122C Willow Technologies Ltd, 122C Datasheet

122C

Manufacturer Part Number

122C

Description

Centrigrid Magnetic Latching Aerospace Relay

Manufacturer

Willow Technologies Ltd

Datasheet

1.122C.pdf (3 pages)

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DESCRIPTION

The 122C Centigrid magnetic-latching relay is an ultraminiature,

hermetically sealed, armature relay capable of being directly driven by

most IC logic families. Its low profile height and .100” grid spaced

terminals, which precludes the need for spreader pads, make it ideal

for applications where extreme packaging density and/or close PC

board spacing are required.

The basic concept and internal structure are similar to the Teledyne

TO-5 422 relay series. The 122C is capable of meeting Teledyne Relays’

manufacturing techniques provide overall high reliability and excellent

resistance to environmental extremes:

• All welded construction.

• Unique uni-frame design providing high magnetic efficiency and

• High force/mass ratios to withstand shock and vibration.

• Advanced cleaning techniques provide maximum assurance of

• Precious metal alloy contact 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 energy from Coil B, but will snap back to 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 the maximum set/reset 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 magnetically

neutral position.

mechanical rigidity.

internal cleanliness.

excellent high current and dry circuit switching capabilities.

requirements. The following unique construction features and

DESIGNATION

SERIES

122C

DPDT general purpose magnetic latching relay with internal power MOSFET driver and

diode coil transient suppression

TELEDYNE RELAYS

MAGNETIC CIRCUIT B

MAGNETIC LATCHING

COIL B

AEROSPACE RELAY

PERMANENT MAGNET

CMOS COMPATIBLE

CENTRIGRID

SOFT IRON

ARMATURE

DPDT

The 122C Series utilizes internal silicon diodes for coil suppression,

Zener diodes to protect the MOSFET gate inputs, and N-channel

enhancement-mode MOSFET chips, which enable direct relay inter-

facing with most microprocessor and IC logic families (CMOS, TTL

and MOS).

The 122C magnetic-latching relay is ideally suited for applications

where power-dissipation must be minimized. The relays can be operated

with a short-duration pulse: after contacts have transferred, no external

holding power is required.

The magnetic-latching feature of the 122C Series provide a “memory”

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

By virtue of its inherently low intercontact capacitance and contact

circuit losses, the Centigrid relay has shown itself to be an excellent

ultraminiature RF switch for frequency ranges well into the UHF

spectrum. A typical RF application for the Centigrid

held 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).

MAGNETIC CIRCUIT A

SOFT IRON CORE A

SOFT IRON FRAME

COIL A

CONTACT

AIR GAP

MOVING

RELAY TYPE

STATIONARY

CONTACT

Temperature

Vibration

Shock

Acceleration

Enclosure

Weight

(Ambient)

PHYSICAL SPECIFICATIONS

ENVIRONMENTAL AND

-65˚C to +125˚C

30 g’s to 3000 Hz (Note 2)

100 g’s for 6 msec. (Note 2)

half-sine

50 g’s (Note 2)

All welded, hermetically sealed

0.10 oz (2.75 gms.) max.

SERIES

122C

relay is in hand

Related parts for 122C

122C Summary of contents

Page 1

... PC board spacing are required. The basic concept and internal structure are similar to the Teledyne TO-5 422 relay series. The 122C is capable of meeting Teledyne Relays’ 2 requirements. The following unique construction features and T R ® ...

Page 2

... BASE PART NUMBERS 122C-5 122C-6 (Note 3) 5.0 6.0 5.6 8.0 114.9 57.0 82.2 41.6 505 296 3.5 4.5 300 250 200 1.92 1.22 150 1.07 100 1.02 1.01 50 1.00 1.00 .5 1.0 0 0.1 63 SERIES 122C 70,000 ft.: 125 VRMS/60Hz 122C-9 122C-12 122C-18 122C-26 9.0 12.0 18.0 26.5 12.0 16.0 24.0 32.0 37.2 27.8 18.2 15.2 27.4 20.5 13.7 11.4 288 287 286 351 6.8 9.0 13.5 18.0 TYPICAL DC CONTACT RATING (RESISTIVE) 0.2 0.3 0.4 0.5 0.6 ...

Page 3

... SPACER PAD Relays can be supplied with a spacer pad attached to the relay header. The pad permits the relay to be spaced away from the mounting surface facilitating solder joint inspection. To order add M9 to the part number. Example: 122CM9-26. NOTES: 1. Material: Polyester film. 2. Add 0.01 ohm to contact resistance with mounting pad. ...

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