SERIES
420/422
MAGNETIC-LATCHING
ESTABLISHED RELIABILITY
TO-5 RELAYS
DPDT
SERIES
RELAY TYPE
DESIGNATION
420/422 DPDT basic relay
420D/422D DPDT relay with internal diode for coil transient suppression
DPDT relay with internal diodes for coil transient suppression and polarity
420DD/422DD
reversal protection
The Series 420D/422D and 420DD/422DD utilize discrete diodes for
DESCRIPTION
coil suppression and polarity reversal protection.
The magnetic-latching TO-5 relay, originally conceived and
developed by Teledyne, has become one of the industry standards
By virtue of its inherently low intercontact capacitance and contact
for low-level switching from dry circuit to 1 ampere. Designed for
circuit losses, these TO-5 relays have proven to be excellent
high-density PC board mounting, its small size and low coil power
ultraminiature RF switches for frequency ranges well into the UHF
dissipation make the 420 and 422 relays some of the most versatile
spectrum. A typical RF application for these TO-5 relays is in
ultraminiature relays available. handheld radio receivers, wherein the combined features of good RF
performance, small size, very low coil power dissipation and high
The following unique construction features and manufacturing reliability make it a preferred method of transmit-receive switching
techniques provide excellent resistance to environmental extremes (see Figure 1).
and overall high reliability:
All welded construction. The Series 420/422 magnetic-latching relays are ideally suited for
Unique uni-frame design providing high magnetic efficiency and applications where power dissipation must be minimized. The relays
mechanical rigidity. can be operated with a short duration pulse. After the contacts have
High force/mass ratios for resistance to shock and vibration. transferred, no external holding power is required.
Advanced cleaning techniques provide maximum assurance of
internal cleanliness. The magnetic latching feature of the Series 420/422 relays provide
Precious metal alloy contacts material with gold plating assures a memory capability, since the relays will not reset upon removal of
excellent high current and dry circuit switching capabilities. coil power.
PERMANENT MAGNET MAGNETIC CIRCUIT A
MAGNETIC CIRCUIT B
SOFT IRON FRAME
PRINCIPLE OF OPERATION
+
Energizing Coil B produces a magnetic field
COIL A
COIL B
opposing the holding flux of the permanent magnet
ENVIRONMENTAL AND
SOFT IRON SOFT IRON
in Circuit B. As this net holding force decreases, the
COIL A
COIL B PHYSICAL SPECIFICATIONS
-
attractive force in the air gap of Circuit A, which also
AIR GAP
SOFT IRON
ARMATURE
results from the flux of the permanent magnet, Temperature
STATIONARY
CONTACT 65C to +125C
becomes great enough to break the armature free (Ambient)
of Core B, and snap it into a closed position against
Vibration
Core A. The armature then remains in this position
MOVING
30 gs to 3000 Hz
CONTACT
(General Note 1)
upon removal of power from Coil B, but will snap
back into position B upon energizing Coil A. Since operation depends upon cancellation
Shock 100 gs,
of a magnetic field, it is necessary to apply the correct polarity to the relay coils as
(General Note 1) 6 msec, half-sine
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
Acceleration 50 gs
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
Enclosure Hermetically sealed
for the relay to be in the magnetic neutral position.
Weight 0.10 oz. (2.84g) max.
2003 TELEDYNE RELAYS SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE 420 422 Page 1
www.teledynerelays.com 420 422/1203/Q1
ESTABLISHED RELIABILITY
-
+ESTABLISHED RELIABILITY
INSERTION LOSS
SERIES 420/422
GENERAL ELECTRICAL SPECIFICATIONS (65C to +125C unless otherwise noted) (Notes 2 & 3)
Contact Arrangement 2 Form C (DPDT)
Rated Duty Continuous
Contact Resistance 0.125 ohm max. before life; 0.225 ohm max. after life at 0.5A/28Vdc (measured 1/8" from header)
Resistive: 1 Amp/28Vdc
Contact Load Ratings (DC)
Inductive: 200 mA/28Vdc (320 mH)
(See Fig. 2 for other DC
Lamp: 100 mA/28Vdc
resistive voltage/current ratings)
Low Level: 10 to 50 A/10 to 50mV
Resistive: 250 mA/115Vac, 60 and 400 Hz (Case not grounded)
Contact Load Ratings (AC)
100 mA/115Vac, 60 and 400 Hz (Case grounded)
10,000,000 cycles (typical) at low level
Contact Life Ratings 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 @ 25C
420/422, 420D/422D: 1.5 msec max. at nominal rated coil voltage
Operate Time
420DD/422DD: 2.0 msec max. at nominal rated coil voltage
Contact Bounce 2.0 msec max.
Minimum Operate Pulse 4.5 msec width @ rated voltage
Intercontact Capacitance 0.4 pf typical
Insulation Resistance 10,000 megohms min. between mutually isolated terminals
Dielectric Strength Atmospheric pressure: 500 Vrms/60Hz 70,000 ft.: 125 Vrms/60Hz
Negative Coil Transient (Vdc) 420D/422D, 420DD/422DD 1.0 max
Diode P.I.V. (Vdc) 420D/422D, 420DD/422DD 100 min.
DETAILED ELECTRICAL SPECIFICATIONS (65C to +125C unless otherwise noted) (Note 3)
BASE PART 420/422-5 420/422-6 420/422-9 420/422-12 420/422-18 420/422-26
420D/422D-5 420D/422D-6 420D/422D-9 420D/422D-12 420D/422D-18 420D/422D-26
NUMBERS
420DD/422DD-5 420DD/422DD-6 420DD/422DD-9 420DD/422DD-12 420DD/422DD-18 420DD/422DD-26
(See Note 8 for full P/N example)
Nom. 5.0 6.0 9.0 12.0 18.0 26.5
Coil Voltage (Vdc)
Max. 6.0 8.0 12.0 16.0 24.0 32.0
420/422,
61 120 280 500 1130 2000
Coil Resistance 420D/420D
(Ohms 10% @25C)
420DD/422DD
48 97 280 500 1130 2000
(Note 4)
Min. 75.8 46.9 26.0 20.0 13.7 11.6
Coil Current (mAdc @25C)
(420DD/422DD Series only)
Max. 104.2 63.0 33.7 25.5 17.2 14.4
420/422,
3.5 4.5 6.8 9.0 13.5 18.0
Set & Reset Voltage
420D/422D
(Vdc, Max.)
420DD/422DD 4.5 5.5 7.8 10.0 14.5 19.0
PERFORMANCE CURVES
(NOTE 2)
TYPICAL RF PERFORMANCE TYPICAL DC CONTACT RATING (RESISTIVE)
0
.1
300
.2
250
.3
.4
200
10 1.92
20 1.22
150
30 1.07
100
40 1.02
50 1.01
50
60
1.00
70 1.00
.01 0.5 .1 .5 1.0 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 2 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE 2003 TELEDYNE RELAYS
www.teledynerelays.com 420 422/1203/Q1
RETURN LOSS (VSWR)
ISOLATION ACROSS POLES
ISOLATION ACROSS CONTACTS
dB
VSWR
LOAD VOLTAGE (VDC)