Datasheet > 421DD-9

421DD-9

更新时间： 2024-11-29 00:58:39

品牌	Logo	应用领域
TELEDYNE		/
页数	文件大小	规格书
6页	246K
描述
MAGNETIC-LATCHING ESTABLISHED RELIABILITY TO-5 RELAYS

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421DD-9 数据手册

SERIES

421

MAGNETIC-LATCHING

ESTABLISHED RELIABILITY

TO-5 RELAYS

SPDT

SERIES

DESIGNATION

RELAY TYPE

421

SPDT basic relay

421D

SPDT relay with internal diode for coil transient suppression

SPDT relay with internal diodes for coil transient suppression and polarity

reversal protection

421DD

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

suppression and polarity reversal protection.

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.

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 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.

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.

• Precious metal alloy contacts material with gold plating assures

excellent high current and dry circuit switching capabilities.

PERMANENT MAGNET

MAGNETIC CIRCUIT A

SOFT IRON CORE A

MAGNETIC CIRCUIT B

PRINCIPLE OF OPERATION

Energizing Coil B produces a magnetic field

COIL B

COIL A

opposing the holding flux of the permanent magnet

in Circuit B. As this net holding force decreases, the ^{SOFT IRON}

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

ENVIRONMENTAL AND

PHYSICAL SPECIFICATIONS

SOFT IRON

CORE A

CORE B

AIR GAP

SOFT IRON

ARMATURE

Temperature

MOVING

CONTACT

–65°C to +125°C

(Ambient)

Vibration

30 g’s to 3000 Hz

STATIONARY

CONTACT

(General Note 1)

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.

Shock

(General Note 1)

100 g’s,

6 msec, half-sine

Acceleration

Enclosure

Weight

50 g’s

Hermetically sealed

0.089 oz. (2.52g) max.

421 Page 1

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE

www.teledynerelays.com

421/1205/Q1

12 3 4 5 6

中文翻译

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与421DD-9相关器件

型号	品牌	获取价格	描述	数据表
421-FREQ-DE0	FOX	获取价格	HCMOS Output Clock Oscillator, 1MHz Min, 80MHz Max, ROHS COMPLIANT, SMD, 6 PIN
421G-05LF	IDT	获取价格	PLL Based Clock Driver, 421 Series, 3 True Output(s), 0 Inverted Output(s), PDSO8, 0.173 I
421G-05LFT	IDT	获取价格	PLL Based Clock Driver, 421 Series, 3 True Output(s), 0 Inverted Output(s), PDSO8, 0.173 I
421QS16E	HITTITE	获取价格	PCS/UMTS HIGH IP3 RFIC DOWNCONVERTER, 1.4 - 2.3 GHz
421S1	TDK	获取价格	Pulse Transformer, GENERAL PURPOSE Application(s), 4:2:1
421S2	TDK	获取价格	Pulse Transformer, GENERAL PURPOSE Application(s), 4:2:1
421S3	TDK	获取价格	Pulse Transformer, GENERAL PURPOSE Application(s), 4:2:1
421S4	TDK	获取价格	Pulse Transformer, GENERAL PURPOSE Application(s), 4:2:1
421T1	TDK	获取价格	Pulse Transformer, GENERAL PURPOSE Application(s), 4:2:1
421T4	TDK	获取价格	Pulse Transformer, GENERAL PURPOSE Application(s), 4:2:1

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