ER421DM2-18A/R datasheet, PDF - EEWORLD Datasheet

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ER421DM2-18A/R: DescriptionElectromechanical Relay, SPDT, 24VDC (Coil), 0.5A (Contact), 28VDC (Contact), Random, AC/DC Output; CategoryMechanical and electronic products relay; File Size241KB，6 Pages; ManufacturerTeledyne Technologies Incorporated; Websitehttp://www.teledyne.com/; Environmental Compliance

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ER421DM2-18A/R Overview

Electromechanical Relay, SPDT, 24VDC (Coil), 0.5A (Contact), 28VDC (Contact), Random, AC/DC Output

ER421DM2-18A/R Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Reach Compliance Code	compliant
Is Samacsys	N
body height	11.46 mm
Body length or diameter	9.4 mm
Coil resistance	1130 Ω
Maximum coil voltage (DC)	24 V
Nominal coil voltage	18 V
Coil/Input Power Type	DC
Contact (AC) maximum rated R load	0.25A@115VAC
Maximum contact current (AC)	0.25 A
Maximum contact current (DC)	0.5 A
Contact (DC) maximum rated R load	0.5A@28VDC
Contact resistance	175 mΩ
Maximum contact voltage (AC)	115 V
Maximum contact voltage (DC)	28 V
Contact/Output Power Type	AC/DC
Electrical life	100000 Cycle(s)
Input switching control type	Random
Insulation resistance	10000000000 Ω
JESD-609 code	e2
Number of terminals	7
operating hours	1.5 ms
Maximum operating temperature	125 °C
Minimum operating temperature	-65 °C
physical size	9.4mm x 11.46mm
Relay style	1 FORM C
Relay function	SPDT
seal	HERMETICAL
Terminal surface	Tin/Copper (Sn99.3Cu0.7)
Terminal length	0.0033 inch
Termination type	SOLDER
weight	3.23 g
Base Number Matches	1

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SERIES

MAGNETIC-LATCHING

ESTABLISHED RELIABILITY

TO-5 RELAYS

SPDT

SERIES

DESIGNATION

421

421D

421DD

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

RELAY TYPE

421

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

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.

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.

PERMANENT MAGNET

MAGNETIC CIRCUIT A

SOFT IRON CORE A

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

CORE A

CORE B

attractive force in the air gap of Circuit A, which also

AIR GAP

results from the flux of the permanent magnet,

SOFT IRON

ARMATURE

MOVING

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

STATIONARY

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

0.089 oz. (2.52g) max.

421/1205/Q1

421 Page 1

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE

www.teledynerelays.com

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