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RUE900 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts
Part Overview
The RUE900 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 30V at 9A hold current with a 18A trip current. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing circuit protection applications. The RUE900 features a radial disc package suitable for through-hole mounting in protection circuits requiring automatic reset capability after fault conditions are cleared.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Max | 30V |
| Current - Hold (Ih) (Max) | 9 A |
| Current - Trip (It) | 18 A |
| Time to Trip | 20 s |
| Resistance - Initial (Ri) (Min) | 5 mOhms |
| Resistance - Post Trip (R1) (Max) | 20 mOhms |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Through Hole |
| Package / Case | Radial, Disc |
| Lead Spacing | 0.402" (10.20mm) |
Substitute Part Grouping Explanation
Substitution of the RUE900 is determined by strict equivalence across the following critical parameters: maximum voltage rating (30V), hold current (9A), trip current (18A), time to trip (20s), initial resistance (5 mOhms minimum), post-trip resistance (20 mOhms maximum), operating temperature range (-40°C to 85°C), through-hole mounting configuration, and radial disc package format. All identified substitute parts maintain these electrical and mechanical specifications, ensuring functional compatibility in the original circuit application. Lead spacing variations within 0.402" ±0.008" are acceptable for through-hole mounting compatibility.
Parameter Comparison
| Part Number | Manufacturer | Voltage (Max) | Ih (Max) | It | Ri (Min) | R1 (Max) | Time to Trip | Temp Range | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| RUE900 | Littelfuse Inc. | 30V | 9 A | 18 A | 5 mOhms | 20 mOhms | 20 s | -40°C ~ 85°C | Obsolete | RoHS non-compliant |
| RUEF900 | Littelfuse Inc. | 30V | 9 A | 18 A | 5 mOhms | 20 mOhms | 20 s | -40°C ~ 85°C | Active | ROHS3 Compliant |
| 30R900UH | Littelfuse Inc. | 30V | 9 A | 18 A | 5 mOhms | 20 mOhms | 20 s | -40°C ~ 85°C | Active | ROHS3 Compliant |
| 0ZRB0900FF1A | Bel Fuse Inc. | 30V | 9 A | 18 A | 5 mOhms | 20 mOhms | 20 s | -40°C ~ 85°C | Active | ROHS3 Compliant |
| FRU900-30F | RFE/Fuzetec | 30V | 9 A | 18 A | 5 mOhms | 20 mOhms | 20 s | -40°C ~ 85°C | Active | ROHS3 Compliant |
| MF-R900 | Bourns Inc. | 30V | 9 A | 18 A | 5 mOhms | 20 mOhms | 20 s | -40°C ~ 85°C | Active | ROHS3 Compliant |
| PTR030V0900-BK | Eaton - Electronics Division | 30V | 9 A | 18 A | 5 mOhms | 20 mOhms | 20 s | -40°C ~ 85°C | Active | RoHS Compliant |
| RS30-900 | OptiFuse | 30V | 9 A | 18 A | 5 mOhms | 20 mOhms | 20 s | -40°C ~ 85°C | Active | ROHS3 Compliant |
| PFRA.900 | SCHURTER Inc. | 30V | 9 A | 18 A | 5 mOhms | 20 mOhms | 20 s | -40°C ~ 85°C | Active | ROHS3 Compliant |
Engineering Selection Recommendations
All identified substitute parts maintain electrical and mechanical equivalence to the RUE900. Selection among active alternatives should prioritize parts with ROHS3 compliance status, which includes RUEF900, 30R900UH, 0ZRB0900FF1A, FRU900-30F, MF-R900, RS30-900, and PFRA.900. The PTR030V0900-BK offers RoHS compliance as an alternative. For applications requiring automotive-grade reliability, the 0ZRB0900FF1A carries AEC-Q200 rating. Littelfuse RUEF900 and 30R900UH represent direct manufacturer progression from the obsolete RUE900. Lead spacing and height variations are within acceptable tolerances for standard through-hole PCB mounting.
Frequently Asked Questions (FAQ)
Q: Can I directly replace RUE900 with any of these substitute parts? A: Yes. All listed parts maintain identical electrical specifications (30V, 9A hold, 18A trip) and radial disc through-hole package format. Physical dimensions vary slightly but remain compatible with standard through-hole mounting.
Q: What is the difference between RUEF900 and 30R900UH? A: Both are Littelfuse active alternatives with identical electrical ratings. RUEF900 is packaged in bags, while 30R900UH is supplied in bulk. Both carry ROHS3 compliance and equivalent certifications.
Q: Why is the RUE900 marked as obsolete? A: The RUE900 is no longer in active production. Littelfuse has transitioned to RUEF900 and 30R900UH as current production equivalents.
Q: Are there any lead spacing concerns when substituting? A: Lead spacing ranges from 0.394" to 0.402" across all alternatives. This variation is within acceptable tolerance for standard through-hole PCB designs. Verify PCB pad spacing before assembly.
Q: Which substitute offers the best compliance for new designs? A: RUEF900, 30R900UH, 0ZRB0900FF1A, FRU900-30F, MF-R900, RS30-900, and PFRA.900 all carry ROHS3 compliance. For automotive applications, 0ZRB0900FF1A includes AEC-Q200 qualification.
Q: Do all substitutes have the same approval agencies? A: All parts carry TUV certification. Additional certifications vary by manufacturer: CSA, UL, cURus, and cUL certifications are present across the substitute list. Verify specific certifications required for your application.
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