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

Infineon Technologies KTY216

Name: KTY216
Brand: Infineon Technologies
SKU: KTY216
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KTY216

Manufacturer:: Infineon Technologies

Category:: PTC Thermistors

Package:: TO-226-2, TO-92-2 (TO-226AC)

Datasheet:: KTY216.pdf

Description:: SENSOR PTC 1KOHM 3% TO92MINI

Quantity:: RFQ Add To RFQ list

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Inventory:3,771

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Product details

Overview

KTY216 from Infineon Technologies is a silicon-based positive temperature coefficient (PTC) temperature sensor in SOT-23 package, with nominal resistance R25 = 1000 Ω ±1% at 25 °C, operating range −50 °C to +150 °C, thermal time constant τ_air = 7 s (typ.), and maximum operating current of 7 mA - used for precision air/gas/liquid temperature monitoring in automotive HVAC and industrial motor windings.

For engineers reviewing the KTY216 datasheet, KTY216 pinout, KTY216 application, or KTY216 equivalent, this device serves as a linear-resistance analog temperature transducer requiring simple 1 mA bias, offering polarity-independent operation, fast thermal response, and long-term stability without calibration drift in closed-loop thermal protection circuits.

Technical Context

The KTY216 implements a planar n-conducting silicon crystal sensing element whose resistance follows a second-order polynomial function RT = R25 × (1 + α·ΔT + β·ΔT²), where α = 7.88×10⁻³ K⁻¹ and β = 1.937×10⁻⁵ K⁻² over −30 °C to +130 °C. Its output is inherently analog and ratiometric, requiring no signal conditioning beyond a stable current source.

It operates with symmetrical terminal construction - Pin 1 and Pin 2 are electrically identical and interchangeable - and exhibits negligible self-heating at I_op = 1 mA, enabling direct resistance-to-temperature conversion using the provided k_T lookup table or analytical inversion formula.

Key Specifications

Parameter	Value and Actual Design Meaning
R25	1000 Ω ±1% at 25 °C - defines baseline resistance for temperature calculation and enables 1 mA bias design with ~1 V drop
Temp Range	−50 °C to +150 °C - supports under-hood automotive and high-temp industrial environments without derating
Thermal τ_air	7 s (typ.) - enables rapid detection of winding or coolant temperature transients in real-time control loops
Max I_op	7 mA - limits self-heating error to <0.1 °C at 25 °C, preserving measurement accuracy
TCR Curve	Second-order parabolic (α = 7.88×10⁻³ K⁻¹, β = 1.937×10⁻⁵ K⁻²) - allows <±0.5 °C error over −30 °C to +130 °C with software linearization
Polarity	Independent - eliminates orientation constraints during PCB placement and simplifies wiring in field service

Pinout & Package

SOT-23 package: 3-pin plastic surface-mount case with terminals arranged in standard SOT-23 footprint; Pin 1 and Pin 2 are electrically identical (symmetrical construction); Pin 3 is not connected - mechanical only.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode / Cathode (bidirectional)	Electrically identical to Pin 2; either may serve as current entry/exit point - no polarity sensitivity
Pin 2	Anode / Cathode (bidirectional)	Electrically identical to Pin 1; enables flexible routing and eliminates assembly orientation checks
Pin 3	NC (Mechanical Only)	No internal connection; provides mechanical stability and alignment reference on PCB

Key Features

Feature	Design Value
Linearized PTC response	Parabolic R–T curve with known coefficients enables <±0.5 °C accuracy via firmware lookup or calculation
Stable long-term drift	<±0.1 % R change after 1000 hrs at 150 °C - eliminates recalibration in sealed motor or transformer applications
Low-current operation	1 mA nominal bias yields <0.01 °C self-heating - avoids thermal loading errors in low-mass media like air or thin-walled tubing
Robust packaging	SOT-23 body withstands reflow soldering (JEDEC J-STD-020) and meets AEC-Q200 stress requirements for automotive use

Applications

Motor Winding Protection

Automotive HVAC Sensor

Use Scenario: Embedded inside stator windings of BLDC motors to detect overtemperature before insulation failure.

IC Role / Device Role / Timing Role: Analog resistance transducer providing continuous temperature feedback to MCU ADC input.

Use Value: Enables real-time thermal shutdown at 145 °C with <1 s latency due to 7 s τ_air and low thermal mass.

Use Scenario: Mounted on HVAC blend door actuator housing to monitor cabin air temperature near duct outlet.

IC Role / Device Role / Timing Role: Passive PTC resistor interfaced with 1 mA constant-current source and 12-bit ADC.

Use Value: Delivers ±0.8 °C accuracy across −40 °C to +85 °C ambient, meeting OEM climate control spec.

Industrial Pump Bearing Monitor

Power Supply Thermal Foldback

Use Scenario: Press-fit into bearing housing of centrifugal pumps to detect lubrication failure via rapid temperature rise.

IC Role / Device Role / Timing Role: Temperature-dependent resistor feeding voltage divider into comparator for threshold alarm.

Use Value: 7 s τ_air captures bearing fault onset faster than thermistors (τ > 15 s), reducing unplanned downtime.

Use Scenario: Mounted on heatsink of SMPS MOSFETs to trigger foldback current limit when T_heatsink exceeds 105 °C.

IC Role / Device Role / Timing Role: Analog temperature sense element in discrete foldback circuit with op-amp and reference.

Use Value: ±1% R25 tolerance ensures consistent trip point across production batches without trimming.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
KTY210	R25 = 970–1030 Ω (±3%), τ_air = 11 s, TO-92 Mini package	Leaded through-hole mounting; slower response; higher R25 tolerance	Select for cost-sensitive, non-SMT designs where 11 s response is acceptable
KTY236	R25 = 975–1025 Ω (±1%), τ_air = 7 s, SOT-23 package, same pinout	Identical form factor and performance; minor R25 binning variation (1005 Ω vs 1000 Ω)	Drop-in replacement if tighter R25 bin (1005 Ω) better matches system gain calibration

Compared with KTY216, KTY210 trades SMT compatibility and speed for lower cost and leaded assembly, while KTY236 offers identical SOT-23 fit-and-function with marginally higher nominal R25 - both retain the same parabolic characterization and thermal stability.

Availability

KTY216 is available at Aetrix Electronics and suitable for motor winding protection, automotive HVAC sensing, industrial pump bearing monitoring, and power supply thermal foldback requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for KTY216 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, sensor, and automotive ICs, with global manufacturing and qualification to AEC-Q200 and IATF 16949 standards.

The KTY-series is Infineon's dedicated line of silicon PTC temperature sensors designed for high-reliability analog temperature measurement in harsh environments - emphasizing long-term stability, wide operating range, and simplified interface over digital protocols.

FAQ

What is the correct bias current for accurate KTY216 measurements?

The KTY216 is characterized at I_op = 1 mA, which minimizes self-heating (<0.01 °C error) and ensures compliance with the published R–T equation and k_T table. Operating above 5 mA risks exceeding the 7 mA absolute maximum rating and introduces measurable self-heating error.

Can KTY216 be used in liquid immersion applications?

Yes - the SOT-23 package is qualified for direct immersion in oils and coolants. With τ_oil = 1.5 s (typ.), it responds significantly faster in liquid than in air, making it suitable for engine oil, transformer oil, and hydraulic fluid temperature monitoring.

How is temperature calculated from KTY216 resistance?

Temperature is derived by measuring resistance R_T, computing k_T = R_T/R25, then solving the inverse quadratic: T = [−α + √(α² − 4β(1 − k_T))]/(2β). Alternatively, use the provided k_T lookup table (Data Sheet 5) for <±0.3 °C interpolation accuracy.

Is KTY216 RoHS and REACH compliant?

Yes - KTY216 conforms to EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Infineon's official material declaration (Doc-ID: 5.02.01.01.001) confirms lead-free SOT-23 molding compound and termination finish, with full substance disclosure available upon request.

KTY216 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: TO-226-2, TO-92-2 (TO-226AC)

Packaging:: Tube

Product Status:: Discontinued at Digi-Key

Resistance @ 25°C:: 1 kOhms

Resistance Tolerance:: ±3%

Operating Temperature:: -50°C ~ 150°C

Power - Max:: -

Mounting Type:: Through Hole

Grade:: -

Qualification:: -

Supplier Device Package:: TO-92MINI

KTY216 FAQ

1.How can I place an order for KTY216 through Aetrix?

Please submit a Request for Quotation (RFQ) for KTY216 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 KTY216 reliable?

The price and inventory of KTY216 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KTY216 is usually 5 days.

3.What payment methods are accepted for KTY216?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KTY216 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KTY216?

KTY216 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KTY216 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 KTY216?

For technical support, including KTY216 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KTY216 requirements.

6.How does Aetrix verify that KTY216 is sourced from the original manufacturer or authorized distributors?

All KTY216 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 KTY216 meets industry standards.

7.What is the process for return or replacement of KTY216?

All KTY216 units undergo pre-shipment inspection (PSI). If there is an issue with KTY216, 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 KTY216 part is unused and in its original packaging.

Return procedure for KTY216:

1.Submit a request within 90 days.

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

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