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5. Select a Resistor to Drive an LED

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Sriharan
Sriharan
August 19, 2025
3521470RFT
Component
DigiKey Part NoA116024TR-ND
Mfr Part No3521470RFT
ManufacturerTE Connectivity Passive Product

RES SMD 470 OHM 1% 2W 2512

470 Ohms ±1% 2W Chip Resistor 2512 (6332 Metric) Automotive AEC-Q200, Moisture Resistant Thick Film

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EW

Response By EW AI

  • ✅ Resistance: 470Ω matches the calculated requirement for 22mA with a 12V supply and a 2V LED forward voltage.
    Calculation: (12V - 2V)/0.022A ≈ 455Ω; 470Ω is standard and will safely slightly underdrive the LED, increasing reliability.
  • ✅ Tolerance: 1% (better than required ±5%).
  • ✅ Power Rating: 2W (well above the required ≥0.33W).
    Actual dissipation: (0.022A)^2 × 470Ω ≈ 0.23W, so 2W is very safe.
  • ✅ Mounting Type: Surface Mount (2512 package), matches requirement.
  • ✅ Technology: Thick Film, meets requirement.
  • ✅ RoHS Compliance: ROHS3 Compliant.
All specified requirements are met or exceeded. This resistor is well suited for your LED current limiting application.
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