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Product Detailed Parameters
- Description：ICL 40 OHM 20% 2A 18.42MM
- Series：ST
- Mfr：Littelfuse Inc.
- Package：Bulk
- R @ 25°C：40 Ohms
- Tolerance：±20%
- Current - Steady State Max：2:00 AM
- R @ Current：600 mOhms
- Diameter：0.725" (18.42mm)
- Lead Spacing：0.310" (7.87mm)
- Grade：-
- Qualification：-
- Approval Agency：-
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Overview
The ST40002B is a power thermistor designed for inrush current limiting applications. It features a nominal resistance of 40 ohms with a tolerance of 20%. The component is rated for a continuous current of 2 amperes and has a physical diameter of 18.42 millimeters. This device functions as a positive temperature coefficient (PTC) thermistor, providing protection against high initial currents in electronic circuits.
Feature Summary
- Provides effective inrush current limiting to protect sensitive circuit components
- Utilizes positive temperature coefficient characteristics for self-regulating resistance
- Designed for radial lead mounting on printed circuit boards
Applications
- Power supply input stages
- Transformer primary winding protection
- Motor drive circuits
Procurement Notes
The ST40002B is scheduled for obsolescence and will be discontinued by the manufacturer Littelfuse Inc. Procurement should account for end-of-life status, potential non-cancelable orders, and tariff implications if shipping to the United States. Verify final availability through authorized distributors before design finalization.
Selection Notes
Engineers must consider the discontinuation status when selecting this component. Alternative PTC inrush limiters from the same or other manufacturers should be evaluated for long-term supply chain stability. Ensure replacement parts match the required 40-ohm resistance and 2-ampere current ratings to maintain circuit performance.
Part Context
This component belongs to the category of power thermistors used for inrush current limiting. These devices are essential for managing transient currents during system startup. The ST40002B represents a specific radial lead variant within Littelfuse's broader portfolio of circuit protection solutions.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided documentation due to the component's obsolescence status. Designers should consult Littelfuse technical support or distributor catalogs for direct replacements that meet the 40-ohm and 2A specifications.
