Suiting use with National Semiconductor’s Simple Switcher step-down voltage regulators, this line of inductors gives you a choice of 34 models for pc-board mounting. All units meet UL Class B 130°C requirements and withstand wave or IR soldering and solvent baths. The 415 series uses a ferrite core and glass-filled nylon bobbin, and the 418 series features powdered-iron toroids. From $0.90. C&K Components Inc, Watertown, MA. (617) 926-6400.
Built with gapped ferrite cores, the VMGPT vertical-mount power toroidal inductor comes in 29 values ranging from 5.6 to 1200 µH and six sizes, as dictated by inductance. Standard inductance tolerance is ±10%. Devices operate over the military temperature range of –55 to +125°C. Prices start at <$6.50 (1000). Engineered Components Co, San Luis Obispo, CA. (805) 544-3800.
With a package height of just 0.172 in., the SM73628 surface-mount transformer fits neatly on PCMCIA V.34 fax/modem cards. Key specifications include a frequency response of ±0.25 dB maximum from 300 to 3500 Hz and THD of –82 dB maximum at 600 Hz. Nominal impedance is 600[ohm] at 1 kHz and 1V with 294[ohm] termination at the secondary. The SM73628 costs <$1 (100,000). Datatronics Inc, Romoland, CA. (909) 928-7700.
Requiring less board space than SOT-23 devices, JEDEC transistors in the SOT-323 package let you downsize circuits with minimum redesign. Industry-standard devices available in the SOT-323 include 2222A, 2907A, 3904, 3906, 4401, and 4403 types. From $0.05 (1 million). Rohm Corp, Electronics Division, Antioch, TN. (615) 641-2020.
With ratings of 350 and 400V dc, the MLP series of capacitors can put 25J of energy storage on the dc input bus of a switch-mode power supply in 0.5 in. of height. These higher voltage additions to the MLP line come in 0.5×1.75×3- and 0.5×1.75×1.5-in. case sizes. Capacitance values for the line range from 150 to 47,000 µF, and voltage ratings start at 7.5V dc. Prices range from $8 to $10 (1000). Cornell Dubilier, Liberty, SC. (803) 843-2277.
Surface-mount and through-hole inductors operate with National Semiconductor’s Simple Switchers family of 150-kHz step-down converters. The inductor line comprises >80 models ranging from 17 to 377 µH (part numbers PE-53801 through PE-53589S), covering converter output currents from 0.5 to 3A. Inductor prices range from $1 to $3 (1000). Pulse Engineering Inc, San Diego, CA. (619) 674-8100.
Epoxy-encapsulated chip inductors in the GLY series measure 1.6×0.8×0.8 mm (EIA size 0603). The 17 surface-mount devices in the series cover an inductance range of 2.2 to 47 nH. Standard tolerance is ±5%. GLY inductors offer high Q at microwave frequencies and have a high self-resonant frequency of up to 3200 MHz. The parts cost $0.41 (3000-piece reel). Sprague-Goodman Electronics Inc, Westbury, NY. (516) 334-8700.
Employing a precious-metal brush contact with 26 contact points, G12 single-turn trimming potentiometers have a power rating of 0.75W and a resistance range of 100[ohm] to 1 M[ohm]. Working voltage is 300V dc. Top-adjustable units are 0.450 in. wide and 0.248 in. high; side-adjustable versions are 0.450 in. wide and 0.571 in. high. G12 devices cost $1.46 (1000). Tocos America, Schaumburg, IL. (708) 884-6664.
A compact alternative to discrete solutions, an EIA size 0805 RC monolithic chip increases board yields by reducing component count and solder joints. You can mount the leadless RC3 on edge connectors and solder the chip near active devices for optimal performance at high frequencies. Prices range from $0.05 to $0.06 (1 million). BI Technologies, Fullerton, CA. (714) 447-237.
Requiring just 6 sq cm of pc-board area, the PMD current-sensing resistor is rated at 2W with resistance values from 10 m[ohm] to 2[ohm] and tolerances of ±1 or ±5%. The device’s single-plane design results in inductance of <10 nH at 100 m[ohm] and long-term stability. The price of a 10-m[ohm] device with ±5% tolerance is $0.74 (10,000). Isotek Corp, Swansea, MA. (508) 673-2900.
Six voltage ratings, ranging from 6.3 to 50V dc, are available for the Type MXZ aluminum electrolytic capacitors. Capacitance ranges from 0.47 to 150 µF with a capacitance tolerance of ±20 or ±10%. The cylindrical, leadless devices boast a maximum height of 5.5 mm in one of three case sizes: 4×5.5, 5×5.5, and 6.3×5.5 mm. From $0.197 (10,000). Tecate Industries Inc, El Cajon, CA. (619) 448-4811.
The Multipac line squeezes three magnetics into one surface-mount package for multiple applications. Depending on the configuration, the Multipac works as a 1-to-1 transformer, a single high-inductance/low-current inductor, or a dual-power inductor. It costs $1.75 (10,000). Excel Electric Corp, Plantation, FL. (305) 581-2330.