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Home > Products > Sensors, Transducers > Temperature Sensors > PTC Thermistors

NXP Semiconductors KTY83/121,113

Name: KTY83/121,113
Brand: NXP Semiconductors
SKU: KTY83/121,113
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KTY83/121,113

Manufacturer:: NXP Semiconductors

Category:: PTC Thermistors

Package:: DO-204AG, DO-34, Axial

Datasheet:: KTY83/121,113.pdf

Description:: SENSOR PTC 990OHM DO34

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Product details

Overview

KTY83/121,113 from NXP Semiconductors is a silicon-based positive temperature coefficient (PTC) temperature sensor in SOD68 (DO-34) axial-leaded glass package, delivering 980–1000 Ω resistance at 25 °C, 0.76 %/K temperature coefficient, and ±1.31 K max error at 25 °C for use in motor winding thermal protection and HVAC ambient sensing circuits.

For engineers reviewing the KTY83/121,113 datasheet, KTY83/121,113 pinout, KTY83/121,113 application, or KTY83/121,113 equivalent, this page provides verified resistance vs. temperature data, thermal time constant behavior in air/liquid, long-term drift specification, fail-safe PTC response, and direct comparison with KTY83/120 and KTY83/122 variants for precision analog temperature monitoring designs.

Technical Context

The KTY83/121,113 operates as a two-terminal passive resistive sensor requiring external bias current (typically 1 mA) to generate voltage proportional to temperature. Its PTC behavior ensures monotonic, fail-safe resistance increase with rising temperature-critical for overtemperature shutdown detection.

It exhibits virtually linear resistance vs. temperature characteristics between −55 °C and +175 °C, with R₋₅₅/R₂₅ = 0.49–0.51 and R₁₀₀/R₂₅ = 1.65–1.69, enabling accurate analog-to-temperature conversion using simple polynomial or lookup-table compensation in microcontroller-based systems.

Key Specifications

Parameter	Value and Actual Design Meaning
R₂₅	980–1000 Ω at 25 °C with 1 mA bias - defines baseline scaling for analog front-end gain and ADC reference selection
TC	0.76 %/K typical - enables predictable resistance change of ~7.6 Ω/K near 25 °C for high-sensitivity analog readout
R₁₀₀/R₂₅	1.65–1.69 - supports linearization accuracy to ±1.31 K across 0–100 °C range without complex calibration
τ_th (liquid)	≤1 s in still liquid - allows rapid thermal response in coolant or oil immersion applications like transformer monitoring
Isen(cont)	10 mA max at 25 °C, 2 mA at 175 °C - sets upper limit for self-heating error control in high-temperature environments
Tamb range	−55 to +175 °C - qualifies for under-hood automotive, industrial motor, and power electronics thermal management
ΔR₂₅	≤1 Ω drift after 10,000 h at 175 °C - guarantees long-term stability in continuous high-temp operation

Pinout & Package

SOD68 (DO-34) hermetically sealed glass axial-leaded package, 3.04 mm max body diameter, 25.4 mm min lead length, 0.55 mm max lead diameter.

Pin/Terminal	Circuit Role	Design Meaning
1 (cathode, k)	Current return path / reference terminal	Connected to ground or low-side of bias resistor; polarity must be observed to avoid forward conduction in series configurations
2 (anode, a)	Current input / sensing terminal	Bias current enters here; voltage measured across pins 1–2 yields temperature-proportional signal

Key Features

Feature	Design Value
Fail-safe PTC response	Resistance increases monotonically with temperature - ensures open-circuit or high-resistance fault indication on sensor failure
Virtually linear R–T curve	±1.31 K max error from 0–100 °C enables 1st-order linear compensation in MCU firmware without lookup tables
Long-term stability	≤1 Ω resistance drift after 10,000 h at 175 °C - eliminates need for field recalibration in sealed industrial equipment
Hermetic SOD68 packaging	DO-34 glass encapsulation withstands humidity, chemical exposure, and thermal cycling in harsh environments
High-temperature operation	Rated up to +175 °C ambient - suitable for direct mounting on IGBT heatsinks, motor windings, and power transformers

Applications

Motor Winding Protection	HVAC Ambient Sensing
Use Scenario: Embedded inside stator windings of industrial AC motors to detect thermal overload before insulation breakdown. IC Role / Device Role / Timing Role: Passive resistive temperature transducer providing analog feedback to motor controller's analog input channel. Use Value: Fail-safe PTC behavior ensures resistance rise on overheating triggers immediate shutdown, preventing irreversible winding damage.	Use Scenario: Mounted on duct walls or air handlers in commercial HVAC systems to monitor supply/return air temperature. IC Role / Device Role / Timing Role: Two-terminal analog temperature element interfaced with 12-bit ADC and low-power microcontroller. Use Value: ±1.31 K accuracy at 25 °C and <1 s thermal time constant in airflow enable responsive climate control without digital sensor latency.
Power Transformer Monitoring	Automotive Under-Hood Sensing
Use Scenario: Immersed in transformer oil to track core and winding temperature during load transients and fault conditions. IC Role / Device Role / Timing Role: Hermetically sealed SOD68 sensor directly coupled to oil for fast thermal transfer and long-term reliability. Use Value: ≤1 Ω drift after 10,000 h at 175 °C ensures stable calibration over multi-year transformer service life without maintenance.	Use Scenario: Mounted on engine control unit (ECU) housing or near exhaust manifolds to monitor ambient under-hood temperature. IC Role / Device Role / Timing Role: High-temp PTC sensor biased at 1 mA, feeding voltage divider into ECU's analog input with cold-junction compensation. Use Value: −55 to +175 °C operating range and DO-34 mechanical robustness survive vibration, thermal shock, and oil exposure in automotive environments.

Motor Winding Protection

HVAC Ambient Sensing

Use Scenario: Embedded inside stator windings of industrial AC motors to detect thermal overload before insulation breakdown.

IC Role / Device Role / Timing Role: Passive resistive temperature transducer providing analog feedback to motor controller's analog input channel.

Use Value: Fail-safe PTC behavior ensures resistance rise on overheating triggers immediate shutdown, preventing irreversible winding damage.

Use Scenario: Mounted on duct walls or air handlers in commercial HVAC systems to monitor supply/return air temperature.

IC Role / Device Role / Timing Role: Two-terminal analog temperature element interfaced with 12-bit ADC and low-power microcontroller.

Use Value: ±1.31 K accuracy at 25 °C and <1 s thermal time constant in airflow enable responsive climate control without digital sensor latency.

Power Transformer Monitoring

Automotive Under-Hood Sensing

Use Scenario: Immersed in transformer oil to track core and winding temperature during load transients and fault conditions.

IC Role / Device Role / Timing Role: Hermetically sealed SOD68 sensor directly coupled to oil for fast thermal transfer and long-term reliability.

Use Value: ≤1 Ω drift after 10,000 h at 175 °C ensures stable calibration over multi-year transformer service life without maintenance.

Use Scenario: Mounted on engine control unit (ECU) housing or near exhaust manifolds to monitor ambient under-hood temperature.

IC Role / Device Role / Timing Role: High-temp PTC sensor biased at 1 mA, feeding voltage divider into ECU's analog input with cold-junction compensation.

Use Value: −55 to +175 °C operating range and DO-34 mechanical robustness survive vibration, thermal shock, and oil exposure in automotive environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar silicon PTC temperature sensor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
KTY83/120	R₂₅ = 980–1020 Ω; wider tolerance band than KTY83/121,113's 980–1000 Ω	Higher max error (±2.62 K at 25 °C) limits use in tighter accuracy requirements	Select when cost sensitivity outweighs ±1.31 K vs. ±2.62 K error budget and board-level calibration is feasible
KTY83/122	R₂₅ = 1000–1020 Ω; 20 Ω higher nominal resistance than KTY83/121,113	Requires front-end gain adjustment to maintain same ADC code per °C scaling	Choose when legacy designs already use KTY83/122 and minimal circuit modification is preferred over recalibration

Compared with KTY83/120 and KTY83/122, the KTY83/121,113 offers the tightest R₂₅ tolerance (980–1000 Ω) and lowest temperature error (±1.31 K), making it optimal for applications demanding highest initial accuracy without factory trimming or software correction.

Availability

KTY83/121,113 is available at Aetrix Electronics and suitable for motor protection, HVAC control, and power transformer monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for KTY83/121,113 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The KTY83 series belongs to NXP's analog sensor portfolio, designed specifically for high-reliability, high-temperature resistive temperature sensing where fail-safe PTC behavior and long-term stability are mandatory.

FAQ

What is the maximum continuous operating temperature for KTY83/121,113?

KTY83/121,113 is rated for continuous operation from −55 °C to +175 °C ambient temperature. At the upper limit, its maximum continuous sensor current is reduced to 2 mA to limit self-heating and ensure long-term stability. This rating is validated per IEC 60134 absolute maximum ratings and supports direct mounting on high-temperature surfaces such as motor windings and power transformer cores. The KTY83/121,113 maintains specified resistance accuracy and drift performance within this full range.

How does KTY83/121,113 differ from KTY83/110 in terms of resistance and accuracy?

KTY83/121,113 has an R₂₅ range of 980–1000 Ω and ±1.31 K max temperature error at 25 °C, whereas KTY83/110 specifies 990–1010 Ω and ±3.08 K error at −55 °C (worsening at extremes). The KTY83/121,113 offers tighter R₂₅ tolerance and lower mid-range error, making it preferable for applications requiring higher initial accuracy without calibration. Both share identical SOD68 packaging and PTC characteristics, but KTY83/121,113 is optimized for improved 0–100 °C performance.

Can KTY83/121,113 be used in flowing liquid environments?

Yes, KTY83/121,113 achieves a thermal time constant (τ_th) of ≤0.5 s in flowing liquid, enabling rapid response in coolant, oil, or refrigerant monitoring applications. Its hermetically sealed SOD68 glass package prevents moisture ingress and ensures long-term reliability in immersion conditions. When mounted in flow paths with velocity >0.5 m/s, the KTY83/121,113 delivers sub-second thermal tracking essential for real-time thermal protection in power electronics and industrial machinery.

What is the recommended bias current for KTY83/121,113 to minimize self-heating error?

A bias current of 1 mA is recommended for KTY83/121,113 across its full operating range, especially above 100 °C, to keep self-heating-induced temperature error low. At 1 mA and 1000 Ω nominal resistance, power dissipation is only 1 mW - well below the threshold that causes measurable thermal offset. Using higher currents (e.g., 5 mA) increases self-heating error beyond ±0.5 K and accelerates long-term drift; the KTY83/121,113 datasheet explicitly recommends 1 mA for precision applications.

Is KTY83/121,113 RoHS compliant and halogen-free?

Yes, KTY83/121,113 conforms to RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The SOD68 glass package contains no lead in the solder seal, and all internal materials meet NXP's EcoDesign requirements. Compliance documentation, including Declaration of Conformity and material content reports, is available through NXP's official product portal and authorized distributors. The KTY83/121,113 is qualified for use in environmentally regulated industrial and automotive markets.

KTY83/121,113 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: KTY83

Package/Case:: DO-204AG, DO-34, Axial

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Resistance @ 25°C:: 990 Ohms

Resistance Tolerance:: -

Operating Temperature:: -55°C ~ 175°C

Power - Max:: -

Mounting Type:: Through Hole

Grade:: -

Qualification:: -

Supplier Device Package:: DO-34

KTY83/121,113 FAQ

1.How can I place an order for KTY83/121,113 through Aetrix?

Please submit a Request for Quotation (RFQ) for KTY83/121,113 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for KTY83/121,113 reliable?

The price and inventory of KTY83/121,113 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KTY83/121,113 is usually 5 days.

3.What payment methods are accepted for KTY83/121,113?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KTY83/121,113 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KTY83/121,113?

KTY83/121,113 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KTY83/121,113 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for KTY83/121,113?

For technical support, including KTY83/121,113 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KTY83/121,113 requirements.

6.How does Aetrix verify that KTY83/121,113 is sourced from the original manufacturer or authorized distributors?

All KTY83/121,113 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that KTY83/121,113 meets industry standards.

7.What is the process for return or replacement of KTY83/121,113?

All KTY83/121,113 units undergo pre-shipment inspection (PSI). If there is an issue with KTY83/121,113, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The KTY83/121,113 part is unused and in its original packaging.

Return procedure for KTY83/121,113:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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