Product category:
Circuit Protection Devices
News Release from: Semtech | Subject: LCDA15-1
Edited by the Electronicstalk Editorial
Team on 15 March 2002
Low-capacitance TVS preserves signal
integrity
New from Semtech, the LCDA15-1 low-capacitance transient suppressor protects high-speed data lines from lightning, ESD and other transients while preserving signal integrity.
New from Semtech, the LCDA15-1 low-capacitance transient suppressor protects high-speed data lines from lightning, ESD and other transients while preserving signal integrity The LCDA15-1 is a compact, unidirectional transient voltage suppressor (TVS) boasting less than 15pF (typically just 8pF) junction capacitance, an operating voltage of 15V, and a surge capability of 15A
This article was originally published on Electronicstalk on 16 Jul 2001 at 8.00am (UK)
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As such, the LCDA15-1 meets key requirements for protecting high-speed data lines associated with the latest ADSL transceivers powered from positive voltage supplies, serial and parallel I/O ports, wireless and other portable electronic products, wide and local area networks, and ATM equipment.
Each LCDA15-1 protects one data line in common (line-to-earth) mode using proprietary solid-state silicon-avalanche technology.
"The push to higher datarates, illustrated by the demand for ADSL, and the unwavering requirement to protect sensitive ICs against damage from ESD and lightning-induced transients, makes the LCDA15-1 an extremely attractive choice for datacomms and telecomms equipment designers", noted Tom Dugan, Director of Marketing for Protection Products at Semtech.
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"Everything about the device, electrically and mechanically, is tailored to meet the needs of high-speed signals and tight space constraints".
The low junction capacitance means that, unlike competitive devices having relatively high capacitance, the LCDA15-1 has a negligible impact on the integrity of high-datarate signals.
In contrast, higher-capacitance transient protection devices can distort high-datarate signals on the lines they are intended to protect, compromising signal integrity and increasing the chance of data errors.
Along with the low capacitance, the LCDA15-1 has a 15A surge capacity, affording compliance with the IEC61000-4-5 specification for lightning protection, which is difficult to achieve using discrete components.
The LCDA15-1 also meets the IEC61000-4-2, Level 4 specification for ESD protection.
In addition, the latest ADSL transceivers, as well as other chips that are sensitive to negative-going transients, are further protected by the LCDA15-1's unidirectional conduction characteristic, which limits the amplitude of negative surges to a forward bias voltage.
Other key electrical characteristics of the LCDA15-1 include a low clamping voltage (less than 24V at 1A peak-peak) and low reverse leakage current (less than 5uA at 15V).
From a mechanical standpoint, the LCDA15-1 features a diminutive SOT-143 package that conserves scarce board space.
Moreover, the chip's pin layout lets the device connect directly across parallel circuit-board traces; a layout that not only simplifies board placement, but also minimises trace inductance.
As an integrated device, the LCDA15-1 not only saves space and cost over discrete approach but is inherently more reliable.
The LCDA15-1 low-capacitance transient suppressor is available now.
Pricing for the device is $0.79 per unit in 10,000 unit quantities.
Products are delivered in tape-and-reel format per EIA 481.
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