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Component Specifier
December 31, 1969 |Estimated reading time: 10 minutes
As SMT matures and its end products continue to shrink in size but grow in capability, manufacturers are constantly in need of components that satisfy demanding footprint, reliability and placement require-ments. Modern manufacturing techniques are useless if a board's components are out of date, perform poorly or fail to satisfy end-user requirements. To assist manufacturers in this search, SMT Magazine presents Component Specifier, a new product section designed to spotlight state-of-the-art active, passive, odd-form and interconnect components.
Interconnect. Devices that provide mechanical and electrical union/disconnection and consist of mating plugs and receptacles (sockets) to join PCBs with cables, racks, chassis or other PCBs (stacking); actual connection to the board, however, must be via surface mount-type contacts.
ActiveDevices capable by themselves of controlling voltages and currents to produce gain or switching actions in analog or digital circuits, i.e., reacting to an applied signal, they can change their basic charater.
PassiveDevices that do not change their character when electrical impulses are applied, i.e., they provide a single, repeatable reaction.
Odd-FormDevices whose geometrical form factors are singular but not necessarily unique such that they must be manually mounted. Their housings (as opposed to their basic functions) are nonstandard as to shape. Examples include many transformers, hybrid circuit structures, fans/blowers, mechanical switching blocks, etc.
ACTIVE
Photodiode ArrayThe OSM960 six-element photodiode array reportedly can be used in incremental encoder applications. The device provides differential, analog outputs for A and B quadrature channels plus an index or marker pulse channel. The signals reportedly are suitable for low- and high-resolution applications. It is housed in a 12-pin, SO-style surface mount package that has a choice of holes or pins for alignment of reticles or masks. The package is rated for operation from -55° to 110°C. The device is said to be suitable for use with encoder disks that are approximately 2" in diameter or greater. Optek Technology Inc., Carrollton, Texas.
Gigabit TransformersNew sizes for two 1000Base-T magnetic modules reportedly allows them to fit directly behind a standard RJ-45 connector. The H5008 and H5009 transformer modules are designed for routers, switches, repeaters, servers and network interface cards operating over traditional copper-based networks. They are single-port modules designed to transmit and receive 1,000 Mb per second over four pairs of Category 5 UTP cable. These products are fabricated in a 24-pin, open-header package specified for convection and IR reflow solder temperatures up to 235°C. Pulse, San Diego, Calif.
High-density DC/DC ConvertersThe AK40A is a compact, high-power density (15 W per in3) converter that operates from either 24 or 48 VDC input, to provide single-output voltages of 1.5, 1.8, 2.1, 2.5, 5.0 or 12 VDC. The AK42 series also addresses the market trend for low-output voltages by providing dual-output voltages of 1.8 and 2.5 VDC, 5 and 3.3 VDC, or 3.3 and 2.5 VDC. It provides a bridge for applications that are transitioning from one voltage to another. The converters feature input differential and common mode filtering, hot-insertable with inrush current limit, input under-voltage lockout with hysteresis, output over-voltage protection, remote shutdown, and load-sharing on dual-output models. The convection-cooled devices feature an operating temperature range from -40° to 75°C with storage temperature tolerance from -55° to 125°C. Astec America Inc., Carlsbad, Calif.
Gate DriversThe 600 V IR2137 and 1,200 V IR2237 are reportedly pin-to-pin and functional equivalent devices for use with 230 and 460 VAC motor drives rated up to 5 hp or 3.75 kW. These three-phase gate driver ICs use a de-sat detection technique at the high-side gate drive to sense short circuits. They are said to provide soft shutdown in the event of a short or ground fault conditions. International Rectifier, El Segundo, Calif.
Lighted SwitchThe HDS/HDT switch series integrates LED and a switch in an SMT process-compatible package. Reportedly, the switch series was developed to withstand the rigors of wave soldering and reflow processes, as well as spray fluxes and water washes. The unit mounts horizontally to the PCB, measuring less than 0.75" in depth. It has momentary- or latch-type switch action in six different electrical variations. The LED has a luminous intensity up to 50 millicandle for green and 32 millicandle for red or yellow. Both switch and LED contacts self-clean as they wipe during actuation. Lighting can be viewed at a wide angle with full actuator illumination or narrowed by adding a cap to channel the beam. Schurter Inc., Petaluma, Calif.
AmplifiersThe CMC7101A is a low-power operational amplifier with a 2.7 V capability. It is housed in a five-pin SOT-23 package. Drawing 300 μA from a 5 V supply, the rail-to-rail input and output op amplifier has a 1 MHz gain bandwidth and 1 V per microsecond slew rate. Its common-mode input range exceeds the rails by 300 mV, while the output can drive greater than 75 mA. California Micro Devices, Milpitas, Calif.
Power SupplyA surface mount power supply, the SM30 is a 30 W DC/DC converter that reportedly can be handled by pick-and-place equipment. Using a 64-pin lead-frame attach and regulating heat dissipation through a PCB material with 10 times the thermal transfer of FR-4, it reportedly eliminates thermal encapsulation and the two-step potting process. The power supply has a surface mount package profile of 0.4" high and a square design of 2.5 x 2.5". The converter features a 10 millisecond startup for hot-plug conditions, remote on/off for system timing requirements, and 24 or 48 V nominal inputs for wireless/cellular and central-office telecom applications. Lambda Electronics Inc., Melville, N.Y.
PASSIVE
RF Chip InductorsThe MRFI Series are miniature RF chip inductors that reportedly have high Q and SRF values. The series are said to have resistance to soldering heat. Available in 0603, 0805, 1008 and 1210 sizes, with a range of inductance from 1 nH to 3.3 μH, these inductors can be operated continuously at rated current over the operating temperature range of 30° to 85°C. Venkel Corp., Austin, Texas.
Voltage DividerThis voltage divider in a SOT-23 package reportedly provides ratio tolerances to 0.05 percent and temperature-coefficient-of-resistance ratio tracking of ±5 ppm per °C. The divider is available in custom resistances for applications such as power supplies, voltage regulators, instrumentation, amplifiers, smart battery modules and battery chargers. International Resistive Co. Inc., Boone, N.C.
VCXOsThe K1526 (5.0 V) and K1536 (3.3 V) Series of surface mount VCXOs have extended frequency ranges to 80 MHz. Deviation linearity is in an average range of ±5 percent. Both series include a B group configured with six J-lead footpads. Their operating temperature range is 0° to 70°C, with -40° to 85°C available as an option. Stability performance is ±25 ppm while delivering a TTL/CMOS compatible output on frequencies ranging from 2 to 80 MHz. The C series has a four J-lead SOJ-20 footprint. This group has the same stability and frequency performance as the B series. Champion Technologies, Franklin Park, Ill.
InductorThe E66 surface mount inductor occupies 0.078 sq. in. of PCB real estate. It can be wound as a common mode choke, a high-Q inductor or a pulse transformer. The inductor provides 1.0 to 1,000 μH of inductance with corresponding current ratings of 150 to 1,000 mA. DCR maximums range between 0.01 and 3.50 W. The devices are wound on ferrite cores with six-leaded bobbins. Winding configurations can be bifilar or separate. Operating temperatures may range between -20° and 105°C. Associated Components Technology Inc., Garden Grove, Calif.
Multilayer Ceramic Chip CapacitorsThe GMC Series consists of MLCCs in sizes ranging from 0402 to 2225. The MLCCs reportedly have stable COG temperature characteristics, excellent frequency characteristics and low ESR. The capacitors are offered in rated voltages of 16, 25 and 50 VDC, and in capacitances ranging from 0.5 pF to 1 μF. Featuring a dielectric strength of 250 percent of rated voltage for five seconds at 50 mA maximum, they are available with NPO/COG, X7R and Y5V dielectrics. Cal-Chip Electronics Inc., Ivyland, Pa.
SMT CrystalsThe 4SMX range of surface mountable crystals has fundamental frequencies from 12 to 67 MHz and a tolerance of ±50 ppm at 25°C. The crystals reportedly are designed to provide the clock frequency in portable applications like PC card interfaces for notebook computer peripherals and mobile communications equipment. The device packaging measures 5.0 x 3.2 x 0.8 mm. C-MAC Frequency Products, Durham, N.C.
ThermistorsPositive and negative "tempco" thermistors are available in sizes from 0603 through 1206 with resistance values from 10 Ω through 150 kΩ. The positive thermistors are designed with TCR from 150 to 450 ppm per °C. The negative have beta constants from 3,200 to 3,800 K. Tolerances of ±2 to 15 percent are available for all thermistors. They are said to have anti-leaching nickel barrier terminations, 90/10 solder-plated terminations, reduced size, lighter weight, 25 specifiable temperature characteristics, 12 standard resistance values, and suitability for reflow and wave soldering. KOA Speer Electronics Inc., Bradford, Pa.
Transformers and InductorsThe SURFCOIL line includes a wide range of fixed and variable surface mount inductors, transformers, coils and filters. Parts are wound as air coils or on a selection of ferrite cores, and can be used up to the GHz frequency range. They operate over a temperature range of -40° to 125°C. Sprague-Goodman Electronics Inc., Westbury, N.Y.
ESD SuppressorThe PulseGuard ESD product line is based on polymer technology. Form factors include surface mountable, discrete single-line packages, and multi-line arrays and connector-based packages. The suppressors have less than 1 pF capacitance, less than 0.1 μA leakage current, less than 1.0 ns response time and 50 V clamping voltage. They are suitable for applications that have 24 VDC or less operating voltage. Littelfuse Inc., Des Plaines, Ill.
Solid-state RelayThe G2-DA06 is a low-profile, surface mountable solid-state relay for modems and data communications applications. The unit is a dual-form A SSR with an 18 Ω on-resistance maximum. It can handle continuous load current of 180 mA, peak load voltages of 250 V, and provides 3,750 Vrms input/output isolation. It has a maximum height of 0.087". Coto Technology, Providence, R.I.
INTERCONNECT
Wireform JumperThe SJ-1206 Series is a dedicated jumper for SMT applications. The jumper can handle a maximum 2 A current. It reportedly offers sufficient clearance for PCB paths and requires no insulation. The jumper is manufactured using copper flat wire and is 90Sn/10Pb plated to a thickness of 0.0001". It is available on 7 or 13" tape-and-reel or in any bulk quantity. Components Corp., Denville, N.J.
Hermaphroditic ConnectorThe Microstac is a SMT hermaphroditic connector available in single-row six and 12 position, and dual-row 50 position (2 x 25 on 0.8 mm center line). Current carrying capacity is 2.0 A at 70°F. The board-to-board stacking dimension is 5.0 mm. All products are available in tape-and-reel packaging. ERNI Components Inc., Chester, Va.
Component Information Portal PlannedThe Electronic Industries Alliance (EIA) and Parametric Technology Corp. (PTC) announced an initiative to develop a new and innovative Internet-based portal designed to provide access to a data center containing thousands of models and millions of technical specifications created and maintained in partnership with leading electronic component manufacturers. n This new program, known as InPart Electronic, will make it easy for electronic design engineers to locate components matching the functional characteristics required for use in product designs. The program is a companion to InPart Mechanical portal, which provides comparable data on mechanical components. EIA will be the technical advisor in the design, development and support of the new electronic component portal, and will assist PTC in marketing InPart Electronic to potential end users. Using a standard Web browser, InPart Electronic subscribers will be able to access information on thousands of components from EIA member companies. Subscribers will be assured that supplier component selections are current, resulting from the portal's ability to provide immediate access to supplier updates, engineering changes and new product releases. Subscribers and participating companies will be able to access the site seven days a week, 24 hours a day. n Dave McCurdy, EIA president, said, "One of our major missions is to knock down competitive barriers faced by the U.S. electronics industry both at home and abroad to make it the most competitive industry in the global marketplace. InPart Electronic will play an important role for our members in removing barriers to timely, accurate and inexpensive electronic component information." n "This partnership," said Steven Walske, PTC's chairman and CEO, "represents PTC's pioneering spirit in addressing fundamental issues facing the competitiveness of the U.S. electronics industry namely, our focus on economically and effectively communicating information about standard electronic components to electronic component manufacturers' suppliers, distributors and end-users. This effort will help eliminate the barriers of proprietary information, the delays inherent in obtaining information, the burdens faced by members' engineering organizations in formulating data for multiple formats, and the concern over the accuracy of the component data among the user community."
For more information, contact the EIA at www.eia.org.