Fibre Core Conformal Coated Wirewound Resistor - SPP Series
The SPP Series Fibre Core Conformal Coated Wirewound Resistors are designed for applications requiring reliable fusing capabilities, with UL1412 recognition. These resistors offer a wide range of resistance values and are available with high Temperature Coefficients (TCs) upon request. They are suitable for both weldable and solderable lead applications, providing versatility in assembly. The series is RoHS3 compliant for Pb-free parts.
Product Attributes
- Brand: TT Electronics (BI Technologies, IRC, Welwyn)
- Certifications: UL1412 recognised (UL number E234469)
- Compliance: EU Directive 2011/65/EU amended by (EU) 2015/863 (RoHS3) for Pb-free parts
- Construction: Fibre Core, Conformal Coated, Wirewound
- Marking: Five color bands (value, multiplier, tolerance, flameproof fusible band)
Technical Specifications
| IRC Type | Resistance - Std. Range | Tolerance - Std. | Power Rating | Load Life Stability | Max. Continuous Working Voltage | Min. Insulation Resistance | Min. Dielectric Withstanding Volts (RMS) | Ambient Temperature Range | Temperature Coefficient |
|---|---|---|---|---|---|---|---|---|---|
| SPP-1 | 0.1 to 1200 | 5% (E24), 10% (E12) | 1W @ 85C | 1 watt @ 85C 10% | PR | 10,000 Meg / 100 Meg | 600V | -65 to 160C | 600ppm/C (0.10 - 0.91) / 300ppm/C (1 - 1200) |
| SPP-2 | 1 to 470 | 5% (E24), 10% (E12) | 2W @ 85C | 2 watt @ 85C 10% | PR | 10,000 Meg / 100 Meg | 600V | -65 to 160C | 600ppm/C (0.10 - 0.91) / 300ppm/C (1 - 2400) |
| SPP-3 | 1 to 470 | 5% (E24), 10% (E12) | 3W @ 85C | 3 watt @ 85C 10% | 75V | 10,000 Meg / 100 Meg | 600V | -65 to 160C | 600ppm/C (0.10 - 0.91) / 300ppm/C (1 - 2400) |
Dimensions (Inches and (mm))
| IRC Type | A max. | B max. | C .002(0.05) |
|---|---|---|---|
| SPP-1 | 0.400(10.2) | 0.148(3.8) | 0.032(0.8) |
| SPP-2 | 0.570(14.5) | 0.170(4.3) | 0.032(0.8) |
| SPP-3 | 0.570(14.5) | 0.170(4.3) | 0.032(0.8) |
Environmental Data Characteristics
| Characteristic | Maximum Limits | Test Method EIA Specication |
|---|---|---|
| Thermal Shock | 5% | RS-344 |
| Low Temperature Operation | 5% | |
| Short Time Overload | 5% | |
| Commercial Short Time Overload | 5% | |
| Resistance to Solder Immersion | 3% | |
| Solderability | 95% minimum coverage | |
| Moisture Resistance | 5% | |
| Life Test | 5% |
Fusing Characteristics
Note: After fusing, the ohmic value is at least 100 times the initial value, provided initial power 25W (SPP1) or 40W (SPP2) is applied.
SPP1 Fusing Characteristic (Maximum & Typical Fusing Times)
SPP2 Fusing Characteristic (Maximum & Typical Fusing Times)
Pulse Energy Limit (single or low repetition rate, R <5%)
| Value (ohms) | Energy (J) |
|---|---|
| SPP1 | 1.2/50us |
| SPP2 | 1.2/50us |
Peak Voltage Limit (10 pulses at 30s intervals, R <5%)
| Value (ohms) | Voltage kV |
|---|---|
| SPP1 | 1.2/50us |
| SPP2 | 1.2/50us |
Taping Dimensions (inches (mm))
| Type | a max | b | c |
|---|---|---|---|
| SPP-1, SPP-2, SPP-3 | 0.41 (10.4) | 2.0620.062 (52.41.6) | 0.20.015 (5.10.4) |
Packaging
Resistors are supplied taped and reeled. Standard packing is tape & reel, 4000/reel.
Ordering Procedure Example
SPP1UL4700JLF (SPP1, UL recognised, 470 ohms 5%, Pb-free)
2403271650_TT-Electronics-SPP2UL2R20JLF_C19496512.pdf
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