum snap-back voltage the device will exhibit at a specified current
VC Clamping Voltage: Maximum clamping voltage across the TVS device when subjected to a given current at a
pulse time of 20 µs.
ID Standby Current: Leakage current at VWM.
C Capacitance: Capacitance of the TVS as defined @ 0 volts at a frequency of 1 MHz and stated in pico Farads.
GRAPHS
PACKAGING AND SCHEMATIC
FIGURE 1
Peak Pulse Power Vs Pulse Time
FIGURE 2
Pulse Wave Form
Ppp Peak Pulse Power (Kw)
GRAPHS PACKAGE
DATA
8/20 µs 400W Pulse
100ns 1µs 10µs 100µs 1ms 10ms
10000
1000
100
10
Microsemi
Scottsdale Division
8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page
3
Copyright
2001
MSC1708.PDF 02-08 2001 REV G
WWW.
Microsemi
.COM
SLVU2.8K
UNIDIRECTIONAL TVSarray ™
PRODUCT PREVIEW
SCOTTSDALE DIVISION
APPLICATION NOTES
Note: Transient Voltage Suppressor (TVS) product is normally selected based on its stand off voltage VWM. Product
selected voltage should be equal to or greater than the continuous peak operating voltage of the circuit to be protected.
All electronic equipment are susceptible to damage generated by ESD, EFT and lightning interference. With
this in mind the SLUV2.8K was designed to provide a level of component protection that meets or exceeds
IEC standards 61000-4-2 and 61000-4-
4 plus moderate levels of induced lightning. This device can be used
for protection on one unidirectional line, one common mode bi-
directional line or one differential line pair.
The following description defines the varieties of product configurations.
Unidirectional one line
For unidirectional protection pin 3 must be connected to the protected
line and pin 1 and 2 to ground. The loading capacitance for this
configuration is no more than 50 pf maximum. When positive transients
are on th
e line the TVS diode will be reversed biased thus taking the
threat from pin 3 to ground and clamping the voltage at the rated VC
of
the device. If a negative transient occurs the threat is handled by the
internal diode and is clamped at the forward-voltage drop of the diode.
Bi-directional one common mode line
For common mode bi-
directional protection, two devices are used in an anti
parallel configuration. Device (D1) pin 1 is connected to the protected line
and pin 2 to ground. Device (D2) pin 2 is co
nnected to the protected line
and pin 1 to ground. The loading capacitance for this configuration is 5 pf
maximum for each device (10 pF total. If positive transients are felt on the
line, the TVS diode (D2) would be reversed biased thus taking the threa
t
from line to ground clamping the voltage at the rated clamping voltage (V C
)
of the device. If a negative transient is felt on the line, the TVS diode D1
would be reversed biased thus taking the threat from line to ground and
clamping the voltage at the rated clamping voltage VC of the device.
Bi-directional one differential line pair
Bi-directional protection of one differential line pair requires two devices
connected in an anti parallel configuration. Device (D1) pin 1 is connected to
line 1 and pin
2 to line 2. Device (D2) pin 2 is connected to the line 1 and pin
1 to line 2. During negative transients, D1 will conduct from pin 2 to pin 1.
During positive transients D2 will conduct from pin 2 to pin 1. The loading
capacitance for this bidirectional configuration is no more than 10 pF
maximum.
Figure 1
Capacitance 50 pf
Figure 2
Capacitance 10 pf
Figure 3
Capacitance 10 pf
APPLICATIONS
