SL10 4R004 Inrush Current Limiter - Equivalent & Substitute Parts

Part Overview

The SL10 4R004 is an inrush current limiter manufactured by Ametherm, designed to limit inrush current in power supply circuits and similar applications. This component features a 4 ohm resistance at 25°C with ±20% tolerance and supports a steady-state maximum current of 4 A. The part is housed in a 0.394" (10.00mm) diameter package with 0.248" (6.30mm) lead spacing. The SL10 4R004 maintains Active product status and is ROHS3 compliant with CSA and UR approvals. Finding equivalent or substitute parts may be necessary due to inventory constraints, supply chain considerations, or application-specific requirements for higher current ratings or different package dimensions.

Substiute Parts

SL10 4R004

AmethermIn Stock: 1254SL10 4R004 Datasheet

Current PartRFQ

B57211P0409M301

EPCOS - TDK ElectronicsIn Stock: 3966B57211P0409M301 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SL10 4R004 is determined by the following critical parameters:

• Resistance value: 4 Ohms ±20%
• Tolerance specification: ±20%
• Steady-state current rating: minimum 4 A
• Resistance at operating current: comparable performance
• RoHS compliance: ROHS3 Compliant
• Package diameter and lead spacing: mechanical fit considerations

The B57211P0409M301 qualifies as a substitute based on matching resistance value (4 Ohms ±20%), tolerance (±20%), and exceeding the steady-state current requirement (5 A vs. 4 A). The substitute maintains ROHS3 compliance and REACH unaffected status. Physical dimensions differ, with the substitute featuring a larger 0.512" (13.00mm) diameter and 0.295" (7.50mm) lead spacing, requiring verification of mechanical fit in the target application.

Parameter Comparison

Engineering Selection Recommendations

Both the SL10 4R004 and B57211P0409M301 maintain Active product status and satisfy ROHS3 compliance requirements. The B57211P0409M301 provides a higher steady-state current rating (5 A versus 4 A) and lower resistance at operating current (118 mOhms versus 140 mOhms), offering improved thermal performance in applications requiring sustained current operation. Selection between these parts depends on mechanical fit constraints, as the substitute features larger package dimensions. Both parts carry REACH unaffected status and equivalent regulatory compliance. The choice should be based on available board space and mechanical mounting requirements specific to the target application.

Frequently Asked Questions (FAQ)

Q: Can the B57211P0409M301 directly replace the SL10 4R004?

A: Electrical substitution is valid based on matching resistance (4 Ohms ±20%), tolerance (±20%), and exceeding current requirements (5 A vs. 4 A). Mechanical fit must be verified, as the substitute has a larger diameter (0.512" vs. 0.394") and wider lead spacing (0.295" vs. 0.248").

Q: What are the key electrical parameters that determine substitution compatibility?

A: The critical parameters are resistance value, tolerance specification, and steady-state current rating. Both parts match at 4 Ohms ±20%, with the substitute exceeding the current requirement. Resistance at operating current differs slightly but remains within acceptable performance margins.

Q: Are there compliance differences between these parts?

A: Both parts are ROHS3 compliant and REACH unaffected. The original part carries CSA and UR approvals, while the substitute does not list specific approval agencies. Compliance verification against your application standards is recommended.

Q: What should I consider when selecting between these parts?

A: Evaluate mechanical fit based on package diameter and lead spacing. Consider the substitute's improved current rating and lower operating resistance if thermal performance is a design factor. Verify compliance requirements specific to your application and end-use market.