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HomeProductsSwitchesMagnetic, Reed SwitchesDRS-DTH-70-80
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DRS-DTH-70-80 - Littelfuse Inc.

Manufacturer Part Number
DRS-DTH-70-80
Manufacturer
Littelfuse
Allelco Part Number
98D-DRS-DTH-70-80
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
36,341 pcs available, New & Original
Parts Description
SWITCH REED SPDT
Package
Bulk
Data sheet
DRS-DTH-70-80.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 36341
  • Unit Price: $2.947
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $2.947 $2.95
200+ $1.176 $235.20
500+ $1.137 $568.50
1000+ $1.118 $1,118.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

DRS-DTH-70-80 Tech Specifications
Littelfuse Inc. - DRS-DTH-70-80 technical specifications, attributes, parameters and parts with similar specifications to Littelfuse Inc. - DRS-DTH-70-80

Product Attribute Attribute Value
Manufacturer Littelfuse
Voltage - Switching DC 500 V
Voltage - Switching AC 350 V
Type Glass Body Reed
Termination Style Axial
Size - Body 0.210" Dia x 1.500" L (5.33mm x 38.10mm)
Series DRS-DTH
Release Time 7 ms
Release Range -
Power - Rated 30W
Package Bulk
Product Attribute Attribute Value
Operating Temperature -20°C ~ 125°C
Operate Time 4.5 ms
Operate Range 70 ~ 80AT
Mounting Type Through Hole
Length - Overall 3.375" (85.73mm)
Height Above Board -
Current - Switching 350mA (AC), 500mA (DC)
Current - Carry 3A (DC)
Circuit SPDT
Capacitance 2 pF

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) Not Applicable
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8536.50.9065

Frequently Asked Questions(FAQ)

What is the difference between the DRS-DTH-70-80 operating range and release range specifications?
The DRS-DTH-70-80 specifies an operate range of 70–80 AT (ampere-turns), which defines the magnetic field strength required to close the reed contacts. This is the primary design parameter for determining activation distance when using an external magnet. The DRS-DTH-70-80 does not list a separate release range specification, which means the switch typically releases when the magnetic field drops below the operate threshold without hysteresis-induced latching. In practical applications, this characteristic allows the DRS-DTH-70-80 to respond predictably in proximity-sensing circuits where magnet withdrawal is expected to deactivate the switch reliably.
Can the DRS-DTH-70-80 be used interchangeably with the DRR-DTH-70-80 in existing designs?
The DRR-DTH-70-80 is listed as a direct substitute for the DRS-DTH-70-80, indicating electrical and mechanical compatibility at the circuit level. However, physical verification is recommended before committing to production because substitute components may differ in physical dimensions, lead configuration, or manufacturing tolerances that could affect board layout or assembly processes. Both devices share the same SPDT circuit topology, 70–80 AT operate range, and 350mA AC / 500mA DC switching current ratings, but confirmation of the exact DRS-DTH-70-80 footprint and terminal geometry against the substitute datasheet is prudent to avoid assembly complications.
Why does the DRS-DTH-70-80 have different current ratings for AC versus DC switching?
The DRS-DTH-70-80 supports 350mA AC and 500mA DC because AC and DC switching behavior differs in reed switch contact physics. With AC current, the alternating polarity creates rapid contact stress and potential micro-arcing at the 50–60 Hz line frequency, which limits safe switching current to 350mA. DC switching is less prone to these rapid transients; the DRS-DTH-70-80 can safely handle 500mA DC before contact erosion or welding becomes probable. The 30W power rating applies as the limiting factor in both cases—at 350V switching voltage, 350mA AC corresponds to approximately 122.5W peak (though actual load power would be lower), while 500mA DC at lower voltages stays within the 30W envelope. Design engineers should verify actual load power against the DRS-DTH-70-80 power rating rather than assuming the current limit is always safe.
How should the DRS-DTH-70-80 be protected when switching inductive loads?
The DRS-DTH-70-80 is a reed switch with inherent contact limitations when de-energizing inductive loads (relays, solenoids, motors). Inductive kickback creates voltage spikes that exceed the 350V AC / 500V DC switching voltage rating and can cause contact arcing or premature wear. When the DRS-DTH-70-80 controls inductive circuits, a parallel diode (for DC loads) or an RC snubber network (for AC loads) should be placed across the inductor to suppress transients. For DC inductive loads, a 1N4007 diode rated for the load current provides cost-effective protection. For AC inductive loads, an RC network (typically 100Ω resistor in series with 0.1µF capacitor) connected across the load dampens voltage overshoot before it reaches the DRS-DTH-70-80 contacts. Without protection, the DRS-DTH-70-80 may exhibit contact sticking or reduced electrical life despite meeting the 30W continuous power rating.
What is the practical maximum switching frequency for the DRS-DTH-70-80 given its 4.5 ms operate time and 7 ms release time?
The DRS-DTH-70-80 has a total switching cycle time of approximately 11.5 ms (4.5 ms operate + 7 ms release), which theoretically limits continuous switching to roughly 87 cycles per second. However, practical maximum frequency depends on the control magnet's motion profile and the application's thermal dissipation. At room temperature within the -20°C ~ 125°C operating range, the DRS-DTH-70-80 can handle moderate repetitive switching (10–20 Hz) without thermal stress. Higher frequencies require careful power calculation: at 30Hz switching 30W loads, average power approaches or exceeds the 30W rating, causing contact heating. Intermittent high-frequency duty cycles (impulse counting, short-pulse applications) are acceptable if the DRS-DTH-70-80 thermal time constant (typically several seconds for a glass reed switch) allows heat dissipation between pulses. For sustained switching above 50 Hz, alternative electromagnet-actuated contacts or solid-state switches should be considered.
How does temperature affect the DRS-DTH-70-80 magnetic sensitivity and switching reliability?
The DRS-DTH-70-80 operates across -20°C ~ 125°C, but reed contact resistance and magnetic sensitivity shift across this range. At elevated temperatures (above 100°C), contact resistance typically increases 10–15% due to thermal effects on the metal film coating inside the glass tube, potentially raising voltage drop during switching. Magnetic permeability of the reed blades also decreases slightly with temperature; at 125°C, the DRS-DTH-70-80 may require slightly stronger magnetic fields or closer magnet proximity than at room temperature to reliably achieve the 70–80 AT operate threshold. Conversely, at -20°C, contact stiffness increases and operate time may extend to the upper end of the 4.5 ms specification. For precision applications requiring consistent trip points across temperature extremes, the DRS-DTH-70-80 design should include temperature-compensated magnet spacing or selective use of Curie-temperature-stable permanent magnets to maintain consistent actuation over the full operating range.
What is the significance of the 2 pF capacitance specification for the DRS-DTH-70-80 in high-frequency signal applications?
The DRS-DTH-70-80 lists a parasitic capacitance of 2 pF between its reed contacts when the switch is open. While 2 pF is extremely small for power-switching applications, it becomes relevant in high-frequency or precision analog circuits. If the DRS-DTH-70-80 is used to switch signal-level circuits (RF, instrumentation, precision sensors) operating above 100 MHz, the 2 pF capacitance may introduce insertion loss or slight signal attenuation when the switch is in the open state. In sensitive impedance-matched systems (50Ω coaxial feeds, for example), the DRS-DTH-70-80 contact capacitance can slightly detune coupling networks. For typical power-switching and low-frequency control applications, the 2 pF parasitic is negligible, but RF-grade reed switches with lower capacitance (sub-1 pF) should be specified if the DRS-DTH-70-80 is used in tuned or phase-critical circuits.
How does the 3 A DC carry current rating relate to the 500 mA DC switching rating of the DRS-DTH-70-80?
The DRS-DTH-70-80 distinguishes between switching current (maximum safe current during contact closure/opening transitions) and carry current (continuous DC current the closed contacts can sustain). The 500 mA DC switching limit protects the DRS-DTH-70-80 contacts during the brief moment when the magnetic field pulls the reed blades together; exceeding this threshold risks contact welding or micro-arcing. Once the DRS-DTH-70-80 contacts are fully closed and stable, the 3 A DC carry rating applies—the closed contacts can safely conduct 3 A continuously without erosion. This distinction is critical in designs where high steady-state current flows through a load after the DRS-DTH-70-80 initiates the connection. For example, a 2 A DC motor load exceeds the 500 mA switching current limit but falls within the 3 A carry rating; such a design would fail during initial contact engagement but function correctly if current ramps gradually after closure. Current-limiting resistors or soft-start circuits may be necessary to keep in-rush current below 500 mA during DRS-DTH-70-80 activation.
Why is the DRS-DTH-70-80 RoHS3 compliant but the moisture sensitivity level marked as not applicable?
The DRS-DTH-70-80 achieves RoHS3 compliance (lead-free solder, restricted hazardous substances) through its through-hole glass body and sealed reed switch design. The moisture sensitivity level (MSL) is marked not applicable because the DRS-DTH-70-80's hermetically sealed glass tube prevents moisture ingress during typical storage, handling, and board assembly. Unlike plastic-packaged semiconductor components that absorb moisture and risk delamination during reflow soldering, the DRS-DTH-70-80 glass enclosure provides inherent moisture protection regardless of ambient humidity or storage conditions. This characteristic simplifies supply chain management—the DRS-DTH-70-80 does not require desiccant packaging, bake-out procedures, or strict humidity-controlled assembly environments. However, the axial through-hole leads and solder joints themselves are subject to standard PCB-level moisture concerns; the not-applicable rating refers only to the component package itself.
Can the DRS-DTH-70-80 be used to replace a mechanical push-button switch in a cost-sensitive application?
The DRS-DTH-70-80 and mechanical push-button switches serve different operational roles and are not direct replacements. A push-button requires intentional physical contact from a user or actuator, providing positive tactile feedback and immediate response. The DRS-DTH-70-80, by contrast, is a proximity-actuated reed switch activated by external magnetic fields—it operates contactlessly when a magnet approaches within the 70–80 AT sensitivity window. The DRS-DTH-70-80 is less suitable for user-interface applications (buttons, keypads) but offers advantages in sealed or hazardous environments where mechanical actuation is impractical or where the switch must operate without direct physical access. If cost is the primary concern, mechanical push-buttons typically cost less per unit at high volumes; the DRS-DTH-70-80 justifies selection when sealed operation, remote actuation, or robustness in harsh conditions adds value beyond the component price.
What precautions should be taken when soldering the DRS-DTH-70-80 axial leads to avoid damaging the reed switch?
The DRS-DTH-70-80 glass body reed switch is sensitive to thermal shock during wave or hand soldering. Excessive heat near the glass tube can cause thermal stress, and rapid cooling may induce micro-cracks inside the sealed package that compromise the vacuum or gas fill and degrade switch performance. Best practices for soldering the DRS-DTH-70-80 include: (1) use a solder temperature not exceeding 260°C, kept below the glass transition temperature to avoid permanent deformation; (2) limit dwell time to <3 seconds per lead to minimize heat conduction along the axial wires into the glass body; (3) allow gradual cooling after soldering rather than forced air cooling, which increases thermal shock risk; (4) apply thermal standoff or solder bridges on the PCB if high-temperature rework is anticipated. Wave-soldering the DRS-DTH-70-80 requires careful conveyor speed tuning—too slow introduces excessive heating, while very fast passes may leave cold solder joints on the axial leads. Manual inspection of the DRS-DTH-70-80 solder joints is recommended to verify wetting and mechanical strength before the board enters test or deployment.
How should the DRS-DTH-70-80 be specified in a design where both AC and DC loads are controlled from the same circuit?
The DRS-DTH-70-80 supports both AC and DC switching, but the asymmetric current and voltage ratings (350mA/350V AC vs. 500mA/500V DC) must be reconciled when a single switch controls mixed loads. The practical approach is to derate the DRS-DTH-70-80 to the more restrictive AC specification when AC loads are present: 350mA maximum and 350V maximum. This ensures the DRS-DTH-70-80 remains within its AC contact-switching envelope even if a DC load is applied later or if control logic inadvertently energizes an AC branch. Alternatively, if the circuit topology permits, separate the AC and DC loads such that the DRS-DTH-70-80 carries only one type at a time; if AC load current is <350mA and DC load current is <500mA, both can safely use the same switch. Power dissipation in the DRS-DTH-70-80 contact resistance should also be verified—at 350mA through typical reed contact resistance (0.2–0.3Ω), power loss is roughly 25–35 mW per contact pair, which accumulates if the DRS-DTH-70-80 is continuously energized. Heat management becomes important in confined PCB areas or high-ambient-temperature applications where the operating range approaches 125°C.
What is the expected electrical lifetime of the DRS-DTH-70-80 under normal switching conditions?
Littelfuse datasheets for reed switches like the DRS-DTH-70-80 typically specify mechanical life (contact closure/opening cycles) in the range of 10–50 million cycles under rated conditions, but electrical life—the number of cycles before contact resistance degradation or failure becomes probable—is often shorter. Electrical life of the DRS-DTH-70-80 depends on contact erosion, which accelerates with higher current (approaching the 350mA/500mA limits), higher switching frequency, and presence of inductive loads without protection. Under conservative conditions (50% of rated current, low-frequency switching <10 Hz, resistive loads), the DRS-DTH-70-80 may achieve 5–10 million cycles. Under aggressive conditions (350mA+ AC switching, high-frequency cycling, inductive loads without snubbers), electrical life may degrade to <100,000 cycles. For applications requiring long-term reliability prediction, accelerated life testing of the DRS-DTH-70-80 under actual load conditions is recommended rather than relying on generic lifetime estimates. Periodic contact resistance measurement during field operation can alert designers to imminent failure before catastrophic loss of function.

Parts with Similar Specifications

The three parts on the right have similar specifications to Littelfuse Inc. DRS-DTH-70-80

Product Attribute DRS-DTH-75-80 DRS-DTH-50-80 DRS-DTH-70-85 DRS-DTH-60-80
Part Number DRS-DTH-75-80 DRS-DTH-50-80 DRS-DTH-70-85 DRS-DTH-60-80
Manufacturer Littelfuse Inc. Littelfuse Inc. Littelfuse Inc. Littelfuse Inc.
Capacitance - - - -
Type - - - -
Circuit - - - -
Size - Body - - - -
Operate Time - - - -
Termination Style - - - -
Release Time - - - -
Length - Overall - - - -
Height Above Board - - - -
Current - Carry - - - -
Voltage - Switching DC - - - -
Current - Switching - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Series - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Voltage - Switching AC - - - -
Release Range - - - -
Operate Range - - - -
Power - Rated - - - -

DRS-DTH-70-80 Datasheet PDF

Download DRS-DTH-70-80 pdf datasheets and Littelfuse Inc. documentation for DRS-DTH-70-80 - Littelfuse Inc..

Datasheets
DRS-DTH Series Datasheet.pdf

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Littelfuse Inc.

DRS-DTH-70-80

Littelfuse Inc.
98D-DRS-DTH-70-80

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