TELEDYNE RELAYS
AEROSPACE CENTIGRID
®
MAGNETIC-LATCHING
R.F. RELAYS
DPDT
SERIES
RF120
DESCRIPTION
The RF120 Series relay is an ultraminiature, hermetically sealed,
magnetic-latching relay featuring extremely low intercontact capacitance
for exceptional R.F. performance over the full UHF spectrum. Its low
profile height and .100” grid spaced terminals (precluding the need for
spreader pads) make it ideal for applications where extreme packaging
density and/or close PC board spacing are required.
The basic design and internal structure are similar to the TO-5 421 Series
relay. The relay is capable of meeting Teledyne Relays’
T
2
R
®
requirements. The RF120 design has been optimized for use in RF
attenuators, RF switch matrices, and other applications requiring high
isolation, low insertion loss, and low VSWR.
Unique construction features and manufacturing techniques provide
overall high reliability and excellent resistance to environmental
extremes.
• All welded construction.
• Unique uni-frame design providing high magnetic efficiency and
mechanical rigidity.
• High force/mass ratios for resistance to shock and vibration.
• Advanced cleaning techniques provide maximum assurance of
internal cleanliness.
• Gold plated precious metal alloy contacts ensure reliable d.c.
switching from dry-circuit to 1/4 amp, as well as low, stable
insertion loss.
The RF120 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 RF120 Series provides a “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 flux of the per-
MAGNETIC CIRCUIT A
PERMANENT MAGNET
SOFT IRON CORE A
manent magnet in Circuit B. As this net
MAGNETIC CIRCUIT B
SOFT IRON FRAME
holding force decreases, the attractive
force in the air gap of Circuit A, which
COIL A
COIL B
also results from the flux of the perma-
nent magnet, becomes great enough to
break the armature free of Core B, and
AIR GAP
STATIONARY
SOFT IRON
snap it into a closed position against Core
ARMATURE
CONTACT
A. The armature then remains in this
position upon removal of power from
MOVING
Coil B, but will snap back into position B
CONTACT
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 followed, it is possible for the relay to be in the
magnetically neutral position.
ENVIRONMENTAL AND
PHYSICAL SPECIFICATIONS
Temperature
(Ambient)
Vibration
-65°C to + 125°C
30 g’s to 3000 Hz
(Note 3)
100 g’s for 6 msec.
(Note 3) half-sine
Shock
Acceleration
50 g’s (Note 3)
Enclosure
All welded,
hermetically sealed
0.10 oz.
(2.84 gms.) max.
Weight
54
TELEDYNE [ TELEDYNE TECHNOLOGIES INCORPORATED ]
