©2003 TELEDYNE RELAYS SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE 722 Page 96
www.teledynerelays.com 722/1203/Q1
CENTIGRID®AND TO-5
SERIES
722
COMMERCIAL
TO-5 RELAYS
DPDT MAGNETIC LATCHING
DESCRIPTION
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.
Unique construction features and manufacturing techniques provide
excellent resistance to environmental extremes and overall high reliability.
• 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.
The Series 722D relay has discrete silicon diodes for coil transient
suppression.
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.
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).
PRINCIPLE OF OPERATION
Energizing Coil B produces a magnetic field
opposing the holding flux of the permanent
magnet in Circuit B. As this net holding force
decreases, the attractive force in the air gap
of Circuit A, which also results from the flux
of the permanent magnet, becomes great
enough to break the armature free of Core
B, and snap it into a closed position against
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.
SERIES
DESIGNATION RELAY TYPE
722 DPDT basic relay
722D DPDT relay with internal diode for coil transient suppression
SOFT IRON
ARMATURE
SOFT IRON
CORE B
COIL B
MAGNETIC CIRCUIT B
PERMANENT MAGNET MAGNETIC CIRCUIT A
SOFT IRON FRAME
COIL A
SOFT IRON
CORE A
AIR GAP
STATIONARY
CONTACT
MOVING
CONTACT
ENVIRONMENTAL AND
PHYSICAL SPECIFICATIONS
Temperature
(Ambient)
Storage –65°C to +125°C
Operating –55°C to +85°C
Vibration
(General Note 1) 10 g’s to 500 Hz
Shock
(General Note 1) 30 g’s,
6 msec, half-sine
Enclosure Hermetically sealed
Weight 0.1 oz. (2.9g) max.
722 Page 97 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE ©2003 TELEDYNE RELAYS
www.teledynerelays.com 722/1203/Q1
CENTIGRID®AND TO-5
0
.1
.2
.3
.4
10
20
30
40
50
60
70 .01 0.5 .1 .5 1.0
FREQUENCY (GHz)
FIGURE 1
TYPICAL RF PERFORMANCE
1.92
1.22
1.07
1.02
1.01
1.00
1.00
VSWR
300
250
200
150
100
50
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
LOAD CURRENT (AMPS DC)
FIGURE 2
TYPICAL DC CONTACT RATING (RESISTIVE)
LOAD VOLTAGE (VDC)
dB
RETURN LOSS (VSWR)
INSERTION LOSS
ISOLATION ACROSS CONTACTS
ISOLATION ACROSS POLES
SERIES 722
GENERAL ELECTRICAL SPECIFICATIONS (@25°C) (Notes 2 & 3)
DETAILED ELECTRICAL SPECIFICATIONS (@25°C) (Note 3)
Contact Arrangement 2 Form C (DPDT)
Rated Duty Continuous
Contact Resistance 0.15 ohm max. before life; 0.25 ohm max. after life at 1A/28Vdc (measured 1/8" from header)
Contact Load Ratings (DC)
(See Fig. 2 for other DC
resistive voltage/current ratings)
Resistive: 1 Amp/28Vdc
Inductive: 200 mA/28Vdc (320 mH)
Lamp: 100 mA/28Vdc
Low Level: 10 to 50 µA/10 to 50mV
Contact Load Ratings (AC) Resistive: 250 mA/115Vac, 60 and 400 Hz (Case not grounded)
100 mA/115Vac, 60 and 400 Hz (Case grounded)
Contact Life Ratings 10,000,000 cycles (typical) at low level
1,000,000 cycles (typical) at 0.5A/28Vdc resistive
100,000 cycles min. at all other loads specified above
Contact Overload Rating 2A/28Vdc Resistive (100 cycles min.)
Contact Carry Rating Contact factory
Coil Operating Power 290 milliwatts typical at nominal rated voltage
Operate Time 2.0 ms max at nominal rated coil voltage
Minimum Operate Pulse 6.0 ms width @ rated voltage
Intercontact Capacitance 0.4 pf typical
Insulation Resistance 1,000 megohms min. between mutually isolated terminals
Dielectric Strength Atmospheric pressure: 350 Vrms/60Hz
Negative Coil Transient 722D 2.0 Vdc Max.
Diode P.I.V. 722D 60 Vdc Min.
PERFORMANCE CURVES (Note 2)
BASE PART
NUMBERS
(See Note 6 for full P/N example)
722-5
722D-5
722-6
722D-6
722-9
722D-9
722-12
722D-12
722-18
722D-18
722-26
722D-26
Coil Voltage (Vdc) Nom. 5.0 6.0 9.0 12.0 18.0 26.5
Max. 6.0 8.0 12.0 16.0 24.0 32.0
Coil Resistance (Ohms ±20% @25°C) 61 120 280 500 1130 2000
Set & Reset Voltage (Vdc, Max.) Pulse Operated 3.5 4.5 6.8 9.0 13.5 18.0
©2003 TELEDYNE RELAYS SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE 722 Page 98
www.teledynerelays.com 722/1203/Q1
CENTIGRID®AND TO-5
.370
(9.40)
DIA. MAX.
CASE DETAIL
.335
(8.51)
DIA. MAX.
.280 (7.11) MAX.
WIRE LEAD: .75 (19.05) MIN.
.017 (.43) DIA.
+.002 (.05)
–.001 (.03)
.031 (0.79)
.003 (0.08)
36° ±3° TYP.
.035 (0.89)
.010 (0.25)
.200 (5.08)
.010 (.25) DIA.
.200 (5.08)
.010 (.25) DIA.
1
2
3
4
5
6
7
8
9
10
DIMENSIONS ARE SHOWN IN INCHES (MILLIMETERS)
TERMINAL LOCATIONS AND PIN NUMBERS (REF. ONLY)
(Viewed from Terminals)
SCHEMATICS ARE VIEWED FROM TERMINALS.
CONTACTS SHOWN IN POSITION RESULTING
WHEN COIL A LAST ENERGIZED.
722D
COIL B
COIL A
722 COIL A
COIL B
SERIES 722
OUTLINE DIMENSIONS SCHEMATIC DIAGRAM
GENERAL NOTES
1. Relay contacts will exhibit no chatter in excess of 10 µsec or transfer in excess of
1 µsec.
2. “Typical” characteristics are based on available data and are best estimates. No on-
going verification tests are performed.
3. Unless otherwise specified, parameters are initial values.
4. Unless otherwise specified, relays will be supplied with either gold-plated or solder-
coated leads.
5. The slash and characters appearing after the slash are not marked on the relay.
6.
Teledyne Part Numbering System for Commercial Relays
722 X M - 26 / S Q
Pad Option
(See Appendix)
Relay Series
Optional Ground Pin
(See Appendix )
Coil Voltage
Q= Solder Coated Leads
G= Gold Plated Leads
(Notes 4 and 5)
S= 0.187" leads
(Note 5)
