Datasheet

Axial Lead Reed Switches
High Power > DRT-DTH
DRT-DTH 39.7mm Standard Changeover Reed Switch
RoHS
Description
The DRT-DTH Reed Switch is a standard changeover switch with a 39.67mm long
x 5.33mm diameter (1.562” x 0.210”) glass envelope, with tungsten contacts
capable of high voltage and power switching up to 500Vdc at 50W. It has the
insulation resistance of 10 9 ohms minimum and contact resistance less than
500 milli-ohms.
Features
• Changeover switch
• Capable of switching 500Vdc or
1.5A at up to 50W
Dimensions
Benefits
Dimensions in mm (inch)
1.83
0.25
(.010) NOM.
(.072) NOM.
1.27
5.54 CL OF OVERLAP
(.050) DIA. REF.
(.218) MAX.
25.40
(1.000) NOM.
• Minimum voltage breakdown
1000Vdc
• Available sensitivity range
50-80 AT
27.66
(1.89) REF.
12.45
(.490) NOM.
5.33
(.210) MAX.
1.02
(.040) DIA. REF.
• Hermetically sealed switch
contacts are not affected by and
have no effect on their external
environment
• Can be used as changeover or
normally closed contact
• Capable of switching European
mains voltage
• Zero operating power required for
contact closure
Applications
38.10 - 39.67
(1.500) NOM. - (1.562) MAX.
• Industrial safety applications
• White goods applications
• Security
• Limit switching
85.73 - 84.14
(3.375) NOM. - (3.3125) MIN.
Switch Type
Contact Form
C (SPDT-CO)
Materials
Body: Glass
Leads: Tin-plated Ni-Fe wire
Note: SPDT-CO = Single-Pole, Double-Throw, Change Over
Electrical Ratings
Contact Rating 1
W/VA - max.
50
500
350
1000
1.5
1.0
2.0
Carry
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Resistance
Contact, Initial
Insulation
Ω - max.
Ω - min.
0.500
109
Capacitance
Contact
pF - typ.
2.0
Temperature
Operating
Storage 5
°C
°C
-20 to +125
-65 to +125
Voltage 3
Current 3
Switching
2
Breakdown 4
Switching 2
6
Notes:
1. Contact rating - Product of the switching voltage and current should never exceed the wattage rating. Contact Littelfuse for additional load/life information.
2. When switching inductive and/or capacitive loads, the effects of transient voltages and/or currents should be considered. Refer to Application Notes AN108A and AN107 for details.
3. Electrical Load Life Expectancy - Contact Littelfuse with voltage, current values along with type of load.
4. Breakdown Voltage - per MIL-STD-202, Method 301.
5. Storage Temperature - Long time exposure at elevated temperature may degrade solderability of the leads.
6. Contact resistance measured at 36Vdc, 100mA, switched wet.
7. Not recommended for small electrical loads.
© 2015 Littelfuse
Revised: 11/02/15
Specifications are subject to change without notice.
littelfuse.com
Surface Mount Reed Switches
High Power > DRT-DTH
DRT-DTH 39.7mm Standard Changeover Reed Switch
Product Characteristics
Operating Characteristics
Operate Time
1
5.5ms - max.
Release Time
1
8.0ms - max.
Shock
2
Vibration
11ms 1∕2 sine wave
10G - max.
50-2000 Hertz
15G - max.
Hz - typ.
2.75kHz - typ.
Ampere Turns
50-80
Ampere Turns
60
2
Resonant Frequency
Magnetic Characteristics
Pull-In Range
3
Rating Sensitivity
4
Test Coil
L4988
Notes:
1. Operate (including bounce)/Release Time - per EIA/NARM RS-421-A,diode suppressed coil (Coil II).
2. Shock and Vibration - per EIA/NARM RS-421-A and MIL-STD-202.
3. Pull-In Range - Contact Littelfuse for narrower AT ranges available.
4. Rating Sensitivity - The value at which contact ratings and operating characteristics are determined. Derating may be required below this value.
5. Custom modifications of forming and/or cutting of reed switches are available. Please contact Littelfuse.
Drop-Out vs. Pull-In Chart
Part Numbering System
DRT-DTH-50-80
70
Max.
Min.
60
Series
Drop-Out (AT, L4989 Coil)
50
AT Range
50-60 AT
50-65 AT
50-80 AT
65-75 AT
70-75 AT
70-80 AT
75-80 AT
40
30
20
10
Example:
50-80 AT product is
DRT-DTH-50-80
Note: These AT values are the before-modification values of the bare reed switch.
0
0
10
20
30
40
50
60
70
80
90
Pull-In (AT, L4989 Coil)
Note: Chart represents the range of Drop-Out, min to max for a given Pull-In value.
Packaging
Packaging Option
Packaging Specification
Bulk
© 2015 Littelfuse
Revised: 11/02/15
Specifications are subject to change without notice.
Bulk
Quantity
1000
Quantity & Packaging Code
N/A
Taping Width
N/A
littelfuse.com