SERIES
MAGNETIC-LATCHING
ESTABLISHED RELIABILITY
TO-5 RELAYS
DPDT
SERIES
DESIGNATION
420/422
420D/422D
420DD/422DD
DPDT basic relay
DPDT relay with internal diode for coil transient suppression
DPDT relay with internal diodes for coil transient suppression and polarity
reversal protection
RELAY TYPE
420/422
ESTABLISHED RELIABILITY
DESCRIPTION
The Series 420D/422D and 420DD/422DD utilize discrete diodes for
coil suppression and polarity reversal protection.
By virtue of its inherently low intercontact capacitance and contact
circuit losses, these TO-5 relays have proven to be excellent
ultraminiature RF switches for frequency ranges well into the UHF
spectrum. A typical RF application for these TO-5 relays is in
handheld radio receivers, wherein the combined features of good RF
performance, small size, very low coil power dissipation and high
reliability make it a preferred method of transmit-receive switching
(see Figure 1).
The Series 420/422 magnetic-latching relays are 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 Series 420/422 relays provide
a “memory” capability, since the relays will not reset upon removal of
coil power.
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, its small size and low coil power
dissipation make the 420 and 422 relays some of the most versatile
ultraminiature relays available.
The following 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 contacts material with gold plating assures
excellent high current and dry circuit switching capabilities.
PERMANENT MAGNET
MAGNETIC CIRCUIT A
SOFT IRON FRAME
PRINCIPLE OF OPERATION
MAGNETIC CIRCUIT B
+
+
Energizing Coil B produces a magnetic field
COIL A
COIL B
opposing the holding flux of the permanent magnet
SOFT IRON
in Circuit B. As this net holding force decreases, the
SOFT IRON
COIL A
COIL B
-
-
attractive force in the air gap of Circuit A, which also
AIR GAP
SOFT IRON
ARMATURE
results from the flux of the permanent magnet,
STATIONARY
CONTACT
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
MOVING
CONTACT
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 magnetic neutral position.
ENVIRONMENTAL AND
PHYSICAL SPECIFICATIONS
Temperature
(Ambient)
Vibration
(General Note 1)
Shock
(General Note 1)
Acceleration
Enclosure
Weight
–65°C to +125°C
30 g’s to 3000 Hz
100 g’s,
6 msec, half-sine
50 g’s
Hermetically sealed
0.10 oz. (2.84g) max.
420 422 Page 62
420 422/1203/Q1
©2003 TELEDYNE RELAYS
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
www.teledynerelays.com
SERIES 420/422
GENERAL ELECTRICAL SPECIFICATIONS (–65°C to +125°C unless otherwise noted) (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)
Contact Life Ratings
Contact Overload Rating
Contact Carry Rating
Coil Operating Power
Operate Time
Contact Bounce
Minimum Operate Pulse
Intercontact Capacitance
Insulation Resistance
Dielectric Strength
Negative Coil Transient (Vdc)
Diode P.I.V. (Vdc)
2 Form C (DPDT)
Continuous
0.125 ohm max. before life; 0.225 ohm max. after life at 0.5A/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)
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 @ 25°C
420/422, 420D/422D: 1.5 msec max. at nominal rated coil voltage
420DD/422DD: 2.0 msec max. at nominal rated coil voltage
2.0 msec max.
4.5 msec width @ rated voltage
0.4 pf typical
10,000 megohms min. between mutually isolated terminals
Atmospheric pressure: 500 Vrms/60Hz
70,000 ft.: 125 Vrms/60Hz
420D/422D, 420DD/422DD
1.0 max
420D/422D, 420DD/422DD
100 min.
ESTABLISHED RELIABILITY
DETAILED ELECTRICAL SPECIFICATIONS (–65°C to +125°C unless otherwise noted) (Note 3)
BASE PART
NUMBERS
(See Note 8 for full P/N example)
Coil Voltage (Vdc)
Coil Resistance
(Ohms ±10% @25°C)
Coil Current (mAdc @25°C)
(420DD/422DD Series only)
Set & Reset Voltage
(Vdc, Max.)
Nom.
Max.
420/422,
420D/420D
420DD/422DD
(Note 4)
Min.
Max.
420/422,
420D/422D
420DD/422DD
420/422-5
420D/422D-5
420DD/422DD-5
420/422-6
420D/422D-6
420DD/422DD-6
420/422-9
420/422-12
420/422-18
420/422-26
420D/422D-9
420D/422D-12
420D/422D-18
420D/422D-26
420DD/422DD-9 420DD/422DD-12 420DD/422DD-18 420DD/422DD-26
5.0
6.0
61
48
75.8
104.2
3.5
4.5
6.0
8.0
120
97
46.9
63.0
4.5
5.5
9.0
12.0
280
280
26.0
33.7
6.8
7.8
12.0
16.0
500
500
20.0
25.5
9.0
10.0
18.0
24.0
1130
1130
13.7
17.2
13.5
14.5
26.5
32.0
2000
2000
11.6
14.4
18.0
19.0
PERFORMANCE CURVES
(NOTE 2)
TYPICAL RF PERFORMANCE
TYPICAL DC CONTACT RATING (RESISTIVE)
0
.1
.2
.3
.4
dB
INS
ERT
ION
LOS
300
S
LOAD VOLTAGE (VDC)
250
200
150
100
50
10
20
30
40
50
60
70
.01
0.5
IS
1.92
RN
RETU
AC
TION
OLA
IS
LOSS
ROS
(VSW
R)
1.22
1.02
1.01
1.00
1.00
.5
1.0
VSWR
SC
S
ACT
ONT
OLES
1.07
CR
ION A
OLAT
OSS P
.1
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
FREQUENCY (GHz)
LOAD CURRENT (AMPS DC)
FIGURE 1
FIGURE 2
420 422 Page 63
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
www.teledynerelays.com
©2003 TELEDYNE RELAYS
420 422/1203/Q1
SERIES 420/422
OUTLINE DIMENSIONS
CASE DETAIL
.370
(9.40)
DIA. MAX.
.335
(8.51)
DIA. MAX.
.035 (.89)
±
.010 (0.25)
.035 (.89)
±
.010 (0.25)
TERMINAL LOCATIONS AND PIN NUMERING (REF ONLY)
(Viewed from Terminals)
.031 (.79)
±
.003 (0.08)
.031 (.79)
±
.003 (0.08)
10
9
8
7
36°
±3°
TYP.
1
2
3
.280 (7.11) MAX.
WIRE LEAD: .75 (19.05) MIN.
PIN: .187 (4.75)
±
.010 (.25)
(See Note 6)
.200 (5.08)
±
.010 (.25) DIA.
36°
±3°
TYP.
.200 (5.08)
±
.010 (.25) DIA.
6
5
4
420
422
ESTABLISHED RELIABILITY
+.002 (.05)
.017 (.43) –.001 (.03) DIA.
DIMENSIONS ARE SHOWN IN INCHES (MILLIMETERS)
SCHEMATIC DIAGRAMS
COIL B
COIL B
COIL B
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. For reference only. Coil resistance not directly measurable
at relay terminals due to internal series diode. 420DD and
422DD only.
5. Unless otherwise specified, relays will be supplied with
either gold-plated or solder-coated leads.
6. The slash and characters appearing after the slash are
not marked on the relay.
7. Screened HI-REL versions available. Contact factory.
8.
COIL A
COIL A
COIL A
420
COIL B
COIL B
420D
COIL B
420DD
COIL A
COIL A
COIL A
422
422D
422DD
SCHEMATICS ARE VIEWED FROM TERMINALS
CONTACTS SHOWN IN POSITION RESULTING WHEN COIL A LAST ENERGIZED
Teledyne Part Numbering System for
T
2
R
® Established Reliability Relay
ER
Established Reliability
Designator
422 X
M - 26
A / S Q
Q= Solder Coated Leads
G= Gold Plated Leads
(Notes 5 and 6)
S= 0.187" leads
(Note 6)
Screening and Reliability
Level
Coil Voltage
Relay Series
Optional Ground Pin
(See Appendix)
Pad Option
(See Appendix)
Teledyne Part Numbering System for Military Qualified (JAN) Relays
J
Military (JAN)
Designator
422 X
M -
26
P
L
Screening and Reliability
Level
Terminal Variant
P = 0.187"
Coil Voltage
Relay Series
Optional Ground Pin
(See Appendix)
Pad Option
(See Appendix)
©2003 TELEDYNE RELAYS
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
www.teledynerelays.com
420 422 Page 64
420 422/1203/Q1
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