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For 40 years TTI has been a global leader in supplying resistive products from the world’s premier resistor manufacturers. Our product knowledge, breadth of inventory and unmatched supplier relationships are some of the reasons why TTI is the most preferred distributor of passive components according to recent Electronic Buyer News surveys. We can provide a full range of manufacturer-authorized component value-added services. No other company offers the unique combination of benefits that TTI provides. We maintain an extensive inventory of Wirewound, Film, Current Sense, Metal Foil, Metal Oxide Resistors and Resistor Networks and Arrays from the industry's finest manufacturers.
The team of specialists at TTI has more experience in test and measurement products than any other distributor. All TTI employees participate in company-wide training programs, which have helped create the most product-knowledgeable team in the industry. Additionally, customers can rely upon the TTI sales team as a valuable resource of information and guidance. When you partner with TTI you gain access to unmatched product knowledge and inventory availability. Resistors have been an important part of TTI’s success and we look forward to supporting your resistor requirements.
Featured Resistor Products
VFR surface-mount precision resistors are available in various SMD packages and in flip chip, bare chip, and fixed resistor network configurations.
Precision resistors built on VFR's unique Bulk Metal® Foil technology provide very low temperature coefficient of resistance (TCR) and exceptional long-term stability even in extreme temperatures. The devices provide a wide range of resistance values, with any resistance value within their given range available at any tolerance.
Low noise trimmers featuring precision adjustment and stability against mechanical vibration or temperature variations.
Bulk Metal® Technology High Precision, Current Sensing, Power Surface Mount, Metal Strip Resistor with Resistance Value from 1 mΩ, Rated Power up to 3 W and TCR to 0 ± 15 ppm/°C Maximum
// Posted by:
Dennis M. Zogbi
The global passive electronic component industry, which for the purposes of this article includes capacitors, linear and non-linear resistors and discrete inductors of all types and configurations, accounted for approximately $26 billion USD in global revenues for FY 2015 (Fiscal Year ending March) with almost 3.5 trillion pieces shipped. Keep reading...
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Amid an ongoing tidal wave of mobile phone and portable Internet of Things (IoT) development (such as wearables), designers are being challenged to fit greater functionality into smaller form factors, with every square millimeter of a PCB becoming precious. Keep reading...
// Posted by:
Dennis M. Zogbi
The Passive Component Raw Material Index (which covers feedstock pricing for many of the primary raw materials consumed in the production of passive electronic components) showed a DECREASE in JUNE on a month-to-month basis of (2.9%) following month-to-month DECREASES in pricing all year. Keep reading...
Resistors are available at TTI Inc. from industry leading manufacturers. TTI is an authorized distributor for many resistor manufacturers including: Bourns, IRC / TT electronics, KOA, Ohmite, Panasonic, TE Connectivity, Vishay and Yageo.
Carbon Composition Resistor
Carbon composition resistors
are used in applications where there are no stringent requirements for resistance tolerance, temperature stability or low noise. They are used where instantaneous surge currents are present since they are capable of safely handling sudden overloads of current and power for a short time. Carbon composition resistors (carbon comps) are components which use a mixture of carbon and fillers to form the resistive unit. These resistors are called hot molded units because the resistive material, the insulating material and lead wires are all molded at one time into a solid structure. Carbon composition resistors were the state-of-the art resistors during the early aviation and space days, but because of the loose tolerances and environmental vulnerability associated with carbon comps and the erosion of metal film prices, their popularity has decreased. The main use for carbon comps today is in existing designs.
Carbon Film Resistor
Depositing carbon in film form onto a ceramic core creates carbon film resistors
. Due to their low cost, carbon films are primarily used in general-purpose applications such as consumer products. Although they offer a slightly better temperature coefficient than carbon composition, they have a tendency to generate more noise.
Current Sense Resistors
Current sense resistors
are used to monitor the current in a circuit and translate the amount of current in that circuit into a voltage that can be easily measured and monitored. This type of resistors generally have a low ohmic value, low EMF, high current capability, low inductance and have excellent frequency response.
Metal Film Resistor
Metal film resistors
are composed of a resistive metal film deposited on, or inside of, an insulating cylinder or filament. Metal film resistors are used in all applications that require a tighter tolerance and temperature coefficient than is offered by carbon resistors. They are the most widely used resistors in today's marketplace because they are more precise than carbon comps at approximately the same price. There are three basic sizes for metal film resistors: 1/8 wattage package size, 1/4 wattage package size and 1/2 wattage package size.
Metal Foil Resistors
Metal foil resistors
are used in applications that require very precise resistance values that will not vary with temperature changes. Among the many unique characteristics of metal foil resistors are their extremely low temperature coefficients and their extremely low tolerances. Metal foil resistors are made by placing a very thin piece of metal onto a ceramic wafer, then photochemically etching a resistive pattern on the foil.
Metal Oxide Resistor
Metal oxide resistors
are a type of power metal film resistor. They typically are specified for applications requiring 1 to 2 watts, though they are available up to 9 watts.
Resistor chip arrays
are simply a group of flat chip resistors that are not separated. They are available in two package styles, concave and convex.
are a combination of resistors arranged and interconnected in a single package. The resistors can be arranged in series or parallel or a combination of the two. Network packaging variations are Single In-Line Package (SIP), Dual In-Line Package (DIP), flat pack, and surface mount. Resistor networks are available in two basic styles: thick film and thin film. The thick film network has gained acceptance as the preferred component.
Thick Film and Thin Film Chip Resistor
Commercial chip resistors
have become the "standard" resistor callout for new designs as the need for smaller components has become apparent. Resistor chips are manufactured using either "thick film" or "thin film" techniques. Thick film chips are made by specially formulated inks or pastes, which are silk-screened and fired onto a ceramic substrate. The chip is coated with a thin varnish or glaze. A "thin film" chip is manufactured by vacuum depositing a metal film onto a ceramic substrate. Thin film devices are more stable and precise than thick film, although the thick film is more common and can be rated at a higher wattage.
are made by winding high-resistance metal alloy wire around a ceramic core. Wirewound resistors are available up to 250 watts in standard application and can be fan-cooled or water-cooled in order to withstand even more power. Wirewound resistors are used for both high power applications, or where the need for ultra-precision resistors exists.
Questions to Ask
- Physical dimensions
- Operating temperature
- Ohmic value
- Packaging requirements
- Termination styles/materials