W171DIP-5 Magnecraft / Schneider Electric, W171DIP-5 Datasheet - Page 6

• Manufacturer Part Number: W171DIP-5
• Description: Reed Relay SPST-N.O. 24V
• Manufacturer: Magnecraft / Schneider Electric
• Type: Reed Relays / DIPr

Specifications of W171DIP-5

• Contact Form: SPST - NO
• Maximum Switched Current: 0.5 A
• Coil Resistance: 2200 Ohms
• Contact Rating: 0.288 W
• Current, Rating: 0.5 A
• Dielectric Strength: 500 V (RMS) (Coil to Contacts), 150 V (RMS) (Across Open Contacts)
• Function: Power
• Material, Contact: Rhodium
• Mounting Type: PCB
• Number Of Pins: 8
• Relay Type: Reed
• Resistance, Coil: 2200 Ohms (Nom.)
• Standards: RoHS
• Temperature, Operating: -40 to +85 °C
• Termination: Solder
• Voltage, Control: 24 VDC
• Voltage, Rating: 100 VDC
• Weight: 1 g
• Coil Voltage Vdc Nom: 24V
• Switching Current Max: 500mA
• Switching Voltage Max: 100VDC
• Contact Configuration: SPST-NO
• Relay Mounting: PCB
• External Height: 7.62mm
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 171DIP-5

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MAGNETIC FIELDS
Reed relays in general can be characterized as
susceptible to the influences of external magnetic fields.
It is important to keep reed relays at a proper distance
from each other because of the possibility of magnetic-
interaction between them. Proper magnetic shielding
must be used to contain stray magnetic fields. When
installing reed relays into equipment, one should be
aware of the devices within that equipment which
can produce magnetic fields. The relays being installed
into that equipment should be positioned as far away
as possible from any stray magnetic fields and should
be shielded to prevent false operations.
ELECTRICAL CHARACTERISTICS
SENSITIVITY:
The input power required to operate dry reed relays is
determined by the sensitivity of the particular reed
switch used, by the number of switches operated by
the coil, by the permanent magnet biasing (if used),
and the efficiency of the coil and the effectiveness of
its coupling to the blades. Minimum input required to
effect closure ranges from the very low milliwatt level
for a single sensitive capsule to several watts for
multipole relays.
OPERATE TIME:
The coil time constant, overdrive on the coil, and the
characteristics of the reed switch determine operate
time. With the maximum overdrive voltage applied to
the coil, reed relays will operate in approximately the
200 microsecond range. When driven at rated coil
voltage, usually the relays will operate at about one
millisecond.
RELEASE TIME:
With the coil unsuppressed, dry reed switch contacts
release in a fraction of a millisecond. SPST-NO contacts
will open in as little as 50 microseconds. Magnetically
biased SPST-NC and SPDT switches reclose from 100
microseconds to 1 millisecond respectively.
If the relay coil is suppressed, release times are
increased. Diode suppression can delay release times
for several milliseconds, depending on coil
characteristics, coil voltage, and reed release
characteristics.
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APPLICA
APPLICA
TION DA
TION DA
T
T
A
A
CONTACT BOUNCE
Dry reed contacts bounce on closure as with any other
hard contact relay.The duration of bounce on a Dry reed
switch is typically very short, and is in part dependent
on drive level. In some of the faster devices, the sum of
the operate time and bounce is relatively constant. As
drive is increased, the operate time decreases with
bounce time increasing.The normally closed contacts of
a SPDT switch bounce more then the normally open
contacts. Magnetically biased SPST-NC contacts exhibit
essentially the same bounce characteristics as SPST-NO
switches.
CONTACT RESISTANCE
The reeds (blades) in a dry reed switch are made of
magnetic material which has a high volume resistivity,
terminal-to-terminal resistance is somewhat higher than
in some other types of relays. Typical specification limits
for initial resistance of a SPST-NO reed relay is 0.200
ohms max (200 milliohms).
INSULATION RESISTANCE
A dry reed switch made in a properly controlled internal
atmosphere will have an insulation resistance of 10
to
relay, parallel insulation paths reduce this to typical values
of
relay construction, exposure to high humidity or
contaminating environments can appreciably lower final
insulation resistance.
CAPACITANCE
Reed capsules typically have low terminal-to-terminal
capacitance. However, in the typicall relay structure
where the switch is surrounded by a coil, capacitance
from each reed to the coil act to increase capacitance
many times. If the increased capacitance is objectionable,
it can be reduced by placing a grounded electrostatic
shield between the switch and coil.
DIELECTRIC WITHSTAND VOLTAGE
With the exception of the High-Voltage dry reed switches
( capsules that are pressurized or evacuated), the dielectric
strength limitation of relays is determined by the ampere
turn sensitivity of the switches used. A typical limit is
200 VAC. The dielectric withstand voltage between switch
and coil terminals is typically 500 VAC.
10
10
ohms. Depending on the particular manner of
ohms or greater. When it is assembled into a
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9
REED RELAYS
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