For five decades OhmegaPly® has been used in a variety of electronic devices, spanning a broad spectrum of the Electronics Industry.  Applications range from consumer electronics (smart phone MEMS microphones) to aerospace and defense electronics (satellites, space probes, missiles and fighter aircraft).

OhmegaPly’s strength has been its ability to be used in a variety of new ways in new applications.  OhmegaPly acts like a resistive “blank slate” – providing the PCB designer with a key tool for addressing contemporary electronic issues requiring passive resistors or resistive films.

We know that demanding applications require the most consistent and highest quality product possible.  Quality and technical oversight in the production of OhmegaPly, onsite at Ohmega Technologies, assures the lot to lot consistency and 100% traceability of all OhmegaPly products.

OhmegaPly–five decades of consistent reliability and dependability, five decades of constant product improvements, new product introductions and ongoing product enhancements.

Ohmega News

When you work with the world’s most dynamic technology companies, there’s always something newsworthy.

Ohmega Technologies Inc. manufacturer of OhmegaPly printed circuit board embedded resistor material will be exhibiting at the IPC APEX EXPO 2020. The event is taking place at the San Diego Convention Center in San Diego, California from February 4th to the 6th. Stop by booth 4202 to learn if an Ohmega solution is right for you.

Happy New Year! Ohmega will be exhibiting at DesignCon 2020 hosted at the Santa Clara Convention Center in Santa Clara, California January 29th and 30th. Please stop by booth 1244 and say hi. We look forward to hearing about what’s new for 2020.

Attached find the presentation given at PCB Carolina 2019 by Bruce Mahler. The presentation highlights the use of OhmegaPly RCM® in heater applications. Enjoy.

PCB Carolina 2019

OhmegaPly® Embedded Resistor Technology


The demand for high speed/high density printed circuit board (PCB) packaging compels the use of advanced packaging technologies, including embedded passives, in new circuit designs. OhmegaPly® has become the technology of choice in many critical circuit applications. It is used globally as a high volume, cost effective alternative to discrete SMT resistors.

There are numerous benefits in using OhmegaPly® including reduced surface EMI (Electrical Magnetic Interference), reduced inductive reactance, improved signal integrity of high speed, high frequency circuits and greater reliability resulting from the elimination of solder joints required for surface mounted resistors. More routing area is made available with elimination of the discrete SMT resistors and their interconnecting traces and vias.


OhmegaPly resistors are thin film planar resistive elements that are part of the printed and etched circuitry on a standard PCB layer. OhmegaPly RCM® (Resistive Conductive Material) is comprised of a copper-conducting layer (copper foil) and a thin-film resistive alloy layer that has been deposited onto the “tooth” or matte side of the copper foil. The copper foils are single and double treat copper and are available in 1/2 oz (17 micron) and 1 oz (35 micron) weights.

The  OhmegaPly RCM® is available in a number of standard sheet resistivities expressed in ohms per square: 10 ohms/Sq, 25 ohms/Sq, 50 ohms/Sq, 100 ohms/Sq and 250 ohms/Sq. 

Based on original equipment manufacturers (OEM) and PCB requirements, the OhmegaPly RCM® is laminated by independent laminators or PCB manufacturers to specific dielectric materials. It can be bonded to virtually any dielectric material and thickness currently being used by the Industry.


Design of a specific resistor value follows thin film resistor design criteria – see the Ohmega Toolbox for more information.  Sheet resistivity is the resistance in ohms per square and is a dimensionless number. The value of any specific resistor is determined by the ratio of the length of the resistor to its width multiplied by the sheet resistivity used.   A simple example would be a 68 ohm value resistor that uses 25 ohm per square OhmegaPly. The total number of squares required would be 68 ohms divided by 25 ohms per square, or 2.72 squares. If the resistor width is designed to be 10 mils (0.010″) then the length of the resistor must be 10 mils x 2.72 squares or 27.2 mils (0.027″).

The OhmegaPly® laminate is processed by the PCB manufacturers the same way as other PCB laminates by a subtractive print and etch process.   As with normal processing procedures, the board shop uses artwork or laser direct imaging to define geometric patterns that are imaged and etched to create individual resistors on either existing inner layers of a multilayer board or on the surface of a printed circuit board.


OhmegaPly® embedded resistor technology has been used in numerous applications since the early 1970′s. Over the decades it has exhibited excellent long-term stability and reliability and has become the technology of choice in many critical circuit applications. In the millions of printed circuit boards, and trillions of component hours of use, OhmegaPly® has demonstrated absolute reliability. OhmegaPly® resistors in new designs are an application of a mature, well proven, technology.


Any PCB shop can process OhmegaPly®.  No license or other fee is required.  Since standard equipment, chemistries and process consumables are used there is minimal capital investment required by the board shop to process OhmegaPly®. Most electrical test equipment can be used with a software upgrade to enable resistor testing – see the Ohmega Toolbox for more information.

Cost/Benefit Analysis

The cost of using OhmegaPly® is dependent on the material price as supplied by Ohmega Technologies, Inc., the conversion cost that is applied to a printed circuit board by the board shop and any reduction in the overall board cost due to design enhancements. In addition to eliminating discrete surface mount resistors (SMT) and their assembly costs, PCB cost reduction is achieved by smaller board form factors, reduced layer counts, and the use of conventional PCB technologies rather than more expensive build-up and/or high density interconnect (HDI) technologies. In general, OhmegaPly® becomes economical to use – as a replacement for chip resistors – when the resistor density is approximately 5 to 6 resistors per square inch of board area.


OhmegaPly® is used in all areas of the electronics industry: military/aerospace, computer,   telecommunications, consumer and medical electronics.   Some of the applications include supercomputers, servers, graphic enhancement cards, workstations, application specific integrated circuit simulators (ASIC), automated test rquipment (ATE), active electronically scanned array radar systems (AESA), resistive cards (r-cards), probe cards, telecommunications switching cards, burn-in boards, heater elements, antennas, base stations, and cellular telephone modules.  OhmegaPly® resistors are used as a direct replacement for discrete resistors. Some examples are as potentiometers, line terminators, pull-up/pull-down resistors, series and parallel terminating resistors, isolation resistors and as heater elements.

Please contact us with any questions you may have and we’ll be delighted to assist you.