USP12397 Equivalent & Substitute Parts

Part Overview

The USP12397 is an NTC thermistor temperature sensor manufactured by Littelfuse Inc., featuring a 10kΩ resistance at 25°C with a B25/85 value of 3435K. This component operates across a temperature range of -30°C to 90°C and is packaged as a free-hanging probe configuration. The USP12397 is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

USP12397

Littelfuse Inc.In Stock: 1161USP12397 Datasheet

Current PartRFQ

USP16673

Littelfuse Inc.In Stock: 1564USP16673 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the USP12397 is determined by matching the following critical electrical and mechanical parameters:

• Resistance value at 25°C: 10kΩ
• Resistance tolerance: ±1%
• B25/85 thermal coefficient: 3435K
• Operating temperature range: -30°C to 90°C
• Package configuration: Probe
• Series compatibility: USP

The USP16673 qualifies as a direct substitute based on identical electrical characteristics (10kΩ resistance, ±1% tolerance, 3435K B25/85 value) and matching operating temperature specifications. Both components maintain probe packaging and belong to the same USP series from Littelfuse Inc.

Parameter Comparison

Engineering Selection Recommendations

The USP16673 is the designated substitute for the obsolete USP12397. Both components maintain identical electrical specifications and thermal characteristics, ensuring functional equivalence in temperature sensing applications. The USP16673 carries active product status, providing supply continuity and ongoing manufacturer support. Both parts satisfy ROHS3 compliance requirements and maintain equivalent regulatory classifications under REACH and ECCN standards. Selection of the USP16673 eliminates obsolescence risk while preserving circuit performance and thermal response characteristics.

Frequently Asked Questions (FAQ)

Q: What makes USP16673 a suitable substitute for USP12397?

A: The USP16673 matches all critical electrical parameters: 10kΩ resistance at 25°C with ±1% tolerance, identical B25/85 thermal coefficient of 3435K, and matching operating temperature range of -30°C to 90°C. Both components use probe packaging and belong to the Littelfuse USP series.

Q: Does the difference in mounting type affect substitution?

A: The USP12397 specifies free-hanging mounting, while the USP16673 uses user-defined mounting. Both maintain probe package configuration. Mounting type differences do not affect electrical performance or thermal response in probe-based temperature sensing applications.

Q: Are there compliance differences between these parts?

A: Both components are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. Regulatory and environmental compliance requirements are equivalent.

Q: Why is USP12397 listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The USP16673 provides an active alternative with identical specifications, ensuring continued availability for replacement and new applications.

Q: Can packaging differences affect circuit integration?

A: Both parts use probe packaging. The packaging difference (bulk for USP16673 versus unspecified for USP12397) refers to supply format, not component form factor. Probe configuration remains consistent for both parts.