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TVS Diode Arrays (SPA ? Diodes)
Lightning Surge Protection - SLVU2.8 Series
Application Example Detail
Product Characteristics
Data Line
Protection of one unidirectional line
Lead Plating
Lead Material
Lead Coplanarity
Substitute Material
Matte Tin
Copper Alloy
0.0004 inches (0.102mm)
Silicon
Protection of one unidirectional data line is realized by
D1
NC
D2
Low 3 to 1 (GND), of one high the Data
connecting pin 3 to the protected line, and pins 1 and 2 to
GND. In this configuration, the device presents a maximum
loading capacitance of tens of picofarads. During positive
transients, the internal TVS diode will conduct and steer
current Line from pin capacitance protection clamping speed data pair line at or
below the specified voltages for the device (see Electrical
Characteristics section). For negative transients, the internal
compensating diode is forward biased, steering the current
from pin 2 (GND) to 3.
Protection of one unidirectional line
D1
Body Material Molded Epoxy
Flammability UL 94 V-0
Notes :
1. All dimensions are in millimeters
2. Dimensions include solder plating.
3. Dimensions are exclusive of mold flash & metal burr.
4. Blo is facing up for mold and facing down for trim/form, i.e. reverse trim/form.
5. Package surface matte finish VDI 11-13.
Soldering Parameters
NC
Reflow Condition
- Temperature Min (T s(min) )
Pb – Free assembly
150°C
D2
Pre Heat
- Temperature Max (T s(max) )
200°C
Low capacitance protection of one high speed data pair
Low capacitance protection of a high-speed data pair is
realized by connecting two devices in antiparallel. As shown,
pin 1 of the first device is connected to D1 and pin 2 is
connected to D2. Additionally, pin 2 of the second device is
connected to D1 and pin 1 is connected to D2. Pin 3 must be
NC (or not connected) for both devices. When the potential
on D1 exceeds the potential on D2 (by the rated standoff
voltage), pin 2 on the second device will steer current into
pin 1. The compensating diode will conduct in the forward
direction steering current into the avalanching TVS diode
which is operating in the reverse direction. For the opposite
transient, the first device will behave in the same manner. In
this two device arrangement, the total loading capacitance is
two times the rated capacitance from pin 2 to pin 1 which will
typically be much less than 10pF making it suitable for high-
speed data pair such as 10/100/1000 Ethernet.
NC
RJ-45
Connector
J1
- Time (min to max) (t s )
Average ramp up rate (Liquidus) Temp
(T L ) to peak
T S(max) to T L - Ramp-up Rate
- Temperature (T L ) (Liquidus)
Reflow
- Temperature (t L )
Peak Temperature (T P )
Time within 5°C of actual peak
Temperature (t p )
Ramp-down Rate
Time 25°C to peak Temperature (T P )
Do not exceed
T P
Ramp-up
T L
T S(max)
Preheat
60 – 180 secs
3°C/second max
3°C/second max
217°C
60 – 150 seconds
260 +0/-5 °C
20 – 40 seconds
6°C/second max
8 minutes Max.
260°C
t P
Critical Zone
T L to T P
t L
Ramp-down
Ethernet
PHY
T S(min)
t S
J8
? 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: 04/24/13
NC
25
time to peak temperature
Time
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