TAK Technology
V4F1
HIGH FREQUENCY STABLE MATERIALS
V4F1 is a NiZn ferrite with an initial permeability (μi) of approx. 10, a saturation flux density (Bs) of approx. 150 mT at 25 °C (140 mT at 100 °C) and a Curie temperature above 320 °C. It trades an extremely low permeability for an extremely high frequency ceiling — by Snoek's law, the lower the μi the higher the resonance frequency — so V4F1 keeps inductive behaviour and low insertion loss into the VHF/UHF range, the frequency end-point of this volume's high-frequency family; with Tc above 320 °C and Bs almost unchanged with temperature, its characteristics are highly temperature-insensitive. Typical uses are suppression beads above the UHF band, ultra-high-frequency RF filters and common-mode noise suppression on high-speed lines, plus HF circuits in wireless charging and medical electronics. Despite the similar name, V2F1 (μi approx. 30) is positioned differently — V4F1's μi is in fact lower and its frequency ceiling higher; for filtering and resonance below the 100 MHz class choose V2F1 or M5E1, reserving V4F1 for the topmost band.
Magnetic Characteristics
| Characteristic | Condition | Value | Unit |
|---|---|---|---|
| μiInitial Permeability | 100 kHz & <0.2 mT | 10±25% | — |
| BsSaturation Flux Density | 3000 A/m · 25 ℃100 Hz | 150 | mT |
| BsSaturation Flux Density | 3000 A/m · 100 ℃100 Hz | 140 | mT |
| BrRemanence | 3000 A/m · 25 ℃100 Hz | 95 | mT |
| BrRemanence | 3000 A/m · 100 ℃100 Hz | 90 | mT |
| HcCoercivity | 3000 A/m · 25 ℃100 Hz | 1450 | A/m |
| HcCoercivity | 3000 A/m · 100 ℃100 Hz | 1400 | A/m |
| αμrTemperature coefficient of permeability | 20～60 ℃ | 40 | ×10⁻⁶/K |
| tanδ/μiRelative Loss Factor | 25 MHz & <0.2 mT | 600 | ×10⁻⁶ |
| tanδ/μiRelative Loss Factor | 100 MHz & <0.2 mT | 700 | ×10⁻⁶ |
| TcCurie Temp. | 100 kHz & <0.2 mT | >320 | ℃ |
| DDensity | Archimedes method | 4.9 | g/cm³ |
| ρVolume Resistivity | DC Current | 10⁷ | Ω·m |
Characteristic curves
Applications
| Application | Role | Band | Temperature |
|---|---|---|---|
| Wideband signal transformer / balun | Alternative | ≤55 MHz | — |
| Antenna rod / RFID / high-Q inductor | Alternative | 3–55 MHz | — |
| Low-μ tuning / HF resonance | Alternative | 3–55 MHz | — |