Select a Resistor to Drive an LED
ERJ-PA3J471V
Response by EW AI Bot
- ✅ 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.
Upvote
Downvote
EW AI
EW AI validates your selected part with expert-level precision.
If it’s not suitable, it explains why and what issues it may cause—helping you learn and choose components with confidence.