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Specifications
Type:
Wirewound Resistor
Resistance:
680mΩ
Power(Watts):
3W
Temperature Coefficient:
±75ppm/℃
Tolerance:
±5%
Operating Temperature:
-55℃~+200℃
Mfr. Part #:
W21-R68JI
Package:
Through Hole,D5.6xL12.7mm
Key Attributes
Model Number:
W21-R68JI
Product Description
Vitreous Enamelled Wirewound Resistors W20 Series
The W20 Series Vitreous Enamelled Wirewound Resistors are designed for harsh environments and offer high stability, reliability, and power dissipation for their size. They are IECQ-CECC approved and feature an impervious lead-free vitreous enamel coating, making them ideal for protection circuits. These resistors are Pb-free and comply with EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3).
Product Attributes
- Brand: TT Electronics (BI Technologies, IRC, Welwyn)
- Certifications: IECQ-CECC approved, CECC 40-201-002
- Material: Vitreous enamel coating, Copper clad steel wire (nickel plated and solder-coated) terminations
- Compliance: Pb-free, EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3)
- Construction: Ceramic substrate, interference fit end caps, wound resistive element
Technical Specifications
| Type | L max (mm) | D max (mm) | f min (mm) | d nom (mm) | Wt.nom (g) | Power Rating (W @ 25C) | Resistance Range (Ohms) | Tolerance (%) | TCR (C/ppm) |
|---|---|---|---|---|---|---|---|---|---|
| W21 | 12.7 | 5.6 | 22.75 | 0.8 | 1 | 1 | 1 to 100K | 1, 2, 5 | -55 to +200 / 200 |
| W22 | 22.0 | 8.0 | 23.1 | 0.8 | 2 | 2 | 1 to 100K | 1, 2, 5 | -55 to +200 / 200 |
| W23 | 38.0 | 8.0 | - | 0.8 | 3.5 | 3.5 | 1 to 100K | 1, 2, 5 | -55 to +200 / 200 |
| W24 | 53.5 | 8.0 | - | 0.8 | 5 | 5 | 1 to 100K | 1, 2, 5 | -55 to +200 / 200 |
Performance Data
| Test | Condition | R% (5) | R% (2) | R% (1) |
|---|---|---|---|---|
| Actual Performance Requirements | Maximum Typical Load at commercial rating: 1000 hrs at 25C | 3.5 | - | - |
| Load at CECC rating: 1000 hours at 25C | 5 | - | - | |
| Dry heat | 1000 hours at 200C | 5 | 2 | 1 |
| Shelf life | 12 months at room temperature | Not specified | Not specified | Not specified |
| Short term overload | - | 1 | 1.0 | 0.2 |
| Climatic | - | 5 | 0.5 | 0.2 |
| Climatic category | 55/200/56 | - | - | - |
| Long term damp heat | - | 5 | 0.05 | 0.02 |
| Temperature rapid change | - | 1 | 0.5 | 0.2 |
| Resistance to solder heat | - | 1 | 0.25 | 0.03 |
| Vibration and bump | - | 1 | 0.25 | 0.05 |
| Robustness | - | 1 | 0.4 | 0.05 |
Ordering Procedure
Example: W22-3K3JI (W22, 3.3 kilohms 5%, Pb-free)
| Component | Options |
|---|---|
| Type | W21, W22, W23, W24 |
| Value | E24 series, R = ohms, K = kilohms |
| Tolerance | F = 1%, G = 2%, J = 5% |
| Packing & Termination Finish | I = Standard packing & Pb-free |
For CECC released product, follow the MPN with text indicating the relevant release and style. Example: W22-3K3JI IECQ-CECC40201-002 KB
2403271644_TT-Electronics-W21-R68JI_C19305587.pdf
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