SERIES
722
COMMERCIAL
TO-5 RELAYS
DPDT MAGNETIC LATCHING
SERIES
DESIGNATION
RELAY TYPE
722
DPDT basic relay
722D
DPDT relay with internal diode for coil transient suppression
DESCRIPTION
The Series 722D relay has discrete silicon diodes for coil transient
suppression.
The magnetic-latching TO-5 relay, originally conceived and
developed by Teledyne, has become one of the industry standards
for low-level switching from dry circuit to 1 ampere. Designed for
high-density PC board mounting, the 722 relay has become one of
the most versatile ultraminiature relays available because of its small
size and low coil power dissipation.
The Series 722 magnetic-latching relays are ideally suited for
applications where coil power dissipation must be minimized. The
relays can be operated with a short duration pulse and after the
contacts have transferred, no external coil power is required. The
magnetic-latching feature of the Series 722 provides a “memory”
capability, since the relays will not reset upon removal of coil power.
Unique construction features and manufacturing techniques provide
excellent resistance to environmental extremes and overall high reliability.
By virtue of its inherently low intercontact capacitance and contact
circuit losses, the 722 relay has proven to be an excellent
ultraminiature RF switch for frequency ranges well into the UHF
spectrum. A typical RF application for the TO-5 relay is in handheld
radio transceivers, wherein the combined features of good RF
performance, small size, low coil power dissipation and high reliability
make it a preferred method of Transmitter-Receive switching (see
Figure 1).
• 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.
• Precious metal alloy contact material with gold plating assures
excellent high current and dry circuit switching capabilities.
PRINCIPLE OF OPERATION
PERMANENT MAGNET
MAGNETIC CIRCUIT A
SOFT IRON FRAME
Energizing Coil B produces a magnetic field
MAGNETIC CIRCUIT B
opposing the holding flux of the permanent
magnet in Circuit B. As this net holding force
decreases, the attractive force in the air gap
COIL A
COIL B
of Circuit A, which also results from the flux
of the permanent magnet, becomes great
SOFT IRON
CORE A
SOFT IRON
CORE B
ENVIRONMENTAL AND
PHYSICAL SPECIFICATIONS
enough to break the armature free of Core
B, and snap it into a closed position against
AIR GAP
SOFT IRON
ARMATURE
STATIONARY
CONTACT
Core A. The armature then remains in this
position upon removal of power from Coil B,
but will snap back into 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 rated 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.
Storage
–65°C to +125°C
–55°C to +85°C
Temperature
(Ambient)
Operating
MOVING
CONTACT
Vibration
10 g’s to 500 Hz
(General Note 1)
Shock
30 g’s,
(General Note 1)
6 msec, half-sine
Enclosure
Weight
Hermetically sealed
0.1 oz. (2.9g) max.
©2003 TELEDYNE RELAYS
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
www.teledynerelays.com
722 Page 96
722/1203/Q1
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