MnZn Power Ferrite · High-frequency power · Material specification

TM63

HIGH-FREQUENCY LOW-LOSS POWER FERRITE

GaN / SiC Resonant TransformerMHz Gate-Drive / Isolation TransformerUltrasonic / Piezo DriverMHz Current TransformerHigh-Temp HF Supply

TM63 is a high-frequency MnZn power ferrite with an initial permeability (μi) of 700, a saturation flux density (Bs) of 540 mT at 25 °C (450 mT at 100 °C) and a Curie temperature above 290 °C; it has the highest usable frequency in the power series, with 450 mT retained at 100 °C (83 %). The low μi provides the widest usable band: Pcv is 70 → 80 kW/m³ at 1 MHz / 50 mT, 200 → 250 kW/m³ at 2 MHz / 50 mT and 140 → 180 kW/m³ at 3 MHz / 30 mT. The fine-grained low-μi material has a narrow sintering window and is not produced in large cores; its scope is small MHz-class transformers with limited flux swing: GaN/SiC resonant transformers (1–3 MHz), MHz-class isolation and gate-drive transformers, ultrasonic and piezo driver transformers (1–5 MHz), and small high-frequency supplies in high-temperature environments such as automotive engine compartments. It is not suited to high-current single-turn storage inductors (the lowest DC-bias capability of the eight grades measured, I@90 % = 41.7 A at 100 °C, 220 nH band): MHz-class inductors should use TM65 (TM61 as alternate), and 1–3 MHz transformers needing higher μi may use TM61.

Magnetic Characteristics

Characteristic	Condition	25 ℃	100 ℃	Unit
Initial Permeability μiInitial Permeability μi	100 kHz & <0.2 mT	700±25%	—	—
Amplitude Permeability μaAmplitude Permeability μa	25 kHz/400 mT	> 1400	> 1200	—
Saturation Flux Density BsSaturation Flux Density Bs	1200 A/m 50 Hz	540	450	mT
Remanence BrRemanence Br	1200 A/m 50 Hz	100	90	mT
Coercivity HcCoercivity Hc	1200 A/m 50 Hz	20	15	A/m
Loss FactorLoss Factor	1 MHz	<6	<30	10⁻⁶
Curie Temperature TcCurie Temperature Tc	100 kHz & <0.2 mT	>290	—	℃
Density DDensity D	Archimedes method	>4.85	—	g/cm³
Electrical Resistivity ρElectrical Resistivity ρ	DC Current	10	—	Ω·m

Power Loss · kW/m³

Condition	25 ℃	100 ℃	Condition	25 ℃	100 ℃
500 kHz/100 mT	400	600	2 MHz/50 mT	200	250
1 MHz/50 mT	70	80	3 MHz/30 mT	140	180

Pcv = K·f^α·B^β

Range	K	α	β
100 ≤500	2.80E-08	0.989056	3.83745
100 ≤1000	5.27E-09	1.13879	3.96891
100 ≤5000	3.57E-07	1.93874	1.47495

Characteristic curves

CURVE 01

CURVE 02

CURVE 03

CURVE 04

CURVE 05

CURVE 06

Applications

Application	Role	Band	Temperature
LLC / resonant & bridge transformer (incl. Lr)	First choice	1–5 MHz	40–80 ℃
Small-size MHz transformer (1–5 MHz)	First choice	1–5 MHz	40–80 ℃
Small-power HF transformer (low flux)	First choice	1–5 MHz	40–80 ℃
Buck output inductor	Alternative	0.8–5 MHz	—
Pulse & gate-drive transformer	Alternative	1–5 MHz	—
Wideband signal transformer / balun	First choice	1–5 MHz	—
Current transformer	Alternative	1–5 MHz	—

Used in circuits

AlternativeBuck converter — output inductor · Buck 0.8–3 MHz First choiceHalf-bridge LLC — transformer & resonant inductor · 1–5 MHz First choiceSignal transformers — wideband, balun, current transformer · 1–5 MHz (signal)AlternativeSignal transformers — wideband, balun, current transformer · 1–5 MHz（CT）AlternativeSignal transformers — wideband, balun, current transformer · 1–5 MHz (pulse/gate)