TELEDYNE RELAYS
ULTRAMINIATURE
MAGNETIC LATCHING
TO-5 RELAYS SPDT
DC TO C BAND
SERIES
RF341
DESCRIPTION
The RF341 series relay is an ultraminiature, hermetically
sealed, magnetic latching relay featuring extremely low
intercontact capacitance for exceptional RF performance
well into the C band. It’s low profile and small size make it
ideal for for applications where extreme packaging density
and/or close PC board spacing are required. Due to its
minimal mass, many relays may be used to configure
replacements for bulkier switching solutions at a
substantial savings in weight
The basic operating mechanism is similar to the TO-5 422
series relay. In addition, the RF341 design has been
optimized by increasing the distance between the set/reset
contacts. This design improvement make these unique
relays the perfect choice for use in RF attenuators, RF
switching matrices and other RF applications requiring
high isolation, low insertion loss and low VSWR.
The following unique construction features and
manufacturing techniques provide overall high reliability
and excellent resistance to environmental extremes:
• Minimum mass components and welded construction
provide maximum resistance to shock and vibration.
• Uni-frame motor design provides high magnetic
efficiency and mechanical rigidity.
• Advanced cleaning techniques provide maximum
assurance of internal cleanliness.
• Gold plated precious metal contacts ensure reliable, low
level switching.
The RF341 relay is ideally suited for applications where
power dissipation must be minimized. The relays can be
operated with a short duration pulse. After the contacts
have transferred, no external holding power is required.
The magnetic latching feature of the RF341 series
provides a non volatile memory capability since the
relays will not reset upon removal of coil power.
PRINCIPLE OF OPERATION
Energizing Coil B produces a
magnetic field opposing the holding
PERMANENT MAGNET
MAGNETIC CIRCUIT A
SOFT IRON CORE A
N
MAGNETIC CIRCUIT B
SOFT IRON FRAME
Circuit B. As this net holding force
COIL B
COIL A
decreases, the attractive force in the
SOFT IRON
air gap of Circuit A, which also results
ARMATURE
STATIONARY
CONTACT
from the flux of the permanent
MOVING
CONTACT
magnet, becomes great enough to
break the armature free of Core B and
snap it in position against Core A. The
armature then remains in this position
upon removal of power from Coil B, but will snap back to position B upon
energizing Coil A. Since operation depends upon cancellation of a magnetic field, it
is necessary to apply the correct polarity to the relay coils as indicated on the relay
schematic.
When latching relays are installed in equipment, the latch and reset coils should
not be pulsed simultaneously. Coils should not be pulsed with less than the
nominal coil voltage and the pulse width should be a minimum of three times the
specified operate time of the relay. If these conditions are not observed, It is
possible for the relay to be in a magnetically neutral position. Should this happen
however, pulsing one coil or the other, as prescribed, will bring the relay back into
proper operating condition.
EW
Shock
Weight
ENVIRONMENTAL AND
PHYSICAL SPECIFICATIONS
Temperature
( Ambient )
Vibration
-55° C to
+85° C
30G to 2,000
Hz (note 1)
75G for 6 ms
(note 1)
50G
Hermetically
sealed
0.09 oz.
(2.52 gm)
max.
Acceleration
Enclosure
TELEDYNE [ TELEDYNE TECHNOLOGIES INCORPORATED ]
