MnZn Power Ferrite · Mid-frequency power · Material specification

TM83★ 2027 NEW

FULL-TEMPERATURE-RANGE LOW-LOSS POWER FERRITE

Server / Telecom PowerNotebook / Charger TransformerAutomotive PowerHigh-Temperature SMPS

TM83 is a full-temperature-range low-loss MnZn power ferrite with an initial permeability (μi) of 3000, a saturation flux density (Bs) of 545 mT at 25 °C (425 mT at 100 °C) and a Curie temperature of 240 °C or higher. Its distinguishing feature is the very small increase of loss with temperature: at 100 kHz / 200 mT from 240 kW/m³ at 25 °C to 250 at 100 °C, 280 at 120 °C and 320 kW/m³ at 140 °C, and at 300 kHz / 100 mT 190 / 220 / 260 / 300 kW/m³; the 140 °C value of 320 kW/m³ is still below TM80's 350 kW/m³ at 25 °C. At 100 °C the remanence (Br) is 60 mT and the coercivity (Hc) 10 A/m. Efficiency therefore does not degrade significantly when a core in a dense, thermally constrained enclosure operates at 120–140 °C. Typical applications are 100–300 kHz switch-mode supplies with elevated core temperature: server and telecom power, notebook and charger transformers and automotive supplies. Among the six mid-frequency grades TM83 is the only one with 120 °C and 140 °C loss data; below 100 °C, TM80 (100 kHz high flux) and TM81 (300 kHz) are sufficient. At 400 kHz / 125 mT it reads 630 → 820 kW/m³; at higher frequencies the mid-high-frequency grades (TM50A/TM59) should be used.

Magnetic Characteristics

Characteristic	Condition	25 ℃	100 ℃	Unit
Initial Permeability μiInitial Permeability μi	f=10 kHz, B<0.25 mT	3000 ±25%	—	—
Amplitude Permeability μaAmplitude Permeability μa	f=25 kHz, B=200 mT	˃4000	˃4200	—
Saturation Flux Density BsSaturation Flux Density Bs	1200 A/m, 100 Hz	545	425	mT
Remanence BrRemanence Br	1200 A/m, 100 Hz	70	60	mT
Coercivity HcCoercivity Hc	1200 A/m, 100 Hz	15	10	A/m
Curie Temperature TcCurie Temperature Tc	f=10 kHz, B<0.25 mT	≥240	—	℃
Density DDensity D	Archimedes method	4.9	—	g/cm³
Electrical Resistivity ρElectrical Resistivity ρ	DC Current	5	—	Ωm

Power Loss · kW/m³

Condition	25 ℃	100 ℃	120 ℃	140 ℃
100 kHz, 200 mT	240	250	280	320
300 kHz, 100 mT	190	220	260	300
400 kHz, 125 mT	630	820	970	1160

Pcv = K·f^α·B^β

Range	K	α	β
100 ℃ ≤300	4.69E-08	1.72071	2.73226
100 ℃ ≤500	9.16E-08	1.62615	2.72509

Characteristic curves

CURVE 01

CURVE 02

CURVE 03

CURVE 04

CURVE 05

Applications

Application	Role	Band	Temperature
Flyback transformer (>150 W)	First choice	≤0.3 MHz	25–140 ℃
Flyback transformer (≤150 W, by IDC)	Alternative	≤0.3 MHz	25–140 ℃
Forward transformer	First choice	≤0.3 MHz	25–140 ℃
Push-pull transformer	First choice	≤0.3 MHz	25–140 ℃
LLC / resonant & bridge transformer (incl. Lr)	First choice	≤0.3 MHz	25–140 ℃
Wide- / high-temperature power transformer (core to 140 ℃)	First choice	≤0.3 MHz	25–140 ℃
Buck output inductor	Alternative	≤0.3 MHz	25–140 ℃
Boost input inductor	Alternative	≤0.3 MHz	25–140 ℃
PFC chokes & high-current storage inductors	Alternative	≤0.3 MHz	25–140 ℃
Forward / push-pull output inductor	Alternative	≤0.3 MHz	25–140 ℃
VRM / TLVR / PoL inductor	Alternative	≤0.3 MHz	25–140 ℃
Wide-temp power inductor (core to 140 ℃)	First choice	≤0.3 MHz	25–140 ℃

Used in circuits

AlternativeBuck converter — output inductor · Buck ≦0.3 MHz AlternativeBuck converter — output inductor · VRM／TLVR ≦0.3 MHz AlternativeBoost converter — input inductor · ≦0.3 MHz AlternativeBoost PFC — PFC choke · ≦0.3 MHz AlternativeFlyback converter — energy-storage transformer · ≦150 W ≦0.3 MHz First choiceFlyback converter — energy-storage transformer · >150 W ≦0.3 MHz First choiceForward converter — transformer & output inductor · Transformer ≤0.3 MHz AlternativeForward converter — transformer & output inductor · Output inductor ≤0.3 MHz First choicePush-pull converter — centre-tapped transformer · Transformer ≤0.3 MHz AlternativePush-pull converter — centre-tapped transformer · Output inductor ≤0.3 MHz First choiceHalf-bridge LLC — transformer & resonant inductor · ≦0.3 MHz