B-20 Datasheet, PDF (1/6 Pages) Kemet Corporation – B-20 Series Bead Cores

EMI Cores
B-20 Series Bead Cores
Overview
Benefits
EMI Cores
Applications
KEMET B-20 Series bead cores are
• MnZn ≤ 100 MHz (AM b^Raⁱⁿn^gd^Tr^ya^pn^ege)
• Consumer electronics
designed for use on round cable. The
wide range of Manganese Zinc (MnZn)
and Nickel Zinc (NiZn) options allows for
targeting of specific frequency ranges.
EMI cores are part of a family of passive
components which address the issues
and NiZn ≤ 300 MHz (FM b_Ta_ipn_sd_or_nan_Eg_Me)_{I Core Usages}
E^oM^pI^tiC^oo^nsre^as^vailable
• _RS_ino_gl_Tid_ypc_eonstruction
Characteristics and how to count turns
Tips on EMI Core Usages
　Number of turns are counted by how many times the lead wire
hole of the core. Do not count the number of lead wire winding
of noise or electromagnetic interference
(EMI) in circuits or systems.
EMI Cores
C_　ha_Nr_ua_mct_be_eri_rs_oti_fc_ts_ua_rnn_sd_ah_reo_cw_outo_ntc_eo_du_　bn_yWt_ht_ohu_wern_nms_{daneysitriemdeps tehrefolermadawnicree}
can
pa
not
be
obtained just b
sses through
the
inner
hole of the core. Do not count the^van^lu^um^eb^ce^arⁿof^bl^eea^rd^aiw^seir^de w^binding^{y increasing t}o^hutsid^ee t^th^ue^rnco^. r^Ieⁿ, a^ts^hiⁱt^sr^ce^asu^sl^ets^{, the}
be checked that it is in the desired range as adding turns resu
Ring Type
　When desired performance can not be obtained just b
y 1 turn, impedance characteristics
Turns and Impedance Characteristics _{Tips on EMI Core Usages}
value can be raised b y increasing th e turn. In this case, the
be checked that it is in the d^Feⁱs^gi^ure^red¹ra^–n^Hge^owas^toad^cd^oi^unⁿg^t t^tuu^rrⁿn^ss resu
e frequency band sho（ulRdep
lts in lowering¹⁰⁰d⁰⁰own the
When the desired performance of an EMI core cannot be
obtained with a single pass through the co^Cr_　e^h,^a_N^rt_u^ah_m^ce^t_b^ei_e^rmⁱ_r^s_op^ti_f^ce_t^s_ud^a_ra_nⁿn_s^dc_a^h_re_e^o_c^w_ou^to_nt^c_e^o_d^u_bⁿ_y^t_h^t_o^u_w^rn_m^s_{any times the lead wire pa}
characteristics can be changed with multipl_he_olt_eu_or_fn_ts_h._{e core. Do not count the number of lead wire winding}
（Represe ntative Example：ESD-R-11600C0）
10000
sses through the inner
Resonance point changes to lower
outside the core, as it results
1000
3T
100
A turn is counted by the number of lead-wir_　e_Ww_hin_end_din_eg_sis_redw_ph_ei_rc_foh_{rmance can not be obtained just b}
pass through the inner hole of the core. Win^vad^luin^eg^casⁿo^bn^{e r}t^ah^ise^{ed b y increasing th e turn. In this ca1sTe, the}
y1
turn, ₁i₀₂m_{0Tepefrdeaqnuceencchyabraancdte32srTThisotiuclsd}
1T
10
outside
of
the
core
do
not
count.
See
Figur^be^e1^chfo^ecr^ke^ex^da^thm^ap^{t i}le^{t i}s^s
in
the
1T
desired
range as
2T
add_Fin_igg_ut_r*u_eNr_u2n_m3s_–bTr_ee_{Rr o}s_efu_{llaeatdiownirsehwipoubnedto1w0utes}l_eit_ds_nei_tin_hmelo_pcoew_rede_a+r_n1in_cg_e d_ao_nw_d n_tut_rh_ne_count.
1
of one, two, and three turns.
(Repr⁼e^Ns^ue^mn^bta^et^ri^ov^fe^ree^ax^da^wm^irp^e l^pe^a:^sE^seS^s D^th-^roR^u-^g1^h6^tC^h)^{e inner}
hol（e oRf ethperceosree ntative Example：ESD-R-16C）
1
*=NNumumbebreorfolefardeawdirwe _{iwreoupnadssoeusttshidreotuhgehcothree+in1}1_{=n00eT0r0urn count}
hole of the core
1
1
Resonance po¹i⁰nt changes to lower band¹⁰⁰
1000
Adding turns will result in higher impedance while also _{= Turn count}
1000 ^{Fig.1　How to}3T^{count turns}
Frequency (MHz)Fig.2　Relationship b
lowering the effective frequency range. See Figure 2 for an _{Fig.1　How to count turns}
Fig.2　Relationship between impedance an
d turn count
example.
2T
　There
are
two
materials
of
　T¹⁰h⁰ ere
ferrite, Ni-Zn
s^ae^rr^eie^ts^wa^ond^mM^a1n^tT-^eZ^rn^ias^le^sr^of
ferrite,
Ni-Zn series
ies. Ni-Zn
and Mn-Zn
series is
ser
e
Core Material and Effective Frequency Range ^1T
2T
3T
10
There
are
two
ferrite
material
options
for
*Number of lead wire wound^　ou^Ntsi^ode^tethe^thco^are^t+^a1^bove
KEMET ⁼
Number of
hole of the
read
core
w
ire
pa_wsse_its_hth_aro_cu_tg_uh_at_lhe_inin_sn_te_rur _ment
is
　Note that above
ive for kHz
e band range i
e band range i
s a reference only. Examination of
necessa^wry.^{ith1 a}1 ^{ctual instru}1^m0 ^{ent is nece}10^s0^sary.
1000
band
sa
range.
reference
s
EMI Cores: Nickel Zinc (NiZn) and Manganes^{= T}e^{urn count}
　As Mn-Zn series has lower res^　ist^Aa^sn^Mceⁿc^-o^Zmⁿp^sa^ere^rid^eFrt^seo^qhuN^aeiⁿ-^scZ^yln^o(Ms^we^Her^zi^)re^rs^e, ^{sistance comp}m^aa^rk^ee^ds^tu^ore^Nto^i-Zprⁿo^sv^eid^reⁱ
Zinc (MnZn). Each core
resistance and effective
material has a different ^{Fig.1　How}
frequency range. The MnZn
toacdouenqtutuartnesinsulation before uFsige.2. 　aRdeelaqtiounashtiep binetswueleantiimopnedbaenfcoe raen use.
d turn counts
Mn-Z^F(n_Ris^gee^upr^ri_re^ees_s3v_es^–nN_tEai-^ftZ^fiven_ecs^teie^vxr^ei_ae_mbs ^apnled,rma_M^ne｜^ga_n^eZ_s-｜_uZ^o-_rn^ff_eMC_dsh_e^nwa_r^Z_ir_ieta^nhc_s^at_sve^na_sr^di_ms_Nt^Nei_ic_-^i-s^Z_Zd(ⁿⁱ_nr_me^f_sp^ee_er^rne^r_rsiis^t_eiee_osn_nct^oa_rit^rni^ev_ge^mce^aox^tra^e_｜em^r)i_Z^ap_｜^ll^.e_-)_f
Characteristics
(r
core
material
has
a
lower
resistance
compa^　re^Thd^ert^eo^are
two
materials
of
ferrite,
1000
Ni-Zn^(ms^ee^ar^sie^us^rea^mn^ed^ntM^conⁿ-Z^din^tiosⁿe^:r^measured
1000
with
sa₍m_miee_es-_ad_{. s}i_Nm_uire_-eZn_ms_nio_esn_enr_rti_in_ceg_osnc_iso_dr_ie_t)_{ion: meeasured}
ive for kHz band range.
with
same-dimensi
the NiZn; therefore, adequate insulation is r_　eq_Nu_oi_tr_ee_td_{hat above}
e band range i
s a reference only. Examination of
s
before use.
with actual instrument is necessary.
AM band range
FM band range
　As Mn-Zn series has lower resistance compared to Ni-Zn series,
The NiZn core material is typically effective^adfo^eqr^{uate insulation before use. 100}
NiZn^As^Mmerie^abs^kac^neor^de^{surarnegteo provide}
frequencies in the MHz band range such as the Mn-Zn series vs Ni-Zn series
100
｜Z｜-_Mf _nC_Zh_na_ser_ra_iec_st_ce_or_ri_estics (representative example)
NiZn ser
FM-band, while the MnZn core material is typically
1000
effective for the kHz band range such as the AM-
(measurement condition: measured with same-dimension ring core)
10
MnZn series core
band. See Figure 3.
AM band range
10 FM band range
It is recommended to measure the actual frequency¹⁰⁰
NiZn series core
range effectiveness in the target application.
1
MnZn serie^0.s⁰¹core
0.1
1
10
Frequency (MHz)
100
1000
1
10
Fig.3　
0.01
0_O.1_{ne world. On}^te_e1_KEMET
10
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 [phone] • www.kemet.com
E5009_B-20 • 3/25/2F0re1q5uenc1y (MHz)
EMI
Fig.3　
1