PC44 DMR44
Grade
DMR44 = 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.
Values for the DMR44 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 |
|---|---|---|---|---|---|---|
DMR44This page 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-TDKDefault 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 DMR44?
PC44 DMR44 is PC44 in the DMR44 grade — 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. PC44 DMR44 has a tensile strength of 28 MPa (4.06 ksi), weaker than 82% of ceramic grades. Elongation at break is 0% and the elastic modulus is 148 GPa (21.5 Msi). PC44 DMR44 has a density of 4.8 g/cm³ (0.173 lb/in³), lighter than 52% of ceramic grades. PC44-TDK is the default condition FabDigit quotes; DMR44 is available on request or by drawing note.
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 DMR44 properties
Typical room-temperature values for PC44 DMR44; 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 DMR44 has a density of 4.8 g/cm³ (0.173 lb/in³), lighter than 52% of ceramic grades.
Mechanical12
PC44 DMR44 has a tensile strength of 28 MPa (4.06 ksi), weaker than 82% of ceramic grades. Elongation at break is 0% and the elastic modulus is 148 GPa (21.5 Msi).
Thermal5
PC44 DMR44 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 DMR44 has an electrical resistivity of 6 Ω·m.
Chemical & Environmental2
Corrosion resistance is good (55/100), worse than 77% of ceramic grades.
Sustainability3
Producing a kilogram of PC44 DMR44 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 DMR44's machinability is not recommended (8/100, better than 69% of ceramic grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with PC44 DMR44
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 DMR44 — frequently asked
What is PC44 DMR44 used for?
PC44 DMR44 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 DMR44?
PC44 DMR44 has a typical tensile strength of 28 MPa (4.06 ksi) — weaker than 82% of ceramic grades. Strength varies by condition: see the 3 listed tempers.
Is PC44 DMR44 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 DMR44 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 DMR44?
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 DMR44 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 DMR44?
PC44 DMR44 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.