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SLVU2.8-8
PROTECTION PRODUCTS
Applications Information (continued)
EPD TVS? Characteristics
The SLVU2.8-8 is constructed using Semtech’s propri-
etary EPD technology. The structure of the EPD TVS is
vastly different from the traditional pn-junction devices.
At voltages below 5V, high leakage current and junction
capacitance render conventional avalanche technology
impractical for most applications. However, by utilizing
I PP
I SB
the EPD technology, the SLVU2.8-8 can effectively
operate at 2.8V while maintaining excellent electrical
characteristics.
V BRR
I PT
I R
V RWM
V SB V PT V C
I BRR
The EPD TVS employs a complex nppn structure in
contrast to the pn structure normally found in tradi-
tional silicon-avalanche TVS diodes. The EPD mecha-
nism is achieved by engineering the center region of
the device such that the reverse biased junction does
not avalanche, but will “punch-through” to a conduct-
ing state. This structure results in a device with supe-
rior dc electrical parameters at low voltages while
maintaining the capability to absorb high transient
currents.
The IV characteristic curve of the EPD device is shown
in Figure 1. The device represents a high impedance
to the circuit up to the working voltage (V RWM ). During a
transient event, the device will begin to conduct as it is
biased in the reverse direction. When the punch-
through voltage (V PT ) is exceeded, the device enters a
low impedance state, diverting the transient current
away from the protected circuit. When the device is
conducting current, it will exhibit a slight “snap-back” or
negative resistance characteristic due to its structure.
This must be considered when connecting the device
to a power supply rail. To return to a non-conducting
state, the current through the device must fall below
the snap-back current (approximately < 50mA).
EPD TVS VI Characteristic Curve
? 2008 Semtech Corp.
6
www.semtech.com
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相关PDF资料
SLVU2.8HTG
TVS DIODE ARRAY 1CH SOT23
SM-LP-5001E
TRANSF LINE MATCHING SMD
SM-LP-5002E
TRANSF LINE MATCHING SMD
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UPS 1000VA 640W 6OUT RACK/TOWER
SM1050NAFTA
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SM1500NAFTA
UPS 1500VA 980W 6OUT TOWER
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相关代理商/技术参数
SLVU2.8-8.TBT
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制造商:ProTek Devices 功能描述:2.8V 4 LINE BI-DIRECTIONAL
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