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SLVU2.8K
UNIDIRECTIONAL TVSarray TM
SCOTTSDALE DIVISION
PRODUCT PREVIEW
W W W .Microsemi . COM
DESCRIPTION Microsemi's proprietary Zener process provides low standoff voltages and the lowest standby current in the industry of 0.1A. 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 unidirectional 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. FEATURES
* * * * Protects 2.8 voltage components Protects 1 unidirectional line to ground Unidirectional single line capacitance 5.0 pF LOW LEAKAGE 0.1 A * *
T V S arrayTM S E R I E S
APPLICATIONS EIA-RS232 data rates 19.6kbs EIA-RS422 data rates 10Mbs EIA-RS423 data rates 100kbs 200 MHz maximum
PACKAGING
Tape & Reel per EIA Standard 481 3,000 pieces per 7 inch reel
MAXIMUM RATINGS
* * * Operating Temperature: -55C to +150C Storage Temperature: -55C to +150C Peak Pulse current 24 Amps at 8/20 s (FIGURE 2) * * *
MECHANICAL
Molded SOT23 Surface Mount Weight .014 grams (approximate) Body Marked with device number
ELECTRICAL CHARACTERISTICS PER LINE @ 25C Unless otherwise specified
REVERSE STAND-OFF VOLTAGE VWM Pin 3 to 1 OR Pin 2 to 1 VOLTS MAX 2.8 PUNCHTHROUGH VOLTAGE VPT I PT = 2A Pin 3 to 1 VOLTS MIN 3.0 SNAP-BACK VOLTAGE VSB I SB = 50mA Pin 3 to 1 VOLTS MIN 2.8 CLAMPING VOLTAGE VC @ 2 Amp Pin 3 to 1 VOLTS MAX 3.9 CLAMPING VOLTAGE VC @ 5 Amp Pin 3 to 1 VOLTS MAX 7.0 CLAMPING VOLTAGE VC @ 24 Amp Pin 3 to 1 VOLTS MAX 12.5 CLAMPING VOLTAGE VC @ 2 Amp Pin 2 to 1 VOLTS MAX 5.5
PART NUMBER
DEVICE MARKING
SLVU2.8K
SLVU2.8K
U2.8
CLAMPING VOLTAGE VC @ 5 Amp Pin 2 to 1 VOLTS MAX 8.5
CLAMPING VOLTAGE VC @ 24 Amp Pin 2 to 1 VOLTS MAX 15
STANDBY (LEAKAGE) CAPACITANCE CURRENT (f=1 MHz) ID @0V VWM = 2.8V C T = 25C Pin 3 to 1 & 2 Pin 3 to 1 or 2 to 1 A pF MAX TYP 0.1 50
CAPACITANCE (f=1 MHz) @0V C Pin 2 to 1 (3 N.C.) pF TYP 5.0
REVERSE BREAKDOWN VBR @I T = 10A Pin 3 to 2 VOLTS MIN 40
REVERSE LEAKAGE CURRENT I RD @ VWM = 2.8V T = 25C Pin 3 to 2 A MAX 0.1
FORWARD VOLTAGE I F = 1A, tp = 120 s Pin 2 to 3 VOLTS MAX 2
"ELECTRICAL CHARACTERISTICS FOR STEERING DIODE"
Copyright (c) 2001 MSC1708.PDF 02-08 2001 REV G
Microsemi
Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 1
SLVU2.8K
UNIDIRECTIONAL TVSarray TM
SCOTTSDALE DIVISION
PRODUCT PREVIEW
W W W .Microsemi . COM
S Y M B O L S & D E F I N I T I O NS Symbol VWM VPT VSB VC ID C DEFINITION 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 Punch-Thru Voltage: The minimum voltage the device will exhibit at a specified current Snap-Back Voltage: The minimum snap-back voltage the device will exhibit at a specified current Clamping Voltage: Maximum clamping voltage across the TVS device when subjected to a given current at a pulse time of 20 s. Standby Current: Leakage current at VWM. Capacitance: Capacitance of the TVS as defined @ 0 volts at a frequency of 1 MHz and stated in pico Farads. GRAPHS
Ppp Peak Pulse Power (Kw)
10000 8/20 s 400W Pulse 1000
100
10 100ns 1s 10s 100s 1ms 10ms FIGURE 2 Pulse Wave Form
FIGURE 1 Peak Pulse Power Vs Pulse Time
PACKAGING AND SCHEMATIC
GRAPHS PACKAGE DATA
Copyright (c) 2001 MSC1708.PDF 02-08 2001 REV G
Microsemi
Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 2
SLVU2.8K
UNIDIRECTIONAL TVSarray TM
SCOTTSDALE DIVISION
PRODUCT PREVIEW
W W W .Microsemi . COM
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 the 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 connected 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 threat 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 3 Capacitance 10 pf
Figure 1 Capacitance 50 pf
Figure 2 Capacitance 10 pf
APPLICATIONS
Copyright (c) 2001 MSC1708.PDF 02-08 2001 REV G
Microsemi
Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503
Page 3

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