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WRF1JT100R Equivalent & Substitute Parts
Part Overview
The WRF1JT100R is a 100 Ohms ±5% 1W axial wirewound resistor manufactured by Stackpole Electronics Inc. This component features flame-proof and moisture-resistant construction with safety-rated design. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility while accommodating any changes in physical dimensions and power ratings.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Resistance | 100 Ohms |
| Tolerance | ±5% |
| Power Rating | 1W |
| Composition | Wirewound |
| Package Type | Axial |
| Features | Flame Proof, Moisture Resistant, Safety |
| Operating Temperature Range | -55°C ~ 200°C |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the WRF1JT100R is determined by the following critical parameters:
- Resistance value: 100 Ohms (exact match required)
- Tolerance: ±5% (exact match required)
- Composition: Wirewound (exact match required)
- Package: Axial (exact match required)
- Power rating: Equal to or greater than 1W
- Features: Flame Proof and Safety (minimum required)
- RoHS compliance: ROHS3 Compliant (minimum required)
Two substitute parts meet these criteria with variations in power rating, operating temperature range, and physical dimensions.
Parameter Comparison
| Parameter | WRF1JT100R (Main) | CB2JBR430 (Substitute) | FKN2WSJR-73-100R (Substitute) |
|---|---|---|---|
| Manufacturer | Stackpole Electronics Inc | Stackpole Electronics Inc | YAGEO |
| Resistance | 100 Ohms | 430 mOhms | 100 Ohms |
| Tolerance | ±5% | ±5% | ±5% |
| Power Rating | 1W | 2W | 2W |
| Composition | Wirewound | Wirewound | Wirewound |
| Package | Axial | Axial | Axial |
| Features | Flame Proof, Moisture Resistant, Safety | Flame Proof, Moisture Resistant, Safety | Flame Proof, Fusible, Safety |
| Operating Temperature | -55°C ~ 200°C | -55°C ~ 275°C | -40°C ~ 155°C |
| Product Status | Obsolete | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
FKN2WSJR-73-100R is the primary substitute for WRF1JT100R. Both components share identical resistance (100 Ohms) and tolerance (±5%), with the substitute offering increased power capacity (2W versus 1W). The FKN2WSJR-73-100R maintains ROHS3 compliance and active product status, ensuring long-term availability. Physical dimensions differ slightly (0.177" Dia x 0.453" L versus 0.197" Dia x 0.433" L), requiring verification of board layout compatibility.
CB2JBR430 is not suitable as a direct substitute due to resistance mismatch (430 mOhms versus 100 Ohms), despite sharing the same manufacturer and similar feature set.
Frequently Asked Questions (FAQ)
Q: Can FKN2WSJR-73-100R replace WRF1JT100R in all applications?
A: FKN2WSJR-73-100R matches the critical electrical parameters (100 Ohms, ±5% tolerance, wirewound axial construction) and exceeds the power requirement (2W versus 1W). Physical dimensions differ slightly; board layout and thermal management must be evaluated for your specific application.
Q: Why is CB2JBR430 listed as a substitute if the resistance values differ?
A: CB2JBR430 does not meet substitution criteria for this application due to resistance mismatch (430 mOhms versus 100 Ohms required). This part should not be used as a replacement for WRF1JT100R.
Q: What is the impact of the operating temperature range difference?
A: FKN2WSJR-73-100R operates from -40°C to 155°C, compared to WRF1JT100R's -55°C to 200°C range. Applications requiring operation below -40°C or above 155°C require thermal performance verification.
Q: Are there packaging differences between the main part and substitute?
A: Both components use axial packaging. Physical dimensions vary: WRF1JT100R measures 0.197" Dia x 0.433" L, while FKN2WSJR-73-100R measures 0.177" Dia x 0.453" L. Board layout compatibility must be confirmed.
Q: Is the substitute part RoHS compliant?
A: Yes, FKN2WSJR-73-100R is ROHS3 compliant, matching the compliance status of the original WRF1JT100R.
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