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Components Showcase

Surface-mount EMI suppressor hits high impedance.

Able to suppress EMI radiation, the MCB-1206 provides impedances as high as 500V at 100 MHz in a standard EIA 1206 package. Maximum rated current is 200 mA, and dc resistance is 1V. Both operating and storage temperatures range from –55 to +1258C. The components, which come on a 178-mm paper reel with 3000 devices/reel, cost $0.11 (100,000).
Associated Components Technology, Garden Grove, CA. (714) 636-2645.

Quad suppressor saves board space.

These surface-mount transient-voltage suppressors contain four junctions in a single six-pin SC-59 package for automated board assembly. The devices reduce insertion costs and conserve board space. The quad-junction monolithic common-anode design of the devices protects four lines against ESD. The MMQA5V6T1 comes in two voltages and contains four 5.6V junctions, and the MMQA20VT1 provides four 20V junctions. Both devices have 24W pk power at 1-msec unidirectional waveforms. They come taped and reeled and cost $0.21 each (3000 devices/reel).
Motorola Semiconductor Products Sector, Phoenix, AZ. (602) 244-5902.

Diode array clamps as many as six signal lines.

The DA112S1 comes in an SO-8 package and contains 12 diodes configured as six cells of two series-connected diodes for protecting as many as six high-speed transmission lines from damaging voltage transients. Each of the DA112S1's 12 diodes withstands a peak reverse voltage of 18V, enabling you to use the device to protect signals in 3, 5, and 12V systems. Repetitive peak forward current is 12A (8/20-msec surge). The diodes also have a <35-pF capacitance. The DA112S1 costs $0.59 (100,000).
SGS-Thomson Microelectronics, Lincoln, MA. (617) 259-0300.

Ferrite chip beads vanquish EMI.

Ultra-high-loss ferrite chip beads provide EMI noise suppression in standard 0603, 0805, 1206, and 1812 packages. The BK and FBM families are available in standard impedances and a range of current ratings. The devices cost <$120/1000 units (50,000).
Taiyo Yuden (USA) Inc, Arlington Heights, IL. (847) 364-6104.

Power conditioners offer isolated outputs.

Expanding its range of Kleen-Line power conditioners, the vendor now offers 10 regulator-isolator models and 15 isolation transformer systems that are sized to accommodate all point-of-sale stations, color and high-speed copiers, dedicated computers, and industrial equipment. In addition to isolated output stages, the units provide heavy-load start-up capability and seven-stage electrical spike and surge suppression. Regulator models hold the output at 117V ac ±4% for a 90 to 140V ac input range. Isolation and regulator models carry ratings from 75 to 2500 VA. Select models offer 250V ac operation. Prices start at $120. Electronic Specialists, Natick, MA. (508) 655-1532. Circle No. 549

Transient suppressor aids IEC-801 compliance.

Surface-mount TransGuard transient-voltage-suppression devices help bring your system into compliance with electromagnetic-compatibility directives. The monolithic, multilayer, ceramic varistors offer bidirectional ESD protection as low as 3.6V, response times of 200 to 700 psec, and multiple-strike capability of >50,000 strikes. TransGuards come in EIA chip sizes ranging from 0603 through 1210. Inductance is <1 to 3.5 nH; capacitance is <100 pF. Typical price for a 1-J 0805-size device is $0.162 (50,000).
AVX Corp, Myrtle Beach, SC. (803) 496-0244.

Circuit protector sits in DO-35 package.

With dimensions of 4.631.8 mm, this through-hole circuit protector conforms to the DO-35 outline, as EIA/JEDEC Publication 95 details. The protector captures each chip between axial leads and encapsulates them in glass. The DO-35 devices offer voltage ratings of 32V ac/dc and current ratings of 250, 375, 500, and 750 mA and 1, 1.5, 2, 3, and 3.5A. All parts are color-coded according to current rating and meet UL and CSA requirements. The circuit protectors cost $0.085 (OEM).
Bussmann Division of Cooper Industries, St Louis, MO. (314) 394-2877.

Electroconductive plastic housings ward off EMI/RFI.

The JITshield family of plastic housings protects electronic components against the effects of broad-spectrum electronic noise and offer a lightweight alternative to solid-metal housings. A matrix of ultrathin stainless-steel filament elements permeates the plastic material, making shielding an integral part of the housing. Shielding characteristics depend on the thickness of the housing wall but typically offer a 40-dB reduction. The price for a Series C Model CC/JS housing, which measures 2.63331.7532.75 in., is $1.39 (144).
JIT Components Inc, Tampa, FL. (813) 855-5736.

Card monitors ac power line for overvoltage and undervoltage.

Comprising a battery-powered PIC16C71 mP on a 4333/8-in. pc board, the Model SPPC-3 controls an off-card, solid-state relay that disconnects the load if the ac power-line voltage leaves programmed limits. Voltage limits are 200 to 240V when you set the jumper for 220V operation and 210 to 250V when you select 230V operation. The power available for the controlled relay is 5V dc at 6 mA maximum. Load current depends on the relay rating. The circuit automatically resets itself and reconnects the load 90 sec after the line voltage returns within limits. The Model SPPC-3 type 3 pc board costs $38.
TDL Electronics Inc, Las Cruces, NM. (505) 382-8175.

Overvoltage array protects six lines.

Replacing 12 discrete diodes, the SP723 array of 24 transistors in a silicon-controlled rectifier configuration protects as many as six lines from 15-kV ESD. The array offers full suppression to Level 4 of the IEC 1000 standard (IEC 1000-4-2). Switching in <6 nsec, the SP723 handles 7A pk current and a single 100-msec pk transient of ±4A. The SP723 comes in eight-pin plastic DIPs and SOIC packages and costs $1.10 (1000). SOIC versions on tape and reel cost $1.14 (1000).
Harris Semiconductor, Melbourne, FL. (800) 442-7747, ext 7478.

Hydraulic circuit breakers offer broad options.

The 8300 series offers hydraulic magnetic circuit breakers in three frame sizes covering current ratings from 50 mA to 100A at voltage ratings to 440V ac and 125V dc. Configuration options include as many as six poles; panel, snap-in, and DIN-rail mounting; paddle, baton, rocker, and toggle handles; and illumination. Applications range from marine distribution panels, instrumentation, and power supplies to plant automation and signaling control circuits. Prices range from $4.50 to $30.
E-T-A Circuit Breakers, Mount Prospect, IL. (847) 827-7600.

Surge suppressors handle as much as 720J.

PowerTracker surge suppressors come in three configurations, including plug-strip and wall-mount, and provide three levels of surge protection. The standard model is rated for 360J with a let-through voltage of 150V, and the high-end maximum model handles 720J with a let-through voltage of only 10V. The PowerTrack devices provide EMI/RFI noise reduction as high as 99.99%. Prices range from $23.99 to $105.99 for plug-strip units; $34.99 to $67.99 for wall-mounts; and $38.99 to $115.99 for specialty and floor-mount models.
EFI Electronics Corp, Salt Lake City, UT. (801) 977-9009.

Ceramic gas tubes guard against electrical transients.

A line of ceramic surge-arrester gas tubes protects telecommunications and data-communications equipment from electrical transients from industrial overvoltages, lightning surges, inductive switching, and ESD. Units are available with breakdown voltages from 75 to 5000V and high-energy-dissipation characteristics from 5 to 100 kA. The two- and three-electrode, ceramic gas tubes come in various sizes, including a surface-mount micro tube. Prices range from $0.30 to $0.90.
Citel America Inc, Miami, FL. (305) 621-0022.