What RO4003C’s 3.38 Dk, copper-matched CTE and FR-4-style processability mean in practice, and where the laminate wins across telecom, automotive radar, aerospace, medical and IoT designs.
Few laminates have achieved the working-middleware status of Rogers RO4003C. It sits in the sweet spot between cost-effective FR-4 and exotic pure-PTFE materials, which is why it anchors so many designs in the broader high-frequency, microwave and RF circuit board material lineup. This analysis walks through the properties that matter in production and the applications where 4003C earns its keep.
Four characteristics define the material in real designs:
| Property | Typical Value | Design Impact |
|---|---|---|
| Dielectric constant (Dk) | 3.38 ±0.05 @ 10 GHz | Tight tolerance keeps impedance within spec |
| Dissipation factor (Df) | 0.0027 @ 10 GHz | Low insertion loss in RF front ends |
| Glass transition (Tg) | >280°C | Survives lead-free reflow without degradation |
| Moisture absorption | ~0.06% | Stable Dk in humid environments |
| Flammability | UL 94 V-0 | Meets telecom and automotive qualification |
The material’s balance of loss, stability and processability opens it across five sectors:
RO4003C remains a preferred laminate for high-frequency circuit design because it delivers a rare balance: PTFE-class electrical performance with FR-4-class processability. It is one entry in the wider Rogers RO4000 series portfolio, and as 5G-Advanced, autonomous driving and IoT deployments scale, its application footprint is set to widen further. For programs needing even lower loss at millimeter-wave bands, comparing it against the RT/duroid 5880 parameter set is a worthwhile exercise before freezing the stack-up.
Frequently Asked Questions
3.38 with a tolerance of ±0.05, and a dissipation factor of 0.0027. The tight Dk window is what keeps controlled-impedance lines predictable from batch to batch.
Yes. It is a woven-glass reinforced hydrocarbon laminate that drills, etches and laminates on conventional FR-4 lines — no plasma desmear or sodium naphthalene treatment of the kind pure PTFE materials demand.
5G base station power and antenna stages, 77 GHz automotive radar and satellite communication boards — designs that need low loss and thermal reliability but also want volume production economics.
Moisture absorption is around 0.06% and the laminate carries a UL 94 V-0 rating, so electrical properties stay stable through humidity exposure and the material meets telecom and automotive flammability requirements.
Send your stack-up, layer count and target frequency band and we will confirm material availability, process capability and lead times.
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