RGEF700K Polymeric PTC Resettable Fuse - Equivalent & Substitute Parts

Part Overview

The RGEF700K is a polymeric PTC resettable fuse manufactured by Littelfuse Inc. in the PolySwitch® RGEF series. This component provides overcurrent protection with automatic reset capability in through-hole radial disc configuration. The part is active in production with 1073 units in current inventory. Substitute parts are identified based on matching electrical specifications, mechanical compatibility, and certification requirements for direct circuit board replacement.

Substiute Parts

RGEF700K

Littelfuse Inc.In Stock: 1089RGEF700K Datasheet

Current PartRFQ

RGEF700

LittelfuseIn Stock: 3104RGEF700 Datasheet

DirectRFQ

RGEF700-1

Littelfuse Inc.In Stock: 783RGEF700-1 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RGEF700K are qualified based on the following criteria:

Electrical Parameters (Critical for Substitution):

• Voltage rating: 16V maximum
• Hold current (Ih): 7 A maximum
• Trip current (It): 11.9 A
• Time to trip: 4.6 s
• Initial resistance (Ri): 7.7 mOhms minimum
• Post-trip resistance (R1): 20 mOhms maximum
• Operating temperature range: -40°C to 85°C

Mechanical Parameters (Required for Board Compatibility):

• Mounting type: Through hole
• Package configuration: Radial, disc
• Lead spacing: 0.199" (5.05mm)

Compliance Requirements:

• Certifications: CSA, TUV, UL
• RoHS status: ROHS3 compliant

All identified substitutes match these parameters exactly, ensuring functional and physical interchangeability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—RGEF700K, RGEF700, and RGEF700-1—are active production components from Littelfuse Inc. with identical electrical and mechanical specifications. Selection between these parts should be based on:

Availability: RGEF700 offers the highest current inventory at 3092 units, followed by RGEF700K at 1073 units and RGEF700-1 at 724 units.

Compliance: All parts carry CSA, TUV, and UL certifications and meet ROHS3 compliance requirements, ensuring regulatory acceptance in equivalent applications.

Physical Compatibility: Identical lead spacing (0.199" / 5.05mm), radial disc package configuration, and through-hole mounting ensure direct board-level substitution without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can RGEF700 or RGEF700-1 be used as direct replacements for RGEF700K?

A: Yes. All three parts share identical electrical parameters (16V, 7A hold current, 11.9A trip current, 4.6s trip time), mechanical configuration (radial disc, through-hole, 5.05mm lead spacing), and certifications (CSA, TUV, UL). They are functionally and physically interchangeable.

Q: What determines whether a substitute part is acceptable?

A: Substitution is valid when the part maintains the same voltage rating, hold current, trip current, trip time, initial and post-trip resistance values, operating temperature range, lead spacing, and package configuration. All identified substitutes meet these criteria.

Q: Are there differences in the physical dimensions between these parts?

A: The main dimensional difference is seated height: RGEF700K has a maximum seated height of 0.874" (22.20mm), while RGEF700 and RGEF700-1 have 0.776" (19.70mm). Length (0.421" / 10.70mm) and width (0.098" / 2.50mm) are identical across all three parts. This height variation should be evaluated for specific board clearance requirements.

Q: Do all parts meet the same regulatory standards?

A: Yes. RGEF700K, RGEF700, and RGEF700-1 all carry CSA, TUV, and UL approvals and are ROHS3 compliant, meeting equivalent regulatory requirements for circuit protection applications.

Q: Which part should be selected based on availability?

A: RGEF700 has the highest inventory level (3092 units), making it the preferred choice for high-volume procurement. RGEF700K and RGEF700-1 are available in smaller quantities (1073 and 724 units respectively).