High Voltage Resistors

Token high voltage resistors offer rugged, reliable bulk, ceramic glaze glass type and custom design - to meet the extreme energy consumption requirements of the most demanding applications. Products extend a complete line for both military and commercial applications.

High Precision Resistors

Token precision resistors are primarily designed for precised equipments and conform to the RoHS directive and Lead-free. These devices can be customed designs and tighter tolerances available on request. Application of specific designs also available including different power wattage and ppm specifications adjusted to resistance requirements. Utilizes the latest thin film technology enabling the most cost-effective designs with low stand-alone temperature coefficient and resistance tolerance. Token Passive Electronics offers ultra accurate mold, network, coated, and melf resistors with more stability, moisture proof, low TCR, compacted size meets MIL-R-10509, MIL-R-55182, and other military grade.

Current Sense Resistors

Token current sensing resistor (low ohmic) that provides super low resistance and suitable for high power AC/DC detection of power supply circuit. All low ohmic power type are non-inductive type and custom-made products.

Melf Resistors

Token Passive Electronics offers MELF resistors with more stability, moisture proof, low TCR, compacted size meets MIL-R-10509, MIL-R-55182, and other military grade.

Chip Resistors

(PWR), (AR), (PR) thin film chip resistors are formed by vacuum depositing a resistive alloy on a usually flat substrate of ceramic. Photo-lithographic or similar techniques are used to define the final geometry and interconnecting traces. Thin film technology provides for close ratio matching and tracking in a network, as well as low stand-alone temperature coefficient and resistance tolerance. Thick film Type includes Thick Film Chip High Voltage Resistors (HVR), precision (FCR), array (RCA), and networks (RCN).

TO-220, TO-247 Resistors

TO-220, TO-247 Resistors (RMG) series are precision power-film resistive element encapsulated in the TO-220, TO-247 package. Those devices are manufactured in 20W, 30W, 35W, 50W and 100W. Resistive element is electrically insulated from metal heat sink mounting tab. When properly mounted Token's RMG** TO220/TO247 package provides up to 50/100 watts of steady state power. These very low inductance resistors are ideal for many industrial applications: power supplies, power controls and inrush/bleeder resistors.

Resistors Application Notes

Resistor Glossary

Resistors - Glossary Reference Page. Resistor Glossary - PDF (333KB)

What is a "Resistor" ?

Resistor is electrical or electronic components which resist the flow of current across the resistor device. What is a "Resistor - PDF (580KB)

Token Resistor Color Coding And Marking System

Resistors color coding system applies coating resistors of the axial lead type. This system is employed for resistors when the surface area is not sufficient to print the resistance value for the past time. Token Color Code System - PDF file (396KB)

Resistor Lead Forming and Dimensions

Token through hole resistors can be supplied with various pre-formed leads for manual insertion, automatic axial insertion with standoff, or pitch reduction. For more details on dimensions, please see individual datasheets. Forming Type and Dimensions - PDF file (280KB)

Resistor Precautions in Use

Precautions Usage - When an ambient temperature exceeds a rated ambient temperature, resistors shall be applied on the derating curve by derating the load power... Precautions in Use - PDF file (319KB)

High Voltage Resistors - General Information

Token high voltage series can be specified for use in industrial and general purpose high voltage systems, as well as a complete selection of high resistance, Hi-Meg, high-voltage, high frequency, and bulk ceramic resistors for higher average power dissipation. Information of High Voltage Resistors - PDF (235KB)

High Voltage Resistors, High Voltage Dividers - Terminology & Glossary

Terminology Glossary of High Voltage Resistors. (Cermet, Critical Resistance Value, Derating Curve, Maximum Working Voltage, Noise, Power Rating, etc.) Terminology Glossary of High Voltage Resistors - PDF (402KB)

Precision Resistors - General Information

Token is equipped to design and produce custom components to meet many design and reliability demands.Token's line of high-reliability and precision products reflects a long-term commitment to our industrial and military customers. Information of High Precision Resistors - PDF (208KB)

Precision Resistors - Glossary of Resistor Terminology

Glossary of Resistor Terminology. (Absolute Tolerance, Absolute TCR, Temperature Coefficient of Resistance (TCR), Voltage Coefficient of Resistance (VCR), ect.) Glossary of Resistor Terminology. - PDF (389KB)

Design Guide for Precision Resistive Devices

Even in this digital age, a number of measurement and instrumentation applications rely on the accuracy of the value of one or more resistors. To guarantee the performance of the system, the designer must understand what factors can affect the value of a precision device, and how the combined effect of these factors may be evaluated. Design Guide for Precision Resistive Devices - PDF (266KB)

Current Sense Resistors - General Information

As the world becomes more and more technology-driven, the uses for current sensing components will continue to increase. The need for even lower resistance value ranges is already becoming evident, as is the need for these resistors to handle more power. Information of Current Sensing Resistors - PDF (220KB)

How to Design & Select Current Sense Devices

the following information is required to effectively design a current sensing resistor: Point 1 - Power Rating, Point 2 - Resistance Value,
Point 3 - Temperature Coefficient of Resistance (TCR), Point 4 - PCB Layout, Point 5 - High Frequency Applications, Point 6 - High Heat Dissipation. How to Design & Select Current Sense Devices - PDF (250KB)

Current Sense Resistors - Terminology & Glossary

Terminology Glossary of Current Sensing Resistors. What is a "Current Sense"? Current Detecting Resistors. How 4-Terminal Resistor Works.
Flip Chip Resistors, Hot-Spot Temperature, Hot-Spot Temperature, Low Profile, Maximum Working Voltage, PPM, ect. Terminology Glossary of Current Sensing Resistors - PDF (263KB)

MELF Resistors - General Information

Token is now offering the complete range of MELF products, comprising DIN-0411, DIN-0309, DIN-0207, DIN-0204 and DIN-0102. These high stability, close-tolerance MELF resistors have a footprint very close to comparable chip resistors but maintain their tolerance and deliver higher stability over a wider temperature range. Information of MELF Resistors - PDF (215KB)

MELF Resistors - Terminology & Glossary

Derating Curve, Dielectric Withstanding Voltage, Maximum Overload Voltage, Maximum Working Voltage, Power Rating, Rated Ambient Temperature, etc. Terminology Glossary of MELF Resistors - PDF (240KB)

TO-Style Power Resistors - General Infornation

Token Electronics TO-Style power film heat sink mountable resistors, TO-220 and TO-247 Style Packages, are designed for intermediate power applications and combines performance with an economical price. Information of TO-Style Power Resistors - PDF (213KB)

Application Guide for Heat Sink Mountable Power Film Resistors

Understanding Temperature and Power Rating, Assembly of Thermal Material, Selection of Hardware Assembly, Assembly Considerations. Heat Sink Mountable Resistor Application Guide - PDF (250KB)

Chip Resistors - General Information

Token electronics provides the industry’s most comprehensive range of precision thin film technologies for discrete, network, and integrated passive components used in instrumentation; automotive electronics; communications systems; and portable electronics applications. Information of Chip Resistors - PDF (208KB)

Surface Mount Terminology & Glossary

Selecting the optimum chip technology necessary to best match the performance requirements, The Difference between Thin Film and Thick Film Chips, ESD Sensitivity of Chips, Temperature Coefficient of Resistance (TCR), Maximum Working Voltage, Power Rating, Rated Power, Rated Voltage. Surface Mount Terminology & Glossary - PDF (398KB)

Surface Mount Component Application Notes

Surface Mount Component Application Notes. (Safety Precautions, Precautions for use, Precautions for storage.) Surface Mount Component Application Notes - PDF (222KB)

Power Resistors - General Information

Token provide terminal blocks, thermal switches, fusing, fans, junction boxes, screened or solid bottom plates, conduit knockouts, and customer specified requirements.
For large applications a welded frame construction is utilized to provide a robust design for power resistor mounting in both indoor and outdoor environments. Information of Power Resistors - PDF (247KB)

Wire Wound Terminology & Glossary

Wire Wound Terminology & Glossary. (Ayrton-Perry Winding, Ayrton-Perry Winding, Neutral Grounding Resistor, Rated Continuous Current, etc.) Wire Wound Terminology & Glossary - PDF (238KB)

Adjustable Resistor Application Notes

Determination of End Resistance Value of FVR, DQS, DSRA, DSRB, BSR, BSQ. Power Rating of Adjustable Resistor. Adjustable Resistor Application Notes - PDF (206KB)

General Purpose Resistors - General Information

Token Electronics is expanding business to include a broad range of General Purpose Resistor products designed for high volume applications. Information of General Purpose Resistors - PDF (214KB)

Resistor Glossary & Terminology

Fusible Resistor, Thermal Cutoff Resistor, Anti-Surge Resistor (RCR), Light Dependent Resistor (LDR), etc. Resistor Glossary & Terminology - PDF (219KB)

Select Optimum Resistors

Select Resistors With Optimum Technology to Best Match The Performance. Select Optimum Resistors - PDF (234KB)

Resistor Glossary & Terminology

Fusible Resistor (Fuse Resistor, Circuit Protect Resistor)
A resistor designed to protect a circuit against overload; its resistance limits current flow and thereby protects against surges when power is first applied to a circuit; its fuse characteristic opens the circuit when current drain exceeds design limits.

Thermal Cutoff Resistor
A thermal fuse is a cutoff which uses a one-time fusible link. Unlike the thermostat which automatically resets itself when the temperature drops, the thermal fuse is more like an electrical fuse: a single-use device that cannot be reset and must be replaced when it fails or is triggered. A thermal fuse is most useful when the overheating is a result of a rare occurrence, such as failure requiring repair (which would also replace the fuse) or replacement at the end of service life.

Token offers "Thermal Cut-off Resistor", a thermal Cut-offs is a fusible alloy and a resistor is a voltage divider, both are surrounded by a ceramic cement with special resin. Under normal operating temperatures the fusible alloy joins the two lead wires within the body of the cutoff and the power resistor acts as a normal function resistor. When the preset temperature of the cutoff is reached, the fusible alloy melts and with the aid of the special resin, complete cutoff is ensured.

Thermal fuse resistors are usually found in heat-producing electrical appliances such as coffeemakers and hair dryers. They function as safety devices to disconnect the current to the heating element in case of a malfunction (such as a defective thermostat) that would otherwise allow the temperature to rise to dangerous levels, possibly starting a fire.

Anti-Surge Resistor (RCR)
Surges in electronic circuits are caused by internal conditions — switching operations from other electronic components or due to external conditions on the AC power mains — switching operations in the power grid or from nearby lightning strikes, either directly to the power distribution system or to nearby ground. Electronic products have to be surge immune to ensure their continued reliable operation if subjected to realistic levels of surge voltages, and they are required to comply with safety requirements. Token's RCR series is a perfect fit when an anti-surge resistor is required.

Light Dependent Resistor (LDR)
A photoresistor or light dependent resistor or cadmium sulfide (CdS) cell is a resistor whose resistance decreases with increasing incident light intensity. It can also be referenced as a photoconductor.

A photoresistor is made of a high resistance semiconductor. If light falling on the device is of high enough frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the conduction band. The resulting free electron (and its hole partner) conduct electricity, thereby lowering resistance.

Carbon Composition Resistor (CCR)
CCR is made up of a solid rod of conductive composite material, the chemical composition of which is altered to produce different resistance values. The general composition consists of the carbon conductor and Ceramic filler materials. By altering the ratio of filler to conductor it is possible to change the resistance value. Interference-fit end caps are attached to the rods, leads are welded onto these caps, and the resistor body is then protected with a specially formulated epoxy coating. The resistors are then colour code marked.

Ayrton-Perry Winding
Winding of two wires in parallel but opposite directions to give better cancellation of magnetic fields than is obtained with a single winding.

Wirewound technology has long been known as a leading technology for power resistor needs. The most critical drawback with this technology is that it is inherently inductive. This is logical given that a wirewound inductor and a wirewound resistor are made with essentially the same materials and processes. This fact limits the use of wirewounds for applications with high switching speeds, which require low inductance.

Now the same standard wirewounds can be used for these applications by using a non-inductively wound version. This manufacturing method greatly reduces the inductance of any given resistor size and value combination, however it does not completely eliminate the inductance. A non-inductively wound wirewound has one winding in one direction and one in the other direction; known as Ayrton Perry winding. This non-inductive winding is available in all Token standard wire-wound resistor series.

Typical RoHS Reflow Profile

Typical RoHS Reflow Profile
Typical RoHS Reflow Profile

All Token RoHS-compliant parts are backward compatible with tin-lead soldering processes. Soldering temperature must be greater than 230°C to ensure proper melting of lead-free solder.

For all soldering methods, the optimal reflow profile for a circuit board assembly is dependent on the solder material, solder amount, flux, temperature limit of each soldered component, heat transfer characteristics of the circuit board and component materials, and the layout of all components. The temperature versus time limitation of the least robust component of the circuit board assembly ultimately may determine the actual temperature profile that must be used. For these reasons, Token does not specify soldering profiles for our components.

This typical reflow profile is based on IPC/JEDEC J-STD-020 Revision D.1 (March 2008). It is provided only as a guide.

For additional information, refer to these web sites:

Typical RoHS Reflow Profile - PDF (267KB)