ER421-12A TELEDYNE, ER421-12A Datasheet

ER421-12A

Manufacturer Part Number

ER421-12A

Description

Electromechanical Relay SPDT 1ADC/0.25AAC 12VDC 500Ohm Through Hole

Manufacturer

TELEDYNE

Type

Magnetic Latching Established Reliability Relayr

Datasheet

1.ER421-12A.pdf (6 pages)

Specifications of ER421-12A

Contact Arrangement

SPDT

Dc Coil Voltage

12 V

Coil Current

24 mA

Mounting

Through Hole

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421 Page 1

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 0.5 ampere. Designed for

high-density PC board mounting, its small size and low coil power

dissipation make the 421 relay one 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

• High force/mass ratios for resistance to shock and vibration.

• Advanced cleaning techniques provide maximum assurance of

• Precious metal alloy contacts material with gold plating assures

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 magnetic neutral position.

mechanical rigidity.

internal cleanliness.

excellent high current and dry circuit switching capabilities.

DESIGNATION

SERIES

421DD

421D

421

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE

ESTABLISHED RELIABILITY

SPDT basic relay

SPDT relay with internal diode for coil transient suppression

SPDT relay with internal diodes for coil transient suppression and polarity

reversal protection

MAGNETIC-LATCHING

SOFT IRON

ARMATURE

SOFT IRON

MAGNETIC CIRCUIT B

CORE B

COIL B

PERMANENT MAGNET

TO-5 RELAYS

www.teledynerelays.com

SPDT

The Series 421D and 421DD utilize discrete silicon diodes for coil

suppression and polarity reversal protection.

By virtue of its inherently low intercontact capacitance and contact

circuit losses, the 421 relay has proven to be an excellent

ultraminiature RF switch for frequency ranges well into the UHF

spectrum. A typical RF application for this 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 transmit-receive switching

(see Figure 1).

The Series 421 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. After the contacts

have transferred, no external holding power is required.

The magnetic latching feature of the Series 421 provides a “memory”

capability, since the relays will not reset upon removal of coil power.

RELAY TYPE

MAGNETIC CIRCUIT A

SOFT IRON CORE A

COIL A

SOFT IRON

CORE A

AIR GAP

STATIONARY

CONTACT

MOVING

Temperature

(Ambient)

Vibration

(General Note 1)

Shock

(General Note 1)

Acceleration

Enclosure

Weight

PHYSICAL SPECIFICATIONS

ENVIRONMENTAL AND

SERIES

–65°C to +125°C

30 g’s to 3000 Hz

100 g’s,

6 msec, half-sine

50 g’s

Hermetically sealed

0.089 oz. (2.52g) max.

421

421/1205/Q1

Related parts for ER421-12A

ER421-12A Summary of contents

Page 1

... 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 0.5 ampere. Designed for high-density PC board mounting, its small size and low coil power dissipation make the 421 relay one of the most versatile ultraminiature relays available ...

Page 2

... FREQUENCY (GHz) FIGURE 1 ©2005 TELEDYNE RELAYS SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE 0.5 Amp/28Vdc 200 mA/28Vdc (320 mH) 100 mA/28Vdc µA/10 to 50mV 250 mA/115Vac, 60 and 400 Hz (Case not grounded) 100 mA/115Vac, 60 and 400 Hz (Case grounded) 100,000 cycles min. at all other loads specified above ...

Page 3

... DIA. 6 DIMENSIONS ARE SHOWN IN INCHES (MILLIMETERS) Teledyne Part Numbering System for T ER 421 Teledyne Part Numbering System for Military Qualified (JAN) Relays J 421 JAN part number example is for reference only. Actual part number may not exist. www.teledynerelays.com ...

Page 4

... For use with the following: ER411T ER412, ER412D, ER412DD 712, 712D, 712TN, RF300, RF310, RF320 H Dim ER420, ER422D, ER420DD, 421, MAX ER421D, ER421DD, ER422, ER422D, ER422DD, 722, 722D, RF341 ER431T, ER432T, ER432, ER432D, ER432DD 732, 732D, 732TN, RF303, RF313, RF323 RF312 ER411, ER411D, ER411DD H ...

Page 5

... ER412T, J412T 712, 712D, 712TN ER431T, J431T, ER432, ER432D ER432DD, J432, J432D, J432DD ER432T, J432T 732, 732D, 732TN ER420, J420, ER420D, J420D ER420DD, J420DD, ER421, J421 ER421D, J421D, ER421DD J422D, ER422DD, J422DD, 722 ER411T ER412, ER412D, ER412DD J412, J412D, J412DD 712, 712D ...

Page 6

... Appendix A: Ground Pin Positions Ø.200 [Ø5.08] 36° ±3° TO-5 Relays: ER411T, ER412, ER412T, ER420, ER421, ER422, ER431T, ER432, ER432T, 712, 712TN, 400H, 400K, 400V, RF300, RF303, RF341, RF312, RF310, RF313, RF320, RF323 .100 [2.54] .100 [2.54] .050 [1.27] .100 [2.54] Centigrid® ...

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