Axial Lead Reed Switches
High Power > DRT-DTH
DRT-DTH 39.7mm Standard Changeover Reed Switch
RoHS
07/17/2017
N/A
N/A
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
9
insulation resistance of 10 ohms minimum and contact resistance less than
500 milli-ohms.
Features
Minimum voltage breakdown
Changeover switch
1000Vdc
Capable of switching 500Vdc or
Available sensitivity range
1.5A at up to 50W
50-80 AT
Dimensions
Benefits
Dimensions in mm (inch)
Hermetically sealed switch Capable of switching European
1.83 0.25
contacts are not affected by and mains voltage
(.072) NOM. (.010) NOM.
1.27 have no effect on their external Zero operating power required for
CL OF OVERLAP
5.54
(.050) DIA. REF.
27.66
environment contact closure
(.218) MAX.
5.33
(1.89) REF.
(.210) MAX. Can be used as changeover or
normally closed contact
1.02
(.040) DIA. REF.
25.40 12.45
(1.000) NOM. (.490) NOM.
38.10 - 39.67 Applications
(1.500) NOM. - (1.562) MAX.
85.73 - 84.14 Security Industrial safety applications
(3.375) NOM. - (3.3125) MIN.
Limit switching White goods applications
Switch Type
Contact Form C (SPDT-CO)
Body: Glass
Materials
Leads: Tin-plated Ni-Fe wire
Note: SPDT-CO = Single-Pole, Double-Throw, Change Over
Electrical Ratings
1
Contact Rating W/VA - max. 50
2
Switching Vdc - max. 500
3
Voltage Vac - max. 350
4
Breakdown Vdc - min. 1000
2
Switching Adc - max. 1.5
3
Current Aac - max. 1.0
Carry Adc - max. 2.0
6
Contact, Initial - max. 0.500
Resistance
9
Insulation - min. 10
Capacitance Contact pF - typ. 2.0
Operating C -20 to +125
Temperature
5
Storage C -65 to +125
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.
2018 Littelfuse Revised: 01/31/18 littelfuse.com
Specifications are subject to change without notice.Surface Mount Reed Switches
High Power > DRT-DTH
DRT-DTH 39.7mm Standard Changeover Reed Switch
07/17/2017
N/A
N/A
Product Characteristics
Operating Characteristics
1
Operate Time 5.5ms - max.
1
Release Time 8.0ms - max.
2
Shock 11ms 12 sine wave 10G - max.
2
Vibration 50-2000 Hertz 15G - max.
Resonant Frequency Hz - typ. 2.75kHz - typ.
Magnetic Characteristics
3
Pull-In Range Ampere Turns 50-80
4
Rating Sensitivity Ampere Turns 60
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
70
DRT-DTH-50-80
Max.
Min.
60
50
Series
AT Range
40
50-60 AT
Example:
50-80 AT product is
50-65 AT
DRT-DTH-50-80
30 50-80 AT
65-75 AT
70-75 AT
20
70-80 AT
75-80 AT
10
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 Quantity Quantity & Packaging Code Taping Width
Bulk Bulk 1000 N/A N/A
2018 Littelfuse Revised: 01/31/18 littelfuse.com
Specifications are subject to change without notice.
Drop-Out (AT, L4989 Coil)