412H/422H/432H Page 1

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE

©2003 TELEDYNE RELAYS

www.teledynerelays.com

412H/422H/432H/1203/Q1

SERIES

412H

422H

432H

HIGH-TEMPERATURE (200°C),

HIGH-PERFORMANCE

TO-5 RELAY

DPDT

DESCRIPTION

The TO-5 relay, originally conceived and developed by Teledyne, has become one of the

industry standards for low-level switching from dry circuit to 1 ampere. Designed for high-

density PC board mounting, these TO-5 relays are some of the most versatile

ultraminiature relays available because of their small size and low coil power dissipation.

The H Series high-temperature TO-5 relays are designed for reliable operation in

elevated ambient temperatures up to 200°C. Special material selection and processing

provide assurance of freedom from contact contamination and mechanical

malfunctioning that might otherwise be caused by ultra high ambient temperature

conditions.

Typical applications:

• Oil exploration (down hole) instrumentation

• High temperature industrial and process control instrumentation

By virtue of its inherently low intercontact capacitance and contact circuit losses, the H

Series relays have proven to be excellent ultraminiature RF switches for applications with

frequency ranges well into the UHF spectrum (see Figures 1 and 2).

PRINCIPLE OF OPERATION 422H

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 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 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

magnetically neutral position.

INTERNAL CONSTRUCTION

SERIES

DESIGNATION

RELAY TYPE

412H

DPDT high-temperature relay

422H

DPDT high-temperature magnetic-latching relay

432H

DPDT sensitive high-temperature relay

UPPER

STATIONARY

CONTACT

LOWER

STATIONARY

CONTACT

MOVING

CONTACT

UNI-FRAME

ARMATURE

SOFT IRON

ARMATURE

SOFT IRON

CORE B

COIL B

MAGNETIC CIRCUIT B

PERMANENT MAGNET

MAGNETIC CIRCUIT A

SOFT IRON FRAME

COIL A

SOFT IRON

CORE A

AIR GAP

STATIONARY

CONTACT

MOVING

CONTACT

412H

ENVIRONMENTAL AND

432H

PHYSICAL SPECIFICATIONS

Temperature

(Ambient)

–65°C to +200°C

Vibration (General Note 1)

30 g’s to 3000 Hz

Shock (General Note 1)

75 g’s,

6 msec, half-sine

Acceleration

50 g’s

Enclosure

Hermetically sealed

Weight

412H

0.09 oz. (2.55g) max.

432H

0.15 oz. (4.25g) max.

422H

ENVIRONMENTAL AND

PHYSICAL SPECIFICATIONS

Temperature

(Ambient)

–65°C to +200°C

Vibration (General Note 1)

30 g’s to 3000 Hz

Shock (General Note 1)

100 g’s,

6 msec, half-sine

Acceleration

50 g’s

Enclosure

Hermetically sealed

Weight

0.10 oz. (2.84g) max.