New Product Introductions
Ohmite introduces a 140 watt resistor inside a TO-247 package. The TEH140 expands on the existing TEH100 series, offering a higher wattage TO-247 package when properly heatsinked.
Ohmite is expanding it's growing line of Heatsinks. The Ohmite PA/PV series heatsinks use forged pin construction. The thermal efficiency of a heatsink is determined by many variables. One of the main variables is the surface area. The pin fin construction of the PA/PV series produces more surface area than the standard extruded designs. In addition to the increased surface area the pin fin design also allows air flow to be entered from multiple directions. Standard extrusion heatsinks only allow airflow along the fins of the heatsink. With the ability to flow air in multiple directions the designer is released from restrictions typically associated with extrusion based heatsink designs.
The FCSL offering extends to two new sizes. The FCSL20 and the FCSL32 have been added to the FCSL platform increasing options for the part series. The FCSL20 and FCSL32 correlate to 0508 and 0612 sizes with the terminations located on the long edge for increased current handling.
Ohmite extends the tolerance offering for the FCSL series. The tolerance of 0.5% is now avaiable across the product line. This new tolerance offers a higher degree of accuracy for design engineers with more exacting needs.
Using a metal alloy strip as the resistive medium, the TCR’s are kept at low levels. TCR’s range from 150ppm to 50ppm depending on the value and size chosen. All popular sizes and values are covered with this series. Sizes include 0402, 0603, 0805, and 1206. These sizes are available from 2 milli-ohms up to 20 milli-ohms producing a nice range for current sense applications looking to minimize power consumption. The Ohmite LVT series is constructed in a Flip Chip style providing an economical current sense chip and a great extension to the ever-expanding offering from Ohmite.
Ohmite D Series heatsinks provide an innovative solution for SMT compatible semiconductors and resistors. The unique design (Patent Pending) combines tin plated, solderable rods with an aluminum extruded heat sink body. These rods (or “rollers”) are mated mechanically to the heatsink by forging to reduce the thermal resistance between the heatsink body and the solderable feet.
Designed to replace any TO-252 package. The TKH45 is rated at 45 watts with a thermal resistance of 3.0°C/W in a surfacemount design capable of high wattage dissipation with the proper heatsink and thermal considerations. The Ohmite D series heatsinks with the TKH45 presents a complete solution for your surfacemount wattage requirements. The thick film construction enables non-inductive performance and is suited for pre charge and snubber applications. Other key design features include:
- Elimination of multiple thermal layers including metal header for greater thermal performance.
- No wire bonds or molding for increased reliability.
- Larger resistance area for increased surge handling.
Due to their non-inductive design, these resistors are ideally suited for high-frequency and pulse-load applications. Available in 120- or 200-watt sizes, this resistor is designed for direct mounting onto a heatsink. Popular applications include variable speed drives, power supplies, control devices, telecom, robotics, motor controls, and other switching designs.
The SMU series offers a maximum power dissipation of 1/4 watt. The SMU is designed to keep the lowest profile. This is done by having the adjustment location on the top of the potentiometer. The adjustment of the full range of resistance can be accomplished with a single turn. This provides the user with a quick adjustment. The adjustment can also be completed with either a flat head or “Phillips” screw driver, adding another layer of ease for the user. The SMU series is offered in standard values from 50 ohms up to 2M ohms and the outer casing meets UL 94V-0 requirements.
January 2018The Ohmite FSR Series (Force-Sensing Resistors) exhibit the unique characteristic of dynamic resistance related to the amount of applied force. In general applications, the more force applied to the surface of the sensor, the lower the resistance. The resistance change is inversely proportional to the applied force. Force Sensing Resistors offer many benefits for HMI ( Human Machine Interface) sensing in a wide range of markets and applications versus mechanical switching or capacitive sensing. These include but are not limited to:
• Small, thin and light
• Largely immune to EMI and water events
• Low power
• False touch rejection
• Cost effective
• Highly Durable (>10M activations typical)
The FST series Resistance Temperature Detector (RTD) from Ohmite provides predictable resistance change based on temperature. The SMD chip based design is offered in the popular 0805 size. The FST series is manufactured using a thin film process and contains Palladium (Pd) in the terminations. The Pd is known for its stability and allows a clean connection, helping to eliminate any thermal drift at the connection points. The FST series is produced to the DIN 60751 standard and is available in both the B and 2B tolerances classes.
The FC4T series from Ohmite provides a great TCR rating and low values. The 4 terminal construction is suited for current sense applications and helps deliver an accurate reading to the sensing circuit. The FC4T series is produced in a flip chip design providing outstanding specifications at a lower cost. The FC4T series carries a range of resistance from 0.005-0.100 ohms and a TCR down to 50ppm. Another great specification is the 0.5% tolerance in all values. Combining tolerance, values, and stability in a cost conscience package draws attention from a multitude of engineers.
Ohmite's TAP650 delivers 650 watts of reliable power to a variety of power conditioning, power transmission, and power control applications. These resistors can be designed for liquid or air cooled heat sink systems. Applications include variable speed drives, power supplies, robotics, motor control, and other control devices. Resistive element of the TAP650 is specially designed for low inductance and capacitance providing stable performance in addition to high wattage and pulse loading capability. The design of the TAP650 is catered to applications that require low profile mounting. Applications include variable speed drives, power supplies, robotics, motor control, control devices, and other power designs.
The Ohmite TGH600 series uses new materials and technology to achieve high levels of wattage in a small SOT-227 package. Changes in the thick film process allow new materials to be used to create an extremely effecient product. Proper liquid cooling is required to obtain the full wattage rating of this great resistor series.The TGH600 is sure to find it's way in many applications with its high wattage capability and industry standard SOT-227 package size.
The Ohmite AMC series of thick film chips are compliant with AEC-Q200 specifications. This qualification makes the AMC series ideal for automotive applications. The AMC series resistors are available is sizes from 0201 to 2512. If you are in need of surfacemount AEC-Q200 resistor that is available in multiple sizes and tolernaces down to 0.5%, look no further than the AMC series from Ohmite.
Using specialized material compositions, the LVR Series current sense chips achieve great stability that exceeds the competition. This advantage is produced in industry standard 0201 and 0402 chip sizes.The LVR series is 0201 and 0402 chip sizes are amongst the smallest current sense chips on the market. The LVR series great stability translates to TCR values down to 150ppm. With values down to 2.5m ohms, the LVR series stands as an amazing current sense resistor.
ARF Low Profile Wirewound Metal Clad Resistors
Flexible design with high pulse capability, ideally suited to braking and inverter / converter applications. Enhanced power levels can be achieved when heatsink mounted.
- High power density
- Low profile
- 600V cables as standard
- Heatsink mount for increased power dissipation
- RoHS Compliant
Our Aluminum housed brake resistors are designed for high power and provide great stability. These resistors are constructed using wirewound on ceramic cores and isolated using a mica sheet for high dielectric properties. The aluminum house is filled with a high thermal conductivity material to ensure quick heat dissipation during continues applications. With the ability to have a thermal cut off switch embedded inside the aluminum housing, makes the BA series ideal for any safety application.
If you are using popular aluminum housed resistors, look no further than the HS series extruded heatsinks to complete your design. Each heatsink is drilled and tapped to the standard pattern for these popular resistor types. Each HS series heatsink is specifically characterized for each resistor size, so no guesswork is required.
The WC series is produced using high purity ceramic. The WC is non-conductive producing electrical isolation for high voltage devices. Aluminum heatsinks require isolating materials to achieve the same result as the WC series. The WC series ceramic heatsink is ideal for applications using high voltage TO packaged devices.