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HomeProductsSensors, TransducersTemperature Sensors - Thermostats - Mechanical67L125-0379
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67L125-0379 - Sensata-Airpax

Manufacturer Part Number
67L125-0379
Manufacturer
Airpax / Sensata Technologies
Allelco Part Number
98D-67L125-0379
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
41,683 pcs available, New & Original
Parts Description
THERMOSTAT 125DEG C NC TO220-2
Package
TO-220-2
Data sheet
67L125-0379.pdf
RoHs Status
RoHS Compliant
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Our certification
In stock: 41683
  • Unit Price: $13.81
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $13.81 $13.81
200+ $5.51 $1,102.00
500+ $5.33 $2,665.00
1000+ $5.23 $5,230.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

67L125-0379 Tech Specifications
Sensata-Airpax - 67L125-0379 technical specifications, attributes, parameters and parts with similar specifications to Sensata-Airpax - 67L125-0379

Product Attribute Attribute Value
Manufacturer Airpax / Sensata Technologies
Tolerance ±9°F (±5°C)
Termination Style PC Pins
Switching Temperature 257°F (125°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 67L125

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)

What are the key electrical and thermal performance characteristics of the Sensata-Airpax 67L125-0379 thermostat that influence its suitability for industrial motor control applications?
The 67L125-0379 operates with a switching temperature of 257°F (125°C) and a reset temperature of 185°F (85°C), providing a hysteresis window of approximately 72°F (40°C). This hysteresis reduces chattering in thermal protection circuits, which is critical for stable operation in motor drives. With a DC current rating of 0.5A at 48V, it can safely interrupt inductive loads common in motor windings. The ±9°F (±5°C) tolerance means actual trip points may vary by up to 5°C, so designs should allow for this variation when selecting thermal cutoffs. Its SPST-NC configuration ensures fail-safe operation—open contacts prevent overheating when power is lost.
How does the 67L125-0379 compare to similar thermostats like the 67L115 or 67L135 in terms of switching thresholds and application suitability?
The 67L125-0379 switches at 125°C, while the 67L115 operates at 115°C and the 67L135 at 135°C. In high-temperature environments such as inverter modules or transformer enclosures, the 67L125 offers a middle ground between sensitivity and robustness. Compared to the 67L115, it provides greater margin before activation, reducing nuisance tripping. Versus the 67L135, it is less likely to respond prematurely under moderate overloads. However, system designers must consider whether their application’s peak operating temperature aligns closer to one threshold; for example, a 120°C-rated PCB material might require the lower-trip 67L115 for reliable protection.
What design considerations arise from the TO-220-2 package and PC pin termination style of the 67L125-0379 when integrating into a printed circuit board?
The TO-220-2 package features two flat PC pins suitable for direct soldering to copper traces without requiring a heatsink in low-power thermal monitoring roles. However, due to limited surface area and lack of mounting tab continuity, thermal coupling to the PCB is modest. Engineers should ensure adequate copper pour around the pins to enhance heat dissipation and avoid localized hot spots. Mechanical stress during wave soldering may affect reliability, so reflow profiles should stay below 260°C peak to prevent damage. Additionally, spacing must comply with creepage requirements if used near high-voltage sections.
Why might an engineer choose the 67L125-0379 over solid-state thermal switches despite differences in response time and longevity?
While solid-state devices offer faster response and no moving parts, the 67L125-0379 provides mechanical latching action via bimetallic strip contact closure, ensuring persistent open state until manually reset or cooled below reset threshold—ideal for fail-safe safety interlocks. It supports up to 20,000 switching cycles, sufficient for most industrial duty cycles, and handles transient surges better than electronic alternatives. At 0.5A/48V DC, it avoids semiconductor limitations in high-current interruption, making it preferable in power supply overcurrent protection or fan control loops where galvanic isolation and robustness outweigh speed.
What impact does the ±9°F tolerance have on system-level thermal management when using the 67L125-0379?
The ±5°C tolerance implies that the actual switching point could be as low as 120°C or as high as 130°C depending on manufacturing variance. For applications requiring precise thermal cutoff—such as battery charging circuits or Class II equipment per IEC 60730—this variability necessitates derating. Designers often select a lower ambient operating limit or incorporate software-based temperature monitoring alongside hardware protection. Alternatively, calibration procedures during production assembly may compensate, but this adds cost and complexity. Therefore, the 67L125-0379 is best suited for non-critical thermal limits where absolute precision is secondary to functional reliability.
Can the 67L125-0379 be used in AC motor protection, given its DC current rating specification?
Although the datasheet specifies a DC rating of 0.5A at 48V, many thermostatic relays like the 67L125-0379 exhibit acceptable performance on AC loads due to reduced arcing across contacts compared to inductive DC switching. However, the absence of an explicit AC current rating means caution is advised. If used in AC motor circuits, contact erosion may increase, shortening lifespan. For motors drawing above 0.3A RMS, supplemental fusing or magnetic overload relays are recommended. Always verify with manufacturer testing data, as internal contact geometry and arc quenching differ between AC and DC applications.
How does the moisture sensitivity level (MSL) classification of MSL 1 benefit users of the 67L125-0379 in manufacturing and storage contexts?
With an MSL 1 rating, the 67L125-0379 is not sensitive to moisture absorption and can be stored indefinitely without baking prior to assembly. This simplifies inventory handling and reduces post-manufacturing preparation steps, lowering overall production costs. It also enables just-in-time delivery logistics common in global supply chains. No special packaging or dry storage conditions are needed, unlike components rated MSL 3 or higher, which require humidity-controlled environments to prevent solder joint defects during reflow.
What role does the base product number 67L125 play in sourcing and compatibility decisions involving the 67L125-0379?
The base product number 67L125 refers to a family of thermostats with identical form, fit, and function across multiple variants differing only in switching temperature. This allows engineers to standardize designs across product lines while maintaining interchangeability. When substituting the 67L125-0379, verifying the suffix (-0379) confirms exact part match including packaging and RoHS compliance. Using the base number alone risks selecting a different trip point (e.g., 67L125-0370), leading to incorrect thermal behavior. Thus, full model number verification ensures both parametric accuracy and regulatory alignment.

Parts with Similar Specifications

The three parts on the right have similar specifications to Sensata-Airpax 67L125-0379

Product Attribute 67L120-0378 67L125-0351 67L125-0145 67L125-0258
Part Number 67L120-0378 67L125-0351 67L125-0145 67L125-0258
Manufacturer Sensata-Airpax Sensata-Airpax Sensata-Airpax Sensata-Airpax
Termination Style - - - -
Reset Temperature - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Tolerance - - - -
Switching Cycles - - - -
Current Rating - DC - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Circuit - - - -
Current Rating - AC - - - -
Series - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Switching Temperature - - - -

67L125-0379 Datasheet PDF

Download 67L125-0379 pdf datasheets and Sensata-Airpax documentation for 67L125-0379 - Sensata-Airpax.

Datasheets
6700 Series Datasheet.pdf

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    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.

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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.

Delivery Cost

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  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

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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67L125-0379 Image

67L125-0379

Sensata-Airpax
98D-67L125-0379

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

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