Panasonic is part of a large worldwide groupselling relays and associated switching products under different brand names in different territories.The conditions of use in some territories may differ from those customary in Europe. In particular there are often major differences in regard to national and international specifications, such as UL, CSA, VDE, SEV, EVE, SEMKO, etc. Thus, when considering contact loads as stated in this catalogue (e.g. 10 A, 30 VDC for the SP relay) its hould be understood that these values are not necessarily an absolute maximum but tested ratings. Mostly the stated value has been tested for a certain life expectancy as stated by the manufacturer or the respective test house. Thus, under different conditions, the stated “maximum” may, in practice, be safely exceeded.
/Relay coil Good Ry
Relay coil currents and electronic circuit
flow together trough and B. Design the pattern traces for
shortest lengths.
T
B2 Tr
Relay coil currents consist only and B1.
In this case necessary raise the
transform er's capacity add smoothing
circuit.
Figure shows battery-powered
version. the base the
relay).
Keep relays away from sem iconductor
devices.
Figure shows example the
modified circuit. Place the surge
absorber (diode, etc.g.
28 ds_x61_en_relay_technical_information_091112D
.
c CO
2 r
The hole diam eter and land are made
with the hole slightly larger than the lead
wire that the com ponent may be
inserted easily. Even for the same circuit,
pattern design considerations which
minimize the influence the on/off
operations the relay coil and lamp on
other electronic circuits are necessary. Avoid
through-holes places which cannot be
seen from the top (e. Solder flowing through such a
hole may cause damage such a
broken seal. Also, when soldering, the
solder will build eyelet condition,
increasing the mounting strength.
/
Figure 19
I
Figure 20
Figure 21
[7] BOARD DESIGN CONSIDERATIONS
1.
Electronic circuit currents consist only and
B2.) near the relay coil.Applications Relays Electronic Circuits
2 tio lta o
R t
In the circuit shown Figure 19, rush
current flows from the lamp capacitor. simple design consideration can change
the safety the operation. tte s
Since relays affect electronic circuits by
generating noise, the following points
should noted.
(No good) A
a _______
Avoid routing pattern traces susceptible
to noise (such for audio signals)
underneath the relay coil section.
The instant the contacts close, the voltage
drops and the relay releases chatters
