PT503J2 NTC Thermistor 50kΩ Equivalent & Substitute Parts

Part Overview

The PT503J2 is an NTC thermistor manufactured by Littelfuse Inc., featuring a 50kΩ resistance at 25°C with a B0/50 value of 3892K. This component is classified as obsolete, making equivalent substitutes necessary for ongoing applications and new designs. The PT503J2 operates across a wide temperature range of -80°C to 150°C and is packaged as a bead with epoxy coating in a free-hanging configuration. Identification of compatible alternatives ensures design continuity and supply chain reliability.

Substiute Parts

PT503J2

Littelfuse Inc.In Stock: 1135PT503J2 Datasheet

Current PartRFQ

TT7-50KC3-3

TEWA Sensors LLCIn Stock: 1342TT7-50KC3-3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PT503J2 is determined by the following critical parameters:

• Resistance Value: 50kΩ at 25°C (primary selection criterion)
• Package Type: Bead, Epoxy configuration
• Thermal Characteristics: B-value proximity and operating temperature range compatibility
• Regulatory Compliance: ROHS3 and REACH status alignment
• Mounting Configuration: Physical form factor and lead configuration

The substitute part TT7-50KC3-3 from TEWA Sensors LLC meets the core functional requirements of 50kΩ resistance and bead epoxy packaging. While operating temperature ranges and B-value specifications differ, the substitute maintains electrical equivalence for the primary resistance characteristic and thermal sensing function.

Parameter Comparison

Engineering Selection Recommendations

The TT7-50KC3-3 is an active product from TEWA Sensors LLC and serves as a functional equivalent for the obsolete PT503J2. Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The substitute maintains the 50kΩ resistance specification and bead epoxy package configuration. Applications operating within the TT7-50KC3-3 temperature range of -40°C to 125°C will experience compatible thermal response characteristics. For applications requiring the full -80°C to 150°C range of the original PT503J2, temperature range limitations of the substitute must be evaluated against specific system requirements.

Frequently Asked Questions (FAQ)

Q: Can TT7-50KC3-3 directly replace PT503J2 in all applications?

A: The TT7-50KC3-3 provides electrical equivalence for the 50kΩ resistance specification. However, the operating temperature range differs: TT7-50KC3-3 operates from -40°C to 125°C versus PT503J2's -80°C to 150°C. Applications requiring the full original temperature range must verify compatibility.

Q: What are the key differences in thermal characteristics?

A: The B25/50 value differs between components: PT503J2 specifies 3892K while TT7-50KC3-3 specifies 3950K. This represents a variance in thermal response curve. Applications with strict thermal calibration requirements should account for this difference.

Q: Are both components RoHS and REACH compliant?

A: Yes. Both PT503J2 and TT7-50KC3-3 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What is the significance of product status?

A: PT503J2 is classified as obsolete, indicating discontinued manufacturing. TT7-50KC3-3 is active, ensuring ongoing availability and supply chain continuity for new designs and production requirements.

Q: How do resistance tolerances compare?

A: PT503J2 specifies ±0.2°C tolerance while TT7-50KC3-3 specifies ±1% tolerance. The PT503J2 offers tighter tolerance control. Applications with precision resistance requirements should evaluate this specification difference.