5. Select a Resistor to Drive an LED
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ERJ-PA3J471V
| 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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- ✅ Resistance: 470Ω is correct for limiting current to approximately 21.3mA (well within the 22mA target for the red LED at 12V supply and 2V LED VF).
- ✅ Tolerance: ±5% meets the specification for current control accuracy.
- ✅ Power Rating: 0.333W (1/3W) is equal to the required minimum of 0.33W.
Calculated resistor dissipation: (12V-2V)^2 / 470Ω = 0.213W, so this part is safely within its rating with good margin for reliability. - ✅ Mounting Type: 0603 (1608 metric) SMD package is suitable for surface mount assembly as required.
- ✅ Technology: Thick Film, which is acceptable as per the specification.
- ✅ RoHS Compliance: ROHS3 Compliant (environmentally safe and meets directive).
Result: All requirements are met. The Panasonic ERJ-PA3J471V is fully suitable for this application.
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