RGEF250-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RGEF250-2 is a polymeric PTC resettable fuse manufactured by Littelfuse in the PolySwitch® RGEF series. This through-hole radial disc component provides overcurrent protection with a 16V maximum voltage rating and 2.5A hold current specification. The device is actively produced and widely used in circuit protection applications requiring automatic reset functionality after fault conditions are cleared. Substitute parts are identified when identical electrical and mechanical parameters are maintained across the same product series and manufacturer specifications.

Substiute Parts

RGEF250-2

LittelfuseIn Stock: 2844RGEF250-2 Datasheet

Current PartRFQ

RGEF250-AP

Littelfuse Inc.In Stock: 1723RGEF250-AP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RGEF250-2 is determined by strict equivalence across the following critical parameters:

• Voltage rating (16V maximum)
• Current hold specification (2.5A maximum)
• Current trip threshold (4.7A)
• Resistance characteristics (initial and post-trip values)
• Operating temperature range (-40°C to 85°C)
• Mounting configuration (through-hole radial disc)
• Physical dimensions and lead spacing
• Series classification (PolySwitch® RGEF)
• Polymeric PTC type designation

Only parts matching all these parameters across the same manufacturer and series qualify as direct parametric equivalents. Packaging format (Cut Tape) does not restrict substitution eligibility when electrical and mechanical specifications are identical.

Parameter Comparison

Engineering Selection Recommendations

The RGEF250-AP is a direct parametric equivalent to the RGEF250-2. Both components are manufactured by Littelfuse, maintain identical electrical specifications, and carry the same regulatory certifications (CSA, TUV, UL). Both parts are ROHS3 compliant and actively produced. Selection between these parts may be based on inventory availability, lead time, or packaging format preference, as all technical parameters are equivalent. The RGEF250-2 currently has 2807 units in stock, while the RGEF250-AP has 1627 units available.

Frequently Asked Questions (FAQ)

Q: Can RGEF250-AP be used as a direct replacement for RGEF250-2?

A: Yes. Both parts are parametric equivalents with identical voltage ratings (16V), current hold specifications (2.5A), trip thresholds (4.7A), resistance characteristics, operating temperature ranges, physical dimensions, and regulatory certifications. They are interchangeable in circuit applications.

Q: Are there any differences in mechanical compatibility?

A: No. Both parts share identical mounting type (through-hole), package configuration (radial disc), physical dimensions (0.350" L x 0.118" W), height (0.504" seated), and lead spacing (0.199"). PCB layout and assembly procedures remain unchanged.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both RGEF250-2 and RGEF250-AP carry CSA, TUV, and UL approvals and are ROHS3 compliant.

Q: What determines substitution eligibility for polymeric PTC resettable fuses?

A: Substitution requires matching voltage rating, current hold and trip specifications, resistance values, operating temperature range, mounting type, package configuration, physical dimensions, and series classification. All these parameters must be identical between the main part and substitute.

Q: Is packaging format (Cut Tape) a factor in substitution?

A: No. Packaging format does not affect electrical or mechanical compatibility. Parts with identical specifications in different packaging formats are functionally equivalent.