RUE090 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RUE090 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 30V maximum voltage with 900 mA hold current. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The RUE090 functions as a thermal protection device in through-hole radial disc configuration, suitable for applications requiring automatic circuit protection with reset capability after fault conditions clear.

Substiute Parts

RUE090

Littelfuse Inc.In Stock: 1000RUE090 Datasheet

Current PartRFQ

30R090UU

LittelfuseIn Stock: 191230R090UU Datasheet

DirectRFQ

RUEF090

LittelfuseIn Stock: 4431RUEF090 Datasheet

DirectRFQ

0ZRB0090FF1C

Bel Fuse Inc.In Stock: 271540ZRB0090FF1C Datasheet

DirectRFQ

FRU090-30F

RFE/FuzetecIn Stock: 1553FRU090-30F Datasheet

DirectRFQ

MF-R090-0-9

Bourns Inc.In Stock: 3246MF-R090-0-9 Datasheet

DirectRFQ

PTR030V0090-BK

Eaton - Electronics DivisionIn Stock: 978PTR030V0090-BK Datasheet

DirectRFQ

PTR030V0090-BK1

Eaton - Electronics DivisionIn Stock: 722PTR030V0090-BK1 Datasheet

DirectRFQ

RS30-090

OptiFuseIn Stock: 1161RS30-090 Datasheet

DirectRFQ

PFRA.090.009

SCHURTER Inc.In Stock: 1161PFRA.090.009 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RUE090 is determined by strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

• Voltage rating: 30V maximum
• Hold current: 900 mA
• Trip current: 1.8 A
• Initial resistance: 70 mOhms minimum
• Post-trip resistance: 220 mOhms maximum
• Operating temperature: -40°C to 85°C
• Mounting: Through hole radial disc configuration
• Lead spacing tolerance: 0.197" to 0.201" (5.00mm to 5.10mm)

All substitute parts listed meet these core electrical specifications. Variations in maximum current rating (40 A vs. 100 A), physical dimensions, and regulatory certifications do not disqualify substitution when the primary protection parameters remain identical. Lead spacing variations within the specified tolerance range accommodate standard PCB hole patterns.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain electrical equivalence to the RUE090 across the critical protection parameters: 30V voltage rating, 900 mA hold current, 1.8 A trip current, and identical resistance characteristics. Selection among active alternatives should prioritize product status and regulatory compliance.

Littelfuse Alternatives: RUEF090 and 30R090UU are direct Littelfuse products with active status. RUEF090 maintains the original lead spacing of 0.199" and carries RoHS3 compliance with CQC, CSA, TUV, and UL certifications. 30R090UU offers RoHS3 compliance with cURus and TUV certifications and includes 1900 units in current inventory.

Cross-Manufacturer Options: Bel Fuse 0ZRB0090FF1C, Bourns MF-R090-0-9, Eaton PTR030V0090-BK/BK1, OptiFuse RS30-090, and SCHURTER PFRA.090.009 all meet electrical specifications with active product status and RoHS3 compliance. Bel Fuse 0ZRB0090FF1C includes AEC-Q200 automotive qualification. Lead spacing variations (0.197" to 0.201") fall within standard PCB tolerance ranges for radial through-hole components.

Inventory Availability: Highest stock levels are available for Bel Fuse 0ZRB0090FF1C (27,084 units), RUEF090 (4,385 units), and Bourns MF-R090-0-9 (3,210 units).

Frequently Asked Questions (FAQ)

Q: Can I substitute the RUE090 with any of these parts directly? A: Yes. All listed parts meet the electrical specifications that define the RUE090's protection function: 30V rating, 900 mA hold current, 1.8 A trip current, and identical resistance characteristics. Lead spacing variations (0.197" to 0.201") are within standard PCB hole pattern tolerances for radial through-hole mounting.

Q: What is the difference between the RUE090 and RUEF090? A: Both are Littelfuse polymeric PTC resettable fuses with identical electrical specifications. The primary difference is product status: RUE090 is obsolete, while RUEF090 is active. RUEF090 maintains the same 0.199" lead spacing and offers RoHS3 compliance with expanded certifications (CQC, CSA, TUV, UL).

Q: Are there dimensional differences I should consider? A: The SCHURTER PFRA.090.009 has larger physical dimensions (0.461" diameter vs. 0.291" for other parts) and greater height (0.657" vs. 0.480"). This part is not suitable for applications with space constraints matching the RUE090 footprint. All other substitutes maintain the same 0.291" x 0.118" disc dimensions.

Q: Which substitute offers the best regulatory coverage? A: RUEF090 carries the broadest certification set (CQC, CSA, TUV, UL) and includes RoHS3 compliance. Bel Fuse 0ZRB0090FF1C adds AEC-Q200 automotive qualification for applications requiring automotive-grade reliability.

Q: Does lead spacing affect PCB compatibility? A: Lead spacing variations of 0.197" to 0.201" (5.00mm to 5.10mm) are within standard manufacturing tolerances for radial through-hole components and accommodate typical PCB hole patterns. Verify your specific PCB design tolerances if spacing is critical.

Q: What is the difference between 40 A and 100 A maximum current ratings? A: The maximum current rating indicates the component's thermal limit under fault conditions. Both 40 A and 100 A ratings are compatible with the RUE090's 900 mA hold current specification. The higher rating provides additional thermal margin in high-current fault scenarios.

Q: Are all substitutes RoHS3 compliant? A: Most active substitutes are RoHS3 compliant. The Eaton PTR030V0090-BK and PTR030V0090-BK1 carry RoHS compliance (not specifically RoHS3). Verify compliance requirements for your specific application and regulatory jurisdiction.