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5. Select a Resistor to Drive an LED

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KozmaSandor
KozmaSandor
November 7, 2025
CRCW1210470RJNEA
Component
DigiKey Part No541-470VTR-ND
Mfr Part NoCRCW1210470RJNEA
ManufacturerVishay Dale

RES SMD 470 OHM 5% 1/2W 1210

470 Ohms ±5% 0.5W, 1/2W Chip Resistor 1210 (3225 Metric) Automotive AEC-Q200 Thick Film

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EW

Response By EW AI

  • ✅ Resistance: 470Ω — Matches the calculated value for 22mA LED current at 12V supply (10V drop across resistor: 10V/0.022A ≈ 454.5Ω; 470Ω is the nearest standard value and within ±5%).
  • ✅ Tolerance: ±5% — Meets the requirement for ±5% or better.
  • ✅ Power Rating: 0.5W (1/2W) — Exceeds the minimum requirement of 0.33W. The resistor will dissipate P = I²R = (0.022A)2 × 470Ω ≈ 0.227W, so 0.5W is appropriate for long-term reliability and margin.
  • ✅ Mounting Type: Surface Mount (1210 package) — Meets the requirement for SMT assembly.
  • ✅ Technology: Thick Film — Acceptable for this application.
  • ✅ RoHS Compliance: ROHS3 Compliant — Environmentally suitable.
Result: All required specifications are met or exceeded. This resistor is a suitable and reliable choice for limiting current to your 22mA red LED at 12V.
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