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KTY82/121,235 PTC Thermistor Equivalent & Substitute Parts
Part Overview
The KTY82/121,235 is a PTC thermistor manufactured by NXP USA Inc., rated at 990 Ohms at 25°C in a TO-236-3 (SOT-23-3) surface mount package. This component operates across a temperature range of -55°C to 150°C and is compliant with ROHS3 and REACH standards. The product is currently listed as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | KTY82/121,235 |
| Manufacturer | NXP USA Inc. |
| Category | Temperature Sensors |
| Product Type | PTC Thermistor |
| Resistance @ 25°C | 990 Ohms |
| Operating Temperature Range | -55°C ~ 150°C |
| Package / Case | TO-236-3, SC-59, SOT-23-3 |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the KTY82/121,235 is based on the following critical parameters:
Package Compatibility: All substitute parts must use the TO-236-3 (SOT-23-3) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.
Sensor Type & Output: The KTY82/121,235 is a PTC thermistor with resistance-based output. Substitute parts listed are analog temperature sensors with voltage output, representing a functional shift from resistance-based to voltage-based temperature sensing. This substitution requires circuit redesign to accommodate analog voltage output instead of resistance measurement.
Operating Temperature Range: The original part operates from -55°C to 150°C. Substitute parts operate within -40°C to 125°C or 0°C to 90°C ranges, which may not cover the full lower temperature specification of the original component.
Compliance & Certification: All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring environmental and moisture handling compatibility.
Product Status: Active substitute parts are preferred for new designs and long-term availability.
Parameter Comparison
| Part Number | Manufacturer | Sensor Type | Operating Temperature | Output Type | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|
| KTY82/121,235 | NXP USA Inc. | PTC Thermistor | -55°C ~ 150°C | Resistance | SOT-23-3 | Obsolete | ROHS3 |
| DS60R+T&R | Analog Devices Inc./Maxim Integrated | Analog, Local | -40°C ~ 125°C | Analog Voltage | SOT-23-3 | Active | ROHS3 |
| LM60QIM3/NOPB | Texas Instruments | Analog, Local | -40°C ~ 125°C | Analog Voltage | SOT-23-3 | Obsolete | ROHS3 |
| LM60QIM3X/NOPB | Texas Instruments | Analog, Local | -40°C ~ 125°C | Analog Voltage | SOT-23-3 | Active | ROHS3 |
| LM62BIM3/NOPB | Texas Instruments | Analog, Local | 0°C ~ 90°C | Analog Voltage | SOT-23-3 | Obsolete | ROHS3 |
| LM62BIM3X/NOPB | National Semiconductor | Analog, Local | 0°C ~ 90°C | Analog Voltage | SOT-23-3 | Active | Not specified |
| LM62CIM3X/NOPB | Texas Instruments | Analog, Local | 0°C ~ 90°C | Analog Voltage | SOT-23-3 | Active | ROHS3 |
| MCP9701T-E/TT | Microchip Technology | Analog, Local | -10°C ~ 125°C | Analog Voltage | SOT-23-3 | Active | ROHS3 |
| TC1047AVNBTR | Microchip Technology | Analog, Local | -40°C ~ 125°C | Analog Voltage | SOT-23-3 | Active | ROHS3 |
| TC1047VNBTR | Microchip Technology | Analog, Local | -40°C ~ 125°C | Analog Voltage | SOT-23-3 | Active | ROHS3 |
Engineering Selection Recommendations
For Full Temperature Range Coverage (-55°C to 150°C): No direct substitute maintains the complete operating temperature range of the KTY82/121,235. The highest coverage available is -40°C to 125°C with DS60R+T&R, LM60QIM3/NOPB, LM60QIM3X/NOPB, TC1047AVNBTR, and TC1047VNBTR. Applications requiring operation below -40°C or above 125°C cannot be directly substituted with the listed parts.
For Active Product Status & Long-Term Availability: DS60R+T&R, LM60QIM3X/NOPB, LM62BIM3X/NOPB, LM62CIM3X/NOPB, MCP9701T-E/TT, TC1047AVNBTR, and TC1047VNBTR are all active products with current manufacturing support.
For ROHS3 Compliance: All substitute parts except LM62BIM3X/NOPB carry explicit ROHS3 certification, matching the original component's compliance status.
For Automotive Grade Applications: LM60QIM3/NOPB and LM60QIM3X/NOPB carry AEC-Q100 qualification, suitable for automotive temperature sensor applications.
Critical Design Consideration: The KTY82/121,235 is a resistance-based sensor requiring measurement circuitry to convert resistance to a usable signal. All listed substitutes are voltage-output analog sensors, requiring redesign of the signal conditioning circuit. This is a functional substitution, not a pin-compatible replacement.
Frequently Asked Questions (FAQ)
Q: Can I directly replace the KTY82/121,235 with any of these substitute parts without circuit modification?
A: No. The KTY82/121,235 outputs a resistance value, while all listed substitutes output an analog voltage. Your circuit must be redesigned to accept voltage input instead of measuring resistance. The SOT-23-3 package is mechanically compatible, but electrical interface changes are mandatory.
Q: Which substitute covers the widest temperature range?
A: DS60R+T&R, LM60QIM3/NOPB, LM60QIM3X/NOPB, TC1047AVNBTR, and TC1047VNBTR all operate from -40°C to 125°C. None reach the original -55°C lower limit. For applications requiring sub -40°C operation, no substitute from this list is suitable.
Q: What is the difference between LM60QIM3/NOPB and LM60QIM3X/NOPB?
A: Both are Texas Instruments analog temperature sensors with identical electrical specifications (-40°C to 125°C, 6.25mV/°C resolution, ±3°C accuracy). The primary difference is product status: LM60QIM3/NOPB is obsolete, while LM60QIM3X/NOPB is active. For new designs, LM60QIM3X/NOPB is recommended.
Q: Are all substitutes available in the same packaging?
A: Yes. All listed substitute parts use the TO-236-3 (SOT-23-3) surface mount package, ensuring mechanical compatibility with existing PCB layouts. Packaging format varies between Cut Tape (CT), Tape & Reel (TR), and Bulk, but the component package itself is identical.
Q: Which substitute has the best accuracy specification?
A: DS60R+T&R and TC1047AVNBTR both offer ±2°C accuracy at 25°C, matching the best available specifications in this list.
Q: Can I use LM62BIM3/NOPB or LM62CIM3X/NOPB if my application only operates between 0°C and 90°C?
A: Yes, if your application temperature range is strictly 0°C to 90°C, LM62BIM3/NOPB (obsolete) or LM62CIM3X/NOPB (active) are suitable. LM62CIM3X/NOPB is preferred due to active product status. These parts offer higher resolution (15.6mV/°C) compared to the -40°C to 125°C range sensors, providing better temperature discrimination in limited ranges.
Q: What does MSL Level 1 mean for these components?
A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture baking requirements. All listed parts carry MSL Level 1, meaning they can be stored indefinitely without special moisture control procedures before soldering.
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