KTY23-6 PTC Thermistor Equivalent & Substitute Parts

Part Overview

The KTY23-6 is a PTC thermistor manufactured by Infineon Technologies, rated at 1 kOhms with ±3% tolerance in a SOT-23-3 surface mount package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. The KTY23-6 operates across a wide temperature range of -50°C to 150°C, serving applications requiring thermal sensing and protection in compact form factors.

Key Parameters

Parameter	Value
Manufacturer Part Number	KTY23-6
Manufacturer	Infineon Technologies
Category	Temperature Sensors
Resistance @ 25°C	1 kOhms
Resistance Tolerance	±3%
Operating Temperature Range	-50°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SOT-23-3
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the KTY23-6 is determined by the following critical parameters:

Package Compatibility: All substitute parts must use SOT-23-3 surface mount packaging to ensure mechanical and electrical compatibility with existing PCB layouts.
Mounting Type: Surface mount requirement is mandatory across all alternatives.
Moisture Sensitivity Level: MSL 1 (Unlimited) is maintained across all qualified substitutes.
Compliance Standards: REACH Unaffected and ECCN EAR99 status ensures regulatory alignment.

The substitute parts listed are grouped into two functional categories based on their operating characteristics:

LM62 Series (Texas Instruments / National Semiconductor): Analog output temperature sensors with 0°C ~ 90°C sensing range, 15.6mV/°C resolution, and ±2°C to ±3°C accuracy. These are direct functional replacements for applications within the 0°C ~ 90°C window.
TC1047 Series (Microchip Technology): Analog output temperature sensors with extended -40°C ~ 125°C sensing range, 10mV/°C resolution, and ±2°C to ±3°C accuracy. These provide broader temperature coverage suitable for applications requiring extended operating ranges.

Parameter Comparison

Part Number	Manufacturer	Sensor Type	Operating Temperature	Output Type	Resolution	Accuracy	Package	Product Status	Inventory
KTY23-6	Infineon Technologies	PTC Thermistor	-50°C ~ 150°C	Resistance	1 kOhms @ 25°C	±3%	SOT-23-3	Obsolete	2400 Pcs
LM62BIM3/NOPB	Texas Instruments	Analog, Local	0°C ~ 90°C	Analog Voltage	15.6mV/°C	±2°C	SOT-23-3	Obsolete	1385 Pcs
LM62BIM3X/NOPB	National Semiconductor	Analog, Local	0°C ~ 90°C	Analog Voltage	15.6mV/°C	±2°C	SOT-23-3	Active	2631 Pcs
LM62CIM3X/NOPB	Texas Instruments	Analog, Local	0°C ~ 90°C	Analog Voltage	15.6mV/°C	±3°C	SOT-23-3	Active	702 Pcs
TC1047AVNBTR	Microchip Technology	Analog, Local	-40°C ~ 125°C	Analog Voltage	10mV/°C	±2°C	SOT-23-3	Active	38200 Pcs
TC1047VNBTR	Microchip Technology	Analog, Local	-40°C ~ 125°C	Analog Voltage	10mV/°C	±2°C	SOT-23-3	Active	6400 Pcs

Engineering Selection Recommendations

For applications operating within 0°C ~ 90°C:

Select LM62BIM3X/NOPB or LM62CIM3X/NOPB. Both are active products with ROHS3 compliance and unlimited MSL rating. LM62BIM3X/NOPB offers ±2°C accuracy with 2631 Pcs in stock. LM62CIM3X/NOPB provides ±3°C accuracy matching the KTY23-6 tolerance specification with 702 Pcs available.

For applications requiring extended temperature coverage (-40°C ~ 125°C):

Select TC1047AVNBTR or TC1047VNBTR. Both are active Microchip products with ROHS3 compliance and unlimited MSL rating. TC1047AVNBTR supports 2.5V ~ 5.5V supply with 38200 Pcs in stock. TC1047VNBTR operates at 2.7V ~ 4.4V supply with 6400 Pcs available. Both deliver ±2°C accuracy across their operating range.

Product Status Consideration:

LM62BIM3/NOPB is classified as obsolete. Prioritize active products (LM62BIM3X/NOPB, LM62CIM3X/NOPB, TC1047AVNBTR, TC1047VNBTR) for new designs to ensure long-term supply continuity and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can the KTY23-6 be directly replaced with LM62 series sensors?

A: LM62 series sensors are functionally compatible within the 0°C ~ 90°C operating window. Both use SOT-23-3 packaging and provide analog voltage output. However, the KTY23-6 operates to 150°C while LM62 sensors are limited to 90°C. Application temperature requirements must be verified before substitution.

Q: What is the key difference between LM62 and TC1047 series?

A: LM62 sensors operate from 0°C ~ 90°C with 15.6mV/°C resolution. TC1047 sensors extend to -40°C ~ 125°C with 10mV/°C resolution. TC1047 provides broader temperature coverage; LM62 provides higher voltage sensitivity per degree Celsius.

Q: Are all substitute parts RoHS compliant?

A: LM62BIM3/NOPB status is not specified. LM62BIM3X/NOPB, LM62CIM3X/NOPB, TC1047AVNBTR, and TC1047VNBTR are all ROHS3 compliant.

Q: Does package compatibility guarantee electrical compatibility?

A: SOT-23-3 package compatibility ensures mechanical fit and pin assignment alignment. Electrical compatibility requires matching supply voltage ranges, output type (analog voltage), and operating temperature specifications to application requirements.

Q: Which substitute offers the highest inventory availability?

A: TC1047AVNBTR provides the highest stock level at 38200 Pcs, followed by LM62BIM3X/NOPB at 2631 Pcs.

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