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HomeProductsSensors, TransducersTemperature Sensors - Thermostats - Mechanical67L120-0378
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67L120-0378 - Sensata-Airpax

Manufacturer Part Number
67L120-0378
Manufacturer
Airpax / Sensata Technologies
Allelco Part Number
32D-67L120-0378
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,438 pcs available, New & Original
Parts Description
THERMOSTAT 120DEG C NC TO220-2
Package
TO-220-2
Data sheet
67L120-0378.pdf
RoHs Status
RoHS Compliant
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Our certification
In stock: 5438
  • Unit Price: $14.09
  • Subtotal: $0.00

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Add to Cart and Submit RFQ now, we'll contact you immediately.

Quantity Unit Price Ext. Price
1+ $14.09 $14.09
200+ $5.62 $1,124.00
500+ $5.43 $2,715.00
1000+ $5.34 $5,340.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

67L120-0378 Tech Specifications
Sensata-Airpax - 67L120-0378 technical specifications, attributes, parameters and parts with similar specifications to Sensata-Airpax - 67L120-0378

Product Attribute Attribute Value
Manufacturer Airpax / Sensata Technologies
Tolerance ±9°F (±5°C)
Termination Style PC Pins
Switching Temperature 248°F (120°C)
Switching Cycles 20K
Series 6700
Reset Temperature 185°F (85°C)
Product Attribute Attribute Value
Package / Case TO-220-2
Package Tube
Mounting Type Through Hole
Current Rating - DC 0.5A (48V)
Current Rating - AC -
Circuit SPST-NC
Base Product Number 67L120

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status RoHS Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
ECCN EAR99
HTSUS 8536.50.9065

Frequently Asked Questions(FAQ)

How does the 67L120-0378 thermostat's hysteresis behavior compare to typical industrial control requirements, and what design considerations should be made when integrating it into a thermal cutoff circuit?
The 67L120-0378 exhibits a hysteresis band of approximately 63°F (35°C), calculated from its switching temperature of 248°F (120°C) down to the reset point at 185°F (85°C). This substantial hysteresis reduces the risk of rapid cycling in systems with thermal lag, such as motor windings or power supply modules. However, compared to precision thermal switches like those used in medical devices, this hysteresis may be excessive for applications requiring tight thermal regulation. Engineers should evaluate whether the 63°F window aligns with their system’s thermal time constants and safety margins, particularly in environments where ambient temperature fluctuations could cause unintended cycling.
What are the implications of the 67L120-0378’s ±9°F tolerance on system-level reliability, and how might this affect certification or safety-critical designs?
With a tolerance of ±5°C around the 120°C setpoint, the actual switching threshold can vary between 115°C and 125°C. In safety-critical applications—such as battery protection or overheating prevention in consumer electronics—this variation introduces uncertainty in failure thresholds. Designers must derate the thermostat’s use or implement redundant sensing strategies if precise tripping points are mandated by standards like UL or IEC. For non-certified industrial equipment, this margin may be acceptable given cost and size constraints, but documentation of worst-case performance is recommended.
How does the current rating of the 67L120-0378 influence its suitability for different load types, and what derating practices should be applied when using it in high-vibration environments?
The 67L120-0378 is rated for 0.5A at 48V DC under standard conditions. While sufficient for resistive loads such as heaters or indicator lights, inductive loads like relays or motors may require contact protection to prevent arcing and extend service life. In vibration-prone environments, contact degradation accelerates due to micro-arcing and mechanical stress. It is advisable to apply a derating factor of 20–30% on both current and voltage to ensure reliable operation, especially when combined with the device’s limited switching cycle count of 20,000 operations.
When selecting between the 67L120-0378 and alternative temperature switches with similar setpoints, what trade-offs exist regarding package type, termination style, and PCB integration?
Unlike surface-mount alternatives such as TO-263 variants, the 67L120-0378 uses a TO-220-2 package with PC pins for through-hole mounting, which offers robust mechanical attachment and easier manual assembly. However, this configuration consumes more board space than SMD options and lacks the thermal performance benefits of direct copper bonding. For high-density designs, engineers must weigh the ease of repair and durability against space efficiency. Additionally, PC pin terminations simplify hand-soldering but may introduce parasitic inductance in fast-switching circuits, though this is less critical in thermostat applications.
How does the moisture sensitivity level (MSL) classification of the 67L120-0378 impact storage and handling in automated manufacturing processes?
Classified as MSL 1, the 67L120-0378 has unlimited shelf life under normal storage conditions and requires no special drying before reflow or soldering. This simplifies logistics and inventory management in high-volume production lines, where exposure to ambient humidity during assembly is typically brief. Manufacturers can proceed directly to wave or reflow soldering without bake-out procedures, reducing process complexity and downtime—advantages that make it suitable for automated pick-and-place systems common in EMS operations.
In what ways does the SPST-NC configuration of the 67L120-0378 affect fail-safe logic design in power control systems?
As an SPST Normally Closed (NC) switch, the 67L120-0378 opens its circuit when heated above 120°C, thereby interrupting current flow. This inherently fails-open behavior provides natural protection in over-temperature scenarios, aligning well with safety principles that assume component failure leads to shutdown. When wired in series with a control relay or power transistor, the thermostat ensures that power is cut off if cooling fails—a key feature in heater controllers or motor drives. However, designers must confirm that downstream loads do not generate back-EMF or transient voltages that could damage adjacent components upon disconnection.
What role does the base product number 67L120 play in sourcing and supply chain strategy when planning long-term availability of the 67L120-0378?
The base number 67L120 indicates a family of thermostats with identical form, fit, and function across multiple variants—such as different setpoints or packaging. This standardization aids in multi-location design reuse and simplifies BOM management. For supply continuity, relying on the broader 67L120 series allows flexibility in selecting alternate models if specific ratings are discontinued. However, interchangeability depends on verifying electrical characteristics and mechanical compatibility, particularly when substituting between tube-packaged and reel-mounted versions, which may differ in lead length or orientation.
How should the reset temperature specification of the 67L120-0378 inform system recovery logic after an over-temperature event?
The 67L120-0378 resets at 85°C, meaning the thermostat will close again only after the surrounding medium cools sufficiently below this threshold. This prevents nuisance restarts in systems where ambient heat persists, ensuring sustained protection during prolonged faults. In contrast, some bimetallic switches offer manual reset, offering intentional user intervention. For automated recovery, designers may pair the thermostat with a latching circuit or timer to delay reconnection until full cooldown is verified, enhancing operational safety in enclosed or poorly ventilated enclosures.

Parts with Similar Specifications

The three parts on the right have similar specifications to Sensata-Airpax 67L120-0378

Product Attribute 67L120-0257 67L120-0287 67L125-0379 67L120-0350
Part Number 67L120-0257 67L120-0287 67L125-0379 67L120-0350
Manufacturer Sensata-Airpax Sensata-Airpax Sensata-Airpax Sensata-Airpax
Reset Temperature - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Current Rating - DC - - - -
Termination Style - - - -
Series - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Current Rating - AC - - - -
Switching Temperature - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Switching Cycles - - - -
Tolerance - - - -
Circuit - - - -

67L120-0378 Datasheet PDF

Download 67L120-0378 pdf datasheets and Sensata-Airpax documentation for 67L120-0378 - Sensata-Airpax.

Datasheets
6700 Series Datasheet.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Arch***ct
    Jul 15, 2026

    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
    Jul 7, 2026

    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

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Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

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Delivery Method

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Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
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Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


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67L120-0378 Image

67L120-0378

Sensata-Airpax
32D-67L120-0378

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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