RUSB160 Equivalent & Substitute Parts

Part Overview

The RUSB160 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® series, designed for 16V, 1.6A applications with through-hole radial disc packaging. This component is classified as obsolete, making identification of compatible substitutes essential for ongoing system support and component procurement. The RUSB160 provides overcurrent protection through automatic resetting functionality without requiring manual intervention after fault clearance.

Substiute Parts

RUSB160

Littelfuse Inc.In Stock: 1025RUSB160 Datasheet

Current PartRFQ

RUSBF160

LittelfuseIn Stock: 1143RUSBF160 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RUSB160 is determined by strict equivalence across the following critical parameters:

Voltage rating must equal or exceed 16V maximum. Current hold (Ih) rating must match 1.6A maximum. Current trip (It) must equal 3.2A. Mounting configuration must remain through-hole radial disc. Lead spacing must maintain 0.199" (5.05mm) pitch for PCB compatibility. Package type must be radial disc format. Polymeric PTC resettable fuse technology must be maintained.

The RUSBF160 meets all substitution criteria as a direct equivalent, maintaining identical electrical ratings and mechanical form factor while offering improved product status and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The RUSBF160 is the direct substitute for the obsolete RUSB160. Both components share identical electrical characteristics and mechanical dimensions, ensuring drop-in compatibility in existing circuit designs. The RUSBF160 offers significant advantages: active product status ensures ongoing availability and manufacturing support, ROHS3 compliance meets current environmental regulations, and expanded operating temperature range (-40°C to 85°C) provides broader application flexibility. UL certification replaces the UR certification of the original part, maintaining regulatory approval across North American markets. The lower initial resistance specification (30 mOhms versus 300 mOhms) in the RUSBF160 represents an improvement in thermal performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can RUSBF160 be used as a direct replacement for RUSB160 in existing designs?

A: Yes. The RUSBF160 maintains identical voltage (16V), current hold (1.6A), current trip (3.2A), and mechanical form factor (radial disc, 0.199" lead spacing) as the RUSB160. PCB layout and circuit functionality remain unchanged.

Q: What is the significance of the product status change from Obsolete to Active?

A: Active status indicates the RUSBF160 is in current production with guaranteed availability. Obsolete status for the RUSB160 means manufacturing has ceased and existing inventory is limited. Transition to the active substitute ensures long-term component supply for new production and field replacements.

Q: How does the initial resistance difference (300 mOhms vs. 30 mOhms) affect circuit performance?

A: Initial resistance is measured before fault activation. The lower value in RUSBF160 results in reduced steady-state power dissipation during normal operation, improving thermal efficiency without affecting protection characteristics or trip thresholds.

Q: Are there compliance differences between RUSB160 and RUSBF160?

A: Yes. RUSBF160 is ROHS3 compliant, meeting current environmental directives for restricted substances. RUSB160 is non-compliant. RUSBF160 carries UL certification versus UR for the original part. Both maintain CSA and TUV approvals. For applications requiring RoHS compliance, RUSBF160 is the required choice.

Q: Does the expanded operating temperature range of RUSBF160 affect substitution suitability?

A: The RUSBF160 operating range (-40°C to 85°C) encompasses typical industrial and commercial applications. This expanded specification provides design margin and is fully compatible with applications originally designed for the RUSB160.

Q: What packaging format is supplied for RUSBF160?

A: RUSBF160 is supplied in bag packaging, suitable for both manual and automated assembly processes. This differs from the RUSB160 packaging designation but does not affect component functionality or PCB mounting.