SERIES
COMMERCIAL
TO-5 RELAYS
DPDT MAGNETIC LATCHING
722
SERIES
DESIGNATION
722
722D
DPDT basic relay
RELAY TYPE
DPDT relay with internal diode for coil transient suppression
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).
CENTIGRID
®
AND TO-5
PRINCIPLE OF OPERATION
PERMANENT MAGNET
MAGNETIC CIRCUIT A
Energizing Coil B produces a magnetic field
MAGNETIC CIRCUIT B
SOFT IRON FRAME
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
SOFT IRON
of the permanent magnet, becomes great
SOFT IRON
CORE A
CORE B
enough to break the armature free of Core
AIR GAP
SOFT IRON
B, and snap it into a closed position against
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
MOVING
energizing Coil A. Since operation depends
CONTACT
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.
ENVIRONMENTAL AND
PHYSICAL SPECIFICATIONS
–65°C to +125°C
Temperature Storage
(Ambient)
Operating
–55°C to +85°C
Vibration
(General Note 1)
Shock
(General Note 1)
Enclosure
Weight
10 g’s to 500 Hz
30 g’s,
6 msec, half-sine
Hermetically sealed
0.1 oz. (2.9g) max.
722 Page 96
722/1203/Q1
©2003 TELEDYNE RELAYS
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
www.teledynerelays.com
SERIES 722
GENERAL ELECTRICAL SPECIFICATIONS (@25°C) (Notes 2 & 3)
Contact Arrangement
Rated Duty
Contact Resistance
Contact Load Ratings (DC)
(See Fig. 2 for other DC
resistive voltage/current ratings)
Contact Load Ratings (AC)
2 Form C (DPDT)
Continuous
0.15 ohm max. before life; 0.25 ohm max. after life at 1A/28Vdc (measured 1/8" from header)
Resistive:
Inductive:
Lamp:
Low Level:
Resistive:
1 Amp/28Vdc
200 mA/28Vdc (320 mH)
100 mA/28Vdc
10 to 50 µA/10 to 50mV
250 mA/115Vac, 60 and 400 Hz (Case not grounded)
100 mA/115Vac, 60 and 400 Hz (Case grounded)
Contact Life Ratings
Contact Overload Rating
Contact Carry Rating
Coil Operating Power
Operate Time
Minimum Operate Pulse
Intercontact Capacitance
Insulation Resistance
Dielectric Strength
Negative Coil Transient
722D
Diode P.I.V.
722D
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
2A/28Vdc Resistive (100 cycles min.)
Contact factory
290 milliwatts typical at nominal rated voltage
2.0 ms max at nominal rated coil voltage
6.0 ms width @ rated voltage
0.4 pf typical
1,000 megohms min. between mutually isolated terminals
Atmospheric pressure: 350 Vrms/60Hz
2.0 Vdc Max.
60 Vdc Min.
DETAILED ELECTRICAL SPECIFICATIONS (@25°C) (Note 3)
BASE PART
NUMBERS
(See Note 6 for full P/N example)
Coil Voltage (Vdc)
Nom.
Max.
722-5
722D-5
5.0
6.0
61
3.5
722-6
722D-6
6.0
8.0
120
4.5
722-9
722D-9
9.0
12.0
280
6.8
722-12
722D-12
12.0
16.0
500
9.0
722-18
722D-18
18.0
24.0
1130
13.5
722-26
722D-26
26.5
32.0
2000
18.0
Coil Resistance (Ohms ±20% @25°C)
Set & Reset Voltage (Vdc, Max.) Pulse Operated
PERFORMANCE CURVES (Note 2)
TYPICAL RF PERFORMANCE
TYPICAL DC CONTACT RATING (RESISTIVE)
0
.1
.2
.3
.4
dB
INS
ERT
ION
LOS
S
300
LOAD VOLTAGE (VDC)
250
200
150
100
50
CENTIGRID
®
AND TO-5
10
20
30
40
50
60
70
.01
0.5
.1
.5
1.0
FREQUENCY (GHz)
1.92
RN
RETU
(
LOSS
)
VSWR
CTS
ONTA
ES
S POL
1.22
1.02
1.01
1.00
1.00
VSWR
O
ACR
TION
SOLA
I
SS C
1.07
TION
ISOLA
S
ACRO
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 1
FIGURE 2
722 Page 97
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
www.teledynerelays.com
©2003 TELEDYNE RELAYS
722/1203/Q1
SERIES 722
OUTLINE DIMENSIONS
CASE DETAIL
.370
(9.40)
DIA. MAX.
.335
(8.51)
DIA. MAX.
.035 (0.89)
.010 (0.25)
.280 (7.11) MAX.
7
.200 (5.08)
.010 (.25) DIA.
6
36° ±3° TYP.
5
4
COIL A
722D
SCHEMATICS ARE VIEWED FROM TERMINALS.
CONTACTS SHOWN IN POSITION RESULTING
WHEN COIL A LAST ENERGIZED.
SCHEMATIC DIAGRAM
TERMINAL LOCATIONS AND
PIN NUMBERS (REF. ONLY)
(Viewed from
Terminals)
.031 (0.79)
.003 (0.08)
10
9
8
1
2
3
COIL B
COIL B
.200 (5.08)
.010 (.25) DIA.
COIL A
722
WIRE LEAD: .75 (19.05) MIN.
(.05)
.017 (.43) +.002 (.03) DIA.
–.001
DIMENSIONS ARE SHOWN IN INCHES
(MILLIMETERS)
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
Relay Series
Optional Ground Pin
(See Appendix )
Pad Option
(See Appendix)
Q= Solder Coated Leads
G= Gold Plated Leads
(Notes 4 and 5)
S= 0.187" leads
(Note 5)
Coil Voltage
CENTIGRID
®
AND TO-5
©2003 TELEDYNE RELAYS
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
www.teledynerelays.com
722 Page 98
722/1203/Q1
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