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.
Figure shows battery-powered
version. simple design consideration can change
the safety the operation.
T
B2 Tr
Relay coil currents consist only and B1. Place the surge
absorber (diode, etc.
/Relay coil Good Ry
Relay coil currents and electronic circuit
flow together trough and B. the base the
relay). Avoid
through-holes places which cannot be
seen from the top (e. Also, when soldering, the
solder will build eyelet condition,
increasing the mounting strength. Solder flowing through such a
hole may cause damage such a
broken seal.) near the relay coil.
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.
Keep relays away from sem iconductor
devices.g.
/
Figure 19
I
Figure 20
Figure 21
[7] BOARD DESIGN CONSIDERATIONS
1. tte s
Since relays affect electronic circuits by
generating noise, the following points
should noted. 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.
Figure shows example the
modified circuit.
28 ds_x61_en_relay_technical_information_091112D
.Applications Relays Electronic Circuits
2 tio lta o
R t
In the circuit shown Figure 19, rush
current flows from the lamp capacitor.
(No good) A
a _______
Avoid routing pattern traces susceptible
to noise (such for audio signals)
underneath the relay coil section. Design the pattern traces for
shortest lengths.
Electronic circuit currents consist only and
B2.
The instant the contacts close, the voltage
drops and the relay releases chatters.
In this case necessary raise the
transform er's capacity add smoothing
circuit
