SQ48 DC-DC Series Data Sheet
36-75 VDC Input; 1.0-12 VDC Output
Features
• “G” option designates RoHS for all six substances;
Standard configurations are RoHS compliant with
Pb solder exemption1
• Delivers up to 15 A (50 W)
• Industry-standard quarter-brick pinout
• Outputs available in 12.0, 8.0, 6.0, 5.0, 3.3, 2.5, 2.0,
1.8, 1.5, 1.2, and 1.0 V
• Available in through-hole and SMT packages
• Lowest profile in industry: 0.258” (6.55 mm)
• Lowest weight in industry: 0.53 oz (15 g)
• On-board input differential LC-filter
• Startup into pre-biased output
Applications
• No minimum load required
• Telecommunications
• Data communications
• Wireless communications
• Servers
• Meets Basic Insulation requirements of EN60950
• Withstands 100 V input transient for 100 ms
• Fixed frequency operation
• Fully protected
• Remote output sense
• Positive or negative logic ON/OFF option
Benefits
• High efficiency – no heat sink required
• Output voltage trim range: +10%/−20% with
industry-standard trim equations (except 1.2 V and
1.0 V outputs with trim range ±10%)
• For output voltages ranging from 3.3 to 1.0 V, 40%
higher current capability at elevated temperatures
than most competitors' 20-25A quarter-bricks
• High reliability: MTBF = 3.4 million hours, calculated
per Telcordia TR-332, Method I Case 1
• Extremely small footprint: 0.896” x 2.30” (2.06 in2),
40% smaller than conventional quarter-bricks
• UL60950 recognized in US and Canada and
DEMKO certified per IEC/EN60950
• Designed to meet Class B conducted emissions per
FCC and EN55022 when used with external filter
• All materials meet UL94, V-0 flammability rating
Description
The SemiQ™ Family of dc-dc converters provide a high efficiency single output in a size that is only 60% of
industry-standard quarter-bricks, while preserving the same pinout and functionality.
In high temperature environments, for output voltages ranging from 3.3 V to 1.0 V, the thermal performance of
SemiQ™ converters exceeds that of most competitors' 20-25 A quarter-bricks. This performance is accomplished
through the use of patent-pending circuit, packaging, and processing techniques to achieve ultra-high efficiency,
excellent thermal management, and a very low body profile.
Low body profile and the preclusion of heat sinks minimize airflow shadowing, thus enhancing cooling for
downstream devices. The use of 100% automation for assembly, coupled with advanced electronic circuits and
thermal design, results in a product with extremely high reliability.
Operating from a 36-75 V input, the SQ48 Series converters provide any standard output voltage from 12 V down
to 1.0 V. Outputs can be trimmed from –20% to +10% of the nominal output voltage (±10% for output voltages
1.2 V and 1.0 V), thus providing outstanding design flexibility.
With a standard pinout and trim equations, the SQ48 Series converters are perfect drop-in replacements for
existing quarter-brick designs. Inclusion of this converter in new designs can result in significant board space and
cost savings. In both cases the designer can expect reliability improvement over other available converters
because of the SQ48 Series’ optimized thermal efficiency.
1 The solder exemption is for customers choosing to use the exemptions for lead in solders for servers, storage and storage array systems, and
network infrastructure equipment for switching, signaling, transmission, and network management for telecommunications.
REV. SEP 14, 2005
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