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 — Correct value for 12V supply, 2V LED forward voltage, and 22mA desired current (
(12V-2V)/22mA ≈ 455Ω, use next standard value: 470Ω). - ✅ Tolerance: ±5% — Meets or exceeds requirement for LED applications.
- ✅ Power Rating: 0.333W (1/3W) — Meets the minimum required rating (≥0.33W).
Required power dissipation:P = I^2*R = (0.022A)^2*470Ω ≈ 0.227W. 0.333W provides safe margin for long-term reliability. - ✅ Mounting Type: 0603 Surface Mount — Satisfies the surface-mount criterion.
- ✅ Technology: Thick Film — Acceptable for this application.
- ✅ RoHS Compliance: ROHS3 Compliant (per DigiKey listing).
✅ Panasonic ERJ-PA3J471V is a fully suitable choice for your 12V LED current-limiting application.
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