5. Select a Resistor to Drive an LED
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P470BZTR-ND
| DigiKey Part No | P470BZTR-ND |
| Mfr Part No | ERJ-PA3J471V |
| Manufacturer | Panasonic Electronic Components |
RES SMD 470 OHM 5% 1/3W 0603
470 Ohms ±5% 0.333W, 1/3W Chip Resistor 0603 (1608 Metric) Automotive AEC-Q200, Pulse Withstanding Thick Film
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Resistor Selection Review
Resistance: 470Ω ✅
Tolerance: ±5% ✅
Power Rating: 0.333W (1/3W) ✅
Mounting Type: Surface Mount (0603) ✅
Technology: Thick Film ✅
RoHS Compliance: ROHS3 Compliant ✅
Summary:
✅ All required specifications are met:
Resistance: 470Ω ✅
Tolerance: ±5% ✅
Power Rating: 0.333W (1/3W) ✅
Mounting Type: Surface Mount (0603) ✅
Technology: Thick Film ✅
RoHS Compliance: ROHS3 Compliant ✅
Summary:
✅ All required specifications are met:
- 470Ω is the correct resistance for limiting 22mA from 12V to a 2V LED.
- ±5% tolerance is sufficient for LED current-limiting applications.
- Power dissipation: (12V-2V) × 22mA = 0.22W, which is well within the 0.333W rating, ensuring safe operation and good reliability.
- 0603 SMD package is suitable for modern PCB assembly.
- Thick film is robust and suitable for this application.
- RoHS3 compliant for environmental and safety requirements.
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