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

Manufacturer Part Number
67L120
Manufacturer
Airpax / Sensata Technologies
Allelco Part Number
32D-67L120
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
4,880 pcs available, New & Original
Parts Description
THERMOSTAT 120DEG C NC TO220-2
Package
TO-220-2
Data sheet
67L120.pdf
RoHs Status
RoHS Compliant
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Our certification
In stock: 4880
  • Unit Price: $10.13
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $10.13 $10.13
200+ $4.04 $808.00
500+ $3.91 $1,955.00
1000+ $3.84 $3,840.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

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

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

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 thermal performance characteristics of the Sensata-Airpax 67L120 thermostat that influence its use in over-temperature protection circuits?
The 67L120 operates with a switching temperature of 248°F (120°C) and a reset temperature of 185°F (85°C), resulting in a hysteresis of approximately 63°F (35°C). This hysteresis prevents rapid cycling near the setpoint, which is critical in systems where thermal inertia or transient loads could otherwise cause nuisance shutdowns. The ±9°F (±5°C) tolerance means actual switching occurs between 239°F and 257°F under standard conditions, requiring designers to factor this variation into safety margins. These parameters make it suitable for applications where gradual heat buildup needs to be detected without false triggers from momentary spikes.
How does the current handling capability of the 67L120 compare to similar SPST-NC thermostats used in industrial motor control applications?
The 67L120 supports up to 0.5A at 48VDC in continuous operation, which is lower than many mechanical relays but sufficient for control logic, fan drives, or low-power heater elements. In comparison, some industrial-grade thermostats rated for 10–20A are typically used only for load disconnection, whereas the 67L120’s design prioritizes precision over high-current switching. For motor windings or larger resistive loads exceeding 24W, alternative components with higher current ratings would be necessary, making the 67L120 better suited for signaling or enabling functions rather than direct load interruption.
Can the 67L120 be used reliably in environments with frequent thermal cycling, and what design considerations apply given its 20K switching cycle rating?
With a rated endurance of 20,000 cycles, the 67L120 can endure thousands of on/off transitions typical of intermittent overheating scenarios, such as cooling fans failing repeatedly during seasonal temperature swings. However, each cycle induces mechanical stress due to bimetallic strip fatigue. Engineers should avoid using it beyond this limit by implementing software-based fault counters or redundant sensors in mission-critical systems. In most embedded applications—such as consumer electronics enclosures or HVAC dampers—the cycle life far exceeds expected operational lifetimes, making reliability not a primary concern.
What mounting and layout constraints arise when integrating the 67L120 into a PCB-based thermal management system?
The TO-220-2 package uses through-hole PC pins compatible with standard double-row headers, allowing secure solder joints and good thermal conduction if the PCB pad is properly sized. However, unlike surface-mount devices, it requires manual alignment and may obstruct nearby components due to its height (~10mm). Thermal vias beneath the case can enhance heat transfer to the board, but care must be taken not to short the two output leads during soldering. Given its NC (normally closed) configuration, placement near the heated zone ensures timely response while maintaining accessibility for inspection.
How does the reset behavior of the 67L120 affect system recovery logic compared to latching or manual-reset thermostats?
Upon cooling below 185°F, the 67L120 automatically recloses its contacts, enabling automatic recovery after an over-temperature event. This differs from latch-type devices requiring external reset, offering convenience in non-critical applications like appliance controls. However, in safety-sensitive contexts such as battery packs or power supplies, automatic reset might mask a persistent fault condition. Designers often pair the 67L120 with a microcontroller monitoring both temperature and contact status to distinguish between transient and sustained faults, adding intelligence without sacrificing fail-safe behavior.
Is the 67L120 suitable for use in automotive or high-vibration environments, and what environmental qualifications support this?
While the datasheet does not explicitly certify automotive compliance, its RoHS status and MSL Level 1 indicate suitability for general industrial and commercial electronics. The robust TO-220 housing and mechanical switch construction provide reasonable resistance to vibration, but prolonged exposure to severe automotive environments may accelerate contact wear. For such cases, sealed reed switches or solid-state alternatives would be preferable. The 67L120 remains viable in stationary or light-duty mobile applications where moderate vibration and ambient temperatures below 120°C prevail.
How does the 67L120’s tolerance specification impact calibration efforts in precision thermal regulation systems?
The ±9°F (±5°C) tolerance implies that two units may switch at different absolute temperatures even under identical conditions. In calibration-intensive designs—such as medical equipment or laboratory instruments—this variability necessitates individual testing or statistical binning. Designers might select multiple samples and characterize their actual trip points before deployment, or incorporate adjustable setpoints via external potentiometers. For most consumer or industrial control tasks, however, this margin falls within acceptable bounds and does not compromise functional safety.
What are the implications of the 67L120’s NC contact type for fail-safe architecture in power supply over-temperature protection?
As an SPST-NC device, the 67L120 opens its circuit upon reaching 248°F, breaking the enable signal to downstream circuitry. This aligns with fail-open safety principles: any malfunction results in loss of function rather than unintended activation. When used to disable a microcontroller’s power rail, for instance, the system halts cleanly upon overheating. Engineers must ensure downstream components do not generate back-EMF or leakage currents that could sustain operation momentarily after contact opening. Snubber networks or optoisolators help decouple sensitive logic from the switch output.
How does the 67L120 compare thermally and electrically to the 67M120 model from the same series?
While both belong to the 6700 series and share the same TO-220-2 footprint and 120°C nominal setpoint, the 67M120 features a normally open (NO) contact configuration instead of NC. This changes system-level logic: the NO version closes on overheat, useful for triggering alarms or activating cooling fans, whereas the NC version interrupts power. Electrically, they are otherwise identical in current rating and hysteresis. Selection depends on whether the application requires disabling a circuit (NC) or activating auxiliary actions (NO).
What precautions should be taken when soldering the 67L120 to avoid damaging its internal mechanism or compromising contact integrity?
Excessive heat (>350°C) or prolonged exposure during reflow can degrade the bimetallic element or damage the epoxy encapsulation. Hand soldering at 300–330°C for less than three seconds per pin is recommended. Use flux with low halogen content to prevent residue-induced corrosion. Avoid applying pressure to the body during insertion. After assembly, inspect for cold solder joints or bridging between the two output leads, as shorts could bypass the thermostat’s protective function. Proper handling preserves both electrical continuity and mechanical reliability over time.
Can the 67L120 replace a traditional thermal fuse in a battery charger circuit, and what trade-offs exist?
Unlike fuses that permanently open on overcurrent or overtemperature, the 67L120 resets automatically and survives repeated trips. This makes it ideal for reversible protection in battery chargers where temperature fluctuations occur cyclically. However, fuses offer simpler, one-shot failure modes ideal for irreversible shutdowns. The 67L120 adds cost and complexity but provides reusable protection. If the charger lacks feedback loops to detect internal faults beyond temperature, relying solely on the 67L120 could allow continued operation after a degraded cell causes sustained overheating—highlighting the need for layered protection strategies.
How does the absence of AC current rating impact the 67L120’s applicability in AC-powered heating systems?
The lack of specified AC rating suggests the manufacturer has not tested or validated performance under alternating current, likely due to arcing risks at higher voltages or frequencies. Since contact erosion accelerates with AC zero-crossings, using the 67L120 in mains-connected heaters introduces uncertainty about long-term reliability. For AC applications, dedicated thermal cutoffs rated for AC loads (e.g., with arc suppression chambers) are preferred. The 67L120 remains appropriate only for DC-side control signals or low-voltage AC circuits (<12V RMS) where arcing is minimal.
What role does the 67L120 play in redundancy schemes for mission-critical thermal monitoring, and how should it interface with digital sensors?
In redundant architectures, the 67L120 serves as a hardware-enforced backup to microcontroller-based temperature sensing. Its analog, non-programmable nature ensures independence from software bugs or communication failures. A common practice involves routing the 67L120’s NC contact in series with the main enable line, so that either a software-detected anomaly or a physical overheat triggers shutdown. Digital sensors like thermistors feed into the MCU for diagnostics, while the 67L120 provides uncorrupted mechanical action. This dual-path design meets safety standards requiring diverse failure modes.
How does the 67L120’s package style affect thermal coupling to the monitored object compared to surface-mount alternatives?
The TO-220-2’s metal case allows direct attachment to heatsinks or metallic enclosures via clip-on or screw mounting, improving thermal conductivity versus isolated PCB-mounted versions. However, PC pin terminations reduce surface contact area unless the device is potted or thermally conductive adhesive is used. For optimal response, the sensor should be mounted flush against the target component with minimal thermal resistance. In contrast, SMD thermostats rely entirely on PCB metallization, which may introduce parasitic thermal lag. The 67L120 thus excels in applications where direct mechanical contact enhances detection accuracy.
What are the regulatory and export classification considerations for sourcing and deploying the 67L120 internationally?
Classified under HTSUS 8536.50.9065 and ECCN EAR99, the 67L120 is generally unrestricted for export worldwide, simplifying global supply chains. RoHS compliance ensures compatibility with European directives, though regional certifications (e.g., UL, CSA) may still be required for end-product approval. Manufacturers should verify local electrical safety standards when integrating the device into finished goods, especially in jurisdictions mandating certified over-temperature switches for appliances or industrial equipment. The part itself poses no significant trade restrictions, aiding consistent procurement across markets.

Parts with Similar Specifications

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

Product Attribute 67L120-0257 67L120-0287 67L120-0378 67L125-0145
Part Number 67L120-0257 67L120-0287 67L120-0378 67L125-0145
Manufacturer Sensata-Airpax Sensata-Airpax Sensata-Airpax Sensata-Airpax
Mounting Type - Surface Mount Through Hole Surface Mount
Current Rating - DC - - - -
Termination Style - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Current Rating - AC - - - -
Tolerance - - - -
Circuit - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Switching Cycles - - - -
Switching Temperature - - - -
Series - - - -
Reset Temperature - - - -

67L120 Datasheet PDF

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

Datasheets
6700 Series Datasheet.pdf

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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

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

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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67L120 Image

67L120

Sensata-Airpax
32D-67L120

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

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