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Ohmite Manufacturing Company has been the leading provider of resistive products for high current, high voltage, and high energy applications for over 80 years. The company's full complement of resistor construction includes wirewound, wire element, thick film, and ceramic composition.

Ohmite offers a broad selection of power resistors to worldwide customers in the industrial, medical, military, and aerospace industries. Through ongoing product development, Ohmite continues to provide the latest in resistor technology required by today's sophisticated high voltage, high current, and high energy circuit designs.

Availability of Inventory

Ohmite Waldom Electronics stocks and provides immediate shipment on over 6,500 Ohmite part numbers. Waldom offers broken-pack quantities on the vast majority of Ohmite part numbers at a small mark-up over distributor cost through our Vanishing MOQs program. Waldom offers differentiated pricing between Ohmite authorized and non-authorized distributors.

D Series Heatsink

Heatsink For TO-268, TO-263, TO-252 Devices

Extruded heat sink body
Compatible with TO-252, TO-263 and TO-268 SMD devices
Increased surface area over standard stamped heatsinks
For use with Ohmite TDH35 series

C-60/B-60 Series Heatsinks

Clip and Screw Mount Heatsink

Modular system including up to 2 extrusions and 60mm fan.
Multiple devices on single extrusion.
Modular systems can be built to customer specifications.
Designed for 60X60 fan for forced convection.

CP4 Series Chillplate

4 Pass Watercooled Heatsink

Copper tubing with aluminum base
Designed for popular Ohmite series
TAP600,TAP800,andTAP1K0/2K0
Design flexability; custom lengths and mounting patterns can be specified.

F and R Series Heatsink

Heatsinks for TO-220 and TO-247 Devices

For vertical mounting with solderable pins
Compatible with TO-220, TO-218, TO-247 devices
Black anodized
Thermal resistance as low as 3°C/W
For TBH, TCH, and TEH series

M Series Heatsink

TO-220, TO-247 Multiple Device Heatsink

Matrix clip system for TO-247 and TO-264 packages
Maximum Repeatability; Constant spring force over repeated assembly/disassembly
Mount up to 4 devices per heatsink
Black anodized or degreased finish
For TBH, TCH, and TEH series

Euro-Power Wirewound

European Sized High Power

Special European Core Dimensions
High Wattage
All Welded Construction
"Live" Mounting Options
Round Wire and Ribbon Wire

MC4 Series

4-up DIP Resistor Package

Up to 10KV voltage handling.
S-bend terminations mounting integrity and airflow consideration.
4 resistors per chip on 7575 package.
Multiple possible configurations

W Series Heatsink

W Series Heatsinks for TO-220 and TO-247 devices

No screw, clip system
Compatible with TO-247 and TO-220 devices
Spring Clip delivers constant repeatable pressure
For TBH, TCH, and TEH series
Performance data

BA Series

High Power Aluminum Cased Wirewound

Multiple Wattages up to 1KW
Scalable, Custom Lengths Available
Custom Terminations
Thermal Cutoff Available
Heatsinkable Chassis Mountable

C-40 Series Heatsink

Clip Mounting For TO-247,TO-264 and TO-227 Devices

Modular System with choice of clips
Multiple devices on a single extrusion
Alternate extrusion lengths available
Designed to mount 40X40 fan to provide forced convection.
Complete system can be built to customer specifications.

R2 Series Heatsink

Cam Lock Heatsink for TO Devices

No tool, camming clip
Increased surface area
For TBH, TCH, TEH and TFH series
Constant clip pressure
Available in black anodized or decreased finish

EY Series

Ceramic Composition Energy

Designed for high energy applications Up to 400 joules of energy handling
Maximum impulse values of 25KV
Standard values up to 100K ohms
Robust design with epoxy coating

VM Series Heatsink

Vertical/Horizontal Mount Heatsink

Wide mounting channel for larger devices and popular TO-220, TO-247, and TO-264 packages
Horizontal, Vertical and Universal mounting
Black anodized for maximum thermal performance
For TBH, TCH, TEH and TFH series

TP Series High Energy

Thick Film Surge

Surge Capable to 100 Joules
Wide Resistance Range
High Power Density
Low Inductance
Great Stability and Tolerance

C Series Heatsink

C Series For TO Package Heatsinks

No tool, camming clip system
Compatible with TO-264, TO-247,TO-220 and TO-126 Devices.
Mount up to 3 devices per heatsink
Spring Clip delivers constant repeatable pressure
For TBH, TCH, TEH, and TFH series

E Series Heatsink

Heatsink for TO-220 Devices

Compatible with TO-220 devices
Thermal resistance as low as 7.4°C/W
Available in multiple heights
Black Anodized and degreased versions
For TBH, and TCH series

SV Series Heatsink

LED Module Heatsink

Configurable and scalable to application needs.
Specifications can include: length,surface finish, mounting holes, etc.

AH Series Extrusions

Custom Extrusion Heatsinks

Multiple surface finishes available
Modifications available: screw holes, bolt patterns and milling per customer specifications

EBW Series

Manganin/ NiCr Element Resistor

Resistance values as low as 0.2m ohms.
High current handling- up to 180 amps.
Extreme stability down to 60ppm.
Inductance values of less than 3nH.

IS Series Resistor

Thick Film Heatsinkable

Low profile
Multiple termination options
Single mounting hole
Low inductance
Up to 270 watts, when properly heatsinked

S Series Heatsink

LED Star Package Heatsinks

Designed for LED modules in a "Star" package
Multiple extrusion lengths
Black Anodized and Degreased finishes available

RW5 and RW7 Series

High Power SMD Wirewound

5 and 7 watts of Power
Unique Finned Design
Wirewound Performace
Tight Tolerance
Great Stability, Low TCR Values

Metalohm Series

Wirewound Heatsinksble Radial Terminal

Power rating 20-150 watts properly heatsinked
Resistance range 0.5-50K ohms
5% Tolerance
Multiple terminal choices
Terminal sleeves to increase dielectric

WFH Series

Wirewound Heat Sinkable Power Resistor

Power rating 330 watts with proper heatsink
Resistance range 0.22-39K ohms
5% and 10% Tolerance
TCR as low as 50ppm
Amp terminals or Wire lead terminations

Z Series Choke

R. F. plate chokes

Inductance 84µH-0.2µH
Current rating up to 4 amps
Frequency range 3 MHz-520 MHz

Little Rebel^® Series

Carbon film

Only available through select distributors
Power rating up to 2 watts
24 values per decade
Key to five-band code

PC-58 Series

PCB Mount Tubular Wirewound

Power rating 3 and 5.25 watts
Resistance range 1-20K ohms
5% Tolerance standard
Radial Construction for direct insertion into circuit boards

30 Series

High Energy Wirewound, Various Constructions

Special winding techniques to maximize the effective joule rating of each resistor
RoHS Compliant

OD/OF/OA series

Carbon Composition Molded

Power rating 0.25-1 watt
Resistance range up to 20 meg ohms
Molded insulation
Comparable to MIL RC07, RC20 and RC32
Key to five-band code
RoHS Compliant

10 Series

Kelvin & Axial Wire Element Current Sense

Power rating 2-5 watts
Resistance as low as 0.005 ohms
1% Tol. std., others on request
Fixed measuring point
Ideal for current sense applications
Low inductance (non inductive below 0.25 ohms)
RoHS Compliant

14A Series

Alumina Body Current Sense

Power rating of 4 watts
Resistance as low as 0.004 ohms
1% Tolerance standard
Fixed measuring point
Ideal for current sense applications
Low inductance

60 Series

Metal Element Current Sense

Power rating 0.1-3 watts
Resistance range 0.005-0.05 ohms
Tolerance 3%
TCR as low as 90ppm
non inductive
flameproof
RoHS Compliant

Audio Gold Resistors

Silicone Non-Magnetic Axial & Tubular

Power rating 3-50 watts
Resistance range 0.1-22K ohms
5% Tolerance standard
Non magnetic materials
Flame proof coating
All welded rugged construction

20 Series

Vitreous Enamel Conformal Axial

Power rating 1-10 watts
Resistance range 0.1-100K ohms
Tolerance 5%
TCR values down to 30ppm
Flame resistant Vitreous coating
All welded rugged construction
RoHS Compliant

40 Series

Silicone-Ceramic Conformal Axial

Power rating 1-10 watts
Resistance range 0.1-150K ohms
Tolerance 1%
TCR values down to 20ppm
Conformal Silicone coating
All welded rugged construction
RoHS Compliant

80 Series RW Series

Silicone-Ceramic Conformal Axial/ Mil-R-26 Qual

Power rating 1-10 watts
Resistance range 0.1-150K ohms
Tolerance 1-5%
TCR values down to 20ppm
Conformal Silicone coating
Available in MIL-R-26 specifications

90 Series

Molded Vitreous Enamel Axial

Power rating 1.5-11 watts
Resistance range 0.1-91K ohms
5% Tolerance standard
TCR values down to 30ppm
Molded Vitreous
Heat Sinkable mounting clips available
RoHS Compliant

Axiohm^® Series

Centohm Coated Wirewound Axial

Power rating 1-10 watts
Resistance range 0.1-150K ohms
Tolerance 1%
TCR values down to 20ppm
Conformal Silicone coating
All welded rugged construction

HSP Series

Hermetically Sealed Precision

TCR Accuracy to ±0.001% absolute
Temperature coefficient to ±3 ppm/°C, -10°C to +80°C
Shelf life to 10ppm per year
Oil filled version available

WH/WN Series

Miniature Molded Wirewound

NEW 3-5 watt Offering
Power rating 0.5-2 watts
Resistance range 0.1-8K ohms
1% and 5% standard Tolerance
TCR as low as 20ppm
Non inductive versions

WL Series

Miniature Wirewound Current Sense

Power rating 0.5-2 watts
Resistance range 0.005-0.1 ohms
1% Tolerance standard
TCR as low as 100ppm
Miniature size

60 Series

Four Terminal Bare Element

Power rating up to 5 watts
Resistance as low as 0.002 ohms
Tolerance 1% standard
TCR as low as 50ppm
Ideal for current sense applications

CS3 Series

Kelvin Connect Precision Current Sense

Power rating 3 watts
Resistance range 0.001-0.050 ohms
Tolerances of 1%, 2% and 5%
TCR of 60ppm
Kelvin configuration
Non Inductive design
RoHS Compliant

SH Series Shunt

Precision Metal-Clad Closed Element Shunts

Up to 300 amps current handling
Kelvin configuration
0.5% Tolerance available
TCR 30ppm max
Bus bar mounting

60S Series

Metal Plate Current Sense SMD

Power rating 0.25-1 watt
Resistance values as low as 0.002 ohms
Tolerance 5%
TCR as low as 100ppm
low inductance
Current sensing
RoHS Compliant

FC4L Series

Kelvin Connect Current Sense Chip

Power rating 0.25-5 watts
Resistance range 0.001-0.500 ohms
Tolerance as low as 1%
TCR as low as 50ppm
Standard Sizes: 0603,1206, and 2512
For current sense applications utilizing a Kelvin configuration

FCSL Series

Metal Foil Current Sense Chip

Power rating 0.2-10 watts
Resistance range 0.001-0.100 ohms
Tolerance as low as 1%
TCR as low as 50ppm
For current sense applications

LVC Series

Low Value Thick Film Chip

Power rating 0.25-1 watt
Resistance range 0.01-0.976 ohms
1% Tolerance std
TCR as low as 100ppm
Available in 0603, 2010, and 2512 sizes
RoHS Compliant

LVK Series

Four Terminal High Precision Current Sense

Power rating 0.5-2 watts
Resistance values as low as 0.001 ohms
Tolerance 0.5 and 1% standard
TCR as low as 50ppm
High-precision Kelvin connect capability in a small package

MCS Series

Metal Element Current Sense

Power rating 1-2 watts
Resistance range 0.005-0.5 ohms
1%,3% and 5% Tolerance
TCR as low as 40ppm
Low inductance and Thermo EMF
Standard 1206 and 2512 sizes

RW1/RW2 Series

Kelvin Connect Current Sense SMD

Power rating 1 and 2 watts
Resistance range 0.005-0.05 ohms
1% Tolerance standard
Great TCR of 50ppm
Designed in a Kelvin configuration
RoHS Compliant

Cabinet Product Assortment

Popular Power Resistor Series & Heatsinks

For prototype and lab design
Contains most popular resistor and heatsink series
7 different cabinets assortments
20 drawers and 40 compartments
Product Key with every cabinet
More info

TGHG Series

100 watt SOT-227 Kelvin Connect Current Sense

Power rating 100 watts with proper heatsink
Resistance range 0.0005-1 ohm
1% Tolerance
TCR as low as 60ppm
Kelvin configuration
Thermal resistance 0.56°C/W

TDH35 Series

35 Watt TO-263 Surface Mount Thick Film

Power rating 35 watts with proper heatsink
resistance range 0.05-10K ohms
5% Tolerance standard 1% on request
TCR as low as 50ppm
Thermal resistance of 4.28°C/W to heatsink
Low inductance design
RoHS Compliant

TAH20 Series

20 Watt TO-220 Thick Film

Power rating 20 watts with proper heatsink
resistance range 0.05-10K ohms
5% Tolerance standard 1% available
TCR as low as 50ppm
Thermal resistance of 6.25°C/W to heatsink
Low inductance design
RoHS Compliant

TBH25 Series

25 Watt TO-220 Thick Film

Power rating 25 watts with proper heatsink
resistance range 0.03-10K ohms
5% Tolerance standard
TCR as low as 50ppm
Thermal resistance of 5°C/W to heatsink
Low inductance design
RoHS Compliant

TCH35 Series

35 Watt TO-220 Thick Film

Power rating 35 watts with proper heatsink
resistance range 1-10K ohms
5% Tolerance standard 1% on request
TCR as low as 50ppm
Thermal resistance of 4.28°C/W to heatsink
Low inductance design
RoHS Compliant

TEH100 100 Watt

100 Watt TO-247 Thick Film

Power rating 100 watts with proper heatsink
resistance range 0.05-1 meg ohm
5% and 1% Tolerance standard
TCR as low as 50ppm
Thermal resistance of 1.5°C/W to heatsink
Low inductance design

TEH70 Series

70 Watt TO-247 Thick Film

Power rating 70 watts with proper heatsink
resistance range 2-10K ohms
5% Tolerance standard
TCR as low as 50ppm
Thermal resistance of 1.79°C/W to heatsink
Low inductance design
RoHS Compliant

TFH85 Series

85 Watt TO-264 Thick Film

Discontinued July 2013
Power rating 85 watts with proper heatsink
resistance range 2-10K ohms
5% Tolerance standard
TCR as low as 50ppm
Thermal resistance of 1.47°C/W to heatsink.

TAP1000 and 2000 Series

1000 and 2000 Watt Heat Sinkable Planar Thick Film

Power rating 1000-2000 watts with proper heatsink
resistance range 0.5-1K ohms
10% Tolerance standard
TCR 250ppm
2000 DC max operating voltage
Low inductance design

TAP600 Series

600 Watt Heat Sinkable Planar Thick Film

Power rating 600 watts with proper heatsink
resistance range 0.25-100K ohms
10% Tolerance std.; 5% available
TCR 150ppm
Thermal resistance of 0.115°C/W to heatsink
Low inductance design
RoHS Compliant

TAP800 Series

800 Watt Heat Sinkable Planar Thick Film

Power rating 800 watts with proper heatsink
resistance range 0.25-10K ohms
10% Tolerance standard 5% available
TCR 150ppm
Thermal resistance of 0.115°C/W to heatsink
Low inductance design

TGH Series

120 and 200 Watt SOT227

Power rating up to 200 watts with proper heatsink
Resistance range 0.1-1 meg
5% Tolerance
TCR 250ppm
Thermal resistance of 0.35°C/W
Multiple configurations
RoHS Compliant

TL Series

Modular Thick Film Heat Sinkable

Power rating 275 watts with proper heatsink
Resistance range 0.3-4 meg ohms
10 % Tolerance standard, others available
TCR 250ppm
0.25 inch quick connect terminations

89 Series

Axial Terminal Wirewound Aluminum Housed

Power rating 5-50 watts with proper heatsink
Resistance range 0.005-100K ohms
Tolerance of 1% and 5% standard
TCR as low as 20ppm
Aluminum housing provides heatsink capabilities
RoHS Compliant

HS/HSN Series

Aluminum Housed Axial Wirewound Heat Sinkable

Power rating 100 and 250 watts with proper heatsink
Resistance range 0.05-35.7K ohms
Tolerance of 1% and 5% standard
TCR as low as 30ppm
Aluminum housing provides heatsink capabilities

14984 Series

High Current Round Edgewound

Up to 160 Amps of Continuous Current
10% tolerance standard
Crosses to popular Ward Leonard and Westinghouse styles

WLRD6G Series

High current oval edgewound resistors

Current rating up to 146 amps
Resistance range 0.082-6.13 ohms
10% Tolerance
Replaces GE style resistors 42D6G1 and 42D6G2

WLRH Series

Heliohm Wirewound

Consult factory on all inquires.

PFE and PFR Series

Powr-Rib^® Edgewound and Round Wire

Current ratings up to 100 amps
Resistance range 0.33 to 42 ohms
10% Tolerance standard
Short time overload of 10 times wattage for 5 seconds

280 Series

Corrib^® Hi-Current, Fixed and Adjustable

Custom Terminal available
Mounting hardware available
Power rating 35-2000 watts
Resistance range 0.02-358 ohms
10% Tolerance std.; TCR 400ppm
Rugged and flame resistant Vitreous coating
Low ohm / High current
RoHS Compliant

210 Series

Vitreous Enamel Adjustable Power

Power rating 12-1000 watts
Resistance range 1-100K ohms
10% Tolerance std.; TCR 260ppm
Adjustable lug supplied
Overload of 10X wattage for 5 sec.
Custom Core & Terminal available
Mounting hardware available
RoHS Compliant

250 Series

Oval Core Fixed Wirewound

Power rating 10-55 watts
Resistance range 1-60K ohms
Tolerance 5%
TCR as low as 260ppm
Stackable design
Available in adjustable version
Custom Terminal available

270 Series

Tubular Fixed Wirewound

Power rating 12-1000 watts
Resistance range 0.10-392K ohms
5% Tol. standard, 10% under 1 ohm
TCR down to 260ppm
Rugged, flame resist. vitreous coating
Overload of 10X wattage for 5 sec.
Custom Core & Terminal available
Mounting hardware available
RoHS Compliant

HVC Series

Precision High-Value High-voltage Wraparound Chip

Power rating 0.050-1.5 watt
Resistance range up to 1 Tera ohm
5% Tolerance standard, others available
TCR as low as 25ppm
Voltage handling up to 6000 volts
Industry standard sizes 0402, 0603, 0805, 1206, 2512, 4020

HVF Series

High Voltage Film Flip Chip

Power rating up to 1 watt
Resistance up to 100 Gig
1% Tolerance standard
High Voltage handling up to 3000 volts
industry standard sizes 1206 and 2512
RoHS Compliant

Slim-Mox Series

Precision Thick Film Resistors and Dividers

Power rating 0.25-9 watts
Resistance range 100-5 gig ohms
Tolerance 0.5%-20%
TCR as low as 25ppm
Voltage handling up to 25KV
Divider Specifier
RoHS Compliant

Maxi-Mox Series

Precision Thick Film Axial

Power rating 2-12.5 watts
Resistance range 250-1 tera ohm
Tolerance as low as 0.5%
TCR as low as 25ppm
Voltage handling up to 50KV
Non inductive versions available
Divider Specifier
RoHS Compliant

RX-1M Hi-Meg

Hermetically Sealed Ultra High Resistance

Power rating 0.5 watts
Resistance range 1M-10T Ω
Tolerance dependent on resistance value
TCR as low as 50ppm
No outgassing
RoHS Compliant

Super Mox Series

High Voltage Non Inductive Axial

Power rating 3.8-20 watts
Resistance range 1K -50 gig; up to 1 Tera ohm available
0.05%-10% Tolerance
TCR values as low as 10ppm
Up 90KV voltage handling
Non-Inductive design

Power-Mox Series

Precision Thick Film Tubulars and Dividers

Power rating 25-75 watts
Resistance range 20K-1T Ω
Tolerance as low as 0.5%
TCR from 25ppm-50ppm
Voltage handling up to 60KV
Multiple Terminations
Divider Specifier
RoHS Compliant

Potentiometers

Panel Mount Molded Composition

Power rating 0.5 watt and 2 watt
Resistance range 50-5meg ohms
10% tolerance
Single rotation
produced in accordance to Military RV4N, RV4L, RV6L, RV6N and 2RV7N types

Solid State Power Controls

Variable Control for AC Inputs/Outputs

Discontinued Mid 2013
Up to 240 volts AC
Up to 8.3 amps AC current handling
Built in ON/OFF switch
Adjustable control range

Cap-Ranger^®

Capacitance Selector

Range: 100 picofarads to 11.111 microfarads in 100 picofarad steps
Rugged Construction
Maximum Voltage 200 volts
Accuracy 2%

Dec-Ranger^TM

Decade Resistance Selector

Range: 1 ohm thru 1, 111, 110 ohms in 1 ohm increments
6 decades
Sturdy metal construction

Ohm-Ranger^®

Resistance Selector

Range: 1 ohm thru 11, 111, 110 ohms in 1 ohm increments
7 decades
Rugged metal construction

Power Tap Switches

Panel Mount High-current, non-shorting

Up to 100 amps current rating
Up to 12 taps per switch
Ceramic and metal construction provides resistance to arcing, burning and charring
UL listed for most models
Selection guide