PC44-TDK
Grade · default condition
Default choice for 100–500 kHz switching transformers and inductors that need stable μi ≈ 2400, Bs ≈ 510 mT and a core-loss minimum at 80–100 °C, supplied as-sintered and ungapped.
Values for the PC44-TDK condition
Other PC44 tempers and conditions
PC44 is listed in 3 conditions; see the grade overview at PC44.
Compare all 3 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
PC44-equivalent Mn-Zn power ferrite | Pick for cost-sensitive volume power cores: performance is close to the reference grade, with somewhat wider lot-to-lot spread in core loss and permeability, to 120 °C. | — | 28 | 0 | 590 HV | 4 W/m·K |
/ PC44-class power ferrite | Use as a second source for imported power ferrite: wide availability and a complete E/EE/PQ core range at the same performance class, with service to 120 °C. | — | 28 | 0 | 590 HV | 4 W/m·K |
PC44-TDKDefaultThis page PC44 | Default choice for 100–500 kHz switching transformers and inductors that need stable μi ≈ 2400, Bs ≈ 510 mT and a core-loss minimum at 80–100 °C, supplied as-sintered and ungapped. | — | 30 | 0 | 600 HV | 4 W/m·K |
What is PC44-TDK?
PC44-TDK is PC44 in the PC44-TDK grade — default choice for 100–500 kHz switching transformers and inductors that need stable μi ≈ 2400, Bs ≈ 510 mT and a core-loss minimum at 80–100 °C, supplied as-sintered and ungapped. PC44-TDK has a tensile strength of 30 MPa (4.35 ksi), weaker than 77% of ceramic grades. Elongation at break is 0% and the elastic modulus is 150 GPa (21.8 Msi). PC44-TDK has a density of 4.8 g/cm³ (0.173 lb/in³), lighter than 52% of ceramic grades.
Advantages
- Low embodied carbon — 3.5 kg CO₂/kg, better than 81% of ceramic grades
Limitations
- Limited service temperature — 120°C (248 °F), worse than 96% of ceramic grades
- Hard to polish — 55/100, worse than 85% of ceramic grades
- Needs corrosion protection — 55/100, worse than 77% of ceramic grades
PC44-TDK properties
Typical room-temperature values for PC44-TDK; 15 are specific to this condition. Other listed values are PC44 reference data and may not represent this condition. Bars are the position among ceramic grades.
Physical2
PC44-TDK has a density of 4.8 g/cm³ (0.173 lb/in³), lighter than 52% of ceramic grades.
Mechanical12
PC44-TDK has a tensile strength of 30 MPa (4.35 ksi), weaker than 77% of ceramic grades. Elongation at break is 0% and the elastic modulus is 150 GPa (21.8 Msi).
Thermal5
PC44-TDK is rated for continuous service to 120°C (248 °F). It conducts heat at 4 W/m·K (2.31 BTU/hr·ft·°F), worse than 68% of ceramic grades. Thermal expansion is 10 µm/m·K (5.56 µin/in·°F).
Electrical2
PC44-TDK has an electrical resistivity of 6.5 Ω·m.
Chemical & Environmental2
Corrosion resistance is good (55/100), worse than 77% of ceramic grades.
Sustainability3
Producing a kilogram of PC44-TDK takes about 45 MJ of energy and emits 3.5 kg of CO₂ — less than 84% of ceramic grades. Typical recycled content is 10%.
Manufacturability3
PC44-TDK's machinability is not recommended (8/100, better than 69% of ceramic grades).
Common Calculations4
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PC44-TDK
Is PC44 easy to machine?
After sintering, only diamond-wheel grinding or lapping of mating faces and air gaps is possible; no turning, milling or drilling. Grind wet and support edges to prevent corner chipping.
Can PC44 be welded?
Not weldable; core halves are fixed with clips, epoxy or banding tape, and adhesive thickness in the joint shifts the A_L value.
Can PC44 be formed, bent or molded?
Spray-granulated calcined powder is dry pressed into E/EE/PQ/ETD and toroid shapes, then sintered at 1280–1380 °C under controlled oxygen partial pressure with about 15–20 % linear shrinkage.
What surface finishes work on PC44?
Mating faces are precision ground or lapped to keep the residual gap low; outer surfaces can be epoxy powder coated or parylene coated for insulation and moisture resistance, and toroids are normally coated to guarantee magnet-wire breakdown voltage.
PC44 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Fe2O3about 53 mol% Fe2O3 | 66 – 71 | 69 |
| MnOabout 36 mol% MnO | 18 – 24 | 21 |
| ZnOabout 11 mol% ZnO | 7 – 12 | 9.5 |
| CaOhigh-resistivity grain-boundary additive | 0.02 – 0.15 | 0.06 |
| SiO2high-resistivity grain-boundary additive | 0.01 – 0.05 | 0.02 |
| Co/Nb/Ta/Ti oxidestrace dopants to adjust loss and temperature characteristics | 0 – 0.3 | 0.1 |
PC44-TDK — frequently asked
What is PC44-TDK used for?
PC44-TDK is typically used for high-frequency SMPS transformer cores, LLC resonant converter cores, DC-DC converter inductor cores, gapped flyback transformer cores, PFC choke cores and planar and low-profile transformer cores. In short: lower loss than PC40; high-frequency power ferrite; multiple supplier equivalents.
What is the tensile strength of PC44-TDK?
PC44-TDK has a typical tensile strength of 30 MPa (4.35 ksi) — weaker than 77% of ceramic grades. Strength varies by condition: see the 3 listed tempers.
Is PC44-TDK easy to machine?
Not especially — machinability is rated not recommended (8/100, better than 69% of ceramic grades). After sintering, only diamond-wheel grinding or lapping of mating faces and air gaps is possible; no turning, milling or drilling. Grind wet and support edges to prevent corner chipping.
Can PC44-TDK be welded?
Not weldable; core halves are fixed with clips, epoxy or banding tape, and adhesive thickness in the joint shifts the A_L value.
What surface finishes work on PC44-TDK?
Mating faces are precision ground or lapped to keep the residual gap low; outer surfaces can be epoxy powder coated or parylene coated for insulation and moisture resistance, and toroids are normally coated to guarantee magnet-wire breakdown voltage.
Can PC44-TDK be formed, bent or molded?
Spray-granulated calcined powder is dry pressed into E/EE/PQ/ETD and toroid shapes, then sintered at 1280–1380 °C under controlled oxygen partial pressure with about 15–20 % linear shrinkage.
What is the maximum service temperature of PC44-TDK?
PC44-TDK is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Ferrite Cores — Material Characteristics (PC40/PC44/PC47) — TDK Corporation (2023)
- Soft Ferrites and Accessories — Data Handbook — Ferroxcube (2013)
- Soft Ferrites: Properties and Applications — Butterworth-Heinemann (E.C. Snelling) (1988)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.