Why Embedded Resistors Matter for Chip Packaging
The demand for high-speed, high-density electronic devices has compelled chip packaging designers to adopt advanced techniques including embedded passives. The challenge is straightforward: discrete surface-mount resistors consume valuable surface area on the package substrate, drive up layer count to accommodate routing, and introduce parasitics that degrade signal integrity at the data rates modern ICs operate at.
Embedded resistor technology resolves this by:
- Eliminating surface-area consumption. Resistors live inside the substrate stackup rather than on top of it, freeing real estate for active components and improving I/O density.
- Reducing form factor. Documented PCB area reduction of up to 40% in high-density designs, with corresponding improvements in package thickness, weight, and bill of materials.
- Improving signal integrity. Parasitic inductance drops from 0.5–1.0 nH (typical SMD) to less than 0.1 nH; capacitance and insertion loss drop in parallel. The result is cleaner termination, better impedance matching, and reduced EMI/crosstalk in high-speed digital and mixed-signal designs.
- Eliminating solder joint failure modes. No solder joint means no solder fatigue, a known failure mode in package-level reliability testing.
- Simplifying assembly. Embedded resistors require no pick-and-place, no solder paste, and no reflow pass for those resistor functions, reducing assembly steps and improving first-pass yield.
Integration with Standard PCB Fabrication
A core advantage of Ohmega Ticer materials for chip packaging is process compatibility.
Standard print and etch
OhmegaPly® and TCR® RCM materials are laminated to dielectric the same way as any other copper foil and processed by PCB fabricators through standard subtractive print and etch processes. No specialized fabrication equipment is required.
A qualified supply base
Over 70 PCB fabricators worldwide offer reliable mass production of embedded resistors using Ohmega Ticer materials.
CAD and simulation support
Ohmega Ticer publishes design guidance for both Altium Designer and Cadence OrCAD X / Allegro PCB Editor environments, including footprint creation, layer stack setup, Gerber output, and design rule check (DRC) configuration. Because embedded resistors are inherently planar, they are accurately modeled in existing PCB electromagnetic and circuit simulators, eliminating the abstract electrical models often required for discrete SMDs.
Applications in Chip Packaging and Advanced Substrates
Embedded resistor materials support a range of chip packaging and HDI substrate applications:
Termination resistors
In high-speed digital interfaces including DDR, SerDes, and PCIe
Pull-up and pull-down resistors
Integrated directly on voltage planes
Impedance matching networks
For analog and mixed-signal circuits
Voltage dividers and bias networks
Within package substrates
OhmegaPly® MTR®
Resistors built within printed circuit traces less than 100 microns wide, for HDI designs where discrete component placement is difficult or impossible
OhmegaPly® ORBIT
Low-value termination applications in high-density designs requiring tight 3% material tolerance
Which Ohmega Ticer Products Fit Chip Packaging Applications
OhmegaPly® (NiP)
The flagship embedded resistor material. Sheet resistivities from 10 to 377 Ω/□, with sub-micron resistive layer thickness (≤1 µm) that does not meaningfully add to overall PCB or package thickness.
OhmegaPly® MTR®
For miniature resistors built within copper traces less than 100 microns wide. Ideal for HDI packaging where conventional resistor placement is not viable.
OhmegaPly® ORBIT
A 10 Ω/□ sheet resistivity product designed for low-value terminations in space-constrained designs, with 3% material tolerance for very small resistor footprints.
TCR® (NiCr / NCAS / CrSiO)
Vacuum-deposited thin film with tight tolerances and resistor values from 10 ohms to 100k ohms. Engineered for high-speed, high-density electronic packaging requiring exact resistance values and thermal stability.
TCR-EHF®
For mmWave and high-speed digital chip packaging applications where insertion loss must be minimized at the highest frequencies.
Design Considerations for Chip Packaging
Designing with embedded resistors in package substrates requires coordination on resistor geometry (the L/W ratio multiplied by sheet resistivity determines the final value), tolerance budgeting (final tolerance is a combination of material tolerance, lamination effects, and PCB etching precision), and Gerber documentation (a separate file is required for the resistor layer).
The Ohmega Ticer Design Guide and resistor calculator support this work, and our engineering team provides design consultation and simulation support for package-level applications.
For material selection, fabricator coordination, and design support for your chip packaging program, contact our engineering team.