Products » EPCOS AG Ferrites and Cores » EPCOS ferrite materials »

Electromagnetic parameters of Epcos ferrite materials and recommendations for choosing.

Power materials

For Power transformers:

For frequency f<100 kHz

• N27 (µi = 2000) base power materials, low cost, hi-power
• N41 (µi = 2800) applied in current transformers

For frequency f<500 kHz

• N87 (µi = 2200) base power material
• N97 (µi = 2300) the lowest losses
• N95 (µi = 2000) low losses, flat temperature behavior, the dependence of core losses from temperature is close to linear
• N51 (µi = 3000) losses min. at 40°C

For frequency f>500 kHz

• N49 (µi = 1500)

Output choke (high B_sat @ 100°C)

• N87 (µi = 2200) standard
• N92 (µi = 1500) higher saturation
• N93 (µi = 1250*) highest saturation

Ballast

• N72 (µi = 2500) N72 (µi = 2500 ) low B_r , near flat temperature behaviour

 

Broadband

Signal transformer (low THD)

ADSL

• T38 (µi = 10000) base material with high permeability
• T66 (µi = 13000) ADSL2

SHDSL

• T57 (µi = 4000)

VDSL

• M33 (µi = 750)

Splitter (high B_sat @room temperature)

• N45 (µi = 3800)

 

Resonance circuit

Filter coil (low tan d/µi, high Q, stable µi over T)

f<100 kHz

• N48: (µi = 10000) stable impedance over temperature
• N45: (µi = 3800) high B_sat

f<1 MHz

• M33 (µi = 750)

f>1 MHz

• K1 (µi = 80)

 

Proximity switch

Sensor coil (high and stable Q over T)

f<100 kHz

• N22: (µi = 2300)

f<1 MHz

• M33 (µi = 750)

f>1 MHz

• K1 (µi = 80)

 

EMI

Current-compensated choke (high impedance)

• N30: (µi = 4300) extended frequency response
• T35: (µi = 6000) medium permeability
• T36: (µi = 7000) stable impedance over temperature
• T37: (µi = 6500) low tanδ/µ_i
• T38: (µi = 10000) high Inductance low η_B
• T65: (µi = 5200) high B_sat and high T_c
• T46: (µi = 15000) highest permeability

Filter choke (high impedance)

• T36: (µi = 7000) stable impedance over temperature
• T65: (µi = 5200) high B_sat and high T_c

Data line choke (high data rate)

• M13: (µi = 2300) high frequency, high permeability
• K8: (µi = 860) highest frequency
• K10: (µi = 800) highest frequency